Page 1: Table Of Contents
50TCQD17---D24 Single Package Heat Pump/Electric Heat Nominal 15 to 20 Tons With Puron  (R---410A) Refrigerant Service and Maintenance Instructions TABLE OF CONTENTS APPENDIX V. FAN PERFORMANCE ... . APPENDIX VI. MOTORMASTER SENSOR LOCA- SAFETY CONSIDERATIONS .
Page 2 WARNING WARNING FIRE, EXPLOSION HAZARD ELECTRICAL OPERATION HAZARD Failure to follow this Failure to follow this warning could result in personal warning could result in injury or death. death, serious personal Before performing service or maintenance operations injury and/or property on unit, LOCK- - OUT/TAGOUT the main power damage.
Page 3: Unit Arrangement And Access
UNIT ARRANGEMENT AND ACCESS Electric Heating: S Inspect power wire connections General S Ensure fuses are operational Fig. 1 and Fig. 2 show general unit arrangement and S Ensure manual- - reset limit switch is closed access locations. Economizer or Outside Air Damper S Check inlet filters condition S Check damper travel (economizer) S Check gear and dampers for dirt and debris...
Page 4: Supply Fan (Blower) Section
Economizer and Manual Outside Air Hood Screen pulley is on the motor. The pulleys are connected using a V- - belt. See Fig. 4. The Manual Outside Air Hood Screen is secured by three Belt screws and a retainer angle across the top edge of the hood.
Page 5 1. Loosen the four front and rear motor mounting plate bolts. 2. Loosen the two jack bolt jam nuts. 3. Turn the two jack bolts counterclockwise to loosen bringing the motor closer to the blower. 4. Remove the belt by gently lifting the old belt over one of the pulleys.
Page 6: Heat Pump Refrigeration System
HEAT PUMP REFRIGERATION Bearings: SYSTEM The fan system uses bearings featuring concentric split locking collars. A Torx T25 socket head cap screw is used to tighten the locking collars. Tighten the locking collar WARNING by holding it firmly against the inner race of the bearing and tightening the socket head cap screw.
Page 7 OUTDOOR Coil Cleaner is essential in extending the life of coils. POST COIL This cleaner is available from Carrier Replacement C12389 Fig. 9 - - Cleaning Condenser Coil Components Division (p/n P902- - 0301 for one gallon (3.8L) container, and p/n P902- - 0305 for a 5 gallon (19L) container).
Page 8 Totaline Environmentally Sound Coil Cleaner 7. Ensure cleaner thoroughly penetrates deep into finned Application Equipment: areas. 8. Interior and exterior finned areas must be thoroughly S 2.5 gal (9.5L) garden sprayer cleaned. S Water rinse with low velocity spray nozzle 9.
Page 9 LPS/LOC FILTER DRIER FILTER COOLING LIQUID LINES DRIER ACCUTROL DFT1 TXV 2 HPS2 TXV1 DFT 2 COMP 2 HPS1 INDOOR COIL OUTDOOR COIL STRAINER COMP 1 HEATING LIQUID LINES STRAINER C12383 Fig. 12 - - Typical Unit Piping Schematic with TXV Valves on the Indoor Coils enters the Accutrol tees from the coil end.
Page 10 Table 3. Defrost Mode Condensing A04--- A07 and D08--- D09/Circuit 2: Circuit Component Status/Position Defrost Thermostat Closed Outdoor Fan(s) Reversing Valve Energized Check Valve CV--- 1 Closed Check Valve CV--- 2 Open From Check Valve CV--- 3 Closed Transfer Header Troubleshooting Refrigerant Pressure C09231 Fig.
Page 11: Thermostatic Expansion Valve (Txv)
PuronR refrigerant, use only factory authorized TXVs. See Fig.18. 3. The needle valve on the pin carrier is spring loaded, exerting pressure on the underside of the diaphragm. TXV Operation Therefore, the bulb pressure equals evaporator pressure (at outlet of coil) plus spring pressure.
