Occupied Unoccupied Unoccupied Override FRZ CT R TE DPT DA DA ASC CT FRZ TE DP HT DA DPT R SD ASC MECHANICAL CONTROL SEQUENCES - LEGEND Consulting Engineers GRIFFITH & VARY, INC. NONE JAJ M-1
ACCEPTABLE ALT. MANUFACTURERS: YORK/JCI, DAIKIN OR APPROVED EQUAL.
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STEAM OR WATER
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90 DEG. ELL. TOP
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TYPICAL BRANCH PIPE TAKE-OFF DETAIL
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TYPICAL FOR ALL WATER PIPING SYSTEMS
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WATER ONLY
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90 DEG. ELL. BOTTOM
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N.T.S.
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PITCH
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PITCH
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PITCH
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PIPE MAIN
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45 DEG. ELL. BOTTOM
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WATER ONLY
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45 DEG. ELL. TOP
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PIPE MAIN
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PITCH
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STEAM OR WATER
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%%UEND VIEW
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%%USIDE VIEW
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PIPE GUIDE DETAIL
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N.T.S.
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FOR PIPES W/ CENTERLINE LESS THAN 18" BELOW SLAB OR BEAM.
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STEEL ATTACHMENTS SHALL BE WELDED OR BOLTED.
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CONCRETE ATTACHMENTS SHALL BE HILTI OR APPROVED EQUAL.
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%%UNOTES:
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WELDED TO PIPE
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PLATE TO BE TWO
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PIPE DIAMETERS LONG
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STRUCTURE
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CONCRETE OR BLDG.
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STEEL GUIDE RIBS
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WELDED THRUOUT
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1/2" THICK STEEL PLATE
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INSULATION AS SPECIFIED
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PIPE
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RIGID INSULATION
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SHEETMETAL SLEEVE OVER
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CONSTRUCTION IN AN
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SECURE TO BUILDING
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PIPE GUIDE SLEEVE
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APPROVED MANNER
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3.
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2.
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1.
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CONCRETE ATTACHMENTS SHALL BE HILTI OR APPROVED EQUAL
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FOR PIPES W/ CENTERLINE LESS THAN 18" BELOW SLAB OR BEAM
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%%UNOTES:
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N.T.S.
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PIPE ANCHOR DETAIL
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STEEL ATTACHMENTS SHALL BE WELDED OR BOLTED
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SECURE TO BUILDING
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CONSTRUCTION IN AN
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PIPE
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INSULATION
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APPROVED MANNER
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PIPE DIAMETERS LONG
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PLATE TO BE TWO
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CONCRETE OR BLDG.
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STRUCTURE
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WELDED THRUOUT
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1/2" THICK STEEL PLATE
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1.
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3.
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2.
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OVER 3'-0" LONG WITH
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2"X2"X3/16" VERTICAL
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BRACE HANGER RODS
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ANGLE BRACE WELD 1"
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AT 24" SPACING
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OR INSERT
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ANCHOR BOLT
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TYPICAL SEISMIC BRACING FOR PIPE DETAIL
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ANGLE CLIP (DOUBLE)
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1/2
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3/8"
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3"X3"X1/4
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3", 4"
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2 1/2"X2 1/2" 16 GA.
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3/4
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2-3/4
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2-5/8
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3/4"
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1/2"
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5/8"
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5"X3"X1/2
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2-5"X3"X1/2
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2-5"X3"X1/2
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10"
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5", 6"
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8"
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3"X3" 12 GA.
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2 1/2"X2 1/2" 16 GA.
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3"X3" 12 GA.
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N.T.S.
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* 1 5/8 X 1 5/8 X 12 GAGE CHANNEL MAY BE USED.
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PIPE SLEEVE
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OVER BOLT
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INSULATION
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3/8
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ANGLE
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BOLT TO
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3/8"
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CLIP
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3"X3"X1/4
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ANGLE
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2 1/2"
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SIZE
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PIPE
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* ANGLE BRACE
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2"X2" 16 GA.
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PIPE
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SLOPE 1/1
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TRANSVERSE
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ANGLE BRACE
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LONGITUDINAL
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ANGLE BRACE
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12 GA. CLIP
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BOLT WITH
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LOCK WASHER
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ANCHOR BOLT
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%%UNOTE:
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6" AND LARGER USE DUAL ROD PIPE ROLL.
