Carrier 38E User Manual

HEATING & COOLING
38E,Q
Condensing Units and Heat Pumps
Service Manual
38EH,EN,ES,QH,QN,QS
TABLE OF CONTENTS
Page
INTRODUCTION. 1, 2
Models and SEER Ranges. 1
Factory-Installed Options. 2
SAFETY CONSIDERATIONS . . . . .. 3
SERVICE. 3
Cabinet. 3
• REMOVING LOUVERED CASING
• REMOVING FAN ORIFICE
• ELECTRICAL BOX ACCESS
Electrical. 5 - 1 1
• CONTACTORS
• CAPACITORS
• TIME GUARD II
• CRANKCASE HEATER
• PRESSURE SWITCHES
• DEFROST THERMOSTATS ,
• PRINTED-CIRCUIT CONTROL BOARD
• FAN MOTORS
• SERVICE SENTRY CONTROL BOARD
• OUTDOOR THERMOSTATS
Page
Compressor.12-15
• MECHANICAL FAILURES
• ELECTRICAL FAILURES
• SYSTEM CLEAN-UP AFTER BURN-OUT
• COMPRESSOR REMOVAL AND
REPLACEMENT
Refrigeration System . 1 5 - 20
• REFRIGERATION CYCLE
• LEAK DETECTING
• SERVICE VALVES
• CARRIER COMPATIBLE FITTING
• ACCURATER ™ (Bypass Type) COMPONENTS
• REVERSING VALVE
• COIL REMOVAL
• COIL CLEANING
• LIQUID LINE STRAINER
• ACCUMULATOR
• SYSTEM CHARGING (for all approved
combinations)
INTRODUCTION
This Service Manual enables a service technician to similar, however, there are distinct differences. Tables 1
service and repair a family of similar condensing units and 2 help to differentiate these differences,
and heat pumps. Outwardly, many models appear
Models and SEER Ranges
Table 1 — Condensing Units Table 2 — Heat Pumps
MODEL
DIAMETERS SEER*
MODEL
DIAMETERS
SEER* C:O.P.f
(in.)
(Nominal)
(in.)
(Nominal)
(Minimum)
38EH015
22
9.0
38QH015
22
•9.0
2.85
38EH018 22
9.0
38QH018
22
9.0
2.85
38 EH 024
22
9.0
38QH024 30
9.0
2.85
38 EH 030 30
9.0
38QH030 30
9.0 2.85
38 EH 036 30 9.0
38QH036
30
9.0
2.85
38 EH 042 30 9.0
38QH042 30
9.0
2.85
38 EH 048 30 9.0
38QH048
30
9.0
2.85
38 EH 060
30
9.0
38QH060 39
9.0 2.85
38EN015
17
8.0
38QN015
17
8.0
2.55
38EN018
17
8.0
38QN018
17
8.0
2.55
38EN024
17
8.0
38QN024 22
8.0
2.55
38EN030 22
8.0
38QN030
22
8.0 2.55
38EN036
22
8.0
38QN036 30
8.0
2.55
38EN042 30 8.0
38QN042
30
8.0 .
2.55
38EN048 ' 30 8.0
38QN048
30
8.0
2.55
38EN060
30 8.0
38QN060
30
8.0
2.55
38ES018
30 ■
10.0
38QS018
30
10.0
2.85
38ES024
30 10.0
38QS024
30
10.0
2.85
38ES030
30
10.0
38QS030 30
10.0
2.85
38ES036
30
10.0
38QS036
30
10.0
2.85
38ES042
30
10.0
38QS042
30
10.0
2.85
38ES048
30
10.0
38QS048
30
10.0
2.85
38ES060 39
10.0
38QS060
39
10.0 2.85
SEER Seasonal Energy Efficiency Ratio. The higher the number, the fC.O.P. — Coefficient of Performance (heating), determined by dividing
less electrical power required to reach a given capacity. SEER Btu output by power input required to produce this Btu output,
is derived by dividing output energy by input energy.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 1 |1 |4 |4 PC101 Catalog No. 563-857 Printed in U.S.A. Form38E,Q-1SM Pg 1 11-85 Replaces: New
Tab 3a|5a|2a|5a For replacement items use Carrier Specified Paris.

Carrier 38E Specifications

General

Brand	Carrier
Model	38E
Category	Heat Pump
Language	English

Summary

Introduction to Service Manual

Models and SEER Ranges

Lists condensing unit and heat pump models with their SEER ratings.

Factory-Installed Options

Details factory-installed options available for the units.

Factory Option Packages

Condensing Unit Specifications

Provides specifications for condensing units, including oil and refrigerant charge.

Heat Pump Specifications

Lists specifications for heat pumps, including oil and refrigerant charge.

General Safety Precautions

Unit Service and Component Access

Instructions for accessing and removing cabinet components and electrical parts.

Louvered Casing Details

Fan Orifice Removal Procedure

Step-by-step guide to removing the fan orifice.

Contactor Operation and Testing

Details the function, troubleshooting, and testing of contactors.

Capacitor Function and Testing

Start Assist Components (PTC/Capacitors)

Describes hard-start capacitors and PTC devices for compressor starting.

Time Guard II Operation and Troubleshooting

Crankcase Heater Function and Testing

Details the crankcase heater's role in protecting the compressor.

Pressure Switch Operation and Testing

Covers low- and high-pressure switches for system protection.

High-Pressure Switch Function and Testing

Liquid Line Pressure Switch Function

Describes the liquid line pressure switch used in heat pumps.

Defrost Thermostat Function and Testing

Details the defrost thermostat's role in heat pump defrost cycles.

Defrost Control Board Functionality

Explains the defrost control board for heat pumps.

Defrost Control Board Troubleshooting Steps

Fan Motor Maintenance and Troubleshooting

Service Sentry Control Board Functionality

Outdoor Thermostat Testing and Calibration

Describes how to test and calibrate outdoor thermostats.

Compressor Overview and Failure Categories

Mechanical Compressor Failures Explained

Discusses mechanical issues that prevent normal compressor function.

Locked Rotor Compressor Failure

Compressor Runs But Doesn't Pump

Explains compressor failure where motor runs but no refrigerant is pumped.

Low Capacity Compressor Performance

Details compressor issues causing reduced pumping capacity.

Electrical Compressor Failures

Covers electrical issues affecting compressor motor operation.

Single-Phase Motor Terminals

Three-Phase Motor Resistance

Describes resistance testing for three-phase motors.

Motor Winding Open Circuit Test

Steps to check for broken windings in compressor motors.

Motor Winding Ground Test

Procedures for checking for shorts to ground in motor windings.

System Cleaning After Compressor Burn-Out

Refrigeration Cycle Operation Explained

Describes the basic refrigeration cycle in cooling and heat pump modes.

Refrigerant Leak Detection Methods

Service Valve Function and Use

Explains the purpose and connection of service valves.

Carrier Compatible Fitting Installation

Instructions for connecting Carrier compatible fittings.

AccuRater Bypass Component Service

Reversing Valve Operation and Testing

Explains the reversing valve's function in heat pumps and how to test it.

Reversing Valve Cooling/Defrost Mode Testing

Reversing Valve Heating Mode Testing

Details testing points for the reversing valve in heating mode.

Outdoor Coil Removal Procedure

Step-by-step guide for removing the outdoor coil assembly.

Outdoor Coil Cleaning Procedure

Liquid Line Strainer Replacement

Details the removal and replacement of the liquid line strainer.

Accumulator Function and Replacement

System Charging Procedures

Guidelines for charging the refrigeration system correctly.