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YCQ 061-SF-2D

Library Service Literature

Product Section Unitary

Product Package Air Conditioner

Model YCD

Literature Type Service Facts

Sequence 2D

Date December 1998

File No. SV-UN-RT-YCD061-SF-2D 12/98

Supersedes New

Packaged Gas/Electric5 Ton Rooftop Unitswith Micro-Electronic Controls

YCD061C4LOBFYCD061C4LABFYCD061C4LBBFYCD061C4LCBFYCD061C4LFBF

YCD061C4LGBFYCD061C4HOBFYCD061C4HABFYCD061C4HBBFYCD061C4HCBFYCD061C4HFBFYCD061C4HGBFYCH061C4LOBFYCH061C4LBBFYCH061C4LFBFYCH061C4HOBFYCH061C4HBBFYCH061C4HFBF

Page G-1094-814

ServiceFactsCustomer Property: Containswiring and service informa-

tion. Please retain.

Models :

NOTICE

Warnings and Cautions appear at appropriate locations throughout this manual.Read these carefully

WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death orserious injury.

CAUTION: Indicates a potentially hazardous situation which, if not avoided, may result in minor ormoderate injury. It may also be used to alert against unsafe practices and where property-damage-only accidents could occur.

Since the manufacturer has a policy of continuous product improvement,it reserves the right to change design and specifications without notice.

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VOLTS/ PHASE/ HZ 460/ 3/ 60 VOLTS/ PHASE/ HZ 460/ 3/ 60

A.R.I. Ratings INDOOR FAN

Cooling Net Cap. BTUH (1) 58,000 Type/ No. Used FC Centrifugal/ 1Indoor Air Flow (CFM) 2000 Dia. x Width (in.) 12.6 x 9.5System Power (KW) 5.38 Drive DirectSEER (BTU per Watt) (2) 12 INDOOR FAN MOTOR

Heating Input/Output BTUH (3) Motor HP/ RPM/ Speed

Low Heat 90,000/ 73,000 Standard Motor 0.60/ 850/ 2

High Heat 120,000/ 97,000 Oversize Motor 0.75/ 1040/ 1

Temp. Rise - Min. F (L/ H) 25 Volts/ Ph/ Hz 460/ 1/ 60

Temp. Rise - Max. F (L/ H) 65 L.R. Amps/ F.L. Amps

Gas Type (4) Natural Standard Motor 5.6/ 2.5GAS PIPE SIZE (In.) 1/2" NPT Oversize Motor 6.4/ 3.1POWER CONNS OUTDOOR FAN

Min. Circuit Ampacity Type/ CFM Propeller/ 4150

Standard/ Oversize Motor 15.9/ 16.5 No. Used/ Diameter 1/ 24

Fuse Size - Max. (Amps) Drive/ No. Speeds Direct/ 1

Standard/ Oversize Motor 25 No. Motors/ HP/ RPM 1/ 0.25/ 850COMPRESSOR - No Used One Volts/ Ph/ Hz 460/ 1/ 60

Volts/ Ph/ HZ 460/ 3/ 60 L.R. Amps/ F.L. Amps 2.1/ 0.9

L.R. Amps 71 COMBUSTION FAN R.L. Amps 10 Type/ No. Used Centrifugal/ 1

OUTDOOR COIL TYPE Hi-Performance Type Drive Direct

Rows / F.P.I. 2/ 16 COMB FAN MOTOR

Face Area (Sq. Ft.) 12.09 Volts/ Ph/ Hz 208-230/ 1/ 60

Tube Size (In.) 0.375 Motor HP (L/ H) 1/20 (.05)INDOOR COILType Hi-Performance No. Speeds/ RPM 1/ 3350

Rows / F.P.I. 3/ 15 L.R. Amps 1.0

Face Area (Sq. Ft.) 7 FILTER Furnished

Tube Size (In.) 0.375 Type Throwaway

Refrigerant Control Device Short Orifice Filters Size (DF/ HZ) 16 x 25 x 1

Drain Conn. Size (In.) 3/4" PVC Quantity 3REFRIGERANT DIMENSIONS H x W x L

Charge (Lbs. of R-22) (5) 10.2 Uncrated (In.) 35 x 49-5/8 x 87-1/4WEIGHT (Approx. Lbs)

Shipping/ Net 902/ 713Footnotes:

1. Cooling Performance is rated at 95 F ambient, 80 F entering dry bulb, 67 F entering wet bulb and nominal cfm listed.

ARI capacity is net and includes the effect of fan motor heat.