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ADJUSTABLE YOKE PIPE ROLL SHALL BE USED ON 4" AND 5" PIPING. ON ALL PIPING
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HANGERS TO THE STRUCTURE.
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PIPE SIZE AS INDICATED IN THE SPECIFICATIONS.
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PROVIDE INSULATION SHIELD OR PIPE SADDLE BASED ON THE PIPING SYSTEM AND
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REFER TO "TYPICAL METHOD OF SECURING HANGER RODS DETAIL" FOR ATTACHING
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PIPE ROLL TYPE PIPE HANGER
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N.T.S.
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INSTALLATION DETAIL
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HANGER ROD SCHEDULE
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PIPE SIZE
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12"
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10"
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5"
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6"
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8"
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4"
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PIPE SADDLE
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(SEE NOTE 3)
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PIPE ROLL
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DUAL ROD
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PIPE SIZE
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(SEE NOTE 2)
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MAX. ALLOWABLE SPACING
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HANGER ROD SPACING
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ROD SIZE
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10'
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10'
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10'
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10'
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10'
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12"
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10"
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5"
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6"
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8"
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7/8" DIA.
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7/8" DIA.
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7/8" DIA.
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5/8" DIA.
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3/4" DIA.
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4"
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5/8" DIA.
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10'
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SUPPORT NUT
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AND WASHER
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AND WASHER
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HIGH DENSITY
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PIPE
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INSULATION 12" LONG
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INSULATION SHIELD,
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PIPE ROLL (SEE NOTE 3)
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INSULATION
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12" LONG (SEE NOTE 2)
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ADJUSTABLE YOKE
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LOCKING NUT
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(SEE NOTE 1)
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HANGER ROD
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3.
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2.
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1.
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TEMPERATURE CONTROL CONTRACTOR
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EXPANSION TANK
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CONDENSATE PUMP
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ENTERING AIR TEMP. DEGREES F.
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DRY BULB TEMP. DEGREES F.
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GENERAL CONTRACTOR
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ACCESS DOOR
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ELECTRICAL CONTRACTOR
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CLEAN OUT
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ACCESS PANEL
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ENTERING WATER TEMP. DEGREES F.
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CUBIC FEET PER MINUTE
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GALLONS PER MINUTE
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GPM
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GC
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EWT
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ET
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EC
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EAT
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DB
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CP
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CO
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ATC
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CFM
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AP
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AD
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WET BULB TEMP. DEGREES F.
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VARIABLE FREQUENCY DRIVE
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PRESSURE DROP (FEET OF WATER)
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WB
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VFD
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PD
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LEAVING AIR TEMP. DEGREES F.
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LEAVING WATER TEMP. DEGREES F.
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CONDITIONING CONTRACTOR
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HEATING, VENTILATING & AIR
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PUMP
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MAXIMUM
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OUTSIDE AIR
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PLUMBING CONTRACTOR
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MINIMUM
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P
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OA
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PC
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LWT
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MIN
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MAX
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LAT
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HVAC
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ABBREVIATIONS
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PIPING
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DIRECTION OF FLOW
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PITCH DOWN IN DIRECTION OF ARROW
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HOT WATER RETURN
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HOT WATER SUPPLY
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HWS
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HWR
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EXPANSION COMPENSATOR
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TOP CONNECTION 45 OR 90 DEGREES
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BOTTOM CONNECTION 45 OR 90 DEGREES
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CONCENTRIC REDUCER
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CAPPED PIPE
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ECCENTRIC REDUCER
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SIDE CONNECTION
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PIPE TURN TOWARDS
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PIPE TURN AWAY
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UNION
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MANUAL AIR ELIMINATOR
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GATE VALVE W/ HOSE BIBB END
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FLOW MEASURING DEVICE
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AUTOMATIC AIR ELIMINATOR
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"Y" STRAINER W/ BLOW DOWN, H.W. SYSTEMS
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2-WAY CONTROL VALVE
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FD
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BALL VALVE
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PIPE GUIDE
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PIPE ANCHOR
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BALANCING VALVE
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"Y" STRAINER
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BUTTERFLY VALVE
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GATE VALVE
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VALVES
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CHWR
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CHILLED WATER RETURN
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CHWS
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CHILLED WATER SUPPLY
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ABOVE FINISHED FLOOR
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AFF
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COMBINATION BALANCING SHUT-OFF
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ABOVE FINISHED GRADE
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AFG
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STATIC PRESSURE SENSOR
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REVERSE ACTING THERMOSTAT
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SP
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T
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R
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TEMPERATURE CONTROLLER
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REMOTE SET POINT SPACE
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THERMOSTAT - MOUNT 48" A.F.F.
