Installation Instructions Bosch IDS BOVB 18 | 3
Bosch Thermotechnology Corp. | 10.2020
Data subject to change
Table of Contents
1 Key to Symbols and Safety Instructions 4
1.1 Key to Symbols 4
1.2 Safety 4
2 Unit Location Considerations 6
2.1 Unit Dimensions 6
2.2 Refrigerant Piping Limits 6
2.3 Location Restrictions 7
3 Unit Preparation 8
3.1 Prepare the Unit for Installation 8
4 Setting the Unit 8
4.1 Pad Installation 8
5 Refrigerant Line Considerations 9
5.1 Refrigerant Line and Service Valve Connection Sizes 9
5.2 Required Refrigerant Line Length 9
5.3 Refrigerant Line Insulation 9
5.4 Reuse Existing Refrigerant Lines 9
6 Refrigerant Line Routing 10
6.1 Precautions 10
7 Refrigerant Line Brazing 11
7.1 Braze The Refrigerant Lines 11
8 Refrigerant Line Leak Check 13
8.1 Check For Leaks 13
9 Evacuation 13
9.1 Evacuate the Refrigerant Lines and Indoor Coil 13
10 Service Valves 14
10.1 Open the Service Valves 14
11 Electrical - Low Voltage 15
11.1 Low Voltage Maximum Wire Length 15
11.2 Low Voltage Hook-Up Diagrams 15
11.3 Thermostat Wiring Diagrams 15
12 Electrical - High Voltage 20
12.1 High Voltage Power Supply 20
12.2 High Voltage Disconnect Switch 20
12.3 High Voltage Ground 20
13 Start Up 21
13.1 System Start Up 21
14 System Charge Adjustment 22
14.1 Charging: Weigh-In Method 22
14.2 Subcooling Charging And Refrigerant Adjustment In Cooling
(Above 55°F Outdoor Temp.) 22
15 System Operation and Troubleshooting 25
15.1 Control Logic Description 25
15.2 Sensors (Thermistors/Pressure Transducer) 25
15.3 Pressure Equalizer Valve (PEV) 25
15.4 Defrost Description 25
15.5 Compressor Crankcase Heater Description 26
15.6 Reversing Valve Operation 26
15.7 Protection Functions 26
15.8 Fault Code Table 27
15.9 Parameter Point Check Table 28
15.10 Control Board Overviews 29
15.11 Error Code Troubleshooting 31
15.12 Temperature and Resistance Relationship Tables (for Sensors) 37
15.13 Temperature and Resistance Relationship Tables (for T5) 38
16 Wiring Diagrams 40
16.1 BOVB36-18 (3 ton) 40
16.2 BOVB60-18 (5 ton) 41
17 Care and Maintenance 42
17.1 Cleaning Precautions 42
17.2 Maintenance – Pre-Season Inspection 42
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