INSTALLATION INSTRUCTIONSfor 0637-0111 Economizer (CPECOMZR003A00)

063748GS1842ECMicroMetl

M M C 3035 N. Shadeland Ave., Suite 300 Indianapolis, IN 46226 MMC West 202 South 18th St. Sparks, NV 89431

Manufacturer reserves the right to discontinue, or change at any time, specifications, designs and prices without notice and without incurring obligations. Form No. IIK 582A-18-17 / 48/50-106SI Catalog no. 534-80264 Copyright MicroMetl Corporation 2005. All rights reserved.

MicroMetl's 0637 economizer is convertible-it will working in either a down discharge or horizontaldischarge application. Read these instructions completely and carefully before beginning installation.

1. Remove the side panel from the HVAC unit, ILL 1.Discard panel.

2. The bottom filter rack is built into the economizerwhile the top rack is installed separately.

3. On the top rack, bend the divider flange at 90o at thenotched corners, ILL. 2.

4. Raise the rack to the top of the coil and all the way tothe left side of the unit. Line up the prepunched hole infilter rack with the prepunched holes in coil's frame.Install (1) ½" long screw. (ILL. 3 & 4)

For Down Discharge(for Horizontal Application go to page 4)

htdiWretliF eziS/.ytQ

retlif"1 "1X"02X"21)2(

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Rack DetailILL. 3

Screw

Coil

Bend this flange at 90o

screw to divider with 1"screw

Top filter rack

EvaporatorCoil

Rack DetailILL. 4

Filter retainerclips

Prepunchedholes

ILL. 2

1 7/8"

22"

Side Panel shippedwith HVAC unit.Remove and discard

ILL. 1

Bend this flangeout at 90o

CompressorCompartment

DownDischarge

2

ILL.5

Replacement panel.Shipped witheconomizer

MicroMetleconomizer

Divider inHVAC unit

Filter door forhorizontalapplication only.

5. Screw through the prepunched hole in the 90o divider flange and into the HVAC unit's divider. Use 1" longscrew. Be sure the rack is snug to the top of the unit.

6. Install the replacement panel (shipped with the economizer) over the compressor compartment of theHVAC unit. Screw in place through the prepunched holes.

7. Slide the economizer into the return air chamber, ILL. 5. The rear flange on economizer must fit over theflange on the HVAC unit's base, see ILL. 6. Line up the mating hole in the economizer's bottom flangewith the hole in HVAC unit's base. Caulk each side of the bottom corners of the economizer.

8. Install the economizer cover panel over the economizer. Slide panel underneath top unit flange. Screwin place to the divider in the HVAC unit, base and top. Also, align the economizer to the cover panelusing the provided prepunched holes.

9. Run the economizer wiring harness through the grommet in the economizer cover panel. Follow theenclosed harness routing diagram. (See page 9.)

22 ½"

21 9/16"

21 9/16"

7 15/16"

Economizercover panel

Hole forwiring harness

DownDischarge

3

Coil

Economizer

ILL. 6

ILL. 7

TOP VIEW ILL. 8

Filter access door - Forhorizontal applicationonly. Do not remove fordown discharge.

Replacementpanel

Hole for economizerwiring harness

Rainhood

Filter accessdoor - hinged

10. Caulk the mating flanges of the rainhood andscrew to the economizer panel throughprepunched holes. The top flange of hood goesbehind the horizontal access door. (After adjust-ing the minimum position setting on the actuator,install the 21 3/16" x 17 1/8" aluminum filter in therain hood.)

11. Remove the cover panel shipped over thehorizontal return opening. Locate the filteraccess panel and gasket mating flanges. Screwthe hinge to the HVAC unit over the horizontalreturn opening. Adjust the closure handles for atight seal.

12. Install the provided filter access sticker on thehinged door.

13. Be sure the seams are all water tight. Seal asrequired.

14. Follow the wiring instructions enclosed.(see page 8)

Filter

Compressor

Economizer

ReplacementPanelEconomizer

Hood

0"

CoilFilter

Hinge

16 ¼"

1 1/8"

19 5/8"

This filter rack will notbe used in the downdischarge application.

ILL. 9

Door latchangle

Install filteraccess doorsticker

AluminumFilter

Horizontal supplyair cover panel.Shipped on HVACunit.

