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Bosch BP Series - User Manual

Bosch BP Series
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CP/BP Series
Installation and Maintenance Manual
Revised 05-12
6 720 220 045

Table of Contents

Questions and Answers

  • N
    Nancy WileyAug 3, 2025
    Why is my Bosch Heat Pump unit off on high pressure control?
    • K
      katherinecoxAug 3, 2025
      The Bosch Heat Pump may be shutting off due to high pressure. This can occur if the discharge pressure is too high because of inadequate water flow, the entering water temperature is too warm, or the condenser is scaled or plugged in cooling mode. In heating mode, it may be due to lack of air flow because the blower is inoperative, the filter is clogged, or there are restrictions in the duct work. Also, the unit might be overcharged with refrigerant, or there may be a defective or improperly calibrated high-pressure switch.
  • L
    Leon RileyAug 10, 2025
    Why is my Bosch BP unit short cycling?
    • J
      Janet LoweAug 11, 2025
      Your Bosch Heat Pump might be short cycling because the unit is oversized, so recalculate heating and or cooling loads. Another reason could be the thermostat, which may be installed near a supply air grill; relocate the thermostat and readjust the heat anticipator. Defective or improperly calibrated low pressure switch can also lead to short cycling.
  • J
    Julie SilvaSep 10, 2025
    What to check if the blower operates but the compressor does not in my Bosch Heat Pump?
    • C
      Christopher WilliamsSep 12, 2025
      If the blower in your Bosch Heat Pump is running but the compressor isn't, start by checking the thermostat's settings, calibration, and wiring. Inspect the wiring at the compressor, capacitor, or contactor for any loose or broken wires. Check the UPM board for a red default L.E.D. blink code. 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 the compressor. Finally, after the compressor has cooled, check the continuity of the compressor windings; if they're open, replace the compressor.
  • K
    Kelly Ramsey MDOct 26, 2025
    Why won't my Bosch Heat Pump run at all?
    • J
      James JohnsonOct 26, 2025
      If your Bosch Heat Pump isn't running, check the following: * Make sure the power supply is on and the disconnect is closed. * Replace any blown fuses or reset the circuit breaker, ensuring you use the correct fuses. * If the voltage supply is below the minimum specified on the unit's data plate, contact your local power company. * Check the thermostat by setting the fan to 'ON' to see if the fan runs. Set the thermostat to 'COOL' at the lowest temperature, then to 'HEAT' at the highest temperature, to see if the unit runs in either mode. If nothing happens, the thermostat may be miswired or faulty. Verify 24 volts at the low voltage terminal strip between 'R' and 'C', 'Y' and 'C', and 'O' and 'C'. If the blower doesn't operate, check for 24 volts between terminals 'G' and 'C'. R...

Summary

Initial Inspection

General Description

Moving and Storage

Safety Considerations

Location

Installation

Mounting Vertical Units

Instructions for mounting vertical units on a vibration pad.

Mounting Horizontal Units

Instructions for mounting horizontal units, typically suspended.

Condensate Drain

Duct System

Electrical

Thermostat Connections

Safety Devices and the UPM Controller

UPM Controller Features

Details on UPM controller functions like anti-short cycle and random start.

LED Fault Indication

Explanation of LED indicators for fault codes.

Intelligent Reset

How the unit resets after fault conditions.

Sequence of Operation

Considerations

Important factors for wiring and installation.

Unit Options

Details on available unit options like Hot Gas Reheat.

Sequence of Operation - On;Off Control

Hot Gas Reheat Controllers

Special Considerations

Fluid Differential Pressure Switch (DPS)

Water Piping

Well Water Systems

Fresh Water Systems

Earth Coupled Systems

System Checkout

Pre-startup checks for earth coupled installations.

Unit Start-Up

Step-by-step procedure for starting the unit.

Heat Recovery Package

Details on the factory-mounted heat recovery option.

Water Tank Preparation

HR Water Piping

Piping requirements for the Heat Recovery system.

Water Tank Refill

Maintenance

In-Warranty Material Return

Unit Specifications

Typical Wiring Diagrams

Unit Check-Out Sheet

Troubleshooting

Insufficient Cooling or Heating

UPM Board Troubleshooting

Bosch BP Series Specifications

General IconGeneral
SeriesBP Series
Sound Power Level (Outdoor Unit)56-65 dB(A)
Heating Capacity Range18, 000 - 60, 000 BTU/h
Operating Temperature Range (Heating)-20°C to +35°C
Operating Temperature Range (Cooling)14° to 122°F

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