Carrier 50ZHK Installation Instructions Manual

Carrier 50ZHK Installation Instructions Manual

Single-packaged heat pump system with puron (r-410a) refrigerant single phase 2 to 5 nominal tons (sizes 024-060)
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50ZHK
Single-Packaged Heat Pump System
With Puron® (R-410A) Refrigerant
Single Phase
2 to 5 Nominal Tons (Sizes 024-060)
IMPORTANT:
Effective January 1, 2015, all split system and
packaged air conditioners must be installed pursuant to applicable
regional efficiency standards issued by the Department of Energy.
NOTE:
Read the entire instruction manual before starting the
installation.
NOTE: Installer: Make sure the Owner's Manual and Service
Instructions are left with the unit after installation.
Fig. 1 - 50ZHK 024-036
Fig. 2 - 50ZHK 042-060
Certified to leak 2% or less of nominal air conditioning CFM delivered
when pressurized to 1-in. W.C. with all present air inlets, air outlets, and
condensate drain port(s) sealed.

Table of Contents

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Receiving and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Identify Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Inspect Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Slab Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ground Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation Instructions
A10165
A150067
High-Voltage Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Routing Power Leads into Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting Ground Lead to Unit Ground . . . . . . . . . . . . . . . . . . . 8
Routing Control Power Wires (24-V) . . . . . . . . . . . . . . . . . . . . . . 8
Accessory Electric Heat Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pre-Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
No Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Low Charge Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Heating Mode Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Fan Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Cooling Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Heating Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Continuous Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Demand Defrost Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Unit Top Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Indoor Blower and Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Outdoor Fan Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrical Controls and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Metering Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
High Flow Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
High Pressure Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Loss of Charge Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Puron (R-410A) Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Synthetic Roof Precautionary Procedure . . . . . . . . . . . . . . . . . . . 19
Liquid Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Puron (R-410A) Refrigerant Charging . . . . . . . . . . . . . . . . . . . . 20
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Start-up Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Safety Considerations

Installation and servicing of this equipment can be hazardous due to
mechanical and electrical components. Only trained and qualified
personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such as
cleaning and replacing air filters. All other operations must be performed
by trained service personnel. When working on this equipment, observe
precautions in the literature, on tags, and on labels attached to or shipped
with the unit and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses, protective clothing, and
work gloves. Use quenching cloth for brazing operations. Have fire
extinguisher available. Read these instructions thoroughly and follow all

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Summary of Contents for Carrier 50ZHK

  • Page 1: Table Of Contents

    Outdoor Fan Adjustment ....... 18 A10165 Fig. 1 – 50ZHK 024-036 Electrical Controls and Wiring ......18 Refrigerant Circuit .
  • Page 2: Introduction

    50ZHK: Installation Instructions Introduction warnings or cautions included in literature and attached to the unit. Consult local building codes, the current editions of the National This packaged heat pump is fully self-contained and designed for Electrical Code (NEC) NFPA 70 and NFPA 90B-Installation Warm Air outdoor installation (See Fig.
  • Page 3 50ZHK: Installation Instructions during all moving operations. The unit must be level with in 1/4 in. (6 3. Size ductwork for cooling air quantity (cfm). The minimum air mm) for proper condensate drainage; the ground-level pad must be level quantity for proper electric heater operation is listed in Table before setting the unit in place.
  • Page 4 50ZHK: Installation Instructions A210788 Fig. 5 – Unit Base Dimensions, 024-036 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 5 50ZHK: Installation Instructions A210789 Fig. 6 – Unit Base Dimensions, 042-060 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 6 50ZHK: Installation Instructions INDOOR THERMOSTAT RETURN FROM TOP COVER POWER SOURCE POWER AND LOW-VOLTAGE DISCONNECT ENTRY PER NEC (UNIT AND COMPOSITE ELECTRIC RUST-PROOF HEATER) BASEPAN Power Wiring CONDENSATE DRAIN Control Wiring CONNECTION Condenser Airflow Evaporator Airflow A08207 Fig. 7 – Typical Installation Table 1 –...
  • Page 7: Configuring Units For Downflow (Vertical) Discharge

    50ZHK: Installation Instructions Table 2 – Minimum Airflow for Safe Electric Heater Operation HP Unit Minimum Airflow (CFM) Size 5 kW 7.5 kW 10 kW 15 kW 20 kW 1200 1200 1200 1800 1200 1800 Step 7 – Install Electrical Connections...
  • Page 8: Routing Power Leads Into Unit

