Bosch SV018 User Manual (English)

Questions and Answers:

M
Mr. Thomas Johnson MDAug 18, 2025
How to reduce noise levels from my Bosch SV018 Heat Pump?
- V
  virginia91Aug 18, 2025
  To reduce objectionable noise levels from your Bosch Heat Pump, consider the following: Ensure the duct work and grilles are properly sized for the unit's air flow. If the fan speed is too high, consult the blower performance table and reduce it if possible. Make sure the unit is mounted on a full vibration pad. Ensure the unit is installed correctly and adjust the unit location to prevent it from touching the structure.
Q
qsmithAug 20, 2025
Why is my Bosch SV018 compressor so noisy?
- M
  maria32Aug 20, 2025
  If your Bosch Heat Pump compressor is noisy, it could be due to high water temperature or low water flow rate, which elevates the head pressure. If possible, increase the water flow rate and/or reduce the water temperature. Another cause could be a scaled or fouled water coil, which also elevates the heat pressure; in this case, clean/descale the water coil. Low air flow can also cause compressor noise, so check the filter and increase fan speed.
A
Austin HouseAug 23, 2025
Why is the fan not working on my Bosch SV018 with a constant airflow motor?
- P
  peter57Aug 23, 2025
  If the fan on your Bosch Heat Pump with a constant airflow motor isn't working, check the following: Ensure there's a fan operation signal by checking for 24 VAC between "G" and "C", and verify all wiring connections, including the thermostat connection plug. Inspect for loose wiring at the motor and control box, ensuring power and control harnesses are securely connected. Examine the interface board for damage and ensure all DIP switches are in the correct configuration. Finally, check the supply voltage to the motor, ensure all motor wires are secure, and test the motor by moving the "TEST" DIP switch to "ON" and the other switches to "OFF" on the "ADJUST" switch block on the interface board.
A
Angela SimpsonAug 26, 2025
What to check if the fan isn't working on my Bosch SV018 with a constant torque motor?
- A
  Andres MartinezAug 26, 2025
  If the fan isn't working on your Bosch Heat Pump with a constant torque motor, first check for a fan operation signal by ensuring there is 24 VAC between "G" and "C", and check all wiring connections. Also, inspect for loose wiring at both the motor and the control box. Finally, check the supply voltage to the motor, make sure all motor wires are secure, and with the power off, spin the motor shaft to check for noise, resistance, or uneven motion, which could indicate motor failure.
L
Lindsay DanielAug 28, 2025
How do I troubleshoot a Bosch SV018 fan that isn't working (PSC motor)?
- M
  Melanie BurnsAug 28, 2025
  To troubleshoot a Bosch Heat Pump fan that isn't working and uses a PSC motor, start by checking the supply voltage from the fan relay to the motor and ensure all motor wires are secure. Next, check for a fan operation signal by verifying 24 VAC across the fan relay coil and inspecting all wiring connections. If the relay coil is energized but the relay doesn't pull in, check the resistance across the relay coil, as an open circuit indicates a faulty relay. With the power off, spin the motor shaft to check for noise, resistance, or uneven motion, which can indicate motor failure.
S
Sean DoyleAug 30, 2025
Why is there high humidity with my Bosch SV018 Heat Pump?
- J
  jordankellyAug 30, 2025
  High humidity with your Bosch Heat Pump may be due to several reasons. The fan speed setting might be too high, so consult the blower performance table and reduce the fan speed if possible. There could be low refrigerant levels, so check the refrigerant pressures with a gauge set. The unit might be oversized for the space, so check the unit performance against building load calculations. Also, the thermostat might be poorly located, such as near a supply air duct; relocate it if necessary.
N
Nathaniel MayoSep 2, 2025
What to do if my Bosch Heat Pump has excessively warm air in cooling or cool air in heating?
- C
  Christopher BennettSep 2, 2025
  If your Bosch Heat Pump is producing excessively warm air during cooling or excessively cool air during heating, several factors could be responsible. The fan speed setting may be too high; if so, consult the blower performance table and reduce the fan speed if possible. The inlet water temperature may be out of range; check the unit capacity versus the water temperature. Leaky duct work could also be a factor, so inspect the duct work. Finally, low refrigerant levels can cause this issue, so check the refrigerant pressures with a gauge set.
T
troy39Sep 4, 2025
Why is my Bosch SV018 Heat Pump blowing excessively cold air in cooling or hot air in heating?
- C
  Christine BatesSep 5, 2025
  If your Bosch Heat Pump is blowing excessively cold air in cooling mode or excessively hot air in heating mode, start by replacing the dirty filter. Also, the fan speed might be too low; consult the blower performance table and increase the fan speed if possible. Lastly, excessive duct pressure drop could be the issue; consult the blower performance table and increase the fan speed if possible to compensate.
T
tammymillerSep 9, 2025
Why won't my Bosch SV018 Heat Pump switch to cooling mode?
- P
  Patricia ColonSep 9, 2025
  If your Bosch Heat Pump isn't shifting into cooling mode, there are a few things you can check. First, see if the reversing valve solenoid is receiving 24 VAC; if it is, check the solenoid's resistance, as an open circuit may indicate a burned-out solenoid. Next, check that the reversing valve thermostat wire is connected to the "O" terminal of the thermostat and that there's a contact closure between "O" and "R". Lastly, make sure the wires from the thermostat to the unit and from the electrical box to the reversing valve are securely connected.
A
Angelica GomezSep 12, 2025
What to do if my Bosch Heat Pump compressor and fan aren't working?
- C
  changjoshuaSep 12, 2025
  If neither the compressor nor the fan is operating on your Bosch Heat Pump, first ensure that the supply voltage to the unit is within the range shown on the unit data plate. Then, check for 24 VAC between "R" and "C" on the unit terminal block to verify the control transformer is functioning. For 75 and 100 VA transformers, check that the transformer circuit breaker has not tripped. Before replacing the transformer, check the low voltage circuit for overload conditions or short circuits.

