desmon GBF-3GN2/3 Service Manual
  1. Manuals
  2. Brands
  3. desmon Manuals
  4. Chiller
  5. GBF-3GN2/3
  6. Service manual

desmon GBF-3GN2/3 Service Manual

Blast chiller
Hide thumbs
Table of Contents

Advertisement

Quick Links

Service Manual
Blast Chiller

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the GBF-3GN2/3 and is the answer not in the manual?

Questions and answers

Brad Thomas
May 19, 2025

Just hooked up my GBF -10+TSRS-ETL and the touch screen is faintly blink but not displaying anything. Is the display faulty or is there another problem

0
1 comments:
Mr. Anderson
May 23, 2025

Yes, the display is likely faulty. According to the information, if all connections are present but the display does not work, it indicates a faulty keypad or display. A faintly blinking screen without any display suggests it is not functioning correctly.

This answer is automatically generated

0
John Erfani
January 20, 2025

My compressor doesn’t start

0
1 comments:
Mr. Anderson
May 14, 2025

The compressor of the Desmon GBF-3GN2/3 may not start due to the following reasons:

1. Er0 (Room Probe Failure) – The unit does not allow cycling; if running, it will stop.
2. Er1 (Evaporator Probe Failure) – During storage cycle, evaporator fans do not run, which may prevent compressor operation.
3. Er3 (Needle Probe Failure) – If running a needle probe set temperature cycle, the unit will stop.
4. HP (High Discharge Pressure or Low Suction Pressure) – The unit will not operate in any cycle; compressor, evaporator, and condenser fans stop.
5. d-r (Door Open Too Long) – Compressor and condenser fan stop if the door is open for more than the set time (P39).
6. Err (Motherboard-Keyboard Connection Failure) – May cause operational issues.
7. Res (Power Failure During Cycle) – May interrupt compressor operation.
8. P21 (Minimum Compressor Shut-down Time) – If the minimum time has not passed, the compressor will not restart.

These issues can prevent the compressor from starting or cause it to stop during operation.

This answer is automatically generated

0

Summary of Contents for desmon GBF-3GN2/3

  • Page 1 Service Manual Blast Chiller...
  • Page 2 Rev 07/04/2015...
  • Page 3 Blast chiller Service Manual Rev 07/04/2015...
  • Page 4 Safety Precautions THIS MANUAL HAS BEEN PREPARED FOR PERSONNEL QUALIFIED TO INSTALL, MAINTAIN AND REPAIR ELECTRICAL REFRIGERATION EQUIPMENT, WHO SHOULD PERFORM THE INITIAL FIELD STARTUP AND ADJUSTMENTS OF THE EQUIPMENT COVERED BY THIS MANUAL. READ THIS MANUAL THOROUGHLY BEFORE OPERATING, INSTALLING, PERFORMING MAINTENANCE ON, OR REPAIRING THE EQUIPMENT.
  • Page 5 WARNING Before any maintenance work is performed, the appliance must be disconnected from the electrical supply. Apply a lockout tag to the electrical supply connection. WARNING All replacement parts that are not supplied by Desmon must be pre- approved before installation. Rev 07/04/2015...
  • Page 6 Repair Work Safety WARNING Repair work must only be performed by Desmon’s approved distributors or one of its authorized representatives. Desmon accepts no responsibility for any situation resulting from work performed by untrained and/or unauthorized technicians. ELECTRICAL LOCKOUT/TAGOUT PROCEDURE WARNING Before performing any service that involves electrical connection or disconnection and/or exposure to electrical components, always follow the Electrical LOCKOUT/TAGOUT Procedure.

  • Page 7: Table Of Contents

    Blast chiller Service Manual TABLE OF CONTENTS 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) ....................
  • Page 8 4.3.3 GBF-3GN2/3 (smallest self-contained unit) ................38 4.3.4 Remote units, units GBF20GN2/1, GBF40GN2/1,GBF20GN1/1 ..........39 4.4. HOW TO ACCESS EVAPORATOR ASSEMBLY ..........39 4.4.1 Evaporator Assembly Description ....................39 4.4.2 Accessing the Evaporator ......................41 4.4.3 Replacing the Temperature Sensing Probes ................41 4.5.

