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Bosch LV048 - User Manual

Bosch LV048
64 pages
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Installation and Maintenance Manual
LV MODEL
8733944336 (2016/09)

Table of Contents

Questions and Answers

  • D
    Danielle MorenoSep 7, 2025
    How to troubleshoot a Bosch LV048 Heat Pump with no compressor operation but running fan, possibly due to blocked return air?
    • M
      Mr. Luis PhelpsSep 7, 2025
      If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a condensate fault caused by blocked return air. Check the condensate pan for a high water level. Also, check the air filter and return air duct work for blockage, and ensure there is adequate space between the return air opening and any obstructions.
  • V
    Vanessa MendezAug 22, 2025
    Why is my Bosch LV048 Heat Pump not shifting into cooling?
    • N
      Nicholas KerrAug 22, 2025
      If your Bosch Heat Pump isn't shifting into cooling mode, check that the reversing valve solenoid is receiving 24 VAC. If it is, check the resistance of the solenoid; an open circuit may indicate a burned out solenoid. Also, check that the reversing valve thermostat wire is connected to the 'O' terminal of the thermostat and check for a contact closure between 'O' and 'R'. Finally, check that the wires from the thermostat to the unit are securely connected and that the wires from the electrical box to the reversing valve are connected.
  • C
    Cynthia VazquezSep 4, 2025
    What to do if the compressor of my Bosch Heat Pump doesn't work but the fan runs and there is a freeze fault caused by low refrigerant?
    • S
      sara09Sep 4, 2025
      If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a freeze fault in the air coil caused by low refrigerant. Check the refrigerant pressure with a gauge set.
  • D
    Dr. David Murphy Jr.Sep 3, 2025
    How to troubleshoot a Bosch LV048 with no compressor operation but running fan, possibly due to a bad thermostat connection?
    • N
      nicole51Sep 3, 2025
      If the compressor of your Bosch Heat Pump is not working, but the fan is running, it might be due to a brown-out fault caused by a bad thermostat connection. Check that the thermostat wiring is of the proper gauge and length, is undamaged, and that all connections at the thermostat and heat pump are secure.
  • J
    Jean ScottSep 1, 2025
    What to do if my Bosch Heat Pump compressor isn't running but the fan is on and I suspect an overloaded control circuit?
    • O
      ojenningsSep 2, 2025
      If the compressor of your Bosch Heat Pump is not working, but the fan is running, it might be due to a brown-out fault caused by an overloaded control circuit. Check the control voltage; if it's below 18V, inspect the accessories connected to the unit and ensure they don't exceed the VA draw.
  • A
    Anthony WilliamsAug 31, 2025
    Why is my Bosch Heat Pump compressor not running but the fan is, possibly due to low airflow?
    • C
      carla52Aug 31, 2025
      If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a low-pressure fault caused by no or low airflow. Check the fan motor to ensure it is operating correctly.
  • B
    Barbara PetersonAug 30, 2025
    What to do if my Bosch LV048 compressor isn't running but the fan is, and I suspect airflow issues?
    • S
      Steven DavisAug 30, 2025
      If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a high-pressure fault caused by no or low airflow. Check the fan motor to ensure it is operating correctly.
  • M
    Michael PerezAug 29, 2025
    How to troubleshoot a Bosch LV048 with no compressor operation but running fan, possibly due to a fouled water coil?
    • V
      Vicki GrossAug 29, 2025
      If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a high-pressure fault caused by a fouled or scaled water coil. Check for proper flow rate and water temperature, especially looking for a low water side temperature rise during cooling.
  • R
    rphillipsAug 27, 2025
    Why is my Bosch LV048 compressor not running but the fan is, possibly due to high water temperature?
    • R
      ronald20Aug 27, 2025
      If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a high-pressure fault caused by high water temperature. Check the water temperature to ensure it is within the appropriate range.
  • S
    smithmeganAug 27, 2025
    What to do if the compressor of my Bosch LV048 Heat Pump doesn't work but the fan runs and there is a freeze fault?
    • S
      Shane MillsAug 27, 2025
      If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a freeze fault in the water coil caused by no or low water flow. Check the water valves and/or pumps to ensure they are operating correctly. Also, check the water coil for any blockages.

Summary

KEY TO SYMBOLS

Warnings and Safety Precautions

Defines risk keywords and provides safety instructions for installation and servicing.

INSTALLATION GUIDE

Piping and Electrical Wiring

Details on water piping connections and high voltage wiring, compliance with codes.

Field Controls and UPM Board Wiring

Safety Features and Reset Procedures

Explanation of safety features, UPM board functions, freeze protection, and reset procedures.

UNIT START-UP AND PRE-OPERATION

Pre-Start-Up Checks and Procedures

Checklist of pre-startup checks, coil cleaning, startup procedure, and operating limits.

Compressor Rotation and Startup

Procedures to check compressor rotation and verify startup parameters.

SEQUENCE OF OPERATION

ECM CONTROL BOARD DE-HUMIDIFICATION

UNIT STARTUP MODES

Cooling and Heating Mode Startup

APPLICATION CONSIDERATIONS

Antifreeze and Freeze Protection

WATER QUALITY MANAGEMENT

UNIT OPTIONS OVERVIEW

FAN MOTOR OPTIONS

TROUBLESHOOTING

Unit Troubleshooting Guide

Table detailing problems, checks, causes, and actions for unit troubleshooting.

OPERATING DATA

WIRING DIAGRAMS

DIMENSIONAL DRAWINGS

MAINTENANCE AND OPERATION

Maintenance Procedures

Guidance on filter changes, annual checkups, and condensate drain maintenance.

Bosch LV048 Specifications

General IconGeneral
CategoryHeat Pump
ManufacturerBosch
ModelLV048
Phase1
RefrigerantR-410A
Cooling Capacity48000 BTU/h
Heating Capacity48000 BTU/h
Voltage208/230V

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