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Bosch SM070 - User Manual

Bosch SM070
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Installation, Operation and Maintenance Manual
SM Series Heat pump
6 720 220 406 (2015/02)
SM024 | SM036 | SM048 | SMO60 | SM070

Table of Contents

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Questions and Answers

  • K
    Kathryn StricklandSep 18, 2025
    What to do if my Bosch Heat Pump keeps turning off due to high pressure?
    • T
      Tyrone Stephens PhDSep 18, 2025
      If your Bosch Heat Pump shuts off due to high pressure, the discharge pressure might be too high. In cooling mode, check for inadequate water flow, excessively warm entering water temperature, or a scaled/plugged condenser. In heating mode, check for insufficient airflow due to an inoperative blower, clogged filter, or ductwork restrictions. Also, the unit may be overcharged with refrigerant. Reclaim refrigerant, evacuate and recharge with factory recommended charge. Finally, inspect the high-pressure switch for defects or improper calibration.
  • D
    Daniel LeblancAug 25, 2025
    Why is my Bosch SM070 Heat Pump not cooling or heating enough?
    • J
      Jessica PetersonAug 25, 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).
  • F
    Felicia RandolphAug 25, 2025
    What to do if my Bosch SM070 compressor isn't working?
    • C
      Crystal BakerAug 26, 2025
      If the compressor on your Bosch Heat Pump isn't operating but the fan is running, it could be due to an open compressor overload. Check for supply voltage at the load side of the contactor. For 3-phase models, check the phase rotation and voltage at all 3 phases. Poor wiring connections can also cause this; look for signs of heat on the wiring insulation and ensure that all wiring connections are secure and properly torqued. A burned-out compressor is another possibility; check if the compressor hums when power is applied. If not, check the resistance of the compressor windings using the values shown in the compressor characteristics chart, ensuring the compressor is cool (70° F) when checking the windings.
  • L
    lcruzAug 28, 2025
    Why does my Bosch Heat Pump unit shut off on low pressure control?
    • M
      monicaberryAug 28, 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.
  • J
    Jordan ColemanSep 22, 2025
    Why does my Bosch Heat Pump shut off on low pressure control?
    • E
      Erik GomezSep 22, 2025
      If your Bosch Heat Pump shuts down due to low pressure, it could be due to suction pressure being too low. In cooling mode, check for inadequate airflow, excessively cold entering air temperature, an inoperative blower, a clogged filter, or ductwork restrictions. In heating mode, check for insufficient water flow, excessively cold entering water temperature, or a scaled/plugged condenser. The unit might also be low on refrigerant, so check for leaks and repair, evacuate, and recharge with the factory-recommended charge. Also, inspect the low-pressure switch for defects or improper calibration.
  • J
    James SmithDec 1, 2025
    How to troubleshoot entire Bosch SM070 Heat Pump unit that does not run?
    • A
      ahardingDec 1, 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...
  • D
    danielmasonSep 12, 2025
    What to do if my Bosch SM070 Heat Pump is short cycling?
    • E
      Elizabeth CarpenterSep 12, 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.
  • W
    William DavisSep 12, 2025
    What to do if my Bosch SM070 has no flow or low flow?
    • L
      Lee WilliamsSep 12, 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.
  • J
    Jacqueline ArnoldDec 1, 2025
    Why is my Bosch SM070 providing insufficient cooling or heating?
    • B
      Beverly HodgeDec 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...
  • S
    Sheila WallSep 4, 2025
    How to fix excessively cold air from Bosch SM070 in cooling?
    • E
      Erica CruzSep 4, 2025
      If your Bosch Heat Pump is producing excessively cold air during cooling or excessively hot air during heating, it could be due to reduced airflow. Try replacing the filter. The fan speed might be too low, so consult the blower performance table and increase fan speed if possible. Also, excessive duct pressure drop can cause this issue; consult the blower performance table and increase fan speed if possible.

Summary

Key to Symbols

Warning Symbols

Identifies symbols used for warnings and their severity levels.

Important Information Symbol

Indicates important information where there is no risk to property or people.

Safety Warnings

Installation and Servicing Hazards

Warns about hazards from system pressure and electrical components.

Power Disconnection for Service

Emphasizes turning off main power before service to prevent electrical shock.

General Precautions During Work

Advises observing precautions, following codes, wearing safety gear, and having fire extinguisher.

Refrigerant Handling

Specifies that refrigerant circuit must be serviced by qualified technicians.

Construction Process Use

Warns against using units for heating/cooling during construction to avoid damage.

Standard Package Components

Model Nomenclature

General Description

Unit Features and Certifications

Highlights performance, efficiency, AHRI ISO, UL1995, and CAN/CSA C22.2 standards.

Operating Temperature Ranges

Specifies entering fluid temperature ranges for heating and cooling modes.