Caulk bottomcornersof economizereach side

*Barometric damperrelieves approximately25% of total systemair. Actual relief willvary depending on jobsite conditions.

*Barometric reliefdamper

HorizontalDischarge

4

For Horizontal Discharge(for Down Discharge Application go to page 1)

1. Remove the side panel from the HVAC unit,ILL. 1. Discard the panel.

2. NOTE:2" filters can not be used in a horizontalapplication.

Locate both the top filter rack and thebottom filter rack (used in horizontalapplications only).

Side Panel shippedwith HVAC unit.Remove and discard

Filter retainerclips

Prepunchedholes

ILL. 2

1 7/8"

22"

19 5/8"

1 1/8"

Top Rack

Bottom Rack

Bend this flangeout at 90º

3. Bend the tab on the top rack 90º at theperforations, ILL. 2.

CompressorCompartment

HorizontalDischarge

5

4. Install the bottom rack. Slide the rack to the farleft side (when facing the coil) of the HVACunit. Set the rack in front of the coil and screwthe rack to the coil frame through theprepunched holes. Maximum screwlength - ½".

5. Install the top rack with the tab bent at 90o atthe perforations. Raise the rack to the top ofthe coil and slide to the far left. Screw the rackto the coil frame through the prepunchedholes. Maximum screw length ½". Screwthrough the 90° bent flange and into unit'sdivider. Use 1" long screw.

Rack InstallationILL. 3

ILL. 5

Filter PlacementILL. 4

Bend flange at90º Screw todivider with 1"screw

Top filter rack

Bottom filter rack

EvaporatorCoil

Coil

Screw

Screw

Top Rack

BottomRack

Coil

Filter

Top Rack

BottomRack

HorizontalDischarge

6

6. Install the replacement panel over the compressor compartment. Screw in place through theprepunched holes.

7. Install the 5/8" gasketing on the bottom flanges of the economizer, ILL. 6.

8. Turn the economizer on its side as shown, ILL. 6. Slide the economizer into the cabinet and as farto the left as possible. The economizer will set against the left side of the HVAC unit. Caulk asrequired.

9. Screw through the bottom flange and through the economizer rear flange into the unit side.

10. Install the economizer cover panel over the opening and economizer. Panel slides underneath topflange of unit.

NOTE:The relief damper must be sealed shut for the horizontal discharge application.

Replacement panelShipped with economizer

Divider inHVAC unit

Screwinto base

Gasketing,3 Sides.

Economizercover panel

Screw

21 9/16"

7 15/16"

21 9/16"

22 ½"

ILL. 6

Screw thru prepunchedhole on economizerrear flange into theunit side Caulk these corners

after economizer isinstalled

HorizontalDischarge

7

Install filteraccess stickerhere

11. Route the economizer wiring harness throughthe grommet in the economizer panel. Followthe harness routing diagram. (see page 9)

12. Caulk the mating flanges on the rainhoodand screw to the economizer panel throughthe prepunched holes. Top flange of the hoodslips behind the filter door offset, ILL. 8. Anextended socket will be required for the leftside of the hood. After adjusting the mini-mum position setting on the actuator, installthe aluminum filter in the rainhood. Install theprovided filter access sticker on the horizon-tal filter door.

13. Follow the wiring instructions, see page 8.

ILL. 9

ILL. 8

ILL. 7

Filter Door

Offset

Hood

Economizerpanel

Filter Door

HVAC Unit

Replacementpanel

Grommet foreconomizerwiring

16 ¼"

11 3/8"

17 3/8"

The side hinged panel, andhorizontal cover panel will not

be used in the horizontalapplication.

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ECONOMIZER CONTROLS INSTALLATIONACCESSORY SLIDE-INECONOMIZER CONTROLINSTALLATION.1. Unpackage economizer.

2. Install accessory in unit perinstallation instructions provided.

3. Remove parts bag and instruc-tions from inside of accessory.

4. Install the discharge sensor in thesupply fan section. The sensormust protrude into the supply airstream.

5. Uncoil the wiring harness.Connect the two gray wires of theharness to the discharge sensorleads using the two wire nutsprovided.