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SP
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T
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EQUIPMENT DESIGNATION
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GENERAL
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SENSOR THERMOSTAT - MOUNT 48" A.F.F.
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S
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AIR SEPARATOR
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AS
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AIR COOLED CHILLER
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ACC
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: Supply fan will run continuously. Outdoor air damper modulates (in conjunction with the return air damper) to maintain the minimum fresh air CFM set point. On a call for cooling: Economizer control shall use outside air for cooling upon sensing that ambient enthalpy meets the space cooling requirements. The outside air damper shall open 100%, the return air damper shall close fully and the exhaust fan shall run on high speed. On sensing that the ambient air is not appropriate to meet the cooling requirements, the chilled water control valve shall modulate as required to meet the space cooling set point.
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: During cooling season unit will be off. : When override button on thermostat is activated, unit shall enter occupied mode for 2 hours (adj.). If outdoor air is less then 40°F, heating coil valve opens 100% and face and bypass dampers modulates to maintain unoccupied heating discharge temperature set point of 80°F. If outdoor air is greater then 40°F, face & bypass dampers position for full flow across the heating coil and heating coil valve modulates to maintain unoccupied heating discharge temperature set point.
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SEQUENCE OF OPERATION
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EXISTING UNIT VENTILATORS (TYPICAL FOR 29)
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HWR/CHWR
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HWS/CHWS
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Hi
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Lo
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O.A.
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N.C.
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C
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HW
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S.A.
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N.C.
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N.O.
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N.O.
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TO BMS
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T
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R.A.
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1. The existing BMS is a Alerton Controls system. The existing BMS is a Alerton Controls system. 2. The Automatic Temperature Control Contractor shall modify the existing unit The Automatic Temperature Control Contractor shall modify the existing unit ventilator sequence of operation to incorporate the following cooling sequence. The existing heating sequence of operation shall remain in affect and un-modified.
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Existing controls shown for reference only.
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1
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NOTE:
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KEYED NOTE:
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1
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1
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1
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1
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1
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1
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1
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1
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EXIST. CONTROL
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VALVE.
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Hi
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Low
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T
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T
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DIFFERENTIAL PRESSURE SWITCH SET @ 1"WC
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SPLIT CORE CURRENT SENSOR
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FREEZESTAT
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INDUCT TEMPERATURE SENSOR
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BLANK STAINLESS STEEL WALL PLATE
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THERMISTOR SENSOR.
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USER ADJUSTABLE THERMOSTAT
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2-WAY CONTROL VALVE
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=
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=
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=
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=
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=
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=
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=
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VFD
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Hi
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Lo
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IN DUCT COMBINATION HUMIDITY/
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=
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SMOKE DETECTOR. INSTALLED BY
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=
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RELAY, SPDT
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=
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DAMPER ACTUATOR
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=
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DIFFERENTIAL PRESSURE TRANSDUCER
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=
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VARIABLE FREQUENCY DRIVE
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=
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TEMPERATURE SENSOR
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MECHANICAL CONTRACTOR, FURNISHED AND
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WIRED BY ELECTRICAL CONTRACTOR
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T
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REVERSE ACTING THERMOSTAT
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=
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R
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APPLICATION SPECIFIC CONTROLLER
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=
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FURNISHED BY ATC
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AUTOMATIC TEMPERATURE CONTROLS
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=
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BUILDING MANAGEMENT SYSTEM
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=
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ATC
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BMS
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68
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MCA
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MOCP
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206.5
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225
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2
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CHILLER SHALL BE FURNISHED WITH UNIT MOUNTED DISCONNECT AND SERVICE OUTLET.