Bosch SV018 Specifications

General

Brand	Bosch
Model	SV018
Category	Heat Pump
Language	English

Summary

Model Nomenclature

Model Number Components

Breakdown of each element within the SV series model number designation.

General Description

Safety Considerations

Crucial safety warnings and precautions for installation and servicing.

Moving and Storage

Initial Inspection Procedures

Procedures for checking unit condition and contents upon arrival.

Unit Location Guidelines

Guidelines for selecting an appropriate indoor installation site.

Water Quality Information

Water Quality Notes

Important note on ensuring proper water quality for unit longevity and warranty.

Installation Procedures

Duct Flange Details

Details on fold-out flanges for easier installation and access.

Mounting Vertical Units

Instructions for leveling and placing vertical units on vibration pads.

Mounting Horizontal Units

Guidance on suspending horizontal units using threaded rods.

Hanging Bracket Kit Installation

Bracket Kit Installation Instructions

Steps for installing hanging brackets for suspended unit mounting.

Horizontal Air Configuration

Condensate Connections

Requirements for connecting the condensate drain line and trap.

Duct System Requirements

Information on return air duct flanges and supply air connections.

Piping Guidelines

Electrical Systems

High Voltage Wiring

Detailed instructions for high voltage power supply connections.

Low Voltage Wiring

Instructions for low voltage control and thermostat wiring.

Unit Controls - UPM

ECM Interface Board

Description of the ECM interface board and its connections.

Thermostat Options

Table listing available thermostat connection options and their functions.

UPM Operation and Safety

Dehumidification Method Selector

Selection guide for unit dehumidification modes.

UPM Safety Features Overview

Overview of safety controls integrated into the Unit Protection Module.

UPM Sensors and Protection

Details on freeze and overflow protection sensors.

UPM Configuration and Faults

UPM DIP switch settings, fault codes, and board features.

UPM Operation and Resets

Procedures for test switch, freeze sensor adjustment, and resets.

Optional Features

Extended Range Option

Details on the extended range option for extreme fluid temperatures.

Unit Mounted Disconnect Switch

Description of the optional disconnect switch for power control.

Hot Gas Reheat

Explanation of the hot gas reheat option for dehumidification.

DDC Controls

Information on Direct Digital Control options for advanced integration.

Internal 2-Way Water Valve

Details on the factory-mounted motorized water valve option.

Application Considerations

Boiler/Cooling Tower Systems

Guidance on using units with boiler and cooling tower systems.

Geothermal Closed Loop Systems

Requirements for operating units in geothermal closed loop applications.

Certified Performance Table

Performance Table Notes

Clarifications on GLHP ratings and ECM motor types.