Page 12 CAPILLARY TUBE DIAPHRAGM PUSHRODS FEEDER TUBES INLET COIL OUTLET NEEDLE VALVE SPRING DISTRIBUTOR BULB EXTERNAL EQUALIZER TUBE C12046 Fig. 19 - - Thermostatic Expansion Valve (TXV) Operation Replacing TXV insulation and secure using the supplied bulb clamp. See Fig. 20. CAUTION 9.
Page 13: Puronr (R- - 410A) Refrigerant
Lubrication: The amount of refrigerant charge is listed on the unit’s Compressors are charged with the correct amount of oil at nameplate. Refer to Carrier Publication, “GTAC2- - 5 the factory. Charging, Recovery, Recycling and Reclamation Training Manual” and the following procedures:...
Page 14: Cooling Charging Charts
COOLING CHARGING CHARTS CAUTION DO NOT OVERCHARGE UNIT OVERCHARGING UNIT INCREASES THE RISK OF NUISANCE HIGH PRESSURE SWITCH TRIPS 15 TON HEAT PUMP CHARGING CHART - R410A REFRIGERANT (COOLING MODE) - CIRCUIT A Add Charge if Above the Curve Remove Charge if Below the Curve Compressor Discharge Pressure, (psig) 50HE501614 - A IN HEATING MODE,...
Page 15 CAUTION DO NOT OVERCHARGE UNIT OVERCHARGING UNIT INCREASES THE RISK OF NUISANCE HIGH PRESSURE SWITCH TRIPS 20 TON HEAT PUMP CHARGING CHART - R410A REFRIGERANT (COOLING MODE) - CIRCUIT A Add Charge if Above the Curve Remove Charge if Below the Curve Compressor Discharge Pressure, (psig) 50HE501616 - A IN HEATING MODE,...
Page 16 Replacing Compressor 3. The suction pressure should drop and the discharge pressure should rise, as is normal on any start- - up. WARNING NOTE: If the suction pressure does not drop and the discharge pressure does not rise to normal levels: FIRE, EXPLOSION HAZARD 4.
Page 17 Table 4. Heating and Cooling Troubleshooting PROBLEM CAUSE REMEDY Compressor and Power failure. Call power company. Outdoor Fan Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. Determine root cause. Will Not Start. Defective thermostat, contactor, transformer, Replace component.
Page 18: Convenience Outlets
CONVENIENCE OUTLETS 1. Remove the blank cover plate at the convenience out- let; discard the blank cover. WARNING 2. Loosen the two screws at the GFCI duplex outlet, un- til approximately -in (13 mm) under screw heads are exposed. ELECTRICAL OPERATION HAZARD 3.
Page 19: Heat Pump Controls
Duty Cycle — the unit- - powered convenience outlet has a Code Article 210, Branch Circuits, for use of convenience duty cycle limitation. The transformer is intended to outlets. provide power on an intermittent basis for service tools, HEAT PUMP CONTROLS lamps, etc;...
Page 20: Protective Controls
Jumpers JMP5, JMP6 and JMP7 are located in notches The High Static option supply fan motor is equipped with across the top of the CTB. See Fig. 29. These jumpers are a pilot- - circuit Thermix combination over- - temperature/ factory cut on all heat pump units.
Page 21 The DFB is located in the 50TCQ’s main control box (see Fig. 31). All connections are factory- - made through harnesses to the unit’s CTB, to IFC (belt- - drive motor), reversing valve solenoids and to defrost thermostats. DEFROST BOARD (HP ONLY) C12403 Fig.
Page 22 Reversing valve control — The DFB has two outputs for At the end of the continuous run period, the defrost unit reversing valve control. Operation of the reversing control will test for a need to defrost. On unit sizes 04- - 07 valves is based on internal logic;...
Page 23: Electric Heaters
Shorting the jumpers for a period of 1 to 3 seconds reduced to 9 seconds) The DFB will step the unit through reduces the defrost timer periods by a factor of 0.1 a Heating cycle and a Defrost cycle using these reduced sec/minute.