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2
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SOUND PRESS. dB(A)@30'
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Keyplan
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Scale:
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Job No.:
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Drawn By:
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Date:
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Drawing Number:
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Drawing Name:
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North Arrow
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January 31, 2019
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1GV-223
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Notes:
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12 Kendrick Road
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Wareham, MA 02571
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508-295-0050 (T)
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508-295-0003 (F)
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www.griffithandvary.com
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Town of Arlington, Massachusetts
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DALLIN ELEMENTARY SCHOOL CHILLER PROJECT
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MECHANICAL
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LEGEND, DETAILS
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AND SCHEDULES
Sequence of Operation
Air-Cooled Chiller
Consulting EngineersGRIFFITH & VARY, INC.
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UP
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UP
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CORRIDOR
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175
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TEACHER PLANNING
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142
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CUST.
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OFFICE
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176
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EMERGENCY ELEC.
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141
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ELECTRICAL
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139
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MECHANICAL
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138
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STAIR # 2-1
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192
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6"
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HWR
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CHWR
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CHWS
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6"
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6"
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6"
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6"
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1-1/4"
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6"
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4"
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D
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C
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B
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A
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1
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2
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2.1
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3
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3.1
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3.3
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CONCRETE PAD BY
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MECHANICAL CONTRACTOR
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COORDINATE PAD REQUIREMENTS
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WITH CHILLER MANUFACTURER.
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REFER TO PAD DETAIL (THIS DWG).
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AIR COOLED CHILLER MOUNTED ON
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6" HIGH CONCRETE PAD.
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ACC
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1
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EXISTING VFD-1 TO REMAIN.
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EXISTING VFD-2 TO REMAIN.
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EXISTING P-1 TO REMAIN.
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EXISTING P-2 TO REMAIN.
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EXISTING B-1 TO REMAIN.
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EXISTING B-2 TO REMAIN.
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EXISTING B-3 TO REMAIN.
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EXISTING UH-1 TO REMAIN.
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4"
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4"
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6"
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NEW 6" CHWS & CHWR DN.
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INTO EXISTING PIT. MECH. CONT'R
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SHALL MODIFY GRATE TO ACCOMMODATE
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NEW PIPING.
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CONNECT NEW 6" CHWS &
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CHWR TO EXISTING VALVED
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TAKE-OFFS.
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EXISTING 6" CHWR
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& CHWS
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6"
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MECHANICAL CONTRACTOR SHALL
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EXCAVATE AREA TO INSTALL NEW
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PRE-INSULATED PIPING IN THIS
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AREA. AND SHALL PROPERLY
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BACKFILL, COVER AND GRADE
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AREA AFTER INSTALLATION AND
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PRESSURE TESTING OF PIPING
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NEW 6" CHWR & CHWS SHALL
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PASS THROUGH EXISTING 10" DIA.
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UNDERGROUND CONDUIT.
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REFER TO CHILLED WATER
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FLOW DIAGRAM FOR CHILLED
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WATER PIPING WATER PIPING
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AT CHILLER. (THIS DWG.)
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MECHANICAL CONTRACTOR
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SHALL FURNISHED AND
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INSTALL NEW 8' HIGH
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CHAIN LINK FENCE WITH
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GATE TO PROTECT CHILLER.
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MECHANICAL CONTRACTOR SHALL
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VERIFY SERVICE CLEARANCE
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REQUIREMENTS WITH CHILLER
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MANUFACTURER PRIOR TO
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INSTALLATION OF FENCE.
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TYPICAL FOR ALL SIDES.
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ELECTRICAL CONTRACTOR SHALL
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CONFIRM EXACT LOCATION OF
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INTEGRAL DISCONNECT SWITCH
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IN FIELD.
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UNDERGROUND PIPING
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RIC-WIL "TERA-GARD"
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INTEGRAL SERVICE
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RECEPTACLE
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PROVIDE 4#4/0+1#4G
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- 2-1/2"C, 36" BELOW
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FINISHED GRADE.
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EXISTING 1200 AMP, 277/480 VOLT, THREE
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PHASE FOUR WIRE SWITCHBOARD AS MANUFACTURED
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BY G.E. PROVIDE NEW 225/3 CIRCUIT BREAKER IN
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EXISTING SWITCHBOARD TO MATCH EXISTING, FOR
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FEEDING AIR COOLED CHILLER ACC-1.