Fan Motor Options and Performance

Permanent Split Capacitor (PSC) Motors

Details on the standard PSC motor and its performance data.

Electronically Commutated Motors (ECM)

Information on ECM motor options and their performance data.

Standard Blower Motor Specifications

Constant Torque ECM Blower Motor

Constant CFM ECM Blower Motor

Unit Start Up Procedure

Maintenance Schedule

Unit Check Out Sheet

Bosch Group Contact Information

Contact details for Bosch Group technical support.

Troubleshooting Guide

Fan Runs, Compressor Does Not

Troubleshooting steps for when the fan runs but the compressor does not.

No Compressor or Fan Operation

Steps to diagnose when neither compressor nor fan operates.

No Fan Operation (PSC Motor)

Troubleshooting for PSC motor failure to operate.

No Fan Operation (Constant Torque Motor)

Troubleshooting for ECM constant torque motor failure to operate.

No Fan Operation (Constant Airflow Motor)

Troubleshooting constant airflow ECM motor non-operation.

Unit Not Shifting Into Cooling

Diagnosing why the unit fails to switch to cooling mode.

Incorrect Supply Air Temperatures

Resolving issues with supply air temperatures being too high or low.

High Humidity Issues

Troubleshooting causes of high humidity within the conditioned space.

Objectionable Noise Levels

Diagnosing and resolving noise issues like air noise, structure-borne noise, and water hammer.

Operating Data Tables

Temperature/Pressure Tables

Tables showing operating data for various models under different conditions.

Waterside Pressure Drop and Coil Volume

Data on pressure drops and water coil volumes for different models.

Compressor Characteristics

Corner Weights (HZ)

Wiring Diagrams

Dimensional Drawings

Vertical Unit Dimensions

Dimensional drawings and specifications for vertical unit configurations.

Horizontal Unit Dimensions

Dimensional drawings and specifications for horizontal unit configurations.

Counter-Flow Unit Dimensions

Dimensional drawings and specifications for counter-flow unit configurations.

Notes Section

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Bosch SV018 User Manual

Table of Contents

Questions and Answers:

Bosch SV018 Specifications

Summary

Model Nomenclature

Model Number Components

General Description

Safety Considerations

Moving and Storage

Initial Inspection Procedures

Unit Location Guidelines

Water Quality Information

Water Quality Notes

Installation Procedures

Duct Flange Details

Mounting Vertical Units

Mounting Horizontal Units

Hanging Bracket Kit Installation

Bracket Kit Installation Instructions

Horizontal Air Configuration

Condensate Connections

Duct System Requirements

Piping Guidelines

Electrical Systems

High Voltage Wiring

Low Voltage Wiring

Unit Controls - UPM

ECM Interface Board

Thermostat Options

UPM Operation and Safety

Dehumidification Method Selector

UPM Safety Features Overview

UPM Sensors and Protection

UPM Configuration and Faults

UPM Operation and Resets

Optional Features

Extended Range Option

Unit Mounted Disconnect Switch

Hot Gas Reheat

DDC Controls

Internal 2-Way Water Valve

Application Considerations

Boiler/Cooling Tower Systems

Geothermal Closed Loop Systems

Certified Performance Table

Performance Table Notes

Fan Motor Options and Performance

Permanent Split Capacitor (PSC) Motors

Electronically Commutated Motors (ECM)

Standard Blower Motor Specifications

Constant Torque ECM Blower Motor

Constant CFM ECM Blower Motor

Unit Start Up Procedure

Maintenance Schedule

Unit Check Out Sheet

Bosch Group Contact Information

Troubleshooting Guide

Fan Runs, Compressor Does Not

No Compressor or Fan Operation

No Fan Operation (PSC Motor)

No Fan Operation (Constant Torque Motor)

No Fan Operation (Constant Airflow Motor)

Unit Not Shifting Into Cooling

Incorrect Supply Air Temperatures

High Humidity Issues

Objectionable Noise Levels

Operating Data Tables

Temperature/Pressure Tables

Waterside Pressure Drop and Coil Volume

Compressor Characteristics

Corner Weights (HZ)

Wiring Diagrams

Dimensional Drawings

Vertical Unit Dimensions

Horizontal Unit Dimensions

Counter-Flow Unit Dimensions

Notes Section

Related product manuals