  • Page 9: Basic Service Diagnostic (Standard Controller)

    Blast chiller Service Manual 1. Basic Service Diagnostic (Standard Controller) The Controller will display alarms and failure codes that will assist in identifying the cause of a problem and direct attention to the components and circuits involved. In addition, a diagnostic service menu allows technicians to quickly check the temperature sensors, such as the needle probe, the chamber probe or the evaporator probe.

  • Page 10: Alarm/Failure List

    1.1. ALARM/FAILURE LIST Tab 1 CODE CAUSE CONSEQUENCE ROOM PROBE FAILURE Does not allow unit to cycle. If running, cycle will stop. EVAPORATOR PROBE FAILURE During storage cycle, evaporator fans do not run. NEEDLE PROBE FAILURE Does not allow a needle probe set temperature cycle to run.

  • Page 11: Failure Code Details

    Blast ch Blast chiller Service Manual 1.2. FAILURE CODE DETAILS FAILURE CODE DETAILS The HACCP feature provides the ability to get additional information such as The HACCP feature provides the ability to get additional information such as The HACCP feature provides the ability to get additional information such as failure code, date of occurrence, min/max temperature (if applicable), and failure code, date of occurrence, min/max temperature (if applicable), and failure code, date of occurrence, min/max temperature (if applicable), and...
  • Page 12 GBF-3GN2/3 and all GBF Trolley Units (Cycle Off Defrost) Parameter Description Factory Value unit of temperature measurement 0 = °F 1 = °C cabinet probe offset evaporator probe offset needle probe offset operational setpoint during the second hard chill step; also,...
  • Page 13 Blast chiller Service Manual Parameter Description Factory Value defrost type 0 = electric (defrost on relay) 1 = hot gas (defrost compressor and relay on) 2 = air (evaporator fan on) defrost end temperature (with reference to the evaporator probe) maximum defrost duration defrost interval during storage;...
  • Page 14 Parameter Description Factory Value low pressure input contact type 0 = NA (input active with contact closed) 1 = NC (input active with contact open) low pressure input alarm delay compressor thermal protection input contact type 0 = NA (input active with contact closed) 1 = NC (input active with contact open) compressor thermal protection input alarm delay UV light on duration (duration of cabinet sterilisation)
  • Page 15 Blast chiller Service Manual Parameter Description Factory Value temperature below which the minimum temperature alarm is activated during post-chill storage, with relation to P7, i.e. "P7 + P64" (with reference to the cabinet probe) 0 = no alarm temperature above which the maximum temperature alarm is activated during post-chill storage, with relation to P7, i.e.
  • Page 16 All GBF units from 5 to 18 Shelves (Hot gas Defrost) Parameter Description Factory Value unit of temperature measurement 0 = °F 1 = °C cabinet probe offset evaporator probe offset needle probe offset operational setpoint during the second hard chill step; also, operational setpoint during normal chilling (with reference to the cabinet probe) operational setpoint during freezing (with reference to the...
  • Page 17 Blast chiller Service Manual Parameter Description Factory Value defrost type 0 = electric (defrost on relay) 1 = hot gas (defrost compressor and relay on) 2 = air (evaporator fan on) defrost end temperature (with reference to the evaporator probe) maximum defrost duration defrost interval during storage;...
  • Page 18 Parameter Description Factory Value low pressure input contact type 0 = NA (input active with contact closed) 1 = NC (input active with contact open) low pressure input alarm delay compressor thermal protection input contact type 0 = NA (input active with contact closed) 1 = NC (input active with contact open) compressor thermal protection input alarm delay UV light on duration (duration of cabinet sterilisation)
  • Page 19 Blast chiller Service Manual Parameter Description Factory Value temperature below which the minimum temperature alarm is activated during post-chill storage, with relation to P7, i.e. "P7 + P64" (with reference to the cabinet probe) 0 = no alarm temperature above which the maximum temperature alarm is activated during post-chill storage, with relation to P7, i.e.
  • Page 20 All GBC units from 5 to 18 Shelves (Hot gas Defrost) Parameter Description Factory Value unit of temperature measurement 0 = °F 1 = °C cabinet probe offset evaporator probe offset needle probe offset operational setpoint during the second hard chill step; also, operational setpoint during normal chilling (with reference to the cabinet probe) operational setpoint during freezing (with reference to the...
  • Page 21 Blast chiller Service Manual Parameter Description Factory Value defrost type 0 = electric (defrost on relay) 1 = hot gas (defrost compressor and relay on) 2 = air (evaporator fan on) defrost end temperature (with reference to the evaporator probe) maximum defrost duration defrost interval during storage;...
  • Page 22 Parameter Description Factory Value low pressure input contact type 0 = NA (input active with contact closed) 1 = NC (input active with contact open) low pressure input alarm delay compressor thermal protection input contact type 0 = NA (input active with contact closed) 1 = NC (input active with contact open) compressor thermal protection input alarm delay UV light on duration (duration of cabinet sterilisation)
  • Page 23 Blast chiller Service Manual Parameter Description Factory Value temperature below which the minimum temperature alarm is activated during post-chill storage, with relation to P7, i.e. "P7 + P64" (with reference to the cabinet probe) 0 = no alarm temperature above which the maximum temperature alarm is activated during post-chill storage, with relation to P7, i.e.
  • Page 24 All GBC Trolley Units (Cycle Off Defrost) Parameter Description Factory Value unit of temperature measurement 0 = °F 1 = °C cabinet probe offset evaporator probe offset needle probe offset operational setpoint during the second hard chill step; also, operational setpoint during normal chilling (with reference to the cabinet probe) operational setpoint during freezing (with reference to the cabinet probe)
  • Page 25 Blast chiller Service Manual Parameter Description Factory Value defrost type 0 = electric (defrost on relay) 1 = hot gas (defrost compressor and relay on) 2 = air (evaporator fan on) defrost end temperature (with reference to the evaporator probe) maximum defrost duration defrost interval during storage;...
  • Page 26 Parameter Description Factory Value low pressure input contact type 0 = NA (input active with contact closed) 1 = NC (input active with contact open) low pressure input alarm delay compressor thermal protection input contact type 0 = NA (input active with contact closed) 1 = NC (input active with contact open) compressor thermal protection input alarm delay UV light on duration (duration of cabinet sterilisation)
  • Page 27 Blast chiller Service Manual Parameter Description Factory Value temperature below which the minimum temperature alarm is activated during post-chill storage, with relation to P7, i.e. "P7 + P64" (with reference to the cabinet probe) 0 = no alarm temperature above which the maximum temperature alarm is activated during post-chill storage, with relation to P7, i.e.