6. Route the remainder of the wireharness through the unit to themain 24V splice box.

7. Mount thermostat downstairs perthe manufacturer’s instructions.Run proper wire from the thermo-stat to the unit control panel.

8. Review the MicroMetl wiringdiagram from this booklet .Connect unit , wire from thethermostat and harness from theeconomizer, together to match thediagram.

9. Follow start-up instructions below.

10. Adjust change over setpoint onlogic module.

11. Adjust minimum position set pointon logic module.

START-UP INSTRUCTIONS1. After unit is wired begin start-up procedures.2. Set thermostat functions to OFF. Set comfort levels to

minimum cool and minimum heat.3. Turn unit power on following manufacturer's start up

instructions.4. Turn thermostat fan function to ON. Unit indoor blower

should start and damper motor will drive to minimum ventposition. Minimum vent position should be adjusted onthe economizer logic for the proper percentage of outdoorair.

5. Switch the thermostat function from OFF to HEAT or AUTO.Bring the comfort setpoint for heat up to engage first stageheating. Follow manufacturer’s procedures to checkheating cycle. Bring the comfort setpoint for heat up toengage second stage heating if available. Check thisheating cycle also.

6. Under no circumstance should the economizer operate ina heating mode except for minium vent position.

7. Change the thermostat function from HEAT to COOL orleave in AUTO. Drop the comfort setpoint down to engagefirst stage call for cooling. The first stage cooling calltravels to the economizer. If the outdoor air is above the Athrough D setpoint, (see chart on next page), the firststage mechanical cooling is brought on. As the comfortsetpoint is reduced more there will be a second call forcooling which will bring on second stage mechanicalcooling if available.

8. In the cooling mode if the outdoor air is below the setpoint,the first stage call for cooling will open the economizer. Asthe comfort setpoint is reduced more there will be asecond call for cooling. This call will bring on the firststage mechanical cooling to back up the economizer.

9. Once all stages have been cycled, and all adjustmentsmade return thermostat to its proper operating mode,replace all doors, panels and hoods.

10. Leave a copy of these instructions with the customer.

A

Economizerrainhood

Damper actuatorand dry bulb orenthalpy

Supplyfan

Dischargesensor. Fieldinstall.

Main 24Vsplice box

Economizerharness

Compressor "A-A" Side View

EconomizerEconomizer harnessfrom actuator

Waterentrainmentfilter in hood

Economizer

Main 24Vsplice boxSupply

fan

Damperactuator

Damper logicmodule

Dry bulb orenthalpy(optional)

Filter

Economizerrainhood

Wiring harness. Factoryattached to economizeractuator. Factory run tosplice box.

Replacement panelshipped with econo-mizer

Dischargesensor. Fieldinstall.

A

Top ViewCoil

RoutingWiringHarness

11

System Description

These instructions are for fully modulating elec-tronically controlled economizers utilizing solidstate logic throughout. A standard single or

(recommended) two stage thermostat is all that isneeded to complete the control and economizersystem for the HVAC equipment.

Component Description

1. Damper actuator ... 9901-0083 provides 24v modulatingcontrol of economizer dampers, 25 in. lb. of torque.(Honeywell M7415A-1006)

2. Ball joint for linkage connection.

3. Discharge sensor ... 9901-0001 provides a signal (3000Ohms at 25°C or 77°F) to the actuator during free coolingor economizer mode. The signal opens the economizerdamper until the discharge temperature drops below 55°.At this time the signal causes the motor to modulate thedamper and mix outside air with return air to maintain a50° F. to 56° F. discharge temperature.

4. Wire nuts to connect discharge sensor to the harness.

5. Economizer logic ... 9901-0017 accepts input fromdischarge sensor and outside air sensor. Analyzes inputto control actuator modulation and economizer switching.Logic also houses minimum position adjustment andenthalpy or adjustable dry bulb adjustment. When usedwith optional differential sensors in the return air, the logicis capable of selecting the most economical air availablefor cooling. (Honeywell W7459A-1001)

6. Dry bulb...9901-0183 senses temperature of outside airand provides signal to the economizer logic. Opensoutside air at 60°, closes outside air at 70° (enthalpyoptional).

7. 5/8" grommet fits 5/8" hole that wires may pass through tokeep from chaffing.