Base models are certified in accordance with the Unitary Air-Conditioner Equipment certification program,

which is based on ARI Standard 210/240.

All models tested in accordance with ARI Standard 210/240.

2. Rated at ARI conditions and in accordance with DOE test procedures.

3. Heating performance limit settings and rating data were established and approved under laboratory test conditions using

American National Standards Institute standards. Ratings shown are for elevations up to 2000 feet.

4. Convertible to LP gas with orifice change.

5. Refrigerant charge shown is a nominal value; for a more precise value see the unit nameplate.

Product Specifications

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Downflow Unit

External Static Pressure (ESP) In Inches of Water Column

Standard Motor High Static Motor

Airflow High Speed Low Speed

CFM ESP BHP ESP BHP ESP BHP

1600 0.76 0.58 0.69 0.46 1.41 0.821700 0.71 0.59 0.63 0.48 1.34 0.86

1800 0.66 0.61 0.55 0.50 1.27 0.90

1900 0.60 0.63 0.47 0.52 1.21 0.93

2000 0.54 0.66 0.38 0.55 1.15 0.96

2100 0.47 0.69 0.28 0.59 1.06 1.01

2200 0.39 0.71 0.15 0.62 0.96 1.05

2300 0.30 0.73 0.84 1.09

2400 0.22 0.76 0.73 1.13

Horizontal Unit

External Static Pressure (ESP) In Inches of Water Column

Standard Motor High Static Motor

Airflow High Speed Low SpeedCFM ESP BHP ESP BHP ESP BHP

1600 0.78 0.58 0.71 0.46 1.42 0.83

1700 0.74 0.59 0.66 0.48 1.37 0.86

1800 0.69 0.62 0.60 0.50 1.30 0.90

1900 0.64 0.64 0.54 0.52 1.24 0.93

2000 0.58 0.66 0.45 0.56 1.17 0.97

2100 0.52 0.68 0.36 0.59 1.10 1.01

2200 0.44 0.70 0.24 0.63 1.04 1.05

2300 0.36 0.73 0.94 1.09

2400 0.26 0.76 0.84 1.13Note:

Data includes pressure drop due to filters and wet coils.

Performance Specifications

Evaporator Fan Performance

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Static Pressure Drops (Inches Water Column)Economizer Pressure Drop (Inches of W.C.)

100% Return Air 100% Outside Air

CFM Downflow/ Horizontal Downflow Horizontal

1000 0.01 0.05

1200 0.01 0.06

1300 0.01 0.06

1450 0.01 0.07

1600 0.02 0.08

2000 0.03 0.10

2400 0.06 0.12

*For Power Fresh Air, Full Return is zero.

Filter Pressure DropFilter Pressure Drop (Inches of W.C.)

Standard Filters Area (Sq. Ft.) Velocity (Ft. per Min.)

CFM Downflow/ Horizontal Downflow Horizontal Downflow Horizontal

1600 0.02 8.33 1922000 0.04 240

2400 0.06 288

Gas Heater Operating DataHeating Input Rate BTUH 90,000 120,000

Minimum Supply Gas Pressure Natural/ LP 3.5 w.c./ 8.0 w.c.

Manifold Gas Pressure (See Note 1) -0.2 w.c

Combustion Blower Suction Pressure

(With Gas Valve Closed) -2.1 to -3.1 w.c.

Minimum Flame Sensing Current (See Note 2) 5.0 Microamps D.C.

Normal Sensing Current Range 8.0 to 16.0 Microamps D.C.