Extreme Condition Limitations

Notes limitations on air/fluid flow rates and temperatures under extreme conditions.

Minimum Entering Water Temperature

Recommends 50°F EWT for well water; antifreeze required for closed loops below 45°F.

Available Configurations and Options

Lists Vertical, Horizontal, Counter-Flow configs and factory-installed options.

External Error Code Display

Mentions an externally mounted LCD for unit diagnosis without opening the cabinet.

Moving and Storage

Initial Inspection

Location Requirements

Indoor Installation and Access

Specifies indoor installation, easy access for service, and sufficient room for connections.

Return Air Path and Freezing Avoidance

Ensures return air path and avoids locating units in areas subject to freezing.

Configurability

Horizontal Configuration Blower Options

Describes field configurable blower orientation: end blow or straight through.

Left-Hand Unit Blower Configuration

Provides instructions for reconfiguring the blower on left-hand horizontal units.

Electric Heat and Airflow Configuration

Notes that discharge air configuration changes are not possible with electric heat.

Vertical Configurability

Counter-Flow Configuration

Describes the dedicated downflow configuration for Counter-Flow units.

Vertical Unit Configuration Options

Details field configuration for Vertical units by relocating E-box and reorienting blower.

Discharge Air Configuration Limitations

States discharge air configuration changes are not possible with electric heat.

Access to Internal Components

Panel Belt Removal

Instructions for removing the panel belt to access internal components.

Safety Precaution for Panel Access

Recommends two persons for safety precautions when performing panel removal.

Pre Installation Unit Preparation

Corner Cap Identification and Installation

Provides instructions for identifying and installing corner caps on the unit.

Mounting Units

Vertical Unit Mounting

Details mounting vertical units level on vibration absorbing pads.

Horizontal Unit Mounting

Describes suspending horizontal units above ceilings using threaded rods.

Hanging Bracket Kit Installation

Instructions for installing the hanging bracket kit for suspended unit mounting.

Condensate Drain

Condensate Drain Re-configuration

Details relocating the condensate drain connection for left-hand to right-hand return.

Condensate Drain Line Installation

Explains connecting the drain line, pitching it away from the unit, and including a trap.

Duct System

Duct Connection Requirements

Specifies supply and return air outlet collars and flanges for duct connections.

Duct Sizing and Insulation

Recommends flexible connectors, insulation, and proper duct sizing for performance.

Return Air Path Requirements

Ensures no direct air path to heat pump and requires a 90-degree turn in return air.

Piping

Piping Size and Material

Recommends piping size, copper or cupro-nickel condenser based on water quality.

Water Piping Insulation and Valves

Advises insulating lines, using ball valves, and checking for leaks.

Water Flow Rate Considerations

Warns against exceeding recommended water flow rates to prevent heat exchanger damage.

Water Quality

Electrical

Conduit Connections

Details attaching conduit and connecting ground lead and power leads.

Power Supplies for Internal Heat

Specifies two separate power supplies for units with internal electric heat.

Safety Devices and UPM Controller

Describes UPM controller functions, safety devices, and board indicators.

Electrical System Details

Thermostat Malfunction Light Connections

Explains connections for thermostat malfunction lights.

UPM Controller and Safety Controls

Details UPM controller functions and safety controls like high/low pressure switches.

Freeze Protection Sensors

Describes water and evaporator side freeze protection sensor functions and settings.

Condensate Overflow Protection

Explains the condensate overflow protection sensor location and connection.

UPM Board Features

UPM Board Factory Default Settings

Lists default settings for UPM board parameters like TEMP, LOCKOUT, RESET, ALARM, TEST.

UPM DIP Switch Default Positions

Shows default positions for UPM DIP switches for lockout, reset, alarm, and test.

UPM Board Timer Features

Details Anti-Short Cycle Timer and Random Start features of the UPM board.

UPM Power Interruption Protection

Explains brownout/surge protection and how the unit behaves during power interruptions.

Malfunction and Display Outputs

Describes malfunction output (dry contact) and display output (pulse) functions.

ECM Interface Board

Freeze Sensor Settings and Operation

Explains freeze sensor settings, soft/hard lockout conditions, and recommended flow switch.

Intelligent Reset and Lockout Reset

Details intelligent reset procedures and manual lockout reset methods.

ECM Interface Board Functionality

Describes the ECM interface board's role in translating thermostat inputs to ECM motor commands.

ECM Interface Board Details

Thermostat Connections and Functions

Lists thermostat connections and their functions for compressor, fan, and auxiliary heat.

Airflow Selector Adjustment

Explains how to adjust airflow using the selector for application requirements.

Dehumidification Method Selector

Details selecting between Hot Gas Reheat and fan-only dehumidification modes.