Page 24 Table 1 – Heater Model Number ACCESSORY HEATER/ HEATER PART UNIT MODELS HEATER KW* STAGES BASE UNIT VOLTAGE DISCHARGE NUMBER CRHEATER270A00 50TCQ-D17—24 208/230--- 3--- 60 Horizontal CRHEATER271A00 50TCQ-D17—24 208/230--- 3--- 60 Horizontal CRHEATER272A00 50TCQ-D17—24 208/230--- 3--- 60 Horizontal CRHEATER273A00 50TCQ-D17—24 460/400--- 3--- 60/50 25/17.4 Horizontal...
Page 25 On 50TCQ units, all fuses are 60- - A. Single point boxes containing fuses for 208/230- - V applications use UL Class RK5 250- - V fuses (Bussman FRNR 60 or Shawmut TR 60R). Single point boxes for 460- - V and 575- - V applications use UL Class T 600- - V fuses (Bussman JJS 60 or Shawmut A6T 60).
Page 26: Smoke Detectors
Controller Low- - Voltage Control Connections — Pull low- - voltage control leads from the heater module(s) - - The controller (see Fig. 39) includes a controller housing, VIO and BRN (two of each if two modules are installed; a printed circuit board, and a clear plastic cover. The identify for Module #1) - - to the 4- - pole terminal board controller can be connected to one or two compatible duct TB4 located on the heater bulkhead to the left of Heater...
Page 27 Air is introduced to the duct smoke detector sensor’s sensor be relocated to its operating location and the tubing sensing chamber through a sampling tube that extends into to the sampling tube be connected. See “Completing the HVAC duct and is directed back into the ventilation Installation of Return Air Smoke Sensor”...
Page 28 Completing Installation of Return Air Smoke 13. Reinstall plastic cover. Sensor 14. Installation is now complete. Refer to Sensor and Controller section for operation. FIOP Smoke Detector Wiring and Response All units: FIOP smoke detector is configured to automatically shut down all unit operations when a smoke condition is detected.
Page 29 PICK-UP TUBE EMT TO SEAL TIGHT CONNECTOR BRACKET SMOKE SAMPLING BOX EXPLODED DETAIL SCREW (2) KNOCKOUT LOCATION FOR HORIZONTAL HORIZONTAL ASSEMBLY KNOCKOUT LOCATION FOR VERTICAL VERTICAL ASSEMBLY C09685 Fig. 45 - - Supply Air Smoke Detector Sensor Location...
Page 30 C08246 Fig. 46 - - Typical Smoke Detector System Wiring Sensor and Controller Tests Controller Alarm Test The controller alarm test checks the controller’s ability to Sensor Alarm Test initiate and indicate an alarm state. The sensor alarm test checks a sensor’s ability to signal an NOTICE alarm state.
Page 31 Dirty Controller Test NOTICE The dirty controller test checks the controller’s ability to initiate a dirty sensor test and indicate its results. OPERATIONAL TEST NOTICE NOTICE Failure to follow this NOTICE can result in an unnecessary evacuation of the facility. Changing the dirty sensor test operation will put the OPERATIONAL TEST NOTICE detector into the alarm state and activate all automatic...
Page 32 Remote Test/Reset Station Dirty Sensor Test Dirty Sensor Test Using an SD- - TRK4: 1. Turn the key switch to the RESET/TEST position for The test/reset station dirty sensor test checks the test/reset two seconds. station’s ability to initiate a sensor dirty test and indicate the results.
Page 33 Indicators NOTE: All troubles are latched by the duct smoke detector. The trouble condition must be cleared and then Normal State: the duct smoke detector must be reset in order to restore it to the normal state. The smoke detector operates in the normal state in the absence of any trouble conditions and when its sensing Resetting Alarm and Trouble Condition Trips chamber is free of smoke.
Page 34: Premierlink Control
The PremierLink controller, Fig. 50 is compatible with to the LVTB. Field connections are made at a 16- - pole Carrier Comfort Networkr (CCN) devices. This control is terminal block (TB1) located on the bottom shelf of the designed to allow users the access and ability to change...
