Carrier 38EN024 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 38EN024 Specifications

General

Model	38EN024
Type	Heat Pump
Refrigerant	R-410A
Phase	1
Cooling Capacity	24000 BTU/h
Heating Capacity	24000 BTU/h
Voltage	208/230

Summary

Introduction

Models and SEER Ranges

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

Factory-Installed Options

Describes optional factory-installed packages available for condensing units and heat pumps.

Safety Considerations

Service

Cabinet

Procedures for accessing and removing cabinet panels for service.

Electrical

Troubleshooting and identification of electrical components like contactors, capacitors, and controls.

Compressor

Mechanical Failures

Identifies and explains compressor failures related to internal mechanical issues.

Electrical Failures

Explains compressor failures due to electrical motor abnormalities.

System Clean-Up After Burn-Out

Details the process for cleaning the system after a compressor burn-out incident.

Compressor Removal and Replacement

Provides instructions for safely removing and replacing a failed compressor.

Refrigeration System

Refrigeration Cycle

Explains the basic principles of refrigerant flow in cooling and heat pump modes.

Leak Detecting

Outlines methods for checking the system for refrigerant leaks.

Service Valves

Describes the function and use of service valves for system access and repair.

Carrier Compatible Fitting

Explains mechanical and sweat connections using Carrier Compatible Fittings.

AccuRater™ (Bypass Type) Components

Details the AccuRater™ component and its service procedures.

Reversing Valve

Covers the function, troubleshooting, and replacement of the reversing valve.

Coil Removal

Instructions for removing the outdoor coil for servicing or replacement.

Coil Cleaning

Procedures for cleaning the outdoor coil to ensure unit efficiency.

Liquid Line Strainer

Describes the function and replacement of the liquid line strainer.

Accumulator

Explains the accumulator's role and how to change it if necessary.

System Charging

Guidance on correctly charging the system with refrigerant for optimal performance.