Bosch GreenSource SM024

Other manuals for Bosch GreenSource SM024

Installation And Maintenance Manual96 pages

Questions and Answers

R
Ruben JonesSep 15, 2025
What to do if my Bosch Heat Pump turns off on low pressure control?
- S
  Sarah FarleySep 15, 2025
  If your Bosch Heat Pump is turning off due to low pressure, here are some possible causes: * **Low Suction Pressure:** In cooling mode, this can be caused by a lack of or inadequate airflow, or excessively cold entering air temperature. Check for an inoperative blower, clogged filter, or restrictions in the ductwork. In heating mode, it can be caused by a lack of or inadequate water flow, or excessively cold entering water temperature. Check for a scaled or plugged condenser. * **Low Refrigerant Charge:** The unit may be low on refrigerant. Check for refrigerant leaks, repair them, evacuate the system, and recharge with the factory-recommended charge. * **Defective Low Pressure Switch:** Check for a defective or improperly calibrated low-pressure switch.
L
Lisa WilliamsSep 16, 2025
Why is my Bosch GreenSource SM024 short cycling?
- B
  Brandon GainesSep 16, 2025
  If your Bosch Heat Pump is short cycling, consider the following: * **Oversized Unit:** The unit may be too large for the space. Recalculate the heating and cooling loads. * **Thermostat Placement:** The thermostat might be installed near a supply air grill. Relocate the thermostat or readjust the heat anticipator. * **Wiring and Controls:** Check for a defective or improperly calibrated low-pressure switch.
G
Gregory McmahonNov 19, 2025
How to troubleshoot a Bosch Heat Pump that is not running at all?
- R
  Ruben LiuNov 19, 2025
  If your Bosch Heat Pump isn't running, there are several potential causes: * **Power Supply:** Ensure the unit is receiving power by checking if the power is on and the disconnect is closed. * **Blown Fuse:** Replace any blown fuses or reset tripped circuit breakers, ensuring you use the correct fuses. * **Low Voltage:** If the voltage supply is below the specified minimum on the unit's data plate, contact your local power company. * **Thermostat:** Verify the thermostat is functioning correctly by setting the fan to "ON" to see if the fan runs. Test the cooling and heating modes by setting the thermostat to the lowest and highest temperature settings, respectively. If the blower or compressor doesn't run in any of these cases, the thermostat may be miswired or faulty. Check for 2...
W
wilsonwhitneyNov 24, 2025
Why is my Bosch Heat Pump blowing but the compressor is not running?
- E
  Elizabeth ThomasNov 25, 2025
  If the blower in your Bosch Heat Pump is running but the compressor isn't, consider these potential issues: * **Thermostat:** Verify the thermostat settings, calibration, and wiring are correct. * **Wiring:** Inspect the wiring at the compressor, capacitor, and contactor for any loose or broken connections. * **Safety Controls:** Check the UPM board for a red default L.E.D. blink code. * **Compressor Overload:** If the compressor is cool, but the overload won't reset, it may need replacement. * **Grounded Compressor Motor:** If the internal winding is grounded to the compressor shell, replace the compressor and install a suction filter dryer if there was a compressor burnout. * **Open Compressor Windings:** After the compressor cools, check the continuity of the windings. If t...
S
stevensamandaNov 27, 2025
What to do if my Bosch GreenSource SM024 Heat Pump is not cooling or heating enough?
- R
  robin78Nov 27, 2025
  If your Bosch Heat Pump isn't providing sufficient cooling or heating, consider these factors: * **Unit Size:** Recalculate the heating and cooling loads to ensure the unit is appropriately sized. Adding insulation and shading may help if the loads are excessive. * **Air Leaks:** Check for leaks in the ductwork or ambient air entering through doors or windows. * **Airflow:** Ensure adequate airflow and proper air distribution. Replace any dirty air filters. * **Refrigerant Charge:** A low refrigerant charge can cause inefficient operation. Have the charge checked and adjusted. * **Compressor:** A defective compressor with low discharge and high suction pressure may not be pumping correctly and may need replacement. * **Reversing Valve:** A defective reversing valve can cause r...

Summary

Document Conventions

Key to Symbols

Explains warning symbols and keywords used in the manual.

Safety Warnings

Highlights critical safety precautions and warnings for installation and service.

Model Nomenclature

General Description

Wireless Interface Module (WIM)

Describes the WIM for wireless commissioning and troubleshooting.

Inspecting and Storing the Equipment

Moving and Storage

Guidelines for safely moving and storing the unit.

Unit Installation

Location Selection

Provides guidance on choosing the optimal installation site for the unit.

Blower Configurations

Explains the horizontal unit blower orientation options.

Blower Configurations - Left-Hand Unit Instructions

Blower Configurations - Right-Hand Unit Instructions

Return and Discharge Air Duct Flanges Preparation

Corner Cap Installation Instructions (for HZ Units Only)

Guide for installing corner caps on HZ units.

Mounting Vertical (VT) Units

Mounting Horizontal (HZ) Units

Guidelines for installing horizontal units, including suspension.

Hanging Bracket Kit

Details the installation of the hanging bracket kit for HZ units.