    50ZHK: Installation Instructions Routing Power Leads into Unit Routing Control Power Wires (24-V) Use only copper wire between disconnect and unit. The high-voltage Form a drip-loop with the thermostat leads before routing them into the leads should be in a conduit until they enter the unit; conduit termination unit.
  • Page 9: Start-Up

    50ZHK: Installation Instructions 2. Repair leak following accepted practices. WARNING NOTE: Install a filter drier whenever the system has been opened for repair. PERSONAL INJURY AND ENVIRONMENTAL HAZARD 3. Add a small charge of Puron (R-410A) refrigerant vapor to system Failure to relieve system pressure could result in personal injury and/or and leak-test unit.
  • Page 10: Heating Mode Charge

    50ZHK: Installation Instructions 5. Measure indoor air (return air) wet-bulb temperature with a sling psychrometer or electronic equivalent. 6. Using Superheat Charging Table (Table 3) find outdoor temperature and indoor air wet-bulb temperature. At this intersection note superheat. Where a dash (--) appears on table do not attempt to charge unit under these conditions or refrigerant slugging may occur.
  • Page 11 50ZHK: Installation Instructions Table 3 – Superheat Charging A12098 Table 4 – Required Subcooling Required Subcooling °F(°C) Required Liquid Line Temperature for a Specific Subcooling (R-410A) Outdoor Ambient Temperature °F(°C) Required Subcooling ( Required Subcooling ( Pressure Pressure Model Size...
  • Page 12: Fan Operation

    50ZHK: Installation Instructions Step 4 – Indoor Airflow and Airflow Adjustments Continuous Fan With the continuous indoor fan option selected on the thermostat, G is WARNING continuously energized. The continuous fan speed will be the same as the cooling fan speed.
  • Page 13 50ZHK: Installation Instructions A210797 Fig. 14 – Connection Electrical Diagram Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 14 50ZHK: Installation Instructions A210799 Fig. 15 – Ladder Electrical Diagram Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 15 50ZHK: Installation Instructions A190339 Fig. 16 – Accessory Electric Heater Wiring Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 16 50ZHK: Installation Instructions Table 5 – Wet Coil Air Delivery EXTERNAL STATIC PRESSURE (in. W.C.) UNIT SPEED † SIZE COLOR DELIVERY SCFM SCFM ‡ SCFM 1015 SCFM 1060 1030 SCFM 1165 1130 1085 1045 1005 SCFM SCFM 1055 1005 ‡...
  • Page 17: Maintenance

    50ZHK: Installation Instructions Maintenance Unit Top Removal NOTE: When performing maintenance or service procedures that To ensure continuing high performance, and to minimize the possibility require removal of the unit top, be sure to perform all of the routine of premature equipment failure, periodic maintenance must be maintenance procedures that require top removal, including coil performed on this equipment.
  • Page 18: Outdoor Coil, Indoor Coil, And Condensate Drain Pan

    50ZHK: Installation Instructions 5. Remove grease and oil with a mild solvent. 6. Reassemble a. Slip the wheel back in the housing with the hub set screw parented in the correct direction. b. Install the filler panel. c. Reinsert the motor assembly in the wheel hub and align the mounting legs with the housing mounting hold locations.
  • Page 19: Metering Devices

    50ZHK: Installation Instructions Metering Devices Refrigerant Refrigerant cooling metering device is a piston located upstream of the CAUTION indoor coil distributor assembly. Refrigerant heating mode metering device is a piston located upstream of the outdoor coil distributor EXPLOSION, ENVIRONMENTAL SAFETY HAZARD assembly.
  • Page 20: Puron (R-410A) Refrigerant Charging

    50ZHK: Installation Instructions Puron (R-410A) Refrigerant Charging Refer to unit information plate and charging chart. Some Puron (R-410A) refrigerant cylinders contain a dip tube to allow liquid refrigerant to flow from cylinder in upright position. For cylinders equipped with a dip tube, charge Puron (R-410A) units with cylinder in upright position and a commercial metering device in manifold hose.
  • Page 21 50ZHK: Installation Instructions Table 9 – Troubleshooting Chart SYMPTOM CAUSE REMEDY Power failure Call power company Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker Defective contactor, transformer, control relay, or Compressor and outdoor fan Replace component...
  • Page 22 My Learning Center is your central location for professional residential HVAC training resources that help strengthen careers and businesses. We believe in providing high quality learning experiences both online and in the classroom. Access My Learning Center with your HVACpartners credentials at www.MLCtraining.com. Please contact us at mylearning@carrier.com with questions.

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