  • Page 28: Temperature Probes Display

    1.3.3 Temperature Probes Display To check the reading of the unit’s temperature sensing probes, first make sure the unit is in the OFF mode. 1. Press the NEDLE PROBE key and the DOWN arrow key together and hold for five (5) seconds. 2.
  • Page 29 Blast chiller Service Manual A belden shielded cable (3 wires) must be used. RS485 (2) PRINTER TERMINAL BLOCK MAIN BOARD TERMINAL BLOCK Connect the printer to the Main Board using coaxial shielded cables. The main controller must be set to recognize the printer and enable communication.
  • Page 30 To print the alarm list, the controller must be in the OFF mode. To print the alarm list, the controller must be in the OFF mode. Press the PROGRAM key for five (5) seconds. Press the PROGRAM key for five (5) seconds. If the printer communication has been enabled, the first display shown is f the printer communication has been enabled, the first display shown is f the printer communication has been enabled, the first display shown is “Prt”.
  • Page 31 Blast ch Blast chiller Service Manual Legend: Type of cycle Tab 3 Cycle code Description Needle probe soft chilling T*** Needle probe freezing T>>>* Needle probe hard chilling Time soft chilling t*** Time freezing t>>>* Time hard chilling P1……..99 Programmed cycle How to replace the paper roll Push on the printer front panel, Push on the printer front panel, the cover will open allowing the paper roll...
  • Page 32 Rev 07/04/2015...

  • Page 33: Basic Service Diagnostic (Touch Screen Controller)

    Blast chiller Service Manual 2. Basic Service Diagnostic (Touch Screen Controller) The Touch Screen Controller will display alarms that will assist in identifying the cause of a problem and direct attention to the components and circuits involved. In addition, a diagnostic service menu allows technicians to quickly check the temperature sensors (such as the needle probe, the chamber probe or the evaporator probe), the relay status, the door switch input and many other things.

