Bosch MC Series - Table of Contents

Installation, Operation, and Maintenance Manual
MC Series Heat Pumps - 8733850301 (2025/02) US
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Table of Contents
1 Document Conventions 5
1.1 Key to Symbols 5
1.1.2 Important information 5
1.1.3 Additional Symbols 5
1.2 General Safety Instructions 5
1.2.1 Refrigerant Safety Warnings 6
2 Model Nomenclature 8
3 General Description 9
3.1 Operating Limits 9
3.1.1 Environment 9
3.1.2 Power Supply 9
3.1.3 Unit Starting Conditions 9
3.2 Normal Operating Conditions 9
4 Inspecting and Storing the Equipment 10
4.1 Moving and Storage 10
4.2 Initial Inspection 10
4.3 Inspection and Unpacking Prior to Installation 10
5 Unit Installation 11
5.1 Location Selection 11
5.2 Minimum Conditioned Room Area 12
5.3 Protecting the Unit During Construction 13
5.4 Condensate Drain 13
5.5 Duct System 13
5.6 Piping 13
5.6.1 Installation of Pressure Regulating Valves 14
5.6.2 Discharge Water 14
5.6.3 Antifreeze 14
5.7 Electrical—Power Supply Wiring 15
5.7.1 Electrical Component Box Layout 15
5.7.2 High-Voltage Wiring 15
5.7.3 Units with Dual Power Supplies 16
5.7.4 Transformer Settings for 208/230-V Units 16
5.8 Electrical—Low-Voltage Wiring 16
5.8.1 Thermostat 16
5.8.2 Thermostats with a Malfunction Light 17
5.8.3 Thermostat to HVAC Equipment Wiring 17
5.8.4 Remote Sensor to Programmable Thermostat Wiring 17
5.8.5 VA Capacity 17
5.8.6 Low-Voltage VA Draw 18
6 Specific Application Considerations 19
6.1 Well Water Systems 19
6.2 Cooling Tower/Boiler Systems 20
7 Water-Quality Considerations 21
8 Post-Installation System Checkout 23
9 Pre-Start-Up 23
9.1 Checking Pulley Alignment and Belt Tensioning 23
9.2 Checking Scroll Compressor Rotation 23
9.2.1 Correcting Direction of Rotation 23
10 Start-up 24
10.1 Unit Start Up Cooling Mode 24
10.2 Unit Start Up Heating Mode 24
11 Commissioning 24
12 Safety Devices and the UPM Controller Overview 25
12.1 First-Stage UPM Board/s 25
12.2 Second-Stage UPM Board/s 26
12.3 UPM Default Settings and DIP Switch Positions 28
12.4 UPM Board Features 28
12.5 Leak Detection System 30
13 UPM Sequence of Operation 31
14 Unit Sequence of Operation by Mode 32
14.1 Cooling Mode 32
14.2 Heating Mode 32
15 Factory-Installed Options 33
15.1 Flow Proving Switch (DPS) 33
15.2 Boilerless Control 33
15.3 Variable Frequency Drive (VFD) 33
15.4 Phase Monitor 33
15.5 Hot Gas Reheat (HGRH) 33
15.5.1 Hot Gas Reheat Sequence of Operation—ON/OFF Control 33
15.6 Modulating Hot Gas Reheat (MHGRH) 33
15.6.1 MHGRH Sequence of Operation 33
15.7 Hot Gas Bypass 34
15.7.1 Limit Switch 34
15.8 Economizer 34
15.8.1 Economizer Sequence of Operation 34
16 Maintenance 35
16.1 Filter Changes 35
16.2 Annual Checkup 35
16.3 Annual Condensate Drain Cleaning 35
16.4 Blower Motor Lubrication (Optional) 35
16.5 Handling Periodic Lockouts 35
16.6 Installing Fan Motor Sheaves 35
16.7 Pulley Alignment and Belt Tensioning Procedure 36
16.7.1 Alignment 36
16.7.2 Evaporator Fan Performance Adjustment 36
16.7.3 Belt Tension Adjustment 36
17 Servicing and Repair Information 37
17.1 Conned Space Work 37
17.2 Controlled Work Procedure 37
17.3 Safety Checks 37
17.3.1 Inform Everyone in the General Work Area 37
17.3.2 Check for the Presence of Refrigerant 37
17.3.3 Fire Extinguisher 37
17.3.4 Ignition Sources 37
17.3.5 Ventilated Area 37
17.3.6 Checks to the Refrigerating Equipment 37
17.4 Checks to Electrical Devices 38
17.5 Repairs to Sealed Components 38
17.6 Repair to Intrinsically Safe Components 38
17.7 Check Cabling 38
17.8 Detection of Flammable Refrigerants 38
17.9 Removal and Evacuation 38
17.10 Charging Procedures 38
17.11 Recovery 39