Page 35: Rtu- -Open Control System
RTU- - OPEN enables the unit to run in 100% instructions for its proper installation and for rooftop unit stand- - alone control mode, Carrier’s I- - Vu Open network, installation refer to base unit installation instructions and or a Third Party Building Automation System (BAS).
Page 36 C10818 Fig. 51 - - RTU- -OPEN Control Module...
Page 37: Pre- -Start- -Up
PRE- -START- -UP 2. Read and follow instructions on all WARNING, CAUTION, and INFORMATION labels attached to, START- -UP or shipped with, unit. WARNING WARNING PERSONAL INJURY HAZARD PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to follow this warning could result in personal injury or death.
Page 38 Additional Installation/Inspection 2. Turn off power to the unit and apply lockout/tagout procedures. Inspect the field installed accessories for proper 3. Reverse any two of the unit power leads. installation, making note of which ones do or do not require configuration changes. Inspect the RTU-OPEN’s 4.
Page 39: Start- -Up, Premierlink
- up and setpoints from a zone sensor or terminal control module. Refer to the following manuals for additional During start- - up, the Carrier software can also be used to installation, wiring and troubleshooting information verify communication with PremierLink controller.
Page 40: Appendix I. Model Number Significance
APPENDIX I. MODEL NUMBER SIGNIFICANCE Table 12. Model Number Nomenclature 10 0 11 1 12 2 13 3 14 4 15 5 16 6 17 7 18 Packaging & Seismic Compliance 0 = Standard Unit Heat Type 3 = California seismic compliant 50 –...
Page 41: Appendix Ii. Physical Data
APPENDIX II. PHYSICAL DATA Table 14. Physical data (Cooling) 15 and 20 Tons 50TCQ17 50TCQ24 Refrigeration System # Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll R--- 410a charge A/B (lbs) 16.0/16.5 23.4/23.4 Metering Device High--- press.
Page 42 APPENDIX II. PHYSICAL DATA (cont.) Table 15. Physical data (Cooling) 15 and 20 Tons 50TCQ17 50TCQ24 HORIZONTAL 1 / Belt Motor Qty / Drive type Max BHP 514--- 680 RPM range Motor frame size 2 / Centrifugal Fan Qty / Type Fan Diameter (in) 18 x 15/15 X 11 Motor Qty / Drive type...
Page 43 APPENDIX III. ELECTRICAL DATA Table 16. 15 and 20 tons ELECTRIC HEAT - - ELECTRICAL DATA 2- - STAGE COOLING SINGLE SPEED INDOOR FAN MOTOR SINGLE POINT KIT PART NUMBER CRSINGLE***A00 ELECTRIC HEATER PART NUMBER NO C.O. or UNPWRD C.O. w/PWRD C.O.
Page 44 APPENDIX III. ELECTRICAL DATA (cont.) Table 17. 15 and 20 tons ELECTRIC HEAT - - ELECTRICAL DATA 2- - STAGE COOLING 2- - SPEED INDOOR FAN MOTOR SINGLE POINT KIT PART NUMBER CRSINGLE***A00 ELECTRIC HEATER PART NUMBER NO C.O. or UNPWRD C.O. w/PWRD C.O.
Page 45: Appendix Iv. Wiring Diagrams
APPENDIX IV. WIRING DIAGRAMS Wiring Diagrams List 50TCQD SIZE VOLTAGE CONTROL POWER 208/230---3---60 50HE500937---G 50HE500894---I 460---3---60 50HE500937---G 50HE500895---I 575---3---60 50HE500937---G 50HE500895---I 208/230---3---60 50HE500937---G 50HE502048---B 460---3---60 50HE500937---G 50HE502045---B 575---3---60 50HE500937---G 50HE502045---B RTU ---OPEN* 50HE501687---B (50HE500751---J) PremierLink* 48TM500891---F (50HE500751---J) NOTE: Component arrangement on Control; Legend on Power Schematic * PremierLink and RTU- - OPEN control labels overlay a portion of the base unit control label.