  • Page 34: Alarm/Failure List

    2.1. ALARM/FAILURE LIST ALARM MESSAGE NOTES/CONSEQUENCES The door is open for more than the allowed time during DOOR a cycle. It's just a reminder to perform a regular service MAINTENAINCE inspection and preventive maintenance. Call your A.S.A. for more information. It means that the condenser temperature is to high if compared to a normal working condition, defined by a CONDENSER HIGH TEMPERATURE...
  • Page 35 Blast chiller Service Manual ALARM MESSAGE NOTES/CONSEQUENCES Evaporator probe failure. Call Service. EVAPORATOR PROBE (S2) CONDENSER PROBE (S3) (Not Condenser probe failure. Call Service. applicable in this version of Blast Chiller) Insert probe core 1 failure. Call Service. FOOD PROBE (PT1) Insert probe core 2 failure.

  • Page 36: Failure Code Details

    2.2. FAILURE CODE DETAILS When an alarm is occurring an alert icon will blink on the screen and the buzzer will activate. Click on the alarm icon to see details. Rev 07/04/2015...

  • Page 37: Service Menu - Configuration Parameters

    Blast chiller Service Manual 2.3. SERVICE MENU – CONFIGURATION PARAMETERS 2.3.1 Entering the configuration parameter From the HOME screen press MORE, then press SERVICE. Rev 07/04/2015...
  • Page 38 Insert the 4 digits password 2810 and hit OK to enter the menu. Click on PARAMETERS Rev 07/04/2015...
  • Page 39 Blast chiller Service Manual Press the left or right arrow to scroll pages. Press on the parameter to check or change value. Use the keyboard to change the parameter value and press OK to confirm the change. Rev 07/04/2015...
  • Page 40 Rev 07/04/2015...

  • Page 41: Parameter List (Factory Settings)

    2.3.2 Parameter list (factory settings) SELF 5 PANS 5 PANS Parameter Description CONTAINED 115V 230V 230V TROLLEY serial address [num] alarm intervention super-parameter [num] probes and door input configuration super- parameter [num] digital input configuration super-parameter [num] not used additional output super-parameter [num] additional output super-parameter [num] fans mode super-parameter [num] defrost mode super-parameter [num]...
  • Page 42 SELF 5 PANS 5 PANS Parameter Description CONTAINED 115V 230V 230V TROLLEY differential for restarting blast chiller after high condenser temperature [°C/°F] stop time during high condenser temperature [sec] max high condenser event before high temp. Alarm [num] time threshold for high condenser temp. Alarm [min] defrost ending temp related to evap.
  • Page 43 Blast chiller Service Manual SELF 5 PANS 5 PANS Parameter Description CONTAINED 115V 230V 230V TROLLEY core probe point 5 offset [°C/°F] not used not used cabinet RH% set point settable [num] mains voltage alarm limit [%] voltage alarm delay [hours] max number of voltage conditions before voltage alarm [num] time range in which is performed the mains...
  • Page 44 SELF 5 PANS 5 PANS Parameter Description CONTAINED 115V 230V 230V TROLLEY message [V/10] battery voltage threshold to detect presence of battery [V/10] delay time before safety turn off of battery circuit [sec] battery voltage offset [V/10] max air temperature during thawing [°C/°F] not used air temperature in pre-thawing cycle [°C/°F] evaporator fan speed in pre-thawing cycle [%]...

  • Page 45: Temperature Probes Display

    Blast chiller Service Manual 2.3.3 Temperature Probes Display From the HOME screen press MORE, OPTIONS and I/O Rev 07/04/2015...
  • Page 46 All relevant temperature values and input/output status will show in this screen Rev 07/04/2015...

  • Page 47: Troubleshooting

    Blast ch Blast chiller Service Manual 3. Troubleshooting WARNING: Before performing any service that involves electrical WARNING: Before performing any service that involves electrical WARNING: Before performing any service that involves electrical connection or disconnection and/or exposure to electrical components, disconnection and/or exposure to electrical components, always follow the always follow the Electrical LOCKOUT/TAGOUT Procedure.

  • Page 48: Checking The Probes

    Pt1000 NEEDLE PROBE TYPES (MULTICORE) 3.1.1. Checking the Probes When a Probe alarm occurs, it means there is something wrong with the sensor reading. The problem may be in either the sensor wires or the sensor itself. Probe alarms Er0, Er1, and Er3 (or error messages as per Touch Screen alarm list at 2.1.) are commonly due to an interrupted (open) circuit in the wires.

