desmon GBF-3GN2/3 User Manual

Service Manual
Blast Chiller

desmon GBF-3GN2/3 Specifications

General

Brand	desmon
Model	GBF-3GN2/3
Category	Chiller
Language	English

Summary

Service Manual

Safety Precautions

Electrical Safety Requirements

Guidelines for safe electrical connections, grounding, and compliance with codes.

General Safety and Maintenance

Repair Work Safety and Lockout/Tagout

1. Basic Service Diagnostic (Standard Controller)

1.1 Alarm/Failure List

Lists common alarms, their causes, and consequences for standard controllers.

1.2 Failure Code Details

Explains how to access and interpret failure code details and HACCP features.

1.3 Service Menu Configuration

Details accessing and configuring service menu parameters for standard controllers.

2. Basic Service Diagnostic (Touch Screen Controller)

2.1 Alarm/Failure List

Lists alarms, their causes, and consequences for touch screen controllers.

2.2 Failure Code Details

Explains how to access and interpret failure code details on touch screen models.

2.3 Service Menu Configuration

Guides on accessing and configuring service menu parameters for touch screen controllers.

2.3.1 Entering Configuration Parameters

2.3.2 Parameter List (Factory Settings)

2.3.3 Temperature Probes Display

3. Troubleshooting

3.1 Probes

Details on temperature sensing probes, their types, and troubleshooting common issues.

3.1.1 Checking the Probes

Steps to diagnose probe failures by checking resistance and connections.

3.1.2 NTC Probe Data

3.1.4 Pt1000 Probe Diagram

3.2 Door Switch

3.2.1 Checking the Door Switch

Procedure to test the door switch functionality and diagnose issues.

3.3 Pressure Switch

3.3.1 Pressure Switch Working Principles

Explains how pressure switches operate and connect to trigger alarms or pump down.

3.3.3 Pressure Switch Factory Setting

3.4 Door Frame Heater

3.5 Main Board - Standard Controller

3.5.1 Checking Relay Outputs

Procedure for testing the functionality of relays controlled by the main board.

3.6 Keypad - Standard Controller

3.7 Main Board - Touch Screen Controller

3.7.1 Checking Relay Outputs

How to check relay states and force activation via the I/O menu on touch screen controllers.

3.8 Display - Touch Screen Version

3.8.1 Touch Screen Display Troubleshooting

Diagnosing communication issues between the touch screen display and power board.

3.9 Refrigerant Pressures Checks

4 Service and Repair

4.1 Remove the Front Panel

Instructions for removing the front panel on various unit models.

4.1.1 Units from 5 to 18 shelves

Procedure for removing the front panel on units with 5 to 18 shelves.

4.1.2 GBF-GN2/3 (smallest self-contained unit)

Steps to remove the front panel on the smallest self-contained GBF-GN2/3 unit.

4.1.3 Latest version of self-contained (5 to 18 pans)

Method for removing the snap-in front panel on newer self-contained models.

4.2 Reversing the Door Swing

4.3 Accessing the Condensing Unit

4.3.1 Unit from 5 to 18 shelves

Procedure for accessing the condensing unit on 5 to 18 shelf units.

4.3.2 5 shelves units

4.3.3 GBF-3GN2/3 (smallest self-contained unit)

4.3.4 Remote units

4.4 How to Access Evaporator Assembly

4.4.1 Evaporator Assembly Description

Description of the components included in the evaporator assembly.

4.4.2 Accessing the Evaporator

4.4.3 Replacing Temperature Sensing Probes

Evaporator Probe Replacement

Needle Probe Replacement

4.5 Replacing the Evaporator Fan

4.6 Replacing the Door Switch

4.6.1 GBF-3GN2/3 (smallest self-contained unit)

Procedure for replacing the door switch on the smallest self-contained unit.

4.6.2 Units from 5 up to 18 shelves

Steps for replacing the door switch on units with 5 to 18 shelves.

4.7 Replacing the Pressure Switch

4.8 Replacing the Door Frame Heater

4.9 Replacing the Relay Board

4.10 Replacing the Keypad

5 Vacuum and Charge Procedure

5.1 Vacuum and Charging Instruction

General instructions for performing vacuum and charging procedures on refrigeration systems.

5.1.1 Self Contained Models

Procedure for vacuum and charging self-contained models.

5.1.2 Remote Models

5.1.3 Vacuum and Charging Recommendations

6 SCHEMATICS

6.1 Scheme of Components

Diagram showing the overall system components and their interconnections.

6.2 Airflow Requirements

6.2.1 Self Contained - Airflow Requirements

Specifies the required airflow clearances for self-contained units.

6.2.2 Remote - Airflow Requirements

6.3 Connection of Remote Cabinet to 'Non-Desmon' Condensing Unit

6.3.1 Connection with existing refrigerant lines

Guidance on connecting remote cabinets to existing refrigerant lines with quick fittings.

6.3.2 Hook the electrical power to the unit

I. How to Read the Model Number

II. Data Chart Table