8. Wire clamps to secure wires to base, dividers, etc..

9. Wire harness color coded and pre-wired to actuator andeconomizer logic... 9962-0087.

10. 1/2" hex head screws to secure wire clamps.

1

4

6

5

3

8

9

2

710

The purpose of an economizer is to use outdoor airfor cooling , whenever possible, to reduce compres-sor operation.

The economizer system initially responds to a signalfrom the cooling thermostat and functions as a truefirst stage for cooling, while providing maximum fueleconomy. The economizer is automatically lockedout during the heating mode and holds the outdoorair damper at the minimum position settings.

During the occupied period, on a call for cooling,when outdoor air temperature or enthalpy (optional)conditions are low, the economizer actuator willproportion to maintain between 50º F and 56º F atthermistor discharge sensor.

If the mixed or discharge temperature is above 56º F,actuator will open to admit additional outdoor air untilthe temperature returns to the 50º to 56º F range. Ifthe mixed or discharge air temperature is below 50ºF, the actuator will proportion closed, shutting theoutdoor air damper until the temperature returns tothe 50º to 56º F range. During the occupied period,the actuator will not close past the minimumposition.

MICROMETL INTEGRATED ECONOMIZERS

If the fully open actuator cannot satisfy the spacedemand, mechanical cooling is sequenced on.During the unoccupied period, the actuator willoverride minimum position setting and drive fullyclosed. On a loss of power, the actuator will springreturn fully closed.

When in heating operation, or when outdoor airtemperature or enthalpy (optional) conditions arehigh, economizer operation is locked out, andactuator is held at minimum position.

The staging relay is used when the first stagecompressors must provide mechanical coolingwhen assisting the economizer.

The staging relay can be omitted when the secondstage compressors can be used to assist theeconomizer with mechanical cooling.

The minimum position potentiometer keeps the outdoor airdamper from closing completely during system operationto provide ventilation.

1. Make sure the factory installed jumper is in placeacross terminals P and P1.

Differential Changeover Setting (optional)Differential enthalpy control (optional) utilizes two enthalpysensors connected to one W7459 Economizer Control.The enthalpy setpoint scale markings, located on the W7459,are A,B,C,D. Turn the setpoint potentiometer fully clockwisepast the D setting. The economizer will select the air withlower enthalpy for cooling; i.e., if outdoor air has lowerenthalpy than return air, then the outdoor air damper will beopened to bring in outdoor air for free cooling. The differentialenthalpy connects to SR and + on the W7959 logic.

Note: The C7650A adjustable dry bulb can also be used fordifferential change over. Only the temperature of the outdoorair and return air will be compared and the best selected forfree cooling.

CAUTIONExercise care when adjusting the changeoverset point and minimum position setting.EXCESSIVE FORCE MAY DAMAGE THECONTROLS

Enthalpy Changeover SetPointMinimum DamperPosition Setting

LED Lights up toindicate Outdoor Air isSuitable for FreeCooling

W7459 Logic Module

Enthalpy Changeover Setpoint (optional)Single enthalpy: The enthalpy changeover setpoints is set toreturn the outdoor air damper to minimum position when theenthalpy rises above its set point. The enthalpy setpointscale markings, located on W7459 are A,B,C,D as shownbelow. The factory-installed 620-ohm jumper must be inplace across terminals + and SR unless using differentialenthalpy.

Manufacturer reserves the right to discontinue, or change at any time, specifications, designs and prices without notice and without incurring obligations.Form No. IIK 582A-18-17 / 48/50-106SI Catalog no. 534-80264 Copyright MicroMetl Corporation 2005. All rights reserved.

M M C MMC West

MicroMetlCall Toll-Free: 1-800-662-4822Fax: 1-317-543-5986MicroMetl WestCall Toll-Free: 1-800-884-4662Fax: 1-775-356-9184

Minimum Position Adjustment

2. If remote control of dampers is desired, connect theremote potentiometer to P and P1 and turn it fullyclockwise before adjusting the minimum position.

3. Connect 24V AC to system and adjust the potentiom-eter on the face of the logic module with a screwdriverfor desired minimum position.

3035 N. Shadeland Ave., Suite 300 Indianapolis, IN 46226 202 South 18th St. Sparks, NV 89431