1. Manuals
  2. Brands
  3. Bergstrom Manuals
  4. Fan
  5. Dual Zone Front HVAC
  6. Service manual

Bergstrom Dual Zone Front HVAC Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Recreational Vehicle
Dual Zone Front HVAC
Service Manual
Updated: 9/6/2023
Note (Not applicable for hard copies):
are "hyperlinks" that allow user to jump directly to the respective section. Hold
1. Phrases in
blue
"ctrl" and click the link to use.
2. All section titles are "hyperlinks" allowing the user to jump back to the top of the document.
2390 Blackhawk Road ● P.O. Box 6007 ● Rockford, IL 61125 ●
● 1-866-204-8570
www.bergstrom.com

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the Dual Zone Front HVAC and is the answer not in the manual?

Questions and answers

Related Manuals for Bergstrom Dual Zone Front HVAC

Summary of Contents for Bergstrom Dual Zone Front HVAC

  • Page 1 Recreational Vehicle Dual Zone Front HVAC Service Manual Updated: 9/6/2023 Note (Not applicable for hard copies): are “hyperlinks” that allow user to jump directly to the respective section. Hold 1. Phrases in blue “ctrl” and click the link to use.

  • Page 2: Table Of Contents

    Table of Contents Page Service • Contact Information • Request for Technical Support, Questionnaire • Comments Electrical Systems • Electrical Schematics • Diagnostic Guide Air Flow Systems • Basic Description • Main HVAC System Components Component Servicing • Outdoor HVAC Unit •...
  • Page 3 • Compressor Function Test • Thermostatic Expansion Valve (TXV) Function Test • Refrigerant Charge Information • Service Tips • R134a Temperature/Pressure Chart Dual Zone Front HVAC Owner’s Manual • Control Panel Operation • Air Distribution • Operating Features • Warranty/Service...
  • Page 4 HVAC service personnel, who can ensure a safe and properly operating system. It is assumed that the user of this guide is trained and experienced in basic refrigeration principles, in addition to being familiar with Bergstrom HVAC systems installed on Recreational Vehicles. Technicians who repair or service motor vehicle A/C systems must be certified by Section 609 (MACS) approved by the EPA.

  • Page 5: Service

    Service Contact Information Address: Bergstrom HQ 2390 Blackhawk Road Rockford, IL 61109 Phone: (866) 204-8570 Website: www.bergstrominc.com...

  • Page 6: Request For Technical Support Questionnaire

    Request for Technical Support Questionnaire Open the front service door of the coach and verify if you are servicing a Bergstrom HVAC system by checking the base unit mounted on the front firewall. Verify customer complaint by operating the vehicle.

  • Page 7: Comments

    Service Comments...

  • Page 8: Electrical Systems

    Electrical Systems Electrical Schematics...

  • Page 9: Diagnostic Guide

    Electrical Systems Diagnostics Guide Problem Possible Cause Corrective Action 1. Vehicle ignition switch 1. Activate vehicle ignition switch. isn’t activated. 2. Examine the chassis’ HVAC circuit’s protection device for 2. Loss of power supply. failure (i.e. fuse or circuit breaker). 3.
  • Page 10 Electrical Systems Problem Possible Cause Corrective Action 1. Blower switch is not 1. Blower must be ON for A/C clutch A/C Clutch does not operate activated. to operate. 1. A/C switch is not 1. Verify A/C switch is depressed activated. and illuminating correctly.

  • Page 11: Air Flow Systems

    Air Flow Systems Basic Description The Bergstrom Dual Zone HVAC System for Jayco consists of four HVAC modules designed to provide air that has been conditioned to the occupants of the vehicle cockpit. The driver zone and passenger zone of the panel mode outlets can be controlled independently for air temperature and blower speed.

  • Page 12: Main Hvac System Components

    Air Flow Systems Main HVAC System Components Indoor HVAC Unit Passenger Zone Blower Blend Actuator Driver Zone Blend Actuator Heater Coil Outdoor HVAC Unit Evaporator Coil Freeze Probe Fresh Air Filter Recirculation Filter Fresh Air/Recirculation Actuator...
  • Page 13 Air Flow Systems Mode Box Driver Zone Panel Mode Actuator Defrost Mode Actuator Passenger Zone Panel Mode Actuator Floor Mode Actuator Condenser Assembly Condenser Fan Condenser Coil...

