Carrier 50ZPM User Manual

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Subject to change without notice

Installation, Operation and Maintenance

Manufacturing point: Jeddah, Saudi Arabia

Nearest port of embarkation: Jeddah Islamic port

Product classification: Commercial

50ZPM – 50Hz

Nominal Cooling Capacity 3.0 – 5.0 Tons

HFC R

-

410A Refrigerant

The 50ZPM units are single side discharge rooftop cooling unit utilizing electric heat as an option. Units are pre-

wired, pre-charged with R-410A refrigerant, and tested at the factory. These units can be placed on the side of a

building or can be placed on a roof without roof curbs. Each unit is designed to occupy a minimal space. Piping and

drain connections are readily accessible.

The 50ZPM unit is a packaged air conditioner manufactured for housing, residential, and light commercial

applications. The 50ZPM unit design is the result of our firm commitment to the development of the finest air

conditioners that modern technology can offer.

Contact your local Carrier representative for additional reference materials and information. www.carrier.com

Quality Assurance

Certificate Reg. No:

04 100 950420

Package Rooftop Units – 50Hz

Page 1

Questions and Answers:

B
Brian MillerAug 12, 2025
Why does my Carrier Air Conditioner compressor operate continuously?
- K
  Kimberly JohnsonAug 12, 2025
  If the compressor operates continuously, it might be due to a dirty air filter (replace it), the unit being undersized for the load (decrease the load or increase the unit size), the thermostat being set too low (reset the thermostat), a low refrigerant charge (locate the leak, repair it, and recharge), air in the system (recover the refrigerant, evacuate the system, and recharge), or a dirty or restricted condenser coil (clean the coil or remove the restriction).
R
russellhendersonAug 16, 2025
What to do if Carrier 50ZPM Air Conditioner compressor and condenser fan will not start?
- N
  Nicholas MartinezAug 16, 2025
  If the compressor and condenser fan of your Carrier Air Conditioner will not start, the possible causes are: a power failure (call power company), a blown fuse or tripped circuit breaker (replace the fuse or reset the circuit breaker), a defective thermostat, contactor, transformer, or control relay (replace the component), insufficient line voltage (determine the cause and correct it), incorrect or faulty wiring (check the wiring diagram and rewire correctly), or the thermostat setting being too high (lower the thermostat setting below room temperature).
D
Dawn CooperAug 20, 2025
What causes excessive head pressure in Carrier 50ZPM?
- T
  Thomas DavisAug 20, 2025
  Excessive head pressure in your Carrier Air Conditioner can be caused by a dirty drier filter (replace the filter), a dirty condenser coil (clean the coil), refrigerant overcharge (recover excess refrigerant), a faulty TXV (check TXV bulb mounting and secure tightly to suction line and replace TXV if stuck open or closed), air in the system (recover refrigerant, evacuate system, and recharge), or restricted condenser air or air short-cycling (determine cause and correct).
W
William ByrdAug 25, 2025
Why does my Carrier 50ZPM compressor keep cycling?
- P
  Pamela BrownAug 25, 2025
  If your Carrier Air Conditioner compressor cycles (other than normally satisfying thermostat), it could be due to refrigerant overcharge or undercharge (recover refrigerant, evacuate system, and recharge to nameplate), a defective compressor (replace and determine cause), insufficient line voltage (determine cause and correct), a blocked condenser (determine cause and correct), a defective overload (determine cause and replace), a defective thermostat (replace thermostat), a faulty condenser-fan motor (replace), or a restriction in the refrigerant system (locate restriction and remove).
R
Ryan JacobsAug 27, 2025
How to fix low suction pressure in Carrier 50ZPM Air Conditioner?
- C
  Christopher GarrettAug 27, 2025
  If the suction pressure of your Carrier Air Conditioner is too low, it could be due to a dirty air filter (replace filter), a low refrigerant charge (check for leaks, repair, and recharge), a restricted metering device or low side (remove source of restriction), a faulty TXV (check TXV bulb mounting and secure tightly to suction line and replace TXV if stuck open or closed), insufficient evaporator airflow (increase air quantity and check filter and replace if necessary), the temperature being too low in the conditioned area (reset thermostat), or a restricted field-installed filter drier (replace).
A
Andrew NguyenAug 31, 2025
What to do if Carrier 50ZPM Air Conditioner compressor won't start but condenser fan runs?
- A
  Alan RodriguezAug 31, 2025
  If the compressor of your Carrier Air Conditioner will not start, but the condenser fan runs, it could be due to faulty wiring or loose connections in the compressor circuit (check wiring and repair or replace), a compressor motor that is burned out, seized, or has an internal overload open (determine cause and replace compressor), a defective overload (determine cause and replace), the compressor being locked out (determine cause for safety trip and reset lockout), or one leg of 3-phase power being dead (replace fuse or reset circuit breaker and determine cause).
S
smithjamieSep 4, 2025
What causes excessive suction pressure in Carrier 50ZPM?
- U
  ugriffithSep 4, 2025
  Excessive suction pressure in your Carrier Air Conditioner may be caused by a high heat load (check for source and eliminate), a faulty TXV (check TXV bulb mounting and secure tightly to suction line and replace TXV if stuck open or closed), or refrigerant overcharge (recover excess refrigerant).
D
Deborah CarrollSep 8, 2025
What causes low head pressure in Carrier Air Conditioner?
- D
  Daniel WhiteSep 8, 2025
  Low head pressure in your Carrier Air Conditioner can be caused by a low refrigerant charge (check for leaks, repair, and recharge) or a restriction in the liquid tube (remove restriction).

Carrier 50ZPM Specifications

General

Brand	Carrier
Model	50ZPM
Category	Air Conditioner
Language	English

Summary

Safety Considerations

General Safety Precautions

Essential safety precautions for unit operation and handling.

Installation Safety Guidelines

Safety guidelines for installing the unit correctly and safely.

Warranty Terms

Details on warranty terms and conditions for product modifications.

Physical Data

Base Unit Dimensions

Typical Installation

Introduction to Installation

Overview of the unit's design for outdoor installation and configurations.

Receiving and Installation Steps

Covers unit inspection, support, clearances, ductwork, drain, and electrical connections.

Pre-Start-Up Procedures

Start-Up: Refrigerant and Cooling Checks

Refrigerant Leak Check

Steps to check for and repair refrigerant leaks before charging.

Cooling and Heating Operation

Procedures for checking and adjusting cooling and heating control operations.

Refrigerant Charge

Guidelines for charging the system with refrigerant based on unit specifications.

Start-Up: Airflow and Operation Sequence

Indoor Airflow Adjustments

How to adjust indoor airflow for optimal performance and safety.

Sequence of Operation

Explanation of how the unit operates in cooling, heating, and fan modes.

Maintenance Requirements

Refrigerant Circuit and Components

Compressor Types and Oil

Information on different compressor types and their recommended oil types.

Electrical Data

Typical Wiring Schematic

Superheat Charging Table

Subcooling Chart

R-410A Refrigerant Quick Reference

Troubleshooting Guide

Start-Up Checklist

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