Constant Torque Motors (ECM)

ECM Motor Features and Operation

Describes ECM motor efficiency, flatter fan curve, and simple operation.

Changing Speed Tap Settings

Provides instructions for changing speed taps to adjust airflow and static options.

Options

Hot Gas Reheat (HGRH) Option

Explains HGRH for cooling and dehumidifying return air without altering sensible temperature.

Electric Heat Option

Details supplemental electric heat for auxiliary or emergency backup heat.

Heat Recovery Package (HRP) Option

Describes HRP for heating potable water using waste heat from compressor discharge.

Additional Options

HRP Operation and Freezing Prevention

Explains HRP operation, temperature monitoring, and draining to prevent freezing.

Constant Airflow Motor (ECM)

Details ECM motor for constant airflow and optimized power consumption.

DPS Water Flow Proving Switch

Explains DPS switch function to prevent compressor operation without adequate water flow.

Pump Relay and Comfort Alert Module

Describes pump relay for energizing supply pumps and Comfort Alert for troubleshooting.

Smart Start Assist

SSA Device Functionality

Explains SSA reducing starting current, extending compressor life, and optimizing starts.

SSA Specifications

Lists operational voltage, environmental range, IP rating, and current ratings for SSA.

Mode of Operation

Normal and Undervoltage Conditions

Describes LED status and controller behavior under normal and undervoltage conditions.

Overcurrent and Incomplete Ramp Alarms

Details LED indications and controller actions for overcurrent and incomplete ramp alarms.

Mode of Operation Notes

SSA LED Status and Alarms

Explains green and red LED indications for power supply and alarm conditions.

SSA Recovery from Faults

Details SSA recovery behavior after undervoltage, overcurrent, and incomplete ramp alarms.

Heat Recovery Package

Water Tank Preparation

Provides steps for preparing the water tank for HRP installation.

HR Water Piping Installation

Details piping requirements, insulation, and isolation valves for the HRP system.

Water Tank Refill

Initial Start-Up

Heat Recovery System Valves and Operation

Ensures valves are open, never operate HR pump dry, and checks HR pump operation.

Water Temperature Difference Monitoring

Checks for expected water temperature difference across the heat recovery system.

Sequence of Operation

Cooling Mode Operation

Describes unit operation in cooling mode, including fan and compressor staging.

Heating Mode Operation

Details unit operation in heating mode, including auxiliary and emergency heat.

Application Considerations

Well Water Systems

Discusses copper suitability, water quality testing, and solenoid valve use for well water.

Cooling Tower;Boiler Systems

Details loop temperature maintenance, heat rejection, and chemical treatment for cooling towers.

Additional Application Considerations

Open Cooling Tower and Boiler Use

Covers air elimination in closed loops, boiler use for heating, and temperature exposure risks.

System Cleaning and Flushing

Emphasizes cleaning and flushing the water system before connecting the unit.

Geothermal Systems

Geothermal Application Requirements

Highlights need for specialized knowledge, training, and GLP for geothermal installations.

Anti-Freeze Solutions

Mentions use of anti-freeze solutions for low evaporating conditions in geothermal systems.

System Checkout

Pre-Energization System Checks

Lists checks for supply voltage, electrical connections, fusing, wiring, and piping.

Grounding and Blower Rotation Checks

Ensures proper grounding and free rotation of the blower assembly.

Serviceability and Access Panel Security

Confirms unit serviceability and that all access panels are secured.

Unit Start-Up Procedures

Cooling Mode Start-Up

Guides setting thermostat for cooling mode, checking operation, and system equalization.

Heating Mode Start-Up

Guides setting thermostat for heating mode and checking operation.

MAINTENANCE

Filter Changes and Cleaning

Recommends filter maintenance intervals based on environment type.

Annual Mechanic Checkup

Suggests annual performance checks by a licensed refrigeration mechanic.

Blower Motor Lubrication

Advises on blower motor lubrication, recommending SAE-20 non-detergent oil.

Condensate Drain Check

Recommends annual cleaning and flushing of the condensate drain.

Periodic Lockout Causes

Identifies air/water flow problems as common causes for unit lockouts.

UNIT CHECK-OUT SHEET

Customer and Unit Data

Fields for customer name, address, phone, and unit identification details.

Unit Nameplate Data Entry

Space to record unit make, model, refrigerant charge, compressor, and blower specs.

Operating Conditions Recording

Sections to record entering/leaving air and fluid temperatures, flow, and pressures.

Auxiliary Heat Data Entry

Fields to record auxiliary heat unit make, fuse size, voltage, and air temperatures.

TROUBLESHOOTING

UPM Board LED Indications

Table detailing UPM board LED colors, blinks, and corresponding fault descriptions.

Unit Troubleshooting - Unit Does Not Run

Troubleshooting steps for issues where the entire unit does not run.

