Carrier 50ZHK, Installation Instructions Manual, Page: 1 / 22

Installation Instructions
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.
A10165
Fig. 1 – 50ZHK 024-036
A150067
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
Configuring Units for Downflow (Vertical) Discharge. . . . . . . . . 7
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
Checking Cooling and Heating Control Operation . . . . . . . . . . . . 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 Coil, Indoor Coil, and Condensate Drain Pan . . . . . . . . 18
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
Servicing Systems on Roofs with Synthetic Materials . . . . . . . . 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
50ZHK
Single-Packaged Heat Pump System
With Puron® (R-410A) Refrigerant
Single Phase
2 to 5 Nominal Tons (Sizes 024-060)