Flue Gas Temperature Rise Above Ambient 350 to 450 F 350 to 525 FFlue Gas Content - %CO2 Natural/ LP 8.3 to 9.5/ 9.5 to 10.5

Minimum Supply Air Temperature Across

Heat Exchanger 40 F

Notes:

1. This Unit has a negative pressure gas valve. Never adjust to a positive pressure.

2. A voltage reading across pens (V+) & (V-) is equatable to the flame sensing

current. One volt equals one micro amp.

Performance Specifications

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Mechanical Data

Refrigerant Circuit Diagram

v CAUTION!CONTAINS REFRIGERANT!

SYSTEM CONTAINS OIL AND REFRIGERANT

UNDER HIGH PRESSURE. RECOVERREFRIGERANT TO RELIEVE PRESSUREBEFORE OPENING THE SYSTEM.

Failure to follow proper procedures can resultin personal illness or injury or severe equipment damage.

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Power Schematic

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Control Schematic

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Connections Diagram

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These units are equipped with a microelectronic control fea-ture which provides operating functions that are significantlydifferent than conventional units. It is referred to as the UnitControl Processor (UCP).

The UCP provides compressor anti short cycle timing func-tions through minimum Off and On timing to increase re-

liability, performance and to maximize unit efficiency.

Upon power initialization, the UCP performs self-diagnosticchecks to insure that all internal controls are functioning. Itchecks the configuration parameters against the compo-nents connected to the system. When units are equippedwith an optional economizer, the UCP drives the econo-mizer dampers toward the open position for 15 to 20 sec-onds then closes. The economizer is closed for approxi-mately 90 seconds to ensure proper damper calibration.

The LED located on the UCP module is turned On withinone second after power-up if all internal operations areokay.

Cooling without an EconomizerWhen the system switch is set to the Cool position and thezone temperature rises above the cooling setpointcontrolband, the UCP energizes the (K1) relay coil locatedon the UCP. When the K1 relay contacts close, the com-pressor contactor (CC1) coil is energized provided the lowpressure control (LPC1) is closed. When the CC1 contactsclose, compressor (CPR1) and the outdoor fan motor(ODM) start to maintain the zone temperature to within 2F of the sensor setpoint at the sensed location.

In addition to starting the compressor (CPR1) and outdoorfan motor (ODM) when the (CC1) contacts close, the com-pressor crankcase heater (CCH1) is de-energized throughredirection of current flow through the CC1 contacts.

When the cooling requirement is satisfied, the UCP cyclesthe compressor and outdoor fan motor Off. Current is al-lowed to flow through the crankcase heater (CCH1) afterthe CC1 contacts open provided the coil temperature limit(CTL) is closed.

Evaporator Fan OperationWhen the fan selection switch is set to the Auto position,the UCP energizes the (K3) relay coil approximately 1 sec-ond after energizing the compressor contactor coil (CC1) inthe cooling mode. Closing the K3 contacts on the UCP en-ergizes the indoor fan relay (F) coil to start the indoor fanmotor (IDM).

The UCP de-energizes the fan relay (F) approximately 60

seconds after the cooling requirement has be satisfied toenhance unit efficiency.

When the fan selection switch is set to the On position,the UCP keeps the indoor fan relay coil (F) energized forcontinuous fan motor operation.

When the unit is equipped with the optional fan failureswitch, wired between terminals J5-1 and J7-1 on the UCP,the UCP produces an analog output if the fan failure switch(FFS) does not open within two minutes after a request forfan operation. When the system is connected to a remotepanel, the SERVICE LED will be turned on when this fail-ure occurs.

Low Ambient OperationDuring low ambient operation, outside air temperature be-low 55 F, the UCP will cycle the compressor and outdoorfan motor Off for approximately 3 minutes after every 10minutes of accumulated compressor run time. The indoorfan motor (IDM) will continue to operate during this evapo-rator defrost cycle (EDC) and the compressor and outdoor

fan will return to normal operation once the defrost cyclehas terminated and the compressor Off time delay hasbeen satisfied.

