Bosch LV048 User Manual

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Installation and Maintenance Manual

LV MODEL

8733944336 (2016/09)

Table of Contents

Questions and Answers:

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.
T
Terrance WhitneyAug 23, 2025
How to reduce objectionable noise levels from my Bosch LV048?
- B
  Brent WalkerAug 23, 2025
  If you're experiencing objectionable noise levels from your Bosch Heat Pump, ensure the duct work and grilles are properly sized for unit air flow. If the fan speed setting is too high, consult the blower performance table and reduce fan speed if possible. To address structure borne noise, mount the unit on a vibration pad. Also, install the unit in accordance with the provided instructions and adjust the unit location to prevent it from touching the structure.
M
michaelhunterAug 25, 2025
What to do if my Bosch LV048 Heat Pump compressor isn't running and the fan is on, but I suspect low refrigerant?
- M
  Miguel LopezAug 26, 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 low refrigerant. Check the refrigerant pressure with a gauge set.
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.
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.
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.
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.

Bosch LV048 Specifications

General

Category	Heat Pump
Manufacturer	Bosch
Model	LV048
Phase	1
Refrigerant	R-410A
Cooling Capacity	48000 BTU/h
Heating Capacity	48000 BTU/h
Voltage	208/230V

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.

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