  • Page 49: Ntc (10Kohms@25°C/77°F) Diagram

    Blast chiller Service Manual STANDARD TOUCH SCREEN VERSION VERSION PROBES TERMINAL BLOCK If none of the above causes is found, the problem may exist in the main board internal circuits or in the mother board processor. The main board should be replaced. 3.1.2.
  • Page 50 kOhmsVsTemp Chart - NTC ZOOM 10kOhms @25°C [°C] Rev 07/04/2015...

  • Page 51: Ntc (10Kohms@25°C/77°F) Chart Table

    Blast chiller Service Manual 3.1.3. NTC (10kOhms@25°C/77°F) Chart Table Tab 4 °C °F kOhms °C °F kOhms °C °F kOhms 205,20 44,6 20,47 129,2 3,66 -38,2 193,80 46,4 19,63 3,54 -36,4 183,10 48,2 18,83 132,8 3,43 -34,6 173,10 18,06 134,6 3,33 -32,8 163,60...

  • Page 52: Pt1000 (1Kohms@0°C/32°F) Diagram

    3.1.4. Pt1000 (1kOhms@0°C/32°F) Diagram 3.1.5. Pt1000 (1kOhms@0°C/32°F) Chart Table °C °F Ohms °C °F Ohms 1136,10 803,10 1155,40 822,90 1174,70 842,70 1194,00 862,50 1214,90 882,20 1232,40 901,90 1251,60 921,60 1270,70 941,20 1289,80 960,90 1308,90 980,40 1328,00 1000,00 1347,00 1019,50 1366,00 1039,00 1385,00 1058,50...

  • Page 53: Door Switch

    Blast ch Blast chiller Service Manual 3.2. DOOR SWITCH DOOR SWITCH The Blast Chiller is equipped with a magnetic The Blast Chiller is equipped with a magnetic door switch. Opening the door is door switch. Opening the door is detected by a magnetic sensor.

  • Page 54: Pressure Switch

    3.3. PRESSURE SWITCH There is a pressure regulating switch installed to prevent compressor failures or improper operation due to high discharge pressure. Self contained models have a high pressure switch only, while remote units have a double switch, like the one shown below. In the old models both types of application had a double switch, triggering alarm “hp”...

  • Page 55: Pressure Switch Working Principles - Pump Down

    Blast chiller Service Manual TOUCH SCREEN VERSION Newest self contained models (D.O.M. above January 2014) will only have a high pressure switch. Once the pressures return to the normal range, the pressure switch will reset automatically. Newest remote application (D.O.M. above January 2015) won’t have an alarm connection with the pressure switch, but will be used to pump down by low pressure, or to cut out compressor in case of high pressure.

  • Page 56: Heater Cable Features

    3.4.1 Heater cable features Heater Cable Specifications 115V 220V Length 2.4 m 2 m (Heated) Resistance 1.4 kΩ 2.4 kΩ Current 80 mAmps 90 mAmps 3.5. MAIN BOARD – STANDARD CONTROLLER Each unit is equipped with a Main Board where the electrical components are connected.
  • Page 57 Blast chiller Service Manual L1 L2 Rev 07/04/2015...

  • Page 58: Keypad - Standard Controller

    3.6. KEYPAD – STANDARD CONTROLLER The RS485(1) port on the relay board is used to connect the keyboard. RS485(1) CONNECTION ON RELAY BOARD CONNECTION ON KEYBOARD 3.6.1 Keypad Troubleshooting Problems with the Keypad may include: Ground Connection Missing Display flashes and dims Negative (-) connection missing Display may work without specific alarm Positive (+) connection missing...

  • Page 59: Checking Relay Outputs

    Blast chiller Service Manual 3.7.1 Checking Relay Outputs The Touch Screen Controller is able to show actual state of relays through I/O menu explained at paragraph 2.3.3. Furthermore, the controller is able to force relay to activate and check if they are actually closing: go to SERVICE/SCANNER Rev 07/04/2015...
  • Page 60 Press the PLAY button to activate relay 1 (U1). After pressing the PLAY button, below “LOAD U1 ON” will appear. The relay #1 (output N-U1 on the relay board) will be excited. Wait few seconds until the power board will feed a signal back to the display to prove that the relay is actually closed (U1 will become red and STATUS will change to ON).
  • Page 61 Blast chiller Service Manual Meanwhile the power consumption on that relay output will appear in the row ENERGY, to monitor if there is any absorption by the component supplied by relay 1 and how much the absorption is. NOTE: When using an additional contactor or power relay connected on the power board, the power absorption will not show the actual power pulled by the electrical load connected with that contactor or power relay.