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WP
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PRESSURE GAUGE
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W/ 1/4" BALL VALVE (TYP.)
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THERMOMETER
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FLEX. CONNECTION
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BUTTERFLY VALVE (TYP.)
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2" DRAIN OFF
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VALVE W/CAP
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& CHAIN
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HIGH VENT 1/4" BALL
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VALVE W/PLUGGED END
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ACC
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1
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4"
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4"
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EXIST. EXPANSION TANKS
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4"
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4"
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4"
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SYSTEM PUMPS
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EXIST. HEATING-COOLING
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GV
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4"
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GV
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4"
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TO SYSTEM
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1"
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1"
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4" SUCTION HEADER
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4"
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1"
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1"
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1
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1"
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/
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2
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1" BLOW
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EXIST. AIR SEPARATOR
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DOWN
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4"
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2
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/
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1"
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1
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PITCH UP
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4"
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AV
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1"
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4"
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2"
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2"
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2"
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CIRCUIT SETTER (TYP)
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ATFL
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ATFL
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EXIST. BOILERS
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6" CONCRETE PAD BY
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MECHANICAL CONTRACTOR
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GROUND
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FROM SYSTEM
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2" DRAIN VALVES
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W/ CAPS & CHAINS.
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EXISTING 4" CHWR CROSS
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CONNECTION.
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EXISTING VALVE OPEN
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FOR HEATING, CLOSE
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FOR COOLING.
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EXISTING VALVES CLOSE
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FOR HEATING, OPEN
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FOR COOLING.
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2" DRAIN OFF VALVE
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W/CAP & CHAIN.
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EXISTING VALVE. OPEN FOR
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HEATING, CLOSE FOR COOLING.
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EXISTING VALVE. CLOSE FOR HEATING,
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OPEN FOR COOLING.
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EXISTING VALVE. OPEN FOR
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HEATING, CLOSE FOR COOLING.
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EXISTING
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DRAIN DN.
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PIT
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PRE-INSULATED PIPING
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RIC-WIL "TERA-GARD"
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PRE-INSULATED PIPING
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RIC-WIL "TERA-GARD"