Condensate Drain

Duct System

Instructions for supply and return air duct connections.

Piping

Guidance on supply and return piping connections and materials.

Electrical

Electronic Thermostat Installation

Steps for installing and connecting the electronic thermostat.

Alarm Terminal Wiring

Instructions for wiring the alarm terminals.

Heat Recovery Package (HRP) Setup

Water Tank Preparation

Steps to prepare the water tank for HRP system.

HRP Water Piping

Guidelines for installing HRP water piping.

Specific Application Considerations

Well Water Systems

Considerations for using well water with the heat pump.

Cooling Tower;Boiler Systems

Guidelines for using cooling tower or boiler systems.

Geothermal Systems

Specifics for geothermal system installations.

Post-Installation System Checkout

Unit Start-Up

Procedures for starting up the unit after installation.

Unit Configuration

Bosch EasyStart App

Overview of the Bosch EasyStart app for configuration.

Settings

Details the configurable settings via the Bosch EasyStart app.

System Operation

Timers and Faults

Explains random start-up delay, test mode, and anti-short cycle delay.

Sequence of Operation

Describes the operational sequence for cooling and heating modes.

Reversing Valve Operation

Heat Recovery Package (HRP)

Overview of the HRP components and function.

Dehumidification

Latching Mode Operation

Explains the staging down process in heating/cooling.

System Protection

Pressure Protection

Overview of high and low pressure protection mechanisms.

Low Loop Water Protection Control (LLWPC) (Boilerless Control)

Prevents low loop water during heating operation.

Water Flow Detection

Monitors water flow to prevent issues like freezing.

Return Air Temperature (RAT) Sensor

Discharge Air Temperature (DAT) Sensor

Measures supplied air temp to determine unit state.

Leaving Water Temperature (LWT) Sensor

Coaxial Water Coil Freeze (FZC) Sensor

Detects freezing conditions in the coaxial water coil.

Evaporator Air Coil Freeze (FZE) Sensor

Discharge Refrigerant Temperature (DRT) Sensor

Monitors DRT for HRP operation suitability.

Domestic Water Temperature (DWT) Sensor

Options

Electric Heat

Details internally-mounted supplemental electric heat options.

Smart Start Assist

Accessory to reduce compressor starting current.

Smart Start Assist Specifications

Smart Start Assist Modes of Operations

Explains normal and undervoltage conditions for SSA.

Loop Pump Control (former Pump Valve Relay Kit)

Wireless Interface Module (WIM)

Troubleshooting

HPC LED Status Indicator (Blink Code) Information

Explains HPC LED blink codes for fault diagnosis.

Unit Troubleshooting

NO COMPRESSOR OPERATION BUT FAN RUNS

Diagnosing issues when the fan runs but the compressor does not.

NO COMPRESSOR OR FAN OPERATION

Troubleshooting no compressor or fan operation.

NO FAN OPERATION-ECM CONSTANT AIRFLOW MOTOR

Diagnosing issues with the ECM fan motor.

EXCESSIVELY COLD SUPPLY AIR TEMPERATURE IN COOLING OR EXCESSIVELY HOT SUPPLY AIR TEMPERATURE IN HEATING

Diagnosing incorrect supply air temperatures.

HIGH-PRESSURE FAULT

Diagnosing and resolving high-pressure faults.

LOW-PRESSURE FAULT

Diagnosing and resolving low-pressure faults.

FREEZE COAXIAL FAULT

Troubleshooting coaxial freeze faults.

CONDENSATE OVERFLOW FAULT

Diagnosing condensate overflow faults.

BROWNOUT FAULT

Troubleshooting brownout voltage conditions.

NOT COOLING FAULT

Diagnosing when the unit is not cooling.

NOT HEATING FAULT

Diagnosing when the unit is not heating.

Unit Noise Troubleshooting

OBJECTIONABLE NOISE LEVELS

Addresses air noise, structure-borne noise, and compressor noise.

HRP Troubleshooting

NO FLOW LOW FLOW

Troubleshooting no or low flow conditions for HRP.

Smart Start Assist Troubleshooting

Maintenance

Filter changes or cleaning

Routine filter maintenance schedule.

Annual checkup

Recommends annual inspections by qualified mechanics.

Wiring Diagrams

Thermostat Connections

Alarm Terminal Wiring

Instructions for wiring alarm signals.

Basic Piping Diagram

Dimensional Drawings

Horizontal-Straight-Through Configuration

Provides dimensions for HZ units in straight-through config.

Exploded Views

HZ Unit Exploded View

Exploded view showing components of the HZ unit.

VT Unit Exploded View

Exploded view showing components of the VT unit.

Terminology

Acronyms

Lists and defines common acronyms used in the manual.

Terms

Defines key terms related to HVAC and refrigerants.

Spare Parts List

Wiring Harness

Images and part numbers for various wiring harnesses.

Electrical Box Typical Layout and Spare Parts List

Refrigeration Components

Rev. C HZ

Lists refrigeration components for HZ models.

Rev. C VT

Lists refrigeration components for VT models.

Decommissioning Information

Protecting the Environment

Guidance on environmentally responsible product disposal.

Check-Out Sheet

EasyStart Check-Out Sheet

NOTES