Bosch SM024 - User Manual

Other manuals for Bosch SM024

Manual44 pages

Questions and Answers

D
daniel16Sep 16, 2025
What to do if the blower operates but the compressor does not in my Bosch Heat Pump?
- J
  Justin FisherSep 16, 2025
  If the blower in your Bosch Heat Pump is running but the compressor isn't, first check the thermostat's settings, calibration, and wiring. Inspect the safety controls for loose or broken wires at the compressor, capacitor, or contactor. If the compressor is cool and the overload won't reset, the compressor may need to be replaced. A compressor motor grounded internally to the shell also requires compressor replacement; if there's a compressor burnout, install a suction filter dryer. Finally, if the compressor windings are open after the compressor has cooled, check their continuity; if they're open, replace the compressor.
A
Amber MartinSep 18, 2025
Why does my Bosch SM024 Heat Pump unit short cycle?
- U
  ugarciaSep 18, 2025
  If your Bosch Heat Pump is short cycling, it could be due to several reasons. The unit might be oversized, requiring you to recalculate the heating or cooling loads. The thermostat could be installed near a supply air grill, in which case you should relocate it and readjust the heat anticipator. Also, check the wiring and controls for a defective or improperly calibrated low-pressure switch.
K
kingleroyNov 21, 2025
Why is my Bosch SM024 not running at all?
- J
  Joseph BrownNov 21, 2025
  Several factors could cause your Bosch Heat Pump to not run. First, check if the power supply is off and apply power or close the disconnect. A blown fuse could also be the culprit; replace the fuse or reset the circuit breaker, ensuring you use the correct fuses. If the voltage supply is low (below the minimum specified on the unit's data plate), contact your local power company. Finally, the thermostat might be faulty. To test this, set the fan to 'ON'—it should run. Then, set the thermostat to 'COOL' with the lowest temperature and then to 'HEAT' with the highest temperature. The unit should run in cooling and heating modes, respectively. If the blower or compressor doesn't run in any of these cases, the thermostat may be miswired or faulty. Verify 24 volts at the condensing section's l...
G
glovermichelleNov 23, 2025
What to do if my Bosch SM024 Heat Pump is not providing sufficient cooling or heating?
- T
  Timothy HarrisNov 23, 2025
  If your Bosch Heat Pump isn't providing enough cooling or heating, several issues could be the cause. First, the unit might be undersized, so recalculate the heating and cooling loads, and consider adding insulation and shading. Check for leaks in duct work or ambient air entering through doors or windows. Ensure adequate airflow and proper air distribution, replacing any dirty filters. A low refrigerant charge can also cause inefficient operation. Other potential causes include a defective compressor (check for low discharge and high suction pressure), a defective reversing valve, incorrect operating pressures (compare to the unit's pressure/temperature chart), a restricted or defective TXV, or contamination of the refrigerant system with moisture or non-condensables. In the last case, re...
E
Elizabeth PerezNov 26, 2025
How to troubleshoot entire Bosch SM024 Heat Pump unit that does not run?
- A
  abigailbaldwinNov 27, 2025
  If your entire Bosch Heat Pump unit isn't running, first ensure the power supply is on and the disconnect is closed. If that's not the issue, check for a blown fuse and replace it or reset the circuit breaker, making sure you're using the correct fuses. If the voltage supply is too low (below the minimum specified on the unit's data plate), contact your local power company. Finally, the issue may be with the thermostat. Set the fan to 'ON' to see if the fan runs. Then, set the thermostat to 'COOL' with the lowest temperature and then to 'HEAT' with the highest temperature to see if the unit runs in those modes. If the blower and compressor don't run in any of these cases, the thermostat may be miswired or faulty. Check that 24 volts is available on the condensing section's low voltage term...
J
Judy HuffDec 1, 2025
Why is my Bosch SM024 Heat Pump providing insufficient cooling or heating?
- C
  Charles MorrisDec 1, 2025
  If your Bosch Heat Pump isn't providing enough cooling or heating, several factors could be at play. First, ensure adequate airflow and proper air distribution, and replace any dirty filters. Check for leaks in the ductwork or ambient air entering through doors or windows. If the unit is undersized, recalculate the heating or cooling loads; adding insulation and shading might help. A low refrigerant charge can also cause inefficient operation, so check that. Other potential causes include a defective compressor (check if the discharge is too low and suction pressure is too high), a defective reversing valve, or a restricted or defective TXV. Compare unit operating pressures to the unit's pressure/temperature chart. Lastly, the refrigerant system may be contaminated with moisture or noncond...

Summary

Key to Symbols and Safety Warnings

Explanation of Warning Symbols

Details symbols and keywords indicating risk severity and type.

General Safety Warnings

Covers hazards during installation, servicing, and operation.

Standard Package Contents

Illustrates components included in the standard package.

Model Nomenclature and Unit Descriptions

Model Nomenclature Breakdown

Explains the coding system for SM series heat pumps.

General Unit Description

Provides an overview of unit features, certifications, and configurations.

Unit Configurations and Options

Details available configurations (VT, HZ, CF) and factory options.

Moving, Storage, and Location Guidelines

Moving and Storage Instructions

Provides guidelines for unit handling and storage.

Initial Inspection Procedures

Steps for inspecting units upon arrival for damage or shortages.

Unit Location Requirements

Specifies ideal indoor locations for installation and service access.

