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Bosch CA - User Manual

Bosch CA
28 pages
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Installation, Operation and Maintenance Manual
CA Model
8733942456 (2016/04)

Table of Contents

Questions and Answers

  • K
    kimcordovaJul 26, 2025
    How to troubleshoot a Bosch CA Heat Pump when the entire unit does not run?
    • M
      Melissa DanielJul 26, 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 use 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. Also, examine the thermostat settings and wiring.
  • R
    ryan29Jul 31, 2025
    Why is the blower running but the compressor not working on my Bosch CA?
    • W
      William ShortJul 31, 2025
      If your Bosch Heat Pump blower operates but the compressor does not, check the thermostat settings, calibration, and wiring. Inspect for any loose or broken wires at the compressor, capacitor, or contactor. Also, check the UPM board red default L.E.D. for a Blink Code. If the compressor overload is open and the compressor is cool, and the overload won't reset, consider replacing the compressor. If the compressor motor is grounded (internal winding grounded to the compressor shell) or the compressor windings are open, replace the compressor. If there was a compressor burnout, install a suction filter dryer.
  • J
    jennifer27Aug 10, 2025
    What to do if my Bosch CA Heat Pump unit turns off on high pressure control?
    • B
      Brian NobleAug 11, 2025
      If your Bosch Heat Pump unit turns off due to high pressure, it could be due to several reasons. In cooling mode, check for a lack of or inadequate water flow, excessively warm entering water temperature, or a scaled/plugged condenser. In heating mode, investigate lack of or inadequate air flow, an inoperative blower, a clogged filter, or restrictions in the duct work. Also, the unit might be overcharged with refrigerant, in which case you should reclaim the refrigerant, evacuate the system, and recharge it with the factory-recommended amount. Finally, inspect the high-pressure switch for defects or improper calibration.
  • J
    Jerry WilcoxAug 16, 2025
    What to do if my Bosch CA Heat Pump unit shuts off on low pressure control?
    • K
      Kenneth JohnstonAug 16, 2025
      If your Bosch Heat Pump unit turns off due to low pressure, it could be caused by suction pressure being too low. In cooling mode, this may result from a lack of or inadequate air flow, or an entering air temperature that is too cold, blower inoperative, clogged filter or restrictions in duct work. In heating mode, a lack of or inadequate water flow or an entering water temperature that is too cold, or a scaled or plugged condenser might be the cause. The unit could also be low on refrigerant, so check for leaks, repair them, evacuate the system, and recharge with the factory-recommended charge. Lastly, check the low-pressure switch for defects or improper calibration.
  • T
    Tyler PruittAug 20, 2025
    Why does my Bosch CA Heat Pump keep short cycling?
    • K
      Kevin ThompsonAug 20, 2025
      If your Bosch Heat Pump is short cycling, the unit might be oversized, requiring a recalculation of heating and cooling loads. The thermostat could be installed near a supply air grill; if so, relocate it and readjust the heat anticipator. Also, check the wiring and controls for a defective or improperly calibrated low-pressure switch.
  • E
    Emily HamiltonNov 4, 2025
    Why is my Bosch CA providing insufficient cooling or heating?
    • R
      Rhonda FullerNov 4, 2025
      If your Bosch Heat Pump isn't cooling or heating sufficiently, several factors could be at play. The unit might be undersized, so recalculate the heating and cooling loads, adding insulation and shading if excessive. Check for leaks in duct work or the introduction of ambient air through doors or windows. Ensure adequate airflow and proper distribution by replacing any dirty filters. A low refrigerant charge can cause inefficient operation. Inspect the compressor for defects; if the discharge is too low and suction pressure is too high, the compressor may not be pumping properly. Check the reversing valve for defects that could cause refrigerant bypass. Compare unit operating pressures to the pressure/temperature chart. Examine the TXV for restrictions or defects, replacing it if necessary...

Summary

Model Nomenclature

Unit Model Identification

Explains the coding system for identifying the unit model and its features.

Safety and Symbol Key

Warning Symbol Definitions

Defines warning symbols and keywords like NOTICE, CAUTION, WARNING, DANGER.

General Safety Precautions

Provides essential safety notices for operating and servicing the unit.

Product Overview and Handling

Standard Package and Initial Inspection

Details standard components and guides on initial product inspection.

Unit Description, Moving, and Location

Covers general unit description, handling, storage, and placement requirements.

Installation and Piping

Unit Installation and Electrical Connections

Outlines unit installation steps and electrical connection guidance.

Piping Requirements and Condensate

Details supply/return piping, condensate piping, and hose kit installation.

Electrical System and UPM Controller

Field Wiring and UPM Components

Covers field wiring, power connections, and UPM controller components.

UPM Operation and Features

UPM Settings, Features, and Functions

Details UPM settings, features like anti-short cycle, and functions like malfunction output.

Controller Functions and Protection

Freeze Protection and CUC Controller

Explains freeze sensor operation/bypass and CUC controller features.

Application Considerations

Well Water and Low Temp Loop Apps

Discusses well water systems and bypassing freeze stat for low temp loops.

Water Quality Management

Water Quality Importance and Concerns

Stresses water quality importance and details open loop system concerns.

Water Quality Specifications

Acceptable Water Quality Values

Presents a table of acceptable values for scaling, corrosion, and fouling.

UPM Sequence of Operation

UPM Operational Flowchart

Illustrates the sequence of operations for the UPM controller.

Operation and System Checks

Unit Modes and System Types

Explains unit modes, cooling tower, boiler, and geothermal systems.

Post-Installation Checkout and Voltage

Lists checkout steps, voltage checks, and transformer considerations.

Unit Start-Up and Troubleshooting

Start-Up Procedure and Fault Codes

Provides start-up steps, CUC fault codes, and UPM LED indicators.

Troubleshooting Guide

Common Unit Troubleshooting

Provides a table correlating problems with possible causes and checks/corrections.

Specific Troubleshooting and Blower Data

Performance Issues and Blower Specs

Addresses short cycling, performance issues, and blower performance data.

Motor and Pressure Data

PSC Motor Electrical and Pressure Drop Data

Covers PSC motor electrical data and water side pressure drop tables.

Operating Data Tables

Cooling and Heating Operating Parameters

Shows operating data including temperatures and pressures for cooling and heating modes.

Wiring Diagrams and Controls

Fan Motor Wiring, Legend, and Programming

Illustrates fan motor wiring, defines diagram legends, and guides controller programming.

Detailed Wiring Schematics

UPM Wiring and LED Fault Indicators

Shows UPM wiring details and lists UPM LED fault indicator codes.

System Schematic

Refrigerant Circuit and Diagram Legend

Depicts the refrigerant circuit and explains schematic diagram symbols and notes.

Unit Dimensions - Standard Length

Standard Unit Dimensional Data

Provides a table with dimensional data for standard length units.

Unit Dimensions - Extended Length

Extended Unit Dimensional Data

Provides a table with dimensional data for extended length units.

Unit Check-Out and Commissioning

Customer, Unit, and Operating Data

Fields for customer, unit identification, nameplate data, and operating conditions.

Maintenance and Disposal Information

Routine Maintenance and Troubleshooting Lockouts

Advises on filter maintenance, drain checks, annual checkups, and lockout troubleshooting.

Decommissioning and Environmental Protection

Covers equipment decommissioning, component recycling, and refrigerant handling.

Technical Glossary

Key Terminology Definitions

Defines key technical terms used in the manual for clarity.

Bosch CA Specifications

General IconGeneral
BrandBosch
ModelCA
CategoryHeat Pump
LanguageEnglish

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