  • Page 62: Display - Touch Screen Version

    3.8. DISPLAY – TOUCH SCREEN VERSION USB PORT FRONT SIDE The RS485 port on the relay board is used to connect the keyboard. RS485 BACK SIDE RS485 CONNECTION ON RELAY BOARD CONNECTION ON DISPLAY 3.8.1 Touch Screen Display Troubleshooting Correct communication between Display and Power Board can be monitored by looking at signals Ext/Int on the left bottom side of the Display.

  • Page 63: Refrigerant Pressures Checks

    Blast chiller Service Manual 3.9. REFRIGERANT PRESSURES CHECKS High or Low refrigerant pressure levels are dependent on: • Ambient temperature • Heat load in the cabinet (Full or Empty) • Status of the cycle (hot food, frozen food etc.) • Cabinet temperature •...

  • Page 64: Service And Repair

    Service and Repair WARNING: Before performing any service that involves electrical connection or disconnection and/or exposure to electrical components, always follow the Electrical LOCKOUT/TAGOUT Procedure. Disconnect all circuits. Failure to comply cause property damage, injury death.This chapter deals with repairing/replacing instruction, of both mechanical and electrical components. REMOVE THE FRONT PANEL 4.1.1.

  • Page 65: Gbf-Gn2/3 (Smallest Self-Contained Unit)

    Blast chiller Service Manual 4.1.2 GBF-GN2/3 (smallest self-contained unit) a) Open the door. b) Remove the two screws on the door frame side of the panel. c) Remove the panel to access the condenser coil, keypad and door switch. Rev 07/04/2015...

  • Page 66: Latest Version Of Self-Contained (5 To 18 Pans) Effective June 2014

    4.1.3 Latest version of self-contained (5 to 18 pans) Effective June 2014 The latest version of Blast Chillers have a new snap-in front panel. No tools are required to remove the front panel. There is a removable and washable/cleanable condenser filter behind the front panel. Rev 07/04/2015...

  • Page 67: Reversing The Door Swing (Only Non Touch Screen)

    Blast chiller Service Manual 4.2. REVERSING THE DOOR SWING (ONLY NON TOUCH SCREEN) As long as there is no controller installed on the door, the door on each model can be reversed so that it is hinged on the right or left. Remove the front panel and look for the C-shaped bracket under the right side of the door.
  • Page 68 Unscrew the bracket and take it off by removing the hinge pin from the square hole. bracket and take it off by removing the hinge pin from the square hole. bracket and take it off by removing the hinge pin from the square hole. HINGE PIN SQUARED HOLE...
  • Page 69 Blast chiller Service Manual BOTTOM HINGE UPPER HINGE Remove the lower hinge pin and plastic bushing from the door. PLASTIC CAPS Remove the foam insulation from the upper door hole Rev 07/04/2015...
  • Page 70 Move the lower hinge and upper plastic bushing to the opposite ends of the ove the lower hinge and upper plastic bushing to the opposite ends of the ove the lower hinge and upper plastic bushing to the opposite ends of the door. BOTTOM HINGE PLASTIC CAPS PLASTIC CAPS...
  • Page 71 Blast chiller Service Manual NYLON BUSHINGS Move the C-shaped bracket from the opposite side and attach with the screws but do not tighten. Pay special attention to the positioning of the C-shaped bracket. LEFT SIDE FRAME BOTTOM PANEL (UNDER THE DOOR) The correct angle of the square hole will allow proper loading of the hinge spring when the door is closed, providing better sealing pressure on the gasket.

  • Page 72: Accessing The Condensing Unit

    4.3. ACCESSING THE CONDENSING UNIT 4.3.1 Unit from 5 to 18 shelves a) Remove the rear grid by unscrewing corner screws. b) Remove the front panel and unscrew the left and right side bolts from the compressor base plate at the sides of the condenser. c) Disconnect the keypad wires and loosen or cut the cable ties to extend the length to make clearance to slide out the compressor base.
  • Page 73 Blast chiller Service Manual e) Move the drain duct so that it will not interfere with sliding out the compressor base plate. f) Remove the caps from the corner stainless steel angles Rev 07/04/2015...
  • Page 74 INTERNAL EXTERNAL g) With the caps removed, loosen the inner screws. Do not remove them. This is done at a 45° angle to the back panel. 45° Rev 07/04/2015...
  • Page 75 Blast chiller Service Manual INSULATED INTERNAL HOOK PIPES (LOOSEN ONLY) EXTERNAL MOTHERSCREW h) Unscrew the right and left bolts from the compressor base plate Rev 07/04/2015...
  • Page 76 i) Lift the front edge of the base plate by pushing it forward to clear. ift the front edge of the base plate by pushing it forward to clear. ift the front edge of the base plate by pushing it forward to clear. j) From the rear, slide the From the rear, slide the base plate out as needed.