Unit Configurability and Reconfiguration

Horizontal Unit Blower Configuration

Instructions for changing blower orientation on horizontal units.

Left-Hand Unit Configuration Steps

Detailed steps for reconfiguring the left-hand unit blower.

Counter-Flow and Vertical Configurability

Details on configuring counter-flow and vertical units.

Blower Re-Configuration Process

Step-by-step guide for reconfiguring the blower assembly.

Condensate Drain Connection Re-configuration

Instructions for relocating the condensate drain connection.

HRP Switch Relocation

Procedure for relocating the HRP pump disconnect switch.

Electric Heat Relocation

Steps to relocate electric heat components for servicing.

Electrical Box Re-configuration

Procedure for removing and relocating the electrical box.

Installation Procedures and Mounting

Pre-Installation Unit Preparation

Instructions for corner cap installation.

Mounting Vertical Units

Guidelines for level mounting on vibration pads.

Hanging Bracket Kit Installation

Instructions for installing the hanging bracket kit.

Mounting Horizontal Units

Recommendations for surface and suspended mounting.

Condensate Drain Requirements

Details on drain line pitching and trap installation.

Duct, Piping, and Water Quality

Duct System Installation

Guidelines for supply and return air duct connections.

Piping Installation Guidelines

Recommendations for piping size, material, and connections.

Water Quality Considerations

Table detailing water characteristics for copper and cupro-nickel.

Electrical Connections and Safety Devices

Electrical Connections Overview

Details on conduit routing, ground lead, and power leads.

Safety Devices and UPM Controller

Explanation of UPM board, LEDs, and safety controls.

Thermostat Malfunction Light Connection

Instructions for connecting malfunction lights.

Freeze Protection Sensor Function

Details on evaporator and water side freeze protection.

UPM Board Factory Default Settings

Table of default settings for TEMP, LOCKOUT, RESET, ALARM, TEST.

UPM Board Features

Explanation of anti-short cycle and random start timers.

ECM Interface Board Functionality

Translates thermostat inputs for ECM motor control.

Dehumidification Method Selector

Selects between HGRH and fan-only dehumidification.

Motor Options and Features

Constant Torque Motors (ECM)

Description of ECM motors and their advantages.

Speed Tap Adjustment Instructions

Procedure for changing motor speed taps.

Available Unit Options

Hot Gas Reheat (HGRH) Option

Details on HGRH function, availability, and operation.

Electric Heat Option

Description of supplemental electric heat and its compatibility.

Heat Recovery Package (HRP) Option

Explanation of HRP purpose, components, and water heating capabilities.

DPS Water Flow Proving Option

Prevents compressor operation with inadequate water flow.

Pump Relay Option

Energizes supply pump or solenoid valve.

Comfort Alert Module Option

Troubleshooting module for heat pump system failures.

Smart Start Assist (SSA) Operation

Smart Start Assist Functionality

Reduces starting current, extends compressor life.

SSA Specifications

Details on voltage, range, protection, and current ratings.

Smart Start Assist Mode of Operation

Explains behavior during normal, undervoltage, and overcurrent conditions.

SSA Alarm Recovery Flashing

Indicates recovery mode status via red LED flashes.

Heat Recovery Package Installation

Water Tank Preparation Steps

Procedure for preparing the water tank for HRP connection.

HR Water Piping Installation

Requirements for hot water piping size and insulation.

Water Tank Refill Procedure

Steps for refilling the water tank after installation.

Tank Thermostat Adjustment

Guidance on setting thermostats for optimal heat utilization.

Initial Start-Up and Sequence of Operation

Initial Start-Up Procedures

Steps for safely starting the heat pump and HR pump.

Cooling Mode Sequence

Describes unit operation during cooling demand.

Heating Mode Sequence

Describes unit operation during heating demand.

Application Considerations for Water Systems

Well Water Systems Guidance

Considerations for copper suitability and water quality.

Cooling Tower;Boiler Systems

Guidance on loop temperatures and heat rejection.

Geothermal Systems Requirements

Specialized knowledge needed for closed loop and pond systems.

System Checkout and Unit Start-Up

Pre-Energizing System Checkout

Checks for voltage, connections, wiring, and piping before energizing.

Unit Start-Up Procedure

Step-by-step guide for initiating unit operation.

Maintenance Procedures

Filter Maintenance Schedule

Guidelines for filter changes based on environment.

Annual Unit Checkup

Recommended performance checks by a mechanic.

Condensate Drain Maintenance

Procedure for annual cleaning and flushing.

Periodic Lockout Troubleshooting

Identifying causes like air/water flow problems.

Unit Check-Out Sheet and Contact Information

Unit Check-Out Sheet Fields

Sections for customer data, nameplate data, and operating conditions.

Bosch Group Contact Information

Provides address, phone, fax, and email for support.

Troubleshooting Common Issues

Unit Error Display and UPM LED Indications

Explains LCD errors and UPM board LED blink codes.

Unit Troubleshooting Table

Lists problems, causes, checks, and corrections.

Compressor Ohms Table

Provides resistance values for compressor windings by model.

Comfort Alert Module Flash Codes

Troubleshooting information based on LED flash codes.

HRP Troubleshooting Table

Diagnoses and resolves HRP system issues.

Electronic Thermostat Installation

Thermostat Installation Procedure

Steps for mounting the thermostat and wiring connections.

Thermostat Connector Locations

Details connector placement based on motor type.