Bosch SM024 - User Manual

Other manuals for Bosch SM024

Manual44 pages

Questions and Answers

J
Juan JosephAug 20, 2025
Why is my Bosch Heat Pump not cooling or heating enough?
- T
  tammyjonesAug 20, 2025
  There are several potential reasons why your Bosch Heat Pump might not be providing sufficient cooling or heating. It could be due to an undersized unit (in which case, recalculating heating and cooling loads and adding insulation or shading might help), loss of conditioned air through leaks in ductwork or around doors/windows, inadequate airflow (check and replace the filter if dirty), low refrigerant charge, a defective compressor or reversing valve, operating pressures that don't match the unit's pressure/temperature chart, a restricted or defective TXV, or contamination of the refrigerant system with moisture or noncondensables (in which case you need to reclaim refrigerant, replace the filter dryer, evacuate the system, and recharge with the recommended charge).
J
Jennifer RobertsonAug 26, 2025
Why does my Bosch Heat Pump unit shut off on low pressure control?
- Z
  ztoddAug 26, 2025
  If your Bosch Heat Pump shuts off due to low pressure control, it could be caused by several factors. In cooling mode, this may be due to a lack of or inadequate air flow, entering air temperature being too cold, an inoperative blower, a clogged filter, or restrictions in the duct work. In heating mode, it may be due to a lack of or inadequate water flow, entering water temperature being too cold, or a scaled or plugged condenser. Also, the unit could be low on refrigerant, requiring you to check for a refrigerant leak, repair it, evacuate, and recharge with the factory-recommended charge. Finally, check for a defective or improperly calibrated low-pressure switch.
R
Roger CarpenterAug 31, 2025
What to do if the blower operates but the compressor doesn't in my Bosch SM024?
- J
  Joy WatsonSep 1, 2025
  If the blower in your Bosch Heat Pump is running, but the compressor isn't, here are a few things to check: the thermostat settings, calibration, and wiring; loose or broken wires at the compressor, capacitor, or contactor; the UPM board red default L.E.D. for a Blink Code; whether the compressor overload is open (if the compressor is cool and the overload won't reset, replace the compressor); if the compressor motor is grounded (internal winding grounded to the compressor shell - replace compressor and install suction filter dryer if compressor burnout); or if the compressor windings are open (check continuity after the compressor has cooled, and replace the compressor if the windings are open).
E
Eugene CoffeySep 2, 2025
What to do if my Bosch Heat Pump unit shuts off due to high pressure?
- R
  Russell LeeSep 3, 2025
  If your Bosch Heat Pump shuts off on high pressure control, it could be due to several reasons. In cooling mode, it could be due to a lack of or inadequate water flow, entering water temperature being too warm, or a scaled or plugged condenser. In heating mode, it may be caused by a lack of or inadequate air flow, an inoperative blower, a clogged filter, or restrictions in the duct work. The unit might also be overcharged with refrigerant, requiring you to reclaim refrigerant, evacuate, and recharge with the factory-recommended charge. Finally, check for a defective or improperly calibrated high-pressure switch.
U
ushawSep 4, 2025
What to do if my Bosch Heat Pump is short cycling?
- R
  richardsontheresaSep 4, 2025
  If your Bosch Heat Pump is short cycling, several factors could be responsible. The unit might be oversized, requiring a recalculation of heating and cooling loads. The thermostat could be installed near a supply air grill, necessitating relocation, or the heat anticipator may need readjustment. Additionally, check for a defective or improperly calibrated low-pressure switch.
M
Mariah FigueroaSep 6, 2025
What to do if my Bosch SM024 has no flow or low flow?
- B
  Breanna HicksSep 6, 2025
  If your Bosch Heat Pump experiences no flow or low flow, here's what you can check: * Verify the power supply. * Ensure the on/off switch is in the 'ON' position. * Engage the heat pump contactor. * Repair or tighten any broken or loose wires. * Purge air from the piping system. * Remove the pump cartridge and clean it if the pump shaft/impeller is stuck. * Replace the pump if it is defective. * Repair any kinks in the water piping and check for proper line size.
E
Eric WheelerSep 8, 2025
Why is the water temperature high in my Bosch Heat Pump?
- A
  Ashley BarkerSep 8, 2025
  High water temperature in your Bosch Heat Pump may be due to a stuck water temperature limit switch or a sensor that is not securely attached to the line.
Y
yvette01Sep 10, 2025
Why is there low heat output from my Bosch SM024 Heat Pump?
- C
  Curtis OwenSep 10, 2025
  Low heat output from your Bosch Heat Pump could be due to a scaled or fouled heat exchanger. Clean the heat exchanger to resolve this issue.
W
wayneyoungSep 12, 2025
What to do if my Bosch Heat Pump unit turns off on high pressure control?
- A
  Amy LewisSep 12, 2025
  If your Bosch Heat Pump is turning off due to the high-pressure control, the discharge pressure might be too high. In 'COOLING' mode, this could be due to a lack of or inadequate water flow, the entering water temperature being too warm, or a scaled or plugged condenser. In 'HEATING' mode, it could be due to a lack of or inadequate airflow, an inoperative blower, or clogged filters or restrictions in the ductwork. Another cause might be that the unit is overcharged with refrigerant, requiring you to reclaim refrigerant, evacuate, and recharge with the factory-recommended charge. Finally, check for a defective or improperly calibrated high-pressure switch.
M
Mark BishopSep 13, 2025
What causes a Bosch SM024 Heat Pump unit to turn off on low pressure control?
- K
  kimberlymillerSep 14, 2025
  If your Bosch Heat Pump is turning off due to the low-pressure control, it may be due to suction pressure being too low. In 'COOLING' mode, this can result from a lack of or inadequate airflow, the entering air temperature being too cold, an inoperative blower, clogged filters, or restrictions in the ductwork. In 'HEATING' mode, it may be due to a lack of or inadequate water flow, the entering water temperature being too cold, or a scaled or plugged condenser. Another cause could be the unit being low on refrigerant, requiring a check for leaks, repair, evacuation, and recharge with the factory-recommended charge. Lastly, check for a defective or improperly calibrated low-pressure switch.

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.