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1. The chiller plant shall be controlled by a networked DDC system. Functions shall include The chiller plant shall be controlled by a networked DDC system. Functions shall include chiller plant shall be controlled by a networked DDC system. Functions shall include chiller plant shall be controlled by a networked DDC system. Functions shall include plant shall be controlled by a networked DDC system. Functions shall include plant shall be controlled by a networked DDC system. Functions shall include shall be controlled by a networked DDC system. Functions shall include shall be controlled by a networked DDC system. Functions shall include be controlled by a networked DDC system. Functions shall include be controlled by a networked DDC system. Functions shall include controlled by a networked DDC system. Functions shall include controlled by a networked DDC system. Functions shall include by a networked DDC system. Functions shall include by a networked DDC system. Functions shall include a networked DDC system. Functions shall include a networked DDC system. Functions shall include networked DDC system. Functions shall include networked DDC system. Functions shall include DDC system. Functions shall include DDC system. Functions shall include system. Functions shall include system. Functions shall include Functions shall include Functions shall include shall include shall include include include chiller sequencing, chilled water pump speed control and monitoring of all sensors. 2. All set points given in written sequence(s) of operation shall be field adjustable and All set points given in written sequence(s) of operation shall be field adjustable and set points given in written sequence(s) of operation shall be field adjustable and set points given in written sequence(s) of operation shall be field adjustable and points given in written sequence(s) of operation shall be field adjustable and points given in written sequence(s) of operation shall be field adjustable and given in written sequence(s) of operation shall be field adjustable and given in written sequence(s) of operation shall be field adjustable and in written sequence(s) of operation shall be field adjustable and in written sequence(s) of operation shall be field adjustable and written sequence(s) of operation shall be field adjustable and written sequence(s) of operation shall be field adjustable and sequence(s) of operation shall be field adjustable and sequence(s) of operation shall be field adjustable and of operation shall be field adjustable and of operation shall be field adjustable and operation shall be field adjustable and operation shall be field adjustable and shall be field adjustable and shall be field adjustable and be field adjustable and be field adjustable and field adjustable and field adjustable and adjustable and adjustable and and and subject to software reset. 3. Local chiller control panel provided by the chiller manufacturer shall control all operating Local chiller control panel provided by the chiller manufacturer shall control all operating chiller control panel provided by the chiller manufacturer shall control all operating chiller control panel provided by the chiller manufacturer shall control all operating control panel provided by the chiller manufacturer shall control all operating control panel provided by the chiller manufacturer shall control all operating panel provided by the chiller manufacturer shall control all operating panel provided by the chiller manufacturer shall control all operating provided by the chiller manufacturer shall control all operating provided by the chiller manufacturer shall control all operating by the chiller manufacturer shall control all operating by the chiller manufacturer shall control all operating the chiller manufacturer shall control all operating the chiller manufacturer shall control all operating chiller manufacturer shall control all operating chiller manufacturer shall control all operating manufacturer shall control all operating manufacturer shall control all operating shall control all operating shall control all operating control all operating control all operating all operating all operating operating operating functions associated with starting, stopping and unloading of the chiller. All safety and associated with starting, stopping and unloading of the chiller. All safety and associated with starting, stopping and unloading of the chiller. All safety and with starting, stopping and unloading of the chiller. All safety and with starting, stopping and unloading of the chiller. All safety and starting, stopping and unloading of the chiller. All safety and starting, stopping and unloading of the chiller. All safety and stopping and unloading of the chiller. All safety and stopping and unloading of the chiller. All safety and and unloading of the chiller. All safety and and unloading of the chiller. All safety and unloading of the chiller. All safety and unloading of the chiller. All safety and of the chiller. All safety and of the chiller. All safety and the chiller. All safety and the chiller. All safety and chiller. All safety and chiller. All safety and All safety and All safety and All safety and safety and safety and and and high/low limits shall be interlocked within the local chiller control panels. 4. Communication between BMS and chiller shall be via BACnet interface to the chillers' digital Communication between BMS and chiller shall be via BACnet interface to the chillers' digital between BMS and chiller shall be via BACnet interface to the chillers' digital between BMS and chiller shall be via BACnet interface to the chillers' digital BMS and chiller shall be via BACnet interface to the chillers' digital BMS and chiller shall be via BACnet interface to the chillers' digital and chiller shall be via BACnet interface to the chillers' digital and chiller shall be via BACnet interface to the chillers' digital chiller shall be via BACnet interface to the chillers' digital chiller shall be via BACnet interface to the chillers' digital shall be via BACnet interface to the chillers' digital shall be via BACnet interface to the chillers' digital be via BACnet interface to the chillers' digital be via BACnet interface to the chillers' digital via BACnet interface to the chillers' digital via BACnet interface to the chillers' digital BACnet interface to the chillers' digital BACnet interface to the chillers' digital interface to the chillers' digital interface to the chillers' digital to the chillers' digital to the chillers' digital the chillers' digital the chillers' digital chillers' digital chillers' digital digital digital control panels. Chiller shall be brought on line via a signal from the DDC system in panels. Chiller shall be brought on line via a signal from the DDC system in