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15

Final System Checks

15. 

Check to see if all supply and return air grilles are 

adjusted and the air distribution system is balanced 

for the best compromise between heating and 

cooling.

16. Check for air leaks in the ductwork.  See Sections 

on Air Flow Adjustments.

17. Make sure the unit is free of “rattles”, and the tubing 

in the unit is free from excessive vibration. Also 

make sure tubes or lines are not rubbing against 

each other or sheet metal surfaces or edges. If so, 

correct the trouble.

18. 

Set the thermostat at the appropriate setting for 

cooling and heating or automatic changeover for 

normal use.

19. Be sure the Owner is instructed on the unit 

operation, filter, servicing, correct thermostat 

operation, etc.

Refrigeration Performance Check

Check that compressor RLA corresponds to values shown 

in Appendix B.  RLA draw can be much lower than values 

listed at low load conditions and low ambient condensing 

temperatures. Values in Appendix B can slightly exceed 

at high load conditions and high ambient condensing 

temperatures.

HEAT PUMP OPERATION

Cooling Cycle

When the heat pump is in the cooling cycle, it operates 

exactly as a Summer Air Conditioner unit. In this mode, 

all the charts and data for service that apply to summer 

air conditioning apply to the heat pump. Most apply on 

the heating cycle except the “condenser” becomes the 

“evaporator”, “evaporator” becomes “condenser”, “cooling” 

becomes “heating”.

Heating Cycle

The heat pump switches from cooling cycle by redirecting 

refrigerant flow through the refrigerant circuit external to 

the compressor. This is accomplished by the reversing 

valve. Hot discharge vapor from the compressor is directed 

to the indoor coil (evaporator on the cooling cycle) where 

the heat is removed, and the vapor condenses to liquid. 

It then goes through the expansion device to the outdoor 

coil (condenser on the cooling cycle) where the liquid is 

evaporated, and the vapor goes to the compressor. 

The following figures show a schematic of a heat pump on 

the cooling cycle and the heating cycle. The heat pump 

is equipped with thermal expansion valves for the indoor 

and outdoor coils. It is also provided with a defrost control 

system.

Heating

When the heat pump is on the heating cycle, the outdoor 

coil is functioning as an evaporator. The temperature 

of the refrigerant in the outdoor coil must be below the 

temperature of the outdoor air in order to extract heat from 

the air. Thus, the greater the difference in the outdoor 

temperature and the outdoor coil temperature, the greater 

the heating capacity of the heat pump. This phenomenon 

is a characteristic of a heat pump. It is a good practice to 

provide supplementary heat for all heat pump installations 

in areas where the temperature drops below 45° F. It is 

also a good practice to provide sufficient supplementary 

heat to handle the entire heating requirement should 

there be a component failure of the heat pump, such as a 

compressor, or refrigerant leak, etc. 

Since the temperature of the refrigerant in the outdoor 

coil on the heating cycle is generally below freezing point, 

frost forms on the surfaces of the outdoor coil under 

certain weather conditions of temperature and relative 

humidity. Therefore, it is necessary to reverse the flow of 

the refrigerant to provide hot gas in the outdoor coil to melt 

the frost accumulation. This is accomplished by reversing 

the heat pump to the cooling cycle. At the same time, the 

outdoor fan stops to hasten the temperature rise of the 

outdoor coil and lessen the time required for defrosting. 

The indoor blower continues to run and the supplementary 

heaters are energized.

Defrost Control

During operation the Defrost signal to the circuit board 

is controlled by a temperature sensor, which is clamped 

Summary of Contents for DRC036

Page 1: ...pecified in this manual only licensed personnel should servise the equipment Improper installation adjustment servicing or repair of the equipment specified in this manual or attempting to install adj...

Page 2: ...ce CAUTION Sheet metal parts screws clips and similar items inherently have sharp edges and it is necessary that the installer and service personnel exercise caution WARNING Do not connect to or use a...

Page 3: ...ld also where applicable follow information presented in accepted industry guides such as the ASHRAE Handbooks The manufacturer assumes no responsibility for equipment installed in violation of any co...

Page 4: ...Installations Only To avoid possible property damage or personal injury the roof must have sufficient structural strength to carry the weight of the unit s and snow or water loads as required by local...

Page 5: ...ntenance and proper unit operation A clearance of 48 is recommended on all sides of the unit to facilitate possible parts replacement to allow service access and to insure proper ventilation and conde...

Page 6: ...struts mounted beneath unit base frame before setting unit on roof curb These struts are intended to protect unit base frame from fork lift damage Removal is accomplished by extracting the sheet meta...

Page 7: ...uit ampacity but less than or equal to the maximum overcurrent protection device DO NOT EXCEED THE MAXIMUM OVERCURRENT DEVICE SIZE SHOWN ON UNIT DATA PLATE All line voltage connections must be made th...

