Carrier 50HQP072-120 - Manuals

6 EXISTING DUCT SYSTEM — If the unit is connected to existing ductwork, consider the following:• Verify that the existing ducts have the proper capacity to handle the unit airflow. If the ductwork is too small, larger ductwork should be installed. • Check existing ductwork for leaks and repair as ne...

7 7. Mount motor, motor sheave, blower sheave and belt. Make sure wires are not pinched and not over sharp edg- es. Adjust motor downward to tighten belt. Raise or lower motor slide assembly with adjusting bolt and retighten the 2 slide nuts. Check for correct tension. Rewire motor (at contactor) fo...

8 • All plastic to metal threaded fittings should be avoided due to the potential to leak. Use a flange fitted substitute. • Teflon tape thread sealant is recommended to minimize internal fouling of the heat exchanger. • Use backup wrench. Do not overtighten connections. • Route piping to avoid serv...

9 Determine percent voltage imbalance. = 0.95% This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electri- cal components. NOTE: If more than 2% voltage imba...

10 Table 2 — Water Quality Guidelines LEGEND *Heat exchanger materials considered are copper, cupronickel, 304 SS (stainlesssteel), 316 SS, titanium.†Closed recirculating system is identified by a closed pressurized piping system.**Recirculating open wells should observe the open recirculating desig...

12 Fi g. 1 3 — 5 0 HQP 07 2- 1 2 0 Unit s — T y pic a l Contr o l W iring wi th D e lux e D Contr o l See legend and notes on page 11. D elux e D1 De lu xe D D elux e D2 D elux e D D elux e D2 D elux e D1

14 Table 3A — Electrical Data — 50HQP072-120 Standard Units Table 3B — Electrical Data — 50HQP072-120 Dual Point Power Units LEGEND *Time-delay fuse or HACR circuit breaker. Table 4 — Low Voltage VA Ratings * Standard transformer is 75 VA. UNIT 50HQP VOLTAGE CODE VOLTAGE MIN/MAX VOLTAGE BLOWER OPTIO...

15 Step 10 — Install Field Control Wiring THERMOSTAT CONNECTIONS — The thermostat should be wired directly to the Aquazone™ control board. See Fig. 18 and 19. The thermostat should be located on an interior wall in a larger room, away from supply duct drafts. DO NOT locate the thermostat in areas su...

21 AIR COIL FREEZE PROTECTION (FP2) LIMIT SET- TING — Select jumper 2 (JW2-FP2 Low Temp) to choose FP2 limit of –12.2 C or –1.1 C. To select –1.1 C as the limit, DO NOT clip the jumper. To select –12.2 C as the limit, clip the jumper. ALARM RELAY SETTING — Select jumper 4 (JW4-AL2 Dry) for connectin...

22 MECHANICAL NIGHT SET BACK — When NSB input is connected to ground C, all thermostat inputs are ignored. A thermostat set back heating call will then be connected to the OVR input. If OVR input becomes active, then the Deluxe D control will enter Night Low Limit (NLL) staged heating mode. The NLL ...

23 4. Check the temperature of both supply and discharge water. 5. Air temperature drop across the coil should be checked when compressor is operating. Air temperature drop should be between –9.4 and –3.9 C. Unit Start-Up in Heating Mode NOTE: Operate the unit in heating cycle after checking the coo...

24 or before access to all connections is limited. Test pressure may not exceed the maximum allowable pressure for the unit and all components within the water system. Carrier will not be responsible or liable for damages from water leaks due to inadequate or lack of a pressurized leak test, or dama...

25 immediately once the demand is removed. The control re- verts to Heating Stage 1 mode. If there is a master/slave or dual compressor application, all compressor relays and re- lated functions will operate per their associated DIP switch 2 setting on S1.HEATING STAGE 3 — In Heating Stage 3 mode, t...

26 Table 15 — Complete C Control LED Code and Fault Descriptions LEGEND Table 16 — Aquazone™ Deluxe D Control Current LED Status and Alarm Relay Operations LEGEND NOTES:1. If there is no fault in memory, the Fault LED will flash code 1.2. Codes will be displayed with a 10-second Fault LED pause.3. S...

27 Filters — Filters must be clean for maximum performance. Inspect filters every month under normal operating conditions. replace when necessary. Washable, high efficiency, electrostatic filters, when dirty, can exhibit a very high pressure drop for the fan motor and re- duce air flow, resulting in...

28 For average scale deposit, allow solution to remain in con- denser overnight. For heavy scale deposit, allow 24 hours. Drain condenser and flush with clean water. Follow acid manu- facturer’s instructions. Compressor — Conduct annual amperage checks to in- sure that amp draw is no more than 10% g...

29 NOTE: There should be a 3 to 6 mm gap between the mating part hub and the bushing flange. If the gap is closed, the bushing is probably the wrong size. 3. With taper-lock bushed hubs, be sure the bushing bolts are tightened evenly to prevent side-to-side pulley wob- ble. Check by rotating sheaves...

30 TROUBLESHOOTING When troubleshooting problems with a WSHP, see Table 18. Thermistor — A thermistor may be required for single- phase units where starting the unit is a problem due to low voltage. See Fig. 26 for thermistor nominal resistance. Control Sensors — The control system employs 2 nom- in...

31 Table 18 — Troubleshooting LEGEND FAULT HEATING COOLING POSSIBLE CAUSE SOLUTION Main Power Problems X X Green Status LED Off Check line voltage circuit breaker and disconnect.Check for line voltage between L1 and L2 on the contactor.Check for 24-vac between R and C on controller.Check primary/sec...

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500077-01 Printed in U.S.A. Form 50HQP-C1SI Pg CL-2 11-10 Replaces: New Copyright 2010 Carrier Corporation - - - - - - - - - - - - - - -...