panels. Chiller shall be brought on line via a signal from the DDC system in Chiller shall be brought on line via a signal from the DDC system in Chiller shall be brought on line via a signal from the DDC system in Chiller shall be brought on line via a signal from the DDC system in shall be brought on line via a signal from the DDC system in shall be brought on line via a signal from the DDC system in be brought on line via a signal from the DDC system in be brought on line via a signal from the DDC system in brought on line via a signal from the DDC system in brought on line via a signal from the DDC system in on line via a signal from the DDC system in on line via a signal from the DDC system in line via a signal from the DDC system in line via a signal from the DDC system in via a signal from the DDC system in via a signal from the DDC system in a signal from the DDC system in a signal from the DDC system in signal from the DDC system in signal from the DDC system in from the DDC system in from the DDC system in the DDC system in the DDC system in DDC system in DDC system in system in system in in in addition, chilled water set point and demand limit levels shall be controlled by the DDC chilled water set point and demand limit levels shall be controlled by the DDC chilled water set point and demand limit levels shall be controlled by the DDC water set point and demand limit levels shall be controlled by the DDC water set point and demand limit levels shall be controlled by the DDC set point and demand limit levels shall be controlled by the DDC set point and demand limit levels shall be controlled by the DDC point and demand limit levels shall be controlled by the DDC point and demand limit levels shall be controlled by the DDC and demand limit levels shall be controlled by the DDC and demand limit levels shall be controlled by the DDC demand limit levels shall be controlled by the DDC demand limit levels shall be controlled by the DDC limit levels shall be controlled by the DDC limit levels shall be controlled by the DDC levels shall be controlled by the DDC levels shall be controlled by the DDC shall be controlled by the DDC shall be controlled by the DDC be controlled by the DDC be controlled by the DDC controlled by the DDC controlled by the DDC by the DDC by the DDC the DDC the DDC DDC DDC system. 5. The DDC system shall enable chilled water plant operation whenever outdoor ambient The DDC system shall enable chilled water plant operation whenever outdoor ambient DDC system shall enable chilled water plant operation whenever outdoor ambient DDC system shall enable chilled water plant operation whenever outdoor ambient system shall enable chilled water plant operation whenever outdoor ambient system shall enable chilled water plant operation whenever outdoor ambient shall enable chilled water plant operation whenever outdoor ambient shall enable chilled water plant operation whenever outdoor ambient enable chilled water plant operation whenever outdoor ambient enable chilled water plant operation whenever outdoor ambient chilled water plant operation whenever outdoor ambient chilled water plant operation whenever outdoor ambient water plant operation whenever outdoor ambient water plant operation whenever outdoor ambient plant operation whenever outdoor ambient plant operation whenever outdoor ambient operation whenever outdoor ambient operation whenever outdoor ambient whenever outdoor ambient whenever outdoor ambient outdoor ambient outdoor ambient ambient ambient temperature is above 65ºF (adj.) and a requirement for chilled water exists from the air is above 65ºF (adj.) and a requirement for chilled water exists from the air is above 65ºF (adj.) and a requirement for chilled water exists from the air above 65ºF (adj.) and a requirement for chilled water exists from the air above 65ºF (adj.) and a requirement for chilled water exists from the air 65ºF (adj.) and a requirement for chilled water exists from the air 65ºF (adj.) and a requirement for chilled water exists from the air (adj.) and a requirement for chilled water exists from the air (adj.) and a requirement for chilled water exists from the air and a requirement for chilled water exists from the air and a requirement for chilled water exists from the air a requirement for chilled water exists from the air a requirement for chilled water exists from the air requirement for chilled water exists from the air requirement for chilled water exists from the air for chilled water exists from the air for chilled water exists from the air chilled water exists from the air chilled water exists from the air water exists from the air water exists from the air exists from the air exists from the air from the air from the air the air the air air air handling units. 6. The DDC system shall continuously monitor chilled water demand and enable and stage The DDC system shall continuously monitor chilled water demand and enable and stage DDC system shall continuously monitor chilled water demand and enable and stage DDC system shall continuously monitor chilled water demand and enable and stage system shall continuously monitor chilled water demand and enable and stage system shall continuously monitor chilled water demand and enable and stage shall continuously monitor chilled water demand and enable and stage shall continuously monitor chilled water demand and enable and stage continuously monitor chilled water demand and enable and stage continuously monitor chilled water demand and enable and stage monitor chilled water demand and enable and stage monitor chilled water demand and enable and stage chilled water demand and enable and stage chilled water demand and enable and stage water demand and enable and stage water demand and enable and stage demand and enable and stage demand and enable and stage and enable and stage and enable and stage enable and stage enable and stage and stage and stage stage stage chiller capacity as needed. 