Cooling with an EconomizerThe economizer is utilized to control the zone temperatureproviding the outside air conditions are suitable. Outside airis drawn into the unit through modulating dampers. Whencooling is required and economizing is possible, the UCPsends the cooling request to the unit economizer module(UEM) to open the economizer dampers by energizing theeconomizer actuator (ECA). The UCP tries to cool the zoneutilizing the economizer to slightly below the zone tempera-ture setpoint. If the supply air sensor (SAS) senses that thesupply air temperature is below 50 F, the dampers modu-

lated toward the closed position. If the zone temperaturecontinues to rise above the zone temperature setpointcontrolband and the economizer dampers are less than80% of full open, the UCP energizes the compressorcontactor (CC1).

During simultaneous economizing and mechanical cooling(compressor operation), the UEM continues to modulate theeconomizer dampers open/closed to keep the supply airtemperature in the 50 F to 55 F range with the compressor(CPR1) operating.

If economizing is not possible, the UEM drives the dampersto the minimum position setpoint when the indoor fan relay(F) is energized and allows mechanical cooling operation.

When the unit is equipped with the optional fan failureswitch, wired between terminals J5-3 and J5-4 on the UEM,the UCP will stop all cooling functions and produce an ana-log output if the active fan failure switch (AFF) does notopen within 40 seconds after a request for fan operation.When the system is connected to a remote panel, theSERVICE LED will flash when this failure occurs.

Economizer Set-UpThe required amount of ventilation air is set by adjusting theminimum position potentiometer located on the unit econo-mizer module (UEM).

Two of the three methods for determining the suitability ofthe outside air can be selected utilizing the DIP switches on

the UEM, as described below:

1. Ambient Temperature - controlling the economizing cycleby sensing the outside air dry bulb temperature. TheTable below lists the selectable dry bulb values by DIPswitch setting.

2. Reference Enthalpy - controlling the economizer cycle bysensing the outdoor air humidity. The Table below liststhe selectable enthalpy values by DIP switch setting. Ifthe outside air enthalpy value is less than the selectedvalue, the economizer is allowed to operate.

Sequence of Operation

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3. Comparative Enthalpy - By utilizing a humidity sensorand a temperature sensor in both the return air streamand the outdoor air stream, the unit control processor(UCP) will be able to establish which conditions are bestsuited for maintaining the zone temperature, i.e. indoorconditions or outdoor conditions. The DIP switches lo-cated on the UEM are non-functional when both the tem-

perature and humidity sensors are installed.

Selection Dry Bulb Enthalpy SW1 SW2

A 60 F 19 BTU/LB OFF OFF

B 55 F 22 BTU/LB OFF ONC 65 F 25 BTU/LB ON OFF

D ----- 28 BTU/LB ON ON

Heating OperationWhen the system switch is set to the Heat position and thezone temperature falls below the heating setpointcontrolband, a heat cycle is initiated when the K6 and K5relay coils on the UCP are energized. The normally open K6relay contacts closes to energize the heat relay (H) coil andpower the 24 VAC ignition control module (IGN) provided

TCO1 is closed. One set of double pole single throw K5relay contacts are utilized to control the indoor fan motor(IDM) speed. When the normally open K5 contacts close, theindoor fan motor (IDM) will operate in high speed. When thenormally open heat relay (H) contacts close, power issupplied to the ignition transformer (TNS2) powering the 115VAC section of the ignition control module (IGN) and startingthe combustion fan motor (CFM).

Ignition ModuleWith 115 VAC power supplied to the ignition module (IGN),the hot surface ignition probe (IP) is preheated for approxi-mately 30 to 45 seconds. The gas valve (GV) is energizedfor approximately 7 seconds for trial for ignition, to ignite theburner. Once the burner is ignited, the hot surface ignition

probe (IP) is de-energized by the ignition module (IGN) andfunctions as the flame sensing device.

