Bosch EC Series

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Troubleshooting

Table 13 Compressor Troubleshooting

No compressor

operation

Cooling or

Heating

Is the Fault LED

blinking twelve (12)

times on the 1

stage UPMs?

Communication is lost

between the UPM 1

& UPM

stages.

Check the A2L sensor is going to

both the 1

and 2

stage UPMs.

Compressor Troubleshooting

Problem Mode Check Then Possible Cause Action

46 |

EC Series Heat Pumps — 8733841499 (2024/05)

Main Page

Table of Contents2
Document Conventions4
- Key to Symbols4
- General Safety Instructions4
Model Nomenclature7
General Description8
Inspecting and Storing the Equipment9
- Moving and Storage9
- Initial Inspection9
- Inspection and Unpacking Prior to Installation9
Unit Installation10
- Location Selection10
- Minimum Conditioned Room Area11
- Protecting the Unit During Construction12
- Take-Apart Construction Option12
- Mounting Vertical (VT) Units12
- Mounting Horizontal (HZ) Units12
- Condensate Drain12
- Duct System13
- Piping13
- Electrical-Power Supply Wiring15
- Electrical-Low-Voltage Wiring16
- Charging the Refrigeration Circuits (for Units with Take-Apart Construction Only)18
Specific Application Considerations19
- Well Water Systems19
- Cooling Tower/Boiler Systems20
Water-Quality Considerations21
Post-Installation System Checkout23
Pre-Start-Up23
- Checking Pulley Alignment and Belt Tensioning23
- Checking Scroll Compressor Rotation23
- Operating Limits23
Start-Up24
- Unit Start up Cooling Mode24
- Unit Start up Heating Mode24
Commissioning24
Safety Devices and the UPM Controller Overview25
- First-Stage UPM Board25
- Second-Stage UPM Board26
- UPM Default Settings and DIP Switch Positions28
- UPM Board Features28
- Leak Detection System30
Unit Sequence of Operation by Mode31
- Cooling Mode31
- Heating Mode31
Factory-Installed Options32
- Flow Proving Switch (DPS)32
- Boilerless Control32
- Variable Frequency Drive (VFD)32
- Phase Monitor32
- Hot Gas Reheat (HGRH)32
- Modulating Hot Gas Reheat (MHGRH)32
- Hot Gas Bypass33
- Economizer33
Maintenance34
- Filter Changes34
- Annual Checkup34
- Annual Condensate Drain Cleaning34
- Blower Motor Lubrication (Optional)34
- Handling Periodic Lockouts34
- Installing Fan Motor Sheaves34
- Pulley Alignment and Belt Tensioning Procedure35
Servicing and Repair Information36
- Confined Space Work36
- Controlled Work Procedure36
- Safety Checks36
- Checks to Electrical Devices37
- Repairs to Sealed Components37
- Repair to Intrinsically Safe Components37
- Check Cabling37
- Detection of Flammable Refrigerants37
- Removal and Evacuation37
- Charging Procedures38
- Recovery38
Decommissioning Information39
- Protecting the Environment39
- Decommissioning Procedure39
- Labeling39
Troubleshooting40
- Unit Troubleshooting40
Specification Tables47
- Blower Performance Table47
- Operating Temperatures and Pressures Table49
- Water-Side Pressure Drop Table55
Wiring Diagrams for Single-Phase Units57
- Two-Stage, Single-Phase Standard Unit with Belt-Drive Motor57
- Two-Stage, Single-Phase Unit with Optional Components and Belt-Drive Motor58
- Two-Stage, Single-Phase Unit with DDC, Optional Components, and Belt-Drive Motor59
- Two-Stage, Single-Phase Unit with Dual-Point Power and Belt-Drive Motor60
- Two-Stage, Single-Phase Unit with Dual-Point Power, Optional Components, and Belt-Drive Motor61
- Two-Stage, Single-Phase Unit with Dual-Point Power, DDC, Optional Components, and Belt-Drive Motor62
Wiring Diagrams for Three-Phase Units63
- Two-Stage, Three-Phase Standard Unit with Belt-Drive Motor63
- Two-Stage, Three-Phase Unit with Optional Components (MHGR) and Belt-Drive Motor64
- Two-Stage, Three-Phase Unit with DDC, Optional Components, and Belt-Drive Motor65
- Two-Stage, Three-Phase Standard Unit with Dual-Point Power and Belt-Drive Motor66
- Two-Stage, Three-Phase Unit with Dual-Point Power, Optional Components (MHGR), and Belt-Drive Motor67
- Two-Stage, Three-Phase Unit with Dual-Point Power, DDC, Optional Components, and Belt-Drive Motor68
- Two-Stage, Three-Phase Standard Unit with VFD Inverter-Duty Motor69
- Two-Stage, Three-Phase Unit with Optional Components (MHGR) and VFD Inverter-Duty Motor70
- Two-Stage, Three-Phase Unit with DDC, Optional Components, and VFD Inverter-Duty Motor71
- Two-Stage, Three-Phase Standard Unit with Dual-Point Power and VFD Inverter-Duty Motor72
- Two-Stage, Three-Phase Unit with Dual-Point Power, Optional Components (MHGR), and VFD Inverter-Duty Motor73
- Two-Stage, Three-Phase Unit with Dual-Point Power, Optional Components, and VFD Inverter-Duty Motor74
- Two-Stage, Three-Phase Standard Unit with VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control)75
- Two-Stage, Three-Phase Unit with Optional Components (MHGR) and VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control)76
- Two-Stage, Three-Phase Unit with DDC, Optional Components, and VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control)77
- Two-Stage, Three-Phase Standard Unit with Dual-Point Power and VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control)78
- Two-Stage, Three-Phase Unit with Dual-Point Power, Optional Components (MHGR), and VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control)79
- Two-Stage, Three-Phase Unit with Dual-Point Power, DDC, Optional Components, and VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control)80
Terminology81
- Acronyms81
- Terms81
Check-Out Sheet82
Notes83

Bosch EC Series - Page 46

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