Page 8: ...ols used by the service mechanic NOTE Refer to local codes for requirements These outlets can also be factory installed Units installed on Roof Tops Main power and low voltage wiring may enter the uni...

Page 9: ...nsions are shown in the roof curb installation manual If desired supply and return duct connections to the unit may be made with flexible connections to reduce possible unit operating sound transmissi...

Page 10: ...and install new filters Contractor Responsibility The installing contractor must be certain that All supply and return air ductwork is in place properly sealed and corresponds with installation instr...

Page 11: ...ce it is established that supply voltage will be maintained within the utilization range under all system conditions check and calculate if an unbalanced condition exists between phases Calculate perc...

Page 12: ...ng stage 1 operation Do not move wires YL and PU to the same taps Move WHITE WH wire from TB1 T2 to T3 to change blower speed during heating stage 1 operation Do not move wires WH and BR to the same t...

Page 13: ...rost O from board X X X X PU X 24V signal Range of AVAILABLE TAPS For wire color information and placement view DRC DRH Model Wiring PG 13 DRH OPERATION and WIRE RANGE CHART HI STATIC DRH OPERATIONS W...

Page 14: ...F 7 2 Switch any two leads of power supply at unit Single Point Power Block 7 3 Turn power to the unit ON 7 4 Perform step 7 again 8 Turn the temperature setting to the highest position stopping the u...

Page 15: ...then goes through the expansion device to the outdoor coil condenser on the cooling cycle where the liquid is evaporated and the vapor goes to the compressor The following figures show a schematic of...

Page 16: ...ly registers should be free of any obstructions The filters should be cleaned or replaced These few steps will help to keep the product up time to a maximum The Service section that follows should hel...

Page 17: ...dicates air flow below 1200 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 3 Ton Cooler Standard Static Drive Models DRC0364D and DRC0367D Down Flow Horizontal Flow SPEED...

Page 18: ...0 1567 843 807 0 48 1 0 1599 84 859 0 52 Shaded area indicates air flow below 1200 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 4 Ton Cooler Standard Static Drive Models...

Page 19: ...1 07 Shaded area indicates air flow below 1200 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 5 Ton Cooler Standard Static Drive Models DRC0604D and DRC0607D Down Flow Hor...

Page 20: ...91 0 8 2125 89 1066 0 99 1 0 2011 1033 0 96 1 0 2051 78 1113 1 03 T3 65 0 2 2226 892 0 69 T3 65 0 2 2211 885 0 68 0 4 2143 931 0 72 0 4 2128 938 0 73 0 6 2052 973 0 75 0 6 2034 988 0 76 0 8 1950 1027...

Page 21: ...or heating APPENDIX A BLOWER PERFORMANCE TABLES AC 3 Ton Cooler High Static Drive Models DRC0363W DRC0364W DRC0367W Horizontal Flow SPEED TAP EXTERNAL STATIC PRESSURE ESP IN W C SCFM RPM BHP SPEED TAP...

Page 22: ...1672 1373 1 31 2 0 1541 1418 1 35 2 0 1541 1418 1 35 Shaded area indicates air flow below 1200 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 4 Ton Cooler High Static Dri...

Page 23: ...68 Shaded area indicates air flow below 1500 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 5 Ton Cooler High Static Drive Models DRC0603W DRC0604W DRC0607W Horizontal Flo...

Page 24: ...dicates air flow below 1800 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 6 Ton Cooler High Static Drive Models DRC0723W DRC0724W DRC0727W Horizontal Flow SPEED TAP EXTER...

Page 25: ...icates air flow below 900 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 3 Ton Heat Pump Standard Static Drive Models DRH0364D and DRH0367D Down Flow Horizontal Flow SPEED...

Page 26: ...ded area indicates air flow below 1200 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 4 Ton Heat Pump Standard Static Drive Models DRH0484D and DRH0487D Down Flow Horizont...

Page 27: ...1128 1 07 Shaded area indicates air flow below 1200 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 5 Ton Heat Pump Standard Static Drive Models DRH0604D and DRH0607D Down...

Page 28: ...0 8 2083 979 0 91 0 8 2126 1066 0 99 1 0 2011 1033 0 96 1 0 2052 1113 1 03 T3 0 2 2226 892 0 69 T3 0 2 2211 885 0 68 0 4 2143 931 0 72 0 4 2128 938 0 73 0 6 2052 973 0 75 0 6 2034 988 0 76 0 8 1950 10...

Page 29: ...1233 0 91 2 0 1174 1233 0 91 Shaded area indicates air flow below 900 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 3 Ton Heat Pump High Static Drive Models DRH0363W DRH...

