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Norcold DE 728 User Manual

Norcold DE 728
29 pages
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SERVICE MANUAL
DUAL ELECTRIC AND 12 VOLT REFRIGERATORS
NON-TEK II MODELS
DE 828
DE 704C
DE 728
DE 400C
DE 251D
DE 250F
DE 254
DC 230
MRFT 615B
MRFT 630B
MRFT 640B
MRFT 660
SRBD 630
TRBD 630
SCQT 6406
SCQR 6800
V2000
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Norcold DE 728 Specifications

General IconGeneral
BrandNorcold
ModelDE 728
CategoryRefrigerator
LanguageEnglish

Summary

INTRODUCTION

Purpose of Service Manual

Outlines the manual's purpose for general service reference on Norcold refrigerators.

Model Designation

Explains Norcold Dual Voltage and 12 Volt refrigerator model designations for industry use.

Terminology

Defines terms specific to Norcold Dual Voltage and 12 Volt refrigerators for clarity.

GENERAL INFORMATION

Installation

Details unit location and ventilation requirements for optimal refrigerator performance and safety.

Leveling

Describes critical leveling requirements for Norcold Dual Voltage or 12 Volt refrigerators.

Power Sources

AC POWER CONNECTION

Details the correct connection procedure for the 120 VAC power supply to the refrigerator.

DC POWER CONNECTION

Explains how to correctly connect the 12 VDC power source to the refrigerator's terminal box.

WIRE SIZE TABLE

Provides recommended wire gauge sizes for DC connections based on wire length and power.

Trouble-Shooting 120 VAC Operation

Trouble-Shooting 12 VDC Operation

Potential Operating Problems

Continuous Compressor, No Cooling

Addresses continuous compressor operation without cooling, indicating potential issues like low voltage or leaks.

Intermittent AC Operation

Diagnoses intermittent cycling issues specific to AC operation but not DC, often due to oscillator problems.

Abnormal Noise During Operation

Lists common causes and checks for loud noises during refrigerator operation, such as floor instability or loose parts.

Excessive Evaporator Frost Build-up

Explains how to manage and prevent excessive frost buildup on the evaporator for efficient cooling.

No Cooling After Initial Start-up

Provides troubleshooting steps for refrigerators experiencing no cooling immediately after initial installation.

CHECKING A CIRCUIT BREAKER

CHECKING THE CHATTER PROTECTOR (TYPE B)

CHECKING THERMOSTAT CONTINUITY

CHECKING THE RELAY

CHECKING TRANSFORMER PRIMARY WINDINGS

CHECKING TRANSFORMER SECONDARY WINDINGS

CHECK FOR DEFECTIVE INVERTER OR OSCILLATOR

CHECKING COMPRESSOR CONTINUITY

COMPRESSOR CURRENT MEASUREMENT

COMPRESSOR VOLTAGE MEASUREMENT

CIRCUIT DIAGRAM: NORCOLD DE-828

CIRCUIT DIAGRAM: NORCOLD DE-704C

CIRCUIT DIAGRAM: NORCOLD DE-728 (U-65A-70)

CIRCUIT DIAGRAM: NORCOLD DE-728 (U-64A)

CIRCUIT DIAGRAM: NORCOLD DE-400C

CIRCUIT DIAGRAM: NORCOLD DE-250F, DE-251D

CIRCUIT DIAGRAM: NORCOLD DC-254

CIRCUIT DIAGRAM: NORCOLD DC-230

CIRCUIT DIAGRAM: NORCOLD MRFT-615B, MRFT-630B, MRFT-640B

CIRCUIT DIAGRAM: NORCOLD MRFT-660

CIRCUIT DIAGRAM: NORCOLD SRBD-630, TRBD-630

CIRCUIT DIAGRAM: NORCOLD SCQT-6406

CIRCUIT DIAGRAM: NORCOLD SCQT-6800

CIRCUIT DIAGRAM: NORCOLD V2000

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