  • Page 14: Component Servicing

    Component Servicing Outdoor HVAC Unit Outdoor HVAC Unit Removal 1. Discharge A/C system. Refer to REFRIGERANT CHARGE INFORMATION 2. Remove any hoses/fittings connected to the TXV and the front mounting plate by removing the 1 Allen screw. 3. Disconnect the actuator harness and freeze probe harness. 4.

  • Page 15: Indoor Hvac Unit

    Component Servicing Indoor HVAC Unit Indoor HVAC Unit Removal 1. Remove outdoor HVAC unit. Refer to OUTDOOR HVAC UNIT 2. Drain engine coolant from heater core and connected heater hoses. NOTE – Before removing heater hoses, label hoses to ensure correct installation. 3.

  • Page 16: Freeze Probe

    Component Servicing Freeze Probe Freeze Probe Removal 1. Remove outdoor HVAC unit. Refer to OUTDOOR HVAC UNIT 2. Gently pull freeze probe out of the face of the evaporator, noting probe depth and location of indentation left behind. 3. Remove rubber grommet from side of HVAC module and from freeze probe. 4.

  • Page 17: Fresh And Recirculation Air Filters

    Component Servicing Fresh and Recirculation Air Filters Fresh or Recirculation Air Filter Removal 1. Identify outdoor HVAC unit. It is the unit with the TXV. 2. Remove 1 screw and slide cover tabs out of slots. 3. Remove filter by pulling straight out of the door. Fresh or Recirculation Air Filter Installation 1.

  • Page 18: Actuator(S)

    Component Servicing Actuator(s) Actuator Removal 1. Depending on actuator location, removal of outdoor or indoor unit may be necessary. Refer to OUTDOOR HVAC UNIT INDOOR HVAC UNIT 2. Disconnect electrical connector from the specific actuator that is being replaced (passenger zone blend door actuator shown for reference).

  • Page 19: Evaporator Coil

    Component Servicing Evaporator Coil Evaporator Coil Removal 1. Remove outdoor HVAC unit. Refer to OUTDOOR HVAC UNIT 2. Remove evaporator access cover from the HVAC module by removing 6 nuts. 3. Remove freeze probe. Refer to FREEZE PROBE 4. Slide evaporator-TXV subassembly out of the HVAC module. Evaporator Coil Installation 1.

  • Page 20: Heater Core

    Component Servicing Heater Core (Indoor HVAC Unit) Heater Core Removal 1. Remove outdoor HVAC unit. Refer to OUTDOOR HVAC UNIT 2. Remove heater access cover from indoor HVAC unit by removing 3 nuts. 3. Remove and retain rubber grommet from heater tubes and service cover. 4.

  • Page 21: Blower Assembly

    Component Servicing Blower Assembly (Indoor HVAC Unit) Blower Assembly Removal 1. Remove outdoor HVAC unit. Refer to OUTDOOR HVAC UNIT 2. Remove indoor HVAC unit. Refer to INDOOR HVAC UNIT 3. Disconnect electrical connection for the blower. 4. Pull on blower connector to separate it from blower access cover. 5.

  • Page 22: Condenser Fan

    Component Servicing Condenser Fan Condenser Fan Removal 1. Disconnect electrical connection between vehicle wiring harness and fan connector. 2. Cut and remove wire tie holding fan wires to tie-mount. 3. Remove fan with 4 screws. Condenser Fan Installation 1. Secure fan using 4 screws (2.3 Nm Torque). 2.

  • Page 23: Condenser Coil

    Component Servicing Condenser Coil Condenser Coil Removal 1. Discharge A/C system. Refer to REFRIGERANT CHARGE INFORMATION 2. Disconnect hoses connected to condenser coil inlet and outlet. 3. Remove condenser assembly from vehicle with 4 screws. 4. Remove condenser coil from condenser assembly with 4 nuts. Condenser Coil Installation 1.

  • Page 24: Thermostatic Expansion Valve (Txv)

    Component Servicing Thermostatic Expansion Valve (TXV) TXV Removal 1. Discharge A/C System. Refer to REFRIGERANT CHARGE INFORMATION 2. Remove any attached hoses/fittings connected to TXV and front mounting plate by removing 1 Allen screw. 3. Remove 2 Allen screws from the expansion valve body. Remove and retain rear locking plate. 4.

  • Page 25: Other Serviceable Components

    Component Servicing Other Serviceable Components HVAC Control ECU (Electronic Control Unit) Ducting Louver...
  • Page 26 Component Servicing Binary Switch Receiver Dryer Wire Harness...
  • Page 27 Component Servicing Vent Refrigerant Hose Condenser to Dryer Discharge Dryer to Evaporator Suction...