Page 30: ...1 18 2 0 1547 1289 1 23 2 0 1547 1289 1 23 Shaded area indicates air flow below 1200 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 4 Ton Heat Pump High Static Drive Model...

Page 31: ...1901 1390 1 57 Shaded area indicates air flow below 1500 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating 5 Ton Heat Pump High Static Drive Models DRH0603W DRH0604W DRH0607...

Page 32: ...ates air flow below 1800 SCFM 300 SCFM ton that is not recommended for High Stage cooling or heating Max BPH 2 3 6 Ton Heat Pump High Static Drive Models DRH0723W DRH0724W DRH0727W Horizontal Flow SPE...

Page 33: ...8 7 57 3 62 2 60 70 1 7 1 5 47 5 53 2 50 60 9 6 8 7 1 7 1 5 59 5 64 1 60 70 10 1 15 4 3 14 4 20 0 5 10 6 15 4 3 0 5 14 9 20 10 6 15 4 3 16 20 0 5 11 3 15 4 3 0 5 16 6 20 18 2 20 4 3 23 5 25 0 5 18 8...

Page 34: ...9 6 8 7 72 5 79 3 80 80 1 7 1 5 62 6 70 3 70 80 9 6 8 7 1 7 1 5 74 6 81 2 80 90 23 5 23 5 35 35 9 6 8 7 33 1 32 2 45 45 1 7 1 5 25 2 25 0 35 35 9 6 8 7 1 7 1 5 34 8 33 7 45 45 23 5 23 5 35 35 9 6 8 7...

Page 35: ...0 3 5 0 6 31 7 35 8 08 15 3 5 11 6 15 0 6 8 68 15 3 5 0 6 12 2 15 8 51 15 3 5 12 9 15 0 6 9 26 15 3 5 0 6 13 6 15 14 5 15 3 5 18 9 20 0 6 15 3 20 3 5 0 6 19 7 20 20 5 25 3 5 24 9 25 0 6 21 3 25 3 5 0...

Page 36: ...40 8 50 50 35 7 39 7 45 45 9 6 8 7 47 7 50 6 50 60 1 7 1 5 37 8 41 6 45 45 9 6 8 7 1 7 1 5 49 8 52 4 50 60 48 7 54 7 50 60 9 6 8 7 60 7 65 6 70 70 1 7 1 5 50 8 56 6 60 60 9 6 8 7 1 7 1 5 62 8 67 5 70...

Page 37: ...32 3 36 3 45 45 9 6 8 7 44 3 47 2 50 50 1 7 1 5 34 4 38 2 45 45 9 6 8 7 1 7 1 5 46 4 49 1 50 50 45 3 51 4 50 60 9 6 8 7 57 3 62 2 60 70 1 7 1 5 47 5 53 2 50 60 9 6 8 7 1 7 1 5 59 5 64 1 60 70 58 1 66...

Page 38: ...15 3 5 0 6 14 7 20 14 5 15 3 5 18 9 20 0 6 15 3 20 3 5 0 6 19 7 20 20 5 25 3 5 24 9 25 0 6 21 3 25 3 5 0 6 25 7 30 26 6 30 3 5 30 9 35 0 6 27 3 30 3 5 0 6 31 7 35 38 6 40 3 5 43 45 0 6 39 3 40 3 5 0 6...

Page 39: ...9 6 8 7 1 7 1 5 44 8 45 7 50 50 46 5 50 5 50 60 9 6 8 7 56 1 59 2 60 60 1 7 1 5 48 2 52 0 50 60 9 6 8 7 1 7 1 5 57 8 60 7 60 70 59 5 65 6 60 70 9 6 8 7 69 1 74 3 70 80 1 7 1 5 61 2 67 1 70 70 9 6 8 7...

Page 40: ...80 80 82 0 88 9 90 90 9 6 8 7 91 6 97 6 100 100 1 7 1 5 83 7 90 4 90 100 9 6 8 7 1 7 1 5 93 3 99 1 100 100 105 115 110 125 9 6 8 7 114 124 125 125 1 7 1 5 106 116 110 125 9 6 8 7 1 7 1 5 116 125 125 1...

Page 41: ...15 4 3 0 5 16 9 20 19 6 20 4 3 23 9 25 0 5 20 1 25 4 3 0 5 24 4 25 27 1 30 4 3 31 4 35 0 5 27 6 30 4 3 0 5 31 9 35 34 7 35 4 3 39 40 0 5 35 2 40 4 3 0 5 39 5 40 42 2 45 4 3 46 5 50 0 5 42 7 45 4 3 0 5...