  • Page 77: Shelves Units

    Blast chiller Service Manual 4.3.2 5 shelves units These models do not come equipped with a sliding base plate for the condensing unit. All the components are mounted directly to a base plate which is part of the unit’s structure. The procedure for accessing these components is different from that for the model previously described.

  • Page 78: Gbf-3Gn2/3 (Smallest Self-Contained Unit)

    Keep the cabinet base in place and push the cabinet body from back to front enough to access the components. enough to access the components. 4.3.3 GBF-3GN2/3 (smallest self-contained unit) a) Unscrew the right side panel (3 screws) and side panel (3 screws) and the back right side panel (3 screws).

  • Page 79: Remote Units, Units Gbf20Gn2/1, Gbf40Gn2/1,Gbf20Gn1/1

    Blast ch Blast chiller Service Manual 4.3.4 Remote units, units Remote units, units GBF20GN2/1, GBF40GN2/1,GBF GBF20GN1/1 Remote units have the condensing unit in a separate box. To access the Remote units have the condensing unit in a separate box. To access the Remote units have the condensing unit in a separate box.
  • Page 80 DEFROST LINE TX BULB EVAPORATOR EQUALIZATION FEEDING LINE CIRCUIT TX VALVE BULB EVAPORATOR CAPILLARY OUTPUT LIQUID LINE TX VALVE DEFROST PROBE CABLE DEFROST PROBE BULB Rev 07/04/2015...

  • Page 81: Accessing The Evaporator

    Blast chiller Service Manual 4.4.2 Accessing the Evaporator Remove the screws that attach the hinged panel. Lift the panel up and remove it. 4.4.3 Replacing the Temperature Sensing Probes Cabinet Probe Remove the metal guard EXTERIOR VIEW INTERIOR VIEW Cut and remove the plastic mounting tie. remove the probe wires from the main control terminals.
  • Page 82 Evaporator Probe The evaporator probe bulb is located on the evaporator output tube, tighten by a plastic tie and wrapped by an aluminium tape. DEFROST PROBE CABLE DEFROST PROBE BULB Remove the insulation. Remove the aluminium tape. Cut and remove the plastic mounting tie. Cut off the probe bulb and all wire ties.
  • Page 83 Blast chiller Service Manual b) Remove the probe wires from the main control terminals. c) Attach the wires from the replacement probe wires to the wires of the existing probe. d) From the controller side, pull the wire of the existing probe to route the new probe wires correctly.

  • Page 84: Replacing The Evaporator Fan

    Close the panel. i) Reinstall the fan guard. 4.6. REPLACING THE DOOR SWITCH 4.6.1 GBF-3GN2/3 (smallest self-contained unit) a) Remove the front panel (see page 23). b) Remove door switch mounting screws. c) Disconnect the switch wires from terminals 48 & 49 on the main control.

  • Page 85: Replacing The Pressure Switch

    Blast chiller Service Manual b) Remove door switch mounting screws. c) Disconnect the switch wires from terminals 48 & 49 on the main control. d) Remove the switch. e) Reinstall new switch by reversing the above steps. SWITCH CABLES BOLT/NUT REPLACING THE PRESSURE SWITCH Occasionally the pressure switch can fail or become blocked and an “hP”...

  • Page 86: Replacing The Door Frame Heater

    REPLACING THE DOOR FRAME HEATER When a Door Frame Heater stops working, it could be a problem with the heater, such as an open element or a short. The problem could also be an interrupted power supply. Test the power supply before replacing the heater. Test the heater using the following specifications: 115V 220V...

  • Page 87: Replacing The Relay Board

    Blast chiller Service Manual Disconnect the wire leads and remove the defective heater. Insert the replacement heater in the channel and connect the wire leads. Replace the plastic cover strips and snap them in place by hand. REPLACING THE RELAY BOARD a) Disconnect the power supply.

