Contents
Service Technician Guide
Contents
Introduction
Summary of DANGERS, WARNINGS, and Cautions
Disconnect Power for Permanently Connected Hardwired Units
Unit Disassembly
Disconnect Power for CORD-CONNECTED Unit
Tools Needed
Open the Control BOX
Remove the Unit from the Wall Sleeve
Accessing OUTDOOR-AIR Section Components
Accessing Unit Components
Accessing INDOOR-AIR Section Components
Remove the Discharge Deck Assembly
Ptac Unit with Lateral Duct Accessory Installed
Remove the AIR Discharge Grille
Gusset Removal
Reinstall Front Panel
Location of Screws on Discharge Grille
Component Cleaning Schedule
General Cleaning
Cleaning and Safety
Monthly Cleaning
Cleaning the Outdoor AIR Vent Filter
Access and Clean Indoor FAN and FAN Scroll
Seasonal Cleaning
Cleaning the Indoor and Outdoor Coils
Ptac Exterior Surfaces
Compressor
Rotary Compressor Components
Basic Hermetic Compressor Electrical Measurements
Compressor Troubleshooting
Disconnect ALL Power to the Unit
Compressor Replacement
Basic Compressor Troubleshooting Guide
SHORTED/OPEN Windings Test
Strainer Capillary Tube Location
Heater Removal
Heaters
Common Causes Heater Failure
Disconnect ALL Power to Unit
Acceptable Heater Resistance Values
Operating Controls
UNIT-MOUNTED Controls
Remote Thermostat Troubleshooting
WALL-MOUNTED Thermostat Controls
Do not daisy chain R 24 VAC
Description of Selector Switch Settings Figure
NON-USER Adjustable Controls
Tools Needed
Component Operation and Troubleshooting
Sequence of Operation
Indoor Thermostat IT CONTACTS, ALL 52CE, PE Models
Indoor Thermostat IT CONTACTS, ALL 52CQ, PQ Models
Electrical Components Removal and Replacement
Capacitor Test
Component Locations Open Control BOX
Basic FAN Motor Electrical Tests
FAN Motor Troubleshooting
FAN Motor
FAN Motor Troubleshooting Chart Typical 208/230 Volt Motors
Typical 265 Volt Motors
FAN Motor Replacement
Location of Wiring Schematic On Front Panel of Control BOX
Field Temperature Charts
100 110 120 130
52P 12,000 BTU Unit Field Temperature Chart High Cool 50% RH
Indoor
Series
Indoor
52C,P Series
Page
000 Btu 52P-12,000 Btu 52C-12,000 Btu 15,000 Btu
Wiring Diagrams
Refer to Figures 68-72 for Typical Wiring Schematics
Component Legend
CAP
Component Connection Marked Fan Motor
Page
Most Frequent Ptac Service Questions
Accessories
Accessory Form Number Part Number Description
52C Performance and Physical Data
Amps
52P Performance and Physical Data
52PE-512---3
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Copyright 2002 Carrier Corporation