7. The DDC system shall be capable of resetting chilled water supply temperature via operator The DDC system shall be capable of resetting chilled water supply temperature via operator DDC system shall be capable of resetting chilled water supply temperature via operator DDC system shall be capable of resetting chilled water supply temperature via operator system shall be capable of resetting chilled water supply temperature via operator system shall be capable of resetting chilled water supply temperature via operator shall be capable of resetting chilled water supply temperature via operator shall be capable of resetting chilled water supply temperature via operator be capable of resetting chilled water supply temperature via operator be capable of resetting chilled water supply temperature via operator capable of resetting chilled water supply temperature via operator capable of resetting chilled water supply temperature via operator of resetting chilled water supply temperature via operator of resetting chilled water supply temperature via operator resetting chilled water supply temperature via operator resetting chilled water supply temperature via operator chilled water supply temperature via operator chilled water supply temperature via operator water supply temperature via operator water supply temperature via operator supply temperature via operator supply temperature via operator temperature via operator temperature via operator via operator via operator operator operator command from the system front end. Normal chiller water supply temperature shall be from the system front end. Normal chiller water supply temperature shall be from the system front end. Normal chiller water supply temperature shall be the system front end. Normal chiller water supply temperature shall be the system front end. Normal chiller water supply temperature shall be system front end. Normal chiller water supply temperature shall be system front end. Normal chiller water supply temperature shall be front end. Normal chiller water supply temperature shall be front end. Normal chiller water supply temperature shall be end. Normal chiller water supply temperature shall be end. Normal chiller water supply temperature shall be Normal chiller water supply temperature shall be Normal chiller water supply temperature shall be Normal chiller water supply temperature shall be chiller water supply temperature shall be chiller water supply temperature shall be water supply temperature shall be water supply temperature shall be supply temperature shall be supply temperature shall be temperature shall be temperature shall be shall be shall be be be 44ºF.
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a. When the chiller is brought online, its 2-way control valve shall modulate open. When the chiller is brought online, its 2-way control valve shall modulate open. b. The chilled water pump shall start and ramp up to 100% speed via its associated The chilled water pump shall start and ramp up to 100% speed via its associated variable frequency drive. c. By-pass control valve shall modulate open as necessary to maintain 100% design By-pass control valve shall modulate open as necessary to maintain 100% design flow rate through the chiller as sensed by flow meter. Refer to "Minimum Evaporator Control" below. d. Chillers chilled water D/P switch must prove "ON" to enable chiller. Chillers chilled water D/P switch must prove "ON" to enable chiller. e. If any of the status points fail to prove, an alarm shall be issued to the If any of the status points fail to prove, an alarm shall be issued to the operator's workstation. f. If the above status points all prove, the chiller shall be commanded to start. If the above status points all prove, the chiller shall be commanded to start. g. The chiller shall operate under control of its packaged control panel. The chiller shall operate under control of its packaged control panel. h. After the chiller has started, and the leaving chilled water temperature has After the chiller has started, and the leaving chilled water temperature has reached setpoint and is stable, the chilled water pump speed control shall switch to differential pressure control (See below). i. At the same time that the chilled water pump control switches to differential At the same time that the chilled water pump control switches to differential pressure control, the control of by-pass valve shall switch to minimum evaporator flow control (See below).
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a. Chiller Operation Chiller Operation 1) After setpoint is achieved and chilled water temperature is stable, the by-pass After setpoint is achieved and chilled water temperature is stable, the by-pass valve shall modulate to maintain minimum chilled water flow through the evaporator of the lead chiller, as verified by chiller manufacturer. The flow rate shall be measured by the flow meter. 2) On a drop below minimum flow setpoint, the by-pass valve shall modulate open. On a drop below minimum flow setpoint, the by-pass valve shall modulate open. 3) If the by-pass valve reaches 100% open position and the flow rate remains If the by-pass valve reaches 100% open position and the flow rate remains below setpoint, differential pressure setpoints shall be reset to their initial settings (See "Differential Pressure Control" below). 4) On start up of the chiller, the setpoint for the evaporator flow shall be 100% of On start up of the chiller, the setpoint for the evaporator flow shall be 100% of design flow for that chiller.
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a. Differential pressure sensors located at the ends of the chilled water mains shall be Differential pressure sensors located at the ends of the chilled water mains shall be the basis chilled water pump control. b. The differential pressure sensor shall have a distinct set point to be determined during The differential pressure sensor shall have a distinct set point to be determined during testing and balancing and confirmed during the commissioning phase of the project (Initially 10 psi). c. The chilled water pump speed shall be modulated via its associated variable frequency The chilled water pump speed shall be modulated via its associated variable frequency drive to maintain the sensor (As defined above) at its setpoint.