Troubleshooting - Blower Operates, Compressor Does Not

Steps to diagnose issues when the blower runs but the compressor does not.

Unit Troubleshooting - Continued

High Pressure Control Issues

Diagnosing unit shutdown due to high pressure control issues.

Low Pressure Control Issues

Diagnosing unit shutdown due to low pressure control issues.

Short Cycling Issues

Troubleshooting causes for the unit short cycling.

Insufficient Cooling or Heating

Diagnosing and resolving issues with insufficient cooling or heating performance.

Compressor Ohms and Comfort Alert Codes

Compressor Resistance Values

Provides resistance (ohms) values for compressor start and run windings by model.

Comfort Alert Module Flash Codes

Lists flash codes for Comfort Alert module and corresponding troubleshooting information.

Troubleshooting - Continued

Comfort Alert Flash Code Solutions

Provides solutions for Comfort Alert flash codes 6, 7, 8, and 9.

HRP Troubleshooting Guide

Troubleshooting steps for HRP issues related to flow, temperature, and heat output.

Smart Start Assist LED Status

Red LED Status Indications

Explains red LED status indications for SSA, including flashes and recovery mode.

Green LED Status Indications

Describes green LED status indications for SSA, related to power supply and idle state.

ELECTRONIC THERMOSTAT

Thermostat Installation

Instructions for mounting thermostat subbase, drilling, and wiring.

Thermostat Connector Locations

Details locations of detachable thermostat connectors based on motor type.

2-Cool, 3-Heat Thermostat Wiring

Explains jumper connections for 2-cool, 3-heat thermostats with W1/W2 and W2/EM.

OPERATING TEMPERATURES AND PRESSURES

Cooling Mode Operating Data

Table showing operating temperatures and pressures for cooling mode by model and load.

Heating Mode Operating Data

Table showing operating temperatures and pressures for heating mode by model and load.

AIRFLOW TABLES

Constant Torque Motor Airflow Table

Provides airflow data for Constant Torque Motors at various static pressures.

Constant Airflow Motor Airflow Table

Lists airflow data for Constant Airflow Motors (ECM) at various static pressures.

WATER SIDE PRESSURE DROP TABLE

WIRING DIAGRAMS

Main Unit Wiring Diagram

Illustrates the overall wiring of the unit, including components and connections.

Component Legends and Notes

Provides legends for standard/optional components and important wiring notes.

WIRING HARNESS DRAWINGS

Constant Torque Motor Harnesses

Diagrams for wiring harnesses related to constant torque motors.

Constant Airflow Motor Harnesses

Diagrams for wiring harnesses related to constant airflow ECM motors.

Vertical (VT) Spare Parts

VT Cabinet Parts List

Illustrates and lists cabinet components for Vertical units.

VT Blower Parts List

Illustrates and lists blower assembly components for Vertical units.

VT Refrigeration and Electrical Parts

Illustrates and lists refrigeration and electrical components for Vertical units.

VT Detailed Parts Views

Provides detailed illustrations of specific VT spare parts.

VT Detailed Parts Views (Continued)

Continues detailed illustrations of specific VT spare parts.

Horizontal (HZ) Spare Parts

HZ Cabinet Parts List

Illustrates and lists cabinet components for Horizontal units.

HZ Blower Parts List

Illustrates and lists blower assembly components for Horizontal units.

HZ Refrigeration Parts List

Illustrates and lists refrigeration components for Horizontal units.

HZ Panel Parts List

Illustrates and lists panel components for Horizontal units.

HZ Detailed Parts View

Provides detailed illustrations of specific HZ spare parts.

Counter Flow Spare Parts

Counter Flow Cabinet Parts List

Illustrates and lists cabinet components for Counter Flow units.

Counter Flow Blower Parts List

Illustrates and lists blower assembly components for Counter Flow units.

Counter Flow Panel Parts List

Illustrates and lists panel components for Counter Flow units.

Counter Flow Refrigeration Parts List

Illustrates and lists refrigeration components for Counter Flow units.

Counter Flow Detailed Parts View

Provides detailed illustrations of specific Counter Flow spare parts.

DIMENSIONAL DRAWINGS

Horizontal End Blow Dimensions

Provides dimensional data and illustrations for horizontal end blow configurations.

Horizontal Straight Through Dimensions

Provides dimensional data and illustrations for horizontal straight through configurations.

Horizontal Hanging Bracket Locations

Shows hanging bracket location specifications for horizontal units.

Counter Flow Dimensions

Provides dimensional data and illustrations for Counter Flow units.

Vertical Dimensions

Provides dimensional data and illustrations for Vertical units.

Bosch SM070 Specifications

General IconGeneral
BrandBosch
ModelSM070
CategoryHeat Pump
LanguageEnglish

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