If the burner fails to ignite, the ignition module will attempttwo retries. At the start of each ignition retry, the green LEDwill flash and the red LED will flash for five seconds beforelocking out. Anignition lockout can be reset by;

1. Opening and closing the main power disconnect switch,

2. By switching the Mode switch on the zone sensor toOFF and then to the desired position.

3. Allowing the ignition control module to reset automaticallyafter one hour. Refer to the Ignition Control Diagnosticssection for the LED diagnostic definitions.

When the fan selection switch is set to the Auto position,the UCP energizes the indoor fan relay (F) coil approxi-mately 30 second after initiating the heating cycle to startthe indoor fan motor (IDM).

The automatic reset high limit (TCO1), located in the bottomright corner of the burner compartment, protects against ab-

normally high leaving air temperatures. The automatic resetfan fail limit (TCO2), located in the upper middle section ofthe indoor fan board, protects against abnormally high heatbuildup which could occur because of extended cycling ofthe high limit (TCO1) or if the indoor fan motor (IDM) fails tooperate. Should TCO2 open, the UCP will de-energize theK6 relay and energize the indoor fan relay (F) in an attemptto start the fan motor. The UCP signals that a heat failurehas occurred by flashing the Heat LED on the zone sen-sor.

There are two LEDs located in the Ignition Control Module.The Table below lists the diagnostics and the status of theLEDs during the various operating states.

Ignition Control Module DiagnosticsLED Status

Diagnostics Green LED Red LED

1. Powered with no call for heat Off Off

2. Call for heat - no fault detected Flashing (1) Off

3. No Flame signal on try for ignition

or flame signal established and

los t prior to a lockout condition. Off Flashing (2)

4. Gas Valve miswired or flame Continuous Flashing (1)

signal present at a call for heat

5. Internal Fault - anytime. Off Continuous

Notes:

1. Flash at a 50% duty cycle.2.

At the start of each retry for ignition the red LED will flash

for five seconds along with the green LED

Sequence of Operation

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COOLING CYCLE PRESSURE CURVE

(Based on Indoor Airflow of 400 CFM / Ton)

FULL LOAD

100

150

200

250

300

350

400

450

500

45 50 55 60 65 70 75 80 85 90 95 100 105

SUCTION PRESSURE, PSIG

DISCHARGEPRESSURE,PSIG

86/72FIDDB/WB

80/67FIDD

B/WB

74/62FIDDB/WB

68/57FIDDB/WB

115 F OD Ambient

105 F OD Ambient

95 F OD Ambient

85 F OD Ambient

75 F OD Ambient

65 F OD Ambient

55 F OD Ambient

To Check Operating Pressures

1. Start the unit and allow the pressures to stabilize.

2. Measure the indoor DB/WB temperature entering

the indoor coil.

3. Measure the outdoor air dry bulb temperature

4. Take discharge and suction pressure readings.

5. Plot the outdoor dry bulb and the indoor DB/WB

temperature onto the chart.

6. At the point of intersection, read down for the suction

pressure and to the left for the discharge pressure.

Refrigeration Data

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SUPERHEAT CHARGING CHART

(Based on Indoor Airflow of 400 CFM / Ton)

FULL LOAD

0

10

20

30

40

50

35 45 55 65 75 85 95 105 115

OUTDOOR AMBIENT, DB F

COMPRESSOR

SUPERHEAT,DEGF

68 57 F ID DB/WB

74/62 F ID DB/WB

80/67 F ID DB/WB

86/72 F ID DB/WB

To Determine Required Superheat -

A) Plot the Outdoor Temperature onto the bottom axis of the curve.

B) Move vertically to the appropriate indoor DB/WB temp. (or interpolate temp).C) At the point of intersection, (OD & ID) read horizontally to the left for the required superheat.

1) REFRIGERANT CHARGE - ADD if the superheat is more than 5 F above curve value.

- REDUCE if the superheat is more than 5 F below curve value.

- OK if the superheat is within 5 F of curve value.

2) Do not add refrigerant if the superheat is less than 5 F.

3) Curves are based on 400 CFM/Ton Indoor Airflow @ 50% R.H.

4) System must be running at stablized conditions before measuring superheat.

Refrigeration Data

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American Standard Inc. 1998 Technical Literature Printed in USA