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Bosch EP024 - User Manual

Bosch EP024
44 pages
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Installation and Maintenance Manual
EP Series
8733953041 (2019/01)
EP007, EP009, EP012, EP015, EP018, EP024, EP030, EP036, EP042, EP048, EP060,EP070

Table of Contents

Questions and Answers

  • L
    Lisa KimAug 17, 2025
    What to do if my Bosch EP024 Heat Pump is off on high pressure control?
    • T
      tammy41Aug 17, 2025
      If your Bosch Heat Pump shuts off due to high pressure, it could be due to several reasons. In cooling mode, check for inadequate water flow, excessively warm entering water temperature, or a scaled or plugged condenser. In heating mode, ensure adequate airflow by checking for an inoperative blower, clogged filter, or restrictions in the ductwork. Also, the unit might be overcharged with refrigerant, so reclaim the excess, evacuate, and recharge it with the factory-recommended amount. Finally, inspect the high-pressure switch for defects or improper calibration.
  • M
    Mary StarkAug 22, 2025
    Why is the blower operating but the compressor not in my Bosch EP024?
    • H
      hatkinsonAug 22, 2025
      If your Bosch Heat Pump's blower is running but the compressor isn't, check the thermostat settings, calibration, and wiring. Inspect for loose or broken wires at the compressor, capacitor, or contactor. Check the UPM board's red default LED for a Blink Code. If the compressor is cool and the overload won't reset, it may need replacement. A compressor motor grounded internally to the shell also necessitates replacement. After the compressor cools, check the continuity of its windings; open windings indicate the need for a replacement.
  • T
    Tina MarquezAug 27, 2025
    What causes a Bosch Heat Pump to turn off on low pressure control?
    • K
      Kurt MorenoAug 27, 2025
      If your Bosch Heat Pump is turning off due to low pressure, the suction pressure might be too low. In cooling mode, this could be due to inadequate airflow, excessively cold entering air temperature, an inoperative blower, a clogged filter, or ductwork restrictions. In heating mode, it could be due to inadequate water flow, excessively cold entering water temperature, or a scaled or plugged condenser. Also, the unit might be low on refrigerant, so check for leaks, repair them, evacuate the system, and recharge it with the factory-recommended amount. Finally, inspect the low-pressure switch for defects or improper calibration.
  • R
    richard14Sep 1, 2025
    Why does my Bosch EP024 Heat Pump unit short cycle?
    • K
      Kiara OlsenSep 1, 2025
      If your Bosch Heat Pump is short cycling, it might be oversized for the space, so recalculate the 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.
  • T
    turnerlisaNov 6, 2025
    How to troubleshoot a Bosch Heat Pump that does not run?
    • D
      Danielle CordovaNov 6, 2025
      If your entire Bosch Heat Pump unit isn't running, start by ensuring the power supply is on and the disconnect is closed. Check for blown fuses and replace them or reset the circuit breaker, making sure you're using the correct fuses. If the voltage supply is lower than the minimum specified on the unit's data plate, contact your local power company. Also, check the thermostat settings, calibration, and wiring. Set the fan to “ON”—it should run. Set the thermostat to “COOL” at the lowest temperature; the unit should cool. Set it to “HEAT” at the highest temperature; the unit should heat. If the blower or compressor doesn't run in any of these cases, the thermostat might be miswired or faulty. Verify 24 volts at the low voltage terminal strip between “R” and “C”, “Y” and “C”, and “O” and “C...
  • J
    johnsonvincentNov 11, 2025
    Why is my Bosch EP024 Heat Pump providing insufficient cooling or heating?
    • A
      Andre StaffordNov 11, 2025
      If your Bosch Heat Pump isn't providing enough cooling or heating, several factors could be at play. First, the unit might be undersized, so recalculate the heating or cooling loads. Adding insulation and shading might help. Check for air leaks in the ductwork or from outside through doors and windows. Ensure adequate airflow and proper air distribution, and replace any dirty filters. A low refrigerant charge can cause inefficient operation, so check the refrigerant levels. Inspect the compressor for defects; low discharge and high suction pressure indicate it's not pumping correctly, so replace it if needed. A defective reversing valve can also cause problems by bypassing refrigerant, so consider replacing it. Compare operating pressures to the unit's pressure/temperature chart. Check the...

Summary

Installation

Mounting Vertically

Instructions for vertically mounting EP Series units, including pad requirements.

Mounting Horizontally

Instructions for horizontally mounting EP Series units, including ceiling suspension.

Hanging Bracket Kit

Condensate Drain

Proper connection and installation of the condensate drain line.

Duct System

Piping

Electrical

Requirements for field wiring, power supply, and grounding.

Thermostat Connections

Wiring instructions for connecting thermostats to the unit's control interface.

Safety Devices and the UPM Controller

UPM Controller Features

Details on UPM board settings, timers, and protection features like freeze sensing.

Electronic Thermostat Installation

Thermostat Wiring

UPM Sequence of Operation

Cooling Mode Operation

Heating Mode Operation

Electric Heater Package Option

Heat Recovery Package

Application Considerations

Installation of Pressure Regulating Valves

Geothermal (Earth-Coupled) Systems

System Checkout

Unit Start-Up

Procedures for performing a final system checkout and unit startup.

Maintenance

Troubleshooting

Unit Troubleshooting

Common problems, possible causes, and checks for troubleshooting.

Refrigerant Pressure Ranges

Wiring Diagrams

Electric Heat Wiring Diagram

Bosch EP024 Specifications

General IconGeneral
Model NumberEP024
CategoryHeat Pump
RefrigerantR410A
Dimensions (HxWxD)800 x 600 x 300 mm
Noise Level45 dB

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