Page 42: ...1 7 1 5 32 4 32 2 45 45 9 6 8 7 1 7 1 5 42 0 40 9 50 50 43 7 45 7 50 50 9 6 8 7 53 3 54 4 60 60 1 7 1 5 45 4 47 2 50 50 9 6 8 7 1 7 1 5 55 0 55 9 60 60 56 7 60 7 60 70 9 6 8 7 66 3 69 4 70 70 1 7 1 5...

Page 43: ...0 5 35 5 40 38 2 40 4 3 42 5 45 0 5 38 7 40 4 3 0 5 43 45 45 7 50 4 3 50 60 0 5 46 2 50 4 3 0 5 50 5 60 12 2 15 3 5 15 7 20 0 6 12 8 15 3 5 0 6 16 3 20 18 2 20 3 5 21 7 25 0 6 18 8 20 3 5 0 6 22 3 25...

Page 44: ...3 80 80 9 6 8 7 1 7 1 5 82 0 87 0 90 90 83 5 91 5 90 100 9 6 8 7 93 1 100 100 110 1 7 1 5 85 2 93 0 90 100 9 6 8 7 1 7 1 5 94 8 102 100 110 107 118 110 125 9 6 8 7 116 127 125 150 1 7 1 5 108 120 110...

Page 45: ...16 5 20 18 4 20 3 5 21 9 25 0 6 19 20 3 5 0 6 22 5 25 24 4 25 3 5 27 9 30 0 6 25 30 3 5 0 6 28 5 30 30 4 35 3 5 33 9 35 0 6 31 35 3 5 0 6 34 5 35 36 5 40 3 5 40 40 0 6 37 1 40 3 5 0 6 40 6 45 48 5 50...

Page 46: ...ILITIES RETURN 11 X 25 SUPPLY 12 X 17 Horizontal Discharge Vertical Discharge NOTE Refer to IOD 7082 included in the literature pack for installing horizontal duct covers 48 5 16 74 A 47 5 8 73 3 8 Mo...

Page 47: ...5 15 EH D S20 20 EH D S05 5 EH D S10 10 EH D S15 15 EH D S21 20 EH D S31 30 EH D S05 5 EH D S10 10 EH D S15 15 EH D S20 20 EH D S30 30 6 ton AC HP HI Static 3000 1950 1625 5 ton AC HI Static 5 ton HP...

Page 48: ...AT THE FACTORY AND BLACK WIRE TO COM TERMINAL FOR 208V SUPPLY POWER MOVE ORANGE WIRE FROM 240V TAP TO THE 208V TAP FUSE BLOCKS 1 2 ARE OPTIONAL IF OPTIONAL SAFETY EQUIPMENT SUCH AS A PHASE MONITOR FLO...

Page 49: ...RED WIRE ON THE JUMPER PLUG AND WIRE A NORMALLY CLOSED DRY CONTACT IN SERIES WITH THE CUT WIRE 24 VAC ALARM OUTPUT FROM OPTIONAL ECONOMIZER CONTROL MODULE NOTES 4 3 2 1 5 6A BLACK BLUE BLUE WITH PINK...

Page 50: ...S IN SERIES PLUG IN JUMPER PLUG AT THE LAST SAFETY DEVICE INSTALLED IF A THIRD PARTY SAFETY DEVICE IS FIELD INSTALLED CUT THE RED WIRE ON THE JUMPER PLUG AND WIRE A NORMALLY CLOSED DRY CONTACT IN SERI...

Page 51: ...OPTIONAL HIGH VOLTAGE OPTIONAL LOW VOLTAGE CHASSIS GROUND FIELD WIRING FACTORY WIRING HIGH VOLTAGE LOW VOLTAGE EARTH GROUND COMPONENT LEGEND PB L1 GND L2 LINE VOLTAGE FB1 F1 F1 BK RD 208 230V 1PH 60Hz...

Page 52: ...LECTRIC HEAT IS INSTALLED PLUG IN NEW HARNESS FROM ELECTRIC HEATER KIT TR1 PRIMARY HIGH VOLTAGE CONNECTIONS ORANGE WIRE CONNECTED TO 240 460 575V TAP AT THE FACTORY AND BLACK WIRE TO COM TERMINAL FOR...

Page 53: ...ORS ONLY USE N E C CLASS 2 WIRE FOR ALL LOW VOLTAGE FIELD CONNECTIONS IF OPTIONAL ECONOMIZER IS INSTALLED REMOVE ECON PLM JUMPER AND PLUG IN NEW HARNESS FROM ECONOMIZER KIT IF OPTIONAL ELECTRIC HEAT I...

Page 54: ...54...

Page 55: ...55...

Page 56: ...the feedback page PRODUCT REGISTRATION Thank you for your recent purchase Though not required to get the protection of the standard warranty registering your product is a relatively short process and...

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