Carrier 38EH024 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 38EH024 Specifications

General

Brand	Carrier
Model	38EH024
Category	Heat Pump
Language	English

Summary

Safety Considerations

Service

Contactors

Explains the function and troubleshooting of contactors in the unit's electrical system.

Capacitors

Details how to test and troubleshoot capacitors, including run and start types.

Pressure Switches

Details the function and troubleshooting of low- and high-pressure switches.

High-Pressure Switch

Explains the function and troubleshooting of the high-pressure safety switch.

Defrost Thermostats

Explains the function and troubleshooting of defrost thermostats in heat pump systems.

Compressor

Mechanical Failures

Discusses mechanical failure categories for compressors, where the motor appears normal.

Locked Rotor

Explains the locked rotor failure mode in compressor motors.

Runs, Doesn't Pump

Describes compressor failure where it runs but does not pump refrigerant.

Runs, Doesn't Pump, High-To-Low Side Leak

Details a compressor failure where hot gas leaks internally, causing overheating.

Runs and Pumps, Low Capacity

Explains compressor failure due to internal valve damage causing reduced capacity.

Electrical Failures

Discusses electrical failure categories for compressors.

Single-Phase Motors

Determining Internal Connections

Open Circuit

Ground Circuit

Short Circuit

System Clean-Up After Burn-Out

Compressor Removal and Replacement

Refrigeration System

Leak Detecting

Reversing Valve

System Charging

Guidelines for correctly charging the system with refrigerant for optimal performance.