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Bosch LV048 - User Manual

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

Table of Contents

Questions and Answers

  • G
    Gregory BurnsSep 17, 2025
    What to do if the fan is not working on my Bosch LV048 Heat Pump with a PSC motor?
    • B
      Brittany ParkSep 17, 2025
      If the fan on your Bosch Heat Pump isn't working (PSC motor), first check the supply voltage from the fan relay to the motor and ensure that all motor wires are secure. With the power off, spin the motor shaft; noise, resistance, or uneven motion can indicate motor failure. Also, check for 24 VAC across the fan relay coil and check all wiring connections. If the relay coil is energized but the relay does not pull in, check the resistance across the relay coil; an open circuit indicates a faulty relay.
  • A
    Anita McneilSep 10, 2025
    What to do if the compressor is not working but the fan runs on my Bosch LV048 Heat Pump, and it might be related to low pressure?
    • C
      Carol ParsonsSep 10, 2025
      If your Bosch Heat Pump compressor isn't working but the fan is running, a low-pressure fault may be the cause. Make sure that the fan motor is operating properly. Check the air filter, inspect the air coil for dirt/debris, and check the duct work to ensure dampers are not closed or blocked. Also, low refrigerant could be the cause, so check the refrigerant pressure with a gauge set.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • R
    Richard FrySep 23, 2025
    What causes water hammer in my Bosch LV048 Heat Pump and how to fix it?
    • S
      Steven DavisSep 23, 2025
      If you're experiencing water hammer with your Bosch Heat Pump, the cause may be fast closing valves. In this case, change the valves to a slow-close type.
  • K
    Kevin MaySep 18, 2025
    What to do if the fan is not working on my Bosch LV048 with a constant torque motor?
    • R
      Ryan ThomasSep 18, 2025
      If the fan on your Bosch Heat Pump isn't working (constant torque motor), check for 24 VAC between 'G' and 'C', and inspect all wiring connections. Also, check all wiring connections at the motor and control box. Check the supply voltage to the motor and ensure that all motor wires are secure. With the power off, spin the motor shaft; noise, resistance, or uneven motion can indicate motor failure.
  • H
    hensleygloriaSep 9, 2025
    Why is my Bosch Heat Pump causing high humidity?
    • E
      Erica ReedSep 9, 2025
      If your Bosch Heat Pump exhibits high humidity, several factors could be the cause. First, high air flow may be the problem; in this case, consult the blower performance table and reduce fan speed if possible. Second, there might be a loss of refrigeration capacity, so check refrigerant pressures with a gauge set. Third, short cycling could be the reason; check unit performance against building load calculations. Finally, a poorly located thermostat can contribute to high humidity; ensure that the thermostat is not located near a supply air duct.

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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