  • Page 88: Replacing The Keypad

    a) Insert replacement board on clips, press down to snap in place. b) Rewire according to the wiring marking and wiring diagram. c) Ensure all parameters are set correctly (see Parameter List). 4.10 REPLACING THE KEYPAD a) Remove the front panel (3.1.) and unscrew the keypad b) Disconnect the wiring harness.

  • Page 89: Vacuum And Charge Procedure

    Blast chiller Service Manual VACUUM AND CHARGE PROCEDURE WARNING: Before performing any service that involves electrical connection or disconnection and/or exposure to electrical components, always follow the Electrical LOCKOUT/TAGOUT Procedure. Disconnect all circuits. Failure to comply can cause property damage, injury or death.This chapter deals with Repairing/replacing instruction, of both mechanical and electrical Components.

  • Page 90: Remote Models

    5.1.2 Remote Models Attach vacuum pump to the compressor check pressure valve and liquid receiver valve (shown above). A split evaporator unit is also equipped with one or more additional valves that can be used to pull a vacuum and charge the system. This valve can be used to pull a vacuum in the evaporator unit in two ways: 1.

  • Page 91: Schematics

    Blast chiller Service Manual SCHEMATICS SCHEME OF COMPONENTS Rev 07/04/2015...

  • Page 92: Airflow Requirements

    AIRFLOW AIRFLOW REQUIREMENTS 6.2.1 Self Contained Self Contained - Airflow Requirements Airflow Requirements BACK SIDE FRONT SIDE FRONT SIDE flow flow ev 07/04/2015...

  • Page 93: Remote - Airflow Requirements

    Blast chiller Service Manual Clearance 6.2.2 Remote - Airflow Requirements CONDENSER BOX CONDENSER BOX ELECTRICAL TOP VIEW CONNECTION flow REFRIGERANT CONNECTION Rev 07/04/2015...
  • Page 94 Installation requirement In most of the cases the condenser box is installed in the condenser box is installed in a false ceiling. Better than a Better than a minimum clearance, an extraction fan is recommended for those ambient where the n extraction fan is recommended for those ambient where the n extraction fan is recommended for those ambient where the temperature may exceed 43°C(110°F).

  • Page 95: Connection Of Remote Cabinet To "Non-Desmon" Condensing Unit

    Blast chiller Service Manual CONNECTION OF REMOTE CABINET TO “NON-DESMON” CONDENSING UNIT Blast Chiller cabinets without condensing unit can be connected to a remote existing condensing unit or a centralized system. 6.3.1 Connection with existing refrigerant lines A feeding valve is already installed on the box of the cabinet, behind the liquid line quick connection.

  • Page 96: Hook The Electrical Power To The Unit

    6.3.2 Hook the electrical power to the unit The Blast Chiller cabinet requires electrical power for the evaporator fans (4 or 5 for a single rack model), electronics controller, feeding valve, frame heater and similar. All the mentioned components are single phase, therefore the unit requires only two hot lines (or 1 line and neutral, depending on the mains voltage).
  • Page 97 Blast chiller Service Manual Rev 07/04/2015...

  • Page 98: How To Read The Model Number

    I. HOW TO READ THE MODEL NUMBER This manual applies to all the models in the table below. The models can be identified as follows: MODEL NUMBER CHILLING OUTPUT* FREEZING OUTPUT** UNIT TYPE*** GBF-3GN2/3 GBC-5G NO FREEZING GBF-5G GBF-5G+ GBF-5P GBF-5P+...

  • Page 99: Data Chart Table

    Blast chiller Service Manual II. DATA CHART TABLE MODEL VOLT/FREQUENCY GBF-3GN2/3 230V/50 Hz/1Ph 2,5 R404A 0,500 GBC-5G 230V/50 Hz/1Ph 6,0 R404A 0,850 230V/50 Hz/1Ph 6,0 R404A 0,850 GBF-5G 230V/50 Hz/1Ph 8,0 R404A 0,850 GBF-5G+ 230V/50 Hz/1Ph 6,0 R404A 0,850 GBF-5P...
  • Page 100 Rev 07/04/2015...

This manual is also suitable for:

Gbc-5gGbf-5gGbf-5pGbc-7Gbf-7Gbf-10 ... Show all

Table of Contents

Save PDF