  • Page 28: Air Conditioning System

    Air Conditioning System Safety Precautions & Warnings Servicing Refrigerant Systems: 1. Always wear the proper protective eyewear and clothing before working on any refrigeration system. Remember, refrigerant in the air conditioning system can reach pressures of over 500 PSI – if one of those lines bursts while you’re working on the system, it can cause serious injury.

  • Page 29: Diagnostic Guide

    Air Conditioning System Diagnostic Guide Problem Possible Causes Corrective Action 1. Temperature control knob 1. Turn temperature control to not adjusted to cold far full cold. enough. 2. Run A/C SYSTEM 2. Incorrect refrigerant charge OPERATION CHECK. in system. If charge is Verify the system has the excessively low or high, proper refrigerant charge...
  • Page 30 Air Conditioning System Problem Possible Causes Corrective Action 1. Excessive moisture in 1. Recover refrigerant. system which can cause Replace receiver/drier, add the expansion valve to 2 ounces of oil, evacuate Inadequate cooling during hot frost and restrict refrigerant the system, and recharge. part of the day flow.

  • Page 31: A/C System Operation Check

    The following is an A/C system "Field Test" and Evaluation Procedure to be used by service personnel. This procedure can be used to determine if a Bergstrom A/C system is performing properly and contains the correct refrigerant charge. The performance guidelines shown are approximate, and subject to many operational variables.

  • Page 32: Expected A/C Performance

    Air Conditioning System Expected A/C Performance The following performance guidelines are based on test conditions outlined under A/C System Operation Check. Variables such as engine speed, condenser airflow, sun load, blower motor, speed, and chassis voltage will all affect A/C system performance. Air Temperature (F) Entering A/C Unit Inlet - Outlet Air Temperature Differential** FRESH OR RECIRCULATED...

  • Page 33: Compressor Function Test

    These are general guidelines to check the compressor function as part of the AC system, consult the chassis manufacturer or the compressor supplier before any repair or replacements to the compressor. Bergstrom does not supply the compressor for RV A/C systems.

  • Page 34: Thermostatic Expansion Valve (Txv) Function Test

    Air Conditioning System Thermostatic Expansion Valve (TXV) Function Test TXV Operation The thermostatic expansion valve or TXV is an interactive device that senses pressure and temperature then adjusts refrigerant flow to maintain a given superheat. Do not replace this device unless its function has been properly tested.

  • Page 35: Refrigerant Charge Information

    3. Some refrigerant loss will occur in one year’s time, and this is recognized as normal. Vibration, hose porosity and general construction of the system make a leak prof system nearly impossible. 4. Bergstrom does not recommend or endorse the use of “Stop Leak” or “Leak Sealing” products.

  • Page 36: R134A Temperature/Pressure Chart

    Air Conditioning System R134a Temperature/Pressure Chart The numbers above represent the boiling points for R134a...
  • Page 37 Bergstrom Inc. Dual Zone A/C Heater Owner’s Manual Operating Instructions For additional owner and operator information visit us at www.bergstrominc.com WARNING This heater / air conditioner should be serviced by a fully trained and environmentally licensed technician. Failure to do the above could result in serious injuries, fines, and possible voiding of any warranties.

  • Page 38: Control Panel Operation

    Owner’s Manual Control Panel Operation Blower Speed Control Temperature Control Air Distribution Control A/C Clutch Recirculation Blower Speed Control One of the best ways of controlling temperature is by changing the speed of the blower. The blower switch controls the system on/off and provides several different speeds in any mode. Temperature Control The temperature control dial controls only the heat content of the discharge air.

  • Page 39: Air Distribution

    Owner’s Manual Air Distribution To achieve the maximum comfort in your vehicle, the air must be directed where it is needed. The mode switch (right of center) gives the user the ability to select where the air will flow. – Air is drawn into the system and discharged through the dash louvers Panel Mode only.

  • Page 40: Operating Features

    The A/C system is designed to operate in all air distribution modes. This provides significant moisture, dust, and pollen removal for enhanced passenger comfort. The Bergstrom vehicle A/C system will not function if the outside temperature is below approximately 40 degrees F. For cool air circulation during low temperatures, it is suggested the operator utilize fresh air mode.

  • Page 41: Warranty/Service

    The A/C system contains refrigerant 134a under high pressure and should be serviced by qualified personnel only. Repairs that alter the design of the Bergstrom system including the use of non- Bergstrom supplied parts will void the warranty and any Bergstrom liability for the system.

Table of Contents