desmon GBF-7 - Default Chapter; Table of Contents

Blast chiller Service Manual
7 Rev 07/04/2015
TABLE OF CONTENTS
1. BASIC SERVICE DIAGNOSTIC (STANDARD CONTROLLER) ............................................................ 9
1.1. ALARM/FAILURE LIST ....................................................................................... 10
1.2. FAILURE CODE DETAILS .................................................................................. 11
1.3. SERVICE MENU – CONFIGURATION PARAMETER ........................................ 11
1.3.1 Entering the configuration parameter ........................................................................................ 11
1.3.2 Parameter list (factory setting) ................................................................................................... 11
1.3.3 Temperature Probes Display ..................................................................................................... 28
2. BASIC SERVICE DIAGNOSTIC (TOUCH SCREEN CONTROLLER) .................................................. 33
2.1. ALARM/FAILURE LIST ....................................................................................... 34
2.2. FAILURE CODE DETAILS .................................................................................. 36
2.3. SERVICE MENU – CONFIGURATION PARAMETERS ...................................... 37
2.3.1 Entering the configuration parameter ........................................................................................ 37
2.3.2 Parameter list (factory settings) ................................................................................................... 1
2.3.3 Temperature Probes Display ....................................................................................................... 5
3. TROUBLESHOOTING ............................................................................................................................. 7
3.1. PROBES ............................................................................................................... 7
3.1.1. Checking the Probes ............................................................................................. 8
3.1.2. NTC (10kOhms@25°C/77°F) Diagram .................................................................. 9
3.1.3. NTC (10kOhms@25°C/77°F) Chart Table........................................................... 11
3.1.4. Pt1000 (1kOhms@0°C/32°F) Diagram ................................................................ 12
3.1.5. Pt1000 (1kOhms@0°C/32°F) Chart Table........................................................... 12
3.2. DOOR SWITCH ................................................................................................... 13
3.2.1 Checking the door switch ........................................................................................................... 13
3.3. PRESSURE SWITCH .......................................................................................... 14
3.3.1 Pressure Switch Working Principles – Alarm Connection ......................................................... 14
3.3.2 Pressure Switch Working Principles – Pump Down .................................................................. 15
3.3.3 Pressure Switch Factory Setting ................................................................................................ 15
3.4. DOOR FRAME HEATER ..................................................................................... 15
3.4.1 Heater cable features ................................................................................................................. 16
3.5. MAIN BOARD – STANDARD CONTROLLER ..................................................... 16
3.5.1 Checking Relay Outputs ............................................................................................................ 16
3.6. KEYPAD – STANDARD CONTROLLER ............................................................. 18
3.6.1 Keypad Troubleshooting ............................................................................................................ 18
3.7. MAIN BOARD – TOUCH SCREEN CONTROLLER ............................................ 18
3.7.1 Checking Relay Outputs ............................................................................................................ 19
3.8. DISPLAY – TOUCH SCREEN VERSION ............................................................ 22
3.8.1 Touch Screen Display Troubleshooting ..................................................................................... 22
3.9. REFRIGERANT PRESSURES CHECKS ............................................................ 23
4 SERVICE AND REPAIR ......................................................................................................................... 24
4.1 REMOVE THE FRONT PANEL ........................................................................... 24
4.1.1. Units from 5 to 18 shelves ................................................................................... 24
4.1.2 GBF-GN2/3 (smallest self-contained unit) ................................................................................. 25
4.1.3 Latest version of self-contained (5 to 18 pans) Effective June 2014 .............................. 26
4.2. REVERSING THE DOOR SWING (ONLY NON TOUCH SCREEN) ................... 27
4.3. ACCESSING THE CONDENSING UNIT ............................................................. 32
4.3.1 Unit from 5 to 18 shelves ........................................................................................................... 32
4.3.2 5 shelves units ........................................................................................................................... 37