Carrier 38EN 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 38EN Specifications

General

Refrigerant	R-410A
Phase	1
Type	Air Conditioner
Cooling Capacity	1.5 Ton
Voltage (V)	208/230
Energy Efficiency Ratio (EER)	12.0
Operating Voltage	208/230V
Weight (Outdoor Unit)	Varies by model

Summary

Unit Identification and Options

Models and SEER Ranges

Lists condensing unit and heat pump models with their Seasonal Energy Efficiency Ratio (SEER) ratings.

Factory-Installed Options

Details the available factory-installed option packages for condensing units and heat pumps.

Safety and Cabinet Servicing

Safety Considerations

Provides essential safety warnings and precautions for servicing HVAC equipment.

Cabinet Removal Procedures

Step-by-step instructions for removing louvered casing and fan orifice from the unit.

Electrical Box Access

Describes how to access the electrical control box for maintenance and troubleshooting.

Electrical Component Troubleshooting

Contactor and Capacitor Testing

Explains how to test contactors and capacitors for proper electrical function and continuity.

Motor Control and Protection Devices

Covers troubleshooting Time Guard II, crankcase heaters, and various pressure/thermostat switches.

Control Boards and Fan Motors

Details troubleshooting for circuit boards, service sentry controls, and fan motors.

Compressor Mechanical Failure Analysis

Understanding Compressor Mechanical Failures

Differentiates mechanical compressor failures and discusses common causes like lack of lubrication.

Diagnosing Compressor Pumping Issues

Covers diagnosing locked rotor, runs-but-doesn't-pump, and low capacity conditions.

Addressing Noisy Compressor Conditions

Explains common causes and solutions for noisy compressor operation, including oil-related issues.

Compressor Electrical Failure Analysis

Identifying Single-Phase Motor Terminals

Provides guidance on identifying compressor motor terminals (C, S, R) for electrical testing.

Testing Motor Winding Integrity

Details methods for testing motor windings for open circuits, shorts, or ground faults using an ohmmeter.

Refrigeration System Operation and Leaks

Refrigeration Cycle Overview

Explains the basic principles of refrigeration cycles in cooling and heat pump systems.

Leak Detection and Repair Methods

Outlines techniques for detecting and repairing refrigerant leaks using various methods.

Service Valves and Fittings

Service Valve Functions and Use

Describes the purpose and operation of service valves for system maintenance and charging.

Carrier Compatible Fitting Connections

Details mechanical and sweat connection procedures for Carrier Compatible Fittings.

Reversing Valve and AccuRater™ Service

Reversing Valve Troubleshooting

Covers checking the reversing valve for proper operation in heat pump heating and cooling modes.

AccuRater™ Component Service

Provides instructions for checking, cleaning, or replacing AccuRater™ bypass type components.

Coil and Reversing Valve Procedures

Outdoor Coil Removal Process

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

Reversing Valve Replacement

Outlines the procedure for removing and replacing a defective reversing valve.

Coil Cleaning and Strainer Maintenance

Outdoor Coil Cleaning Procedure

Details the recommended method for cleaning the outdoor coil fins for optimal efficiency.

Liquid Line Strainer Replacement

Explains how to remove and replace a plugged liquid line strainer to ensure proper system performance.

System Charging and Accumulator Service

Accumulator Service and Replacement

Describes the function of the accumulator and procedures for its service or replacement.

System Charging Procedures

Provides guidance on correctly charging the system with refrigerant for optimal operation and component reliability.