Bosch EC Series

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Bosch Thermotechnology Corp.

65 Grove Street

Watertown, MA 02472

Tel: +1 (800) 283-3787

Fax: +1 (603) 965-7568

8733841499 | Revis

ed 05/2024

Bosch Thermotechnology Corp. reserves the right

to make changes without notice due to continuing

engineering and technological advances.

Additional Product Information Page

To see additional product information and documentation,

leas

e visit the product page:

www.bosch-homecomfort.com/us/ or scan the QR code below.

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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 84

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