Installation Instructions
Bosch IDS BOVA20 & BOVC20 Split System Heat Pump - BTC 761703107 A (12.2023)
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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 19
12.1 High Voltage Power Supply 19
12.2 High Voltage Disconnect Switch 19
12.3 High Voltage Ground 19
13 Start Up 20
13.1 System Start Up 20
14 System Charge Adjustment 21
14.1 Charging: Weigh-In Method 21
14.2 Subcooling Charging And Refrigerant Adjustment In Cooling
(Above 55°F Outdoor Temp.) 21
15 System Operation and Troubleshooting 24
15.1 Control Logic Description 24
15.2 Sensors (Thermistors/Pressure Transducer) 24
15.3 Pressure Equalizer Valve (PEV) 24
15.4 Defrost Description 24
15.5 Compressor Crankcase Heater Description 25
15.6 Reversing Valve Operation 25
15.7 Protection Functions 25
15.8 Fault Code Table 26
15.9 Parameter Point Check Table 27
15.10 Control Board Overviews 28
15.11 Error Code Troubleshooting 30
15.12 Temperature and Resistance Relationship Tables (for Sensors) 39
15.13 Temperature and Resistance Relationship Tables
(for T5 & Tf Sensors) 40
16 Wiring Diagram 41
17 Care and Maintenance 42
17.1 Cleaning Precautions 42
17.2 Maintenance – Pre-Season Inspection 42
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