Page 46 APPENDIX IV. WIRING DIAGRAMS (cont.) C150373 Fig. 52 - - 50TCQ- - D17 Power Wiring Diagram; 208/230- - 3- - 60...
Page 47 APPENDIX IV. WIRING DIAGRAMS (cont.) C12399 Fig. 53 - - 50TCQ- - D17 Power Wiring Diagram; 460- - 3- - 60/575- - 3- - 60...
Page 48 APPENDIX IV. WIRING DIAGRAMS (cont.) C12686 Fig. 54 - - 50TCQ- - D24 Power Wiring Diagram; 208/230- - 3- - 60...
Page 49 APPENDIX IV. WIRING DIAGRAMS (cont.) C12401 Fig. 55 - - 50TCQ- - D24 Power Wiring Diagram; 460- - 3- - 60/575- - 3- - 60...
Page 50 APPENDIX IV. WIRING DIAGRAMS (cont.) C160004 Fig. 56 - - 50TCQ- - D17/D24 Control Wiring Diagram; 208- - 3- - 60/460- - 3- - 60/575- - 3- - 60...
Page 51 APPENDIX IV. WIRING DIAGRAMS (cont.) C160005 Fig. 57 - - RTU- - OPEN Control Diagram...
Page 52 APPENDIX IV. WIRING DIAGRAMS (cont.) 50HE500751 50HE500891 Fig. 58 - - PremierLinktWiring Diagram...
Page 53: Appendix V. Fan Performance
5. For information on the electrical properties of Carrier’s motors, please see the Electrical information section of this book. 6. For more information on the performance limits of Carrier’s motors, please see the Application Data section of this book. Table 18. Economizer - - Vertical and Horizontal Duct Configuration...
Page 54 APPENDIX V. FAN PERFORMANCE (cont.) Table 20. – 50TCQD17 15 TON VERTICAL SUPPLY / RETURN Available External Static Pressure (in. wg) 4500 0.60 0.89 1.20 1.54 1.90 4900 0.72 1.02 1.36 1.72 2.09 5250 0.85 1.16 1.51 1.88 2.27 5600 1.01 1.33 1.70...
Page 55 APPENDIX V. FAN PERFORMANCE (cont.) Table 22. – 50TCQD24 20 TON VERTICAL SUPPLY / RETURN Available External Static Pressure (in. wg) 6000 1.13 1.48 6.82 1.80 2.13 2.46 6500 1.36 1.75 2.11 2.46 2.82 7000 1.63 2.06 2.45 2.83 3.21 7500 1.93 2.40...
Page 56 APPENDIX V. FAN PERFORMANCE (cont.) Table 24. – PULLEY ADJUSTMENT - - Vertical airflow units MOTOR PULLEY TURNS OPEN MOTOR/DRIVE UNIT COMBO Standard Static Medium Static High Static 1009 Standard Static Medium Static 1021 1002 High Static 1176 1153 1129 1106 1082 1059...
Page 57: Appendix Vi. Motormaster Sensor Locations
APPENDIX VI. MOTORMASTER SENSOR LOCATIONS SENSOR LOCATION C12035 Fig. 59 - - 50TCQD17 and 50TCQD24 Motormaster Sensor Location...
Page 58 Catalog No: 50TCQ---17---24---01SM Copyright 2016 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231 Edition Date: 02/16 Replaces: 50TCQ--- 02SM Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Page 59: Start-Up Checklist
START-UP CHECKLIST (Remove and Store in Job File) I. PRELIMINARY INFORMATION MODEL NO.: SERIAL NO.: DATE: TECHNICIAN: II. PRE-START-UP (insert checkmark in box as each item is completed) j VERIFY THAT JOBSITE VOLTAGE AGREES WITH VOLTAGE LISTED ON RATING PLATE j VERIFY THAT ALL PACKAGING MATERIALS HAVE BEEN REMOVED FROM UNIT j REMOVE ALL SHIPPING HOLD DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS j VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS...
Page 60 Catalog No: 50TCQ---17---24---01SM Copyright 2016 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231 Edition Date: 02/16 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. Replaces: 50TCQ--- 02SM...

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