Bosch BOVB 18 Series User manual

Bosch BOVB 18 Split System Heat Pump
Condensing Units Up to 18.5 SEER
2-3-4-5 Ton Capacity
R410A
Installation Instructions

2 |Bosch IDS BOVB 18 Installation Instructions
10.2020 |Bosch Thermotechnology Corp.Data subject to change

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

4 |Bosch IDS BOVB 18 Installation Instructions
10.2020 |Bosch Thermotechnology Corp.Data subject to change
1 Key to Symbols and Safety Instructions
1.1 Key to Symbols
Warnings
Warnings in this document are identified by a
warning triangle printed against a grey background.
Keywords at the start of a warning indicate the type and seriousness
of the ensuing risk if measures to prevent the risk are not taken.
The following keywords are defined and can be used in this document:
DANGER indicates a hazardous situation which, if not avoided, will result
in death or serious injury.
WARNING indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION indicates a hazardous situation which, if not avoided, could
result in minor to moderate injury.
NOTICE is used to address practices not related to personal injury.
Important information
This symbol indicates important information where
there is no risk to people or property.
1.2 Safety
Please read before proceeding
WARNING:ELECTRICALHAZARD380VOLTS DC
Failure to follow this warning could result in property
damage, severe personal injury, or death.
WAIT THREE (3) MINUTES after disconnecting power
prior to touching electrical components as they may hold a
dangerous charge of 380 VDC,then verify DC Voltage is less
than 42VDC at inverter TEST POINTS P-N (refer to wiring
diagram for test location).
NOTICE:
This document is customer property and is to remain with
this unit. Please return to service information pack upon
completion of work.
These instructions do not cover all variations in systems
or provide for every possible contingency to be met in
connection with the installation.
Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchaser’s purposes, the matter should be referred to your
installing dealer or local distributor.
The manufacturer recommends installing only approved
matched indoor and outdoor systems. All of the manufacturer’s split
systems are AHRI rated only with TXV indoor systems. Some of the
benefits of installing approved matched indoor and outdoor split
systems are maximum efficiency, optimum performance and the best
overall system reliability.
This document contains a wiring diagram and service information.
This is customer property and is to remain with this unit. Please return to
service information pack upon completion of work.
WARNING:
This information is intended for use by individuals
possessing adequate backgrounds of electrical and
mechanical experience. Any attempt to repair a central air
conditioning product may result in personal injury and/or
property damage.

Installation Instructions Bosch IDS BOVB 18 | 5
Bosch Thermotechnology Corp. |10.2020 Data subject to change
WARNING:HAZARDOUSVOLTAGE
Failure to follow this warning could result in property
damage, severe personal injury, or death.
Disconnect all electric power, Including remote disconnects
before servicing. Follow proper lockout/tagout procedures
to ensure the power cannot be inadvertently energized.
WARNING:REFRIGERANTOIL
Any attempt to repair a central air conditioning product may
result in property damage, severe personal injury, or death.
These units use R-410A refrigerant which operates at
50 to 70% higher pressures than R-22. Use only R-410A
approved service equipment. Refrigerant cylinders are
painted a “Rose” color to indicate the type of refrigerant
and may contain a “dip” tube to allow for charging of liquid
refrigerant into the system. All R-410A systems with variable
speed compressors use a PVE oil (FV50S or equivalent)
that readily absorbs moisture from the atmosphere to
limit this ‘hygroscopic“ action. The system should remain
sealed whenever possible. If a system has been open to
the atmosphere for more than 4 hours, the compressor oil
must be replaced. Never break a vacuum with air and always
change the driers when opening the system for component
replacement.
WARNING:HOTSURFACE
May cause minor to severe burning. Failure to follow this
Caution could result in property damage or personal injury.
Do not touch top of compressor.
CAUTION:CONTAINS REFRIGERANT
Failure to follow proper procedures can result in personal
illness or injury or severe equipment damage. System
contains oil and refrigerant under high pressure. Recover
refrigerant to relieve pressure before opening system.
CAUTION:INDOORUNITREQUIRED
The indoor units must be matched with TXV. The model of
TXV can be changed according to the system capacity.
CAUTION:GROUNDINGREQUIRED
Failure to inspect or use proper service tools may result
in equipment damage or personal injury. Reconnect all
grounding devices. All parts of this product that are capable
of conducting electrical current are grounded. If grounding
wires, screws, straps, clips, nuts, or washers used to
complete a path to ground are removed for service, they
must be returned to their original position and properly
fastened.
WARNING:SERVICEVALVES
Failure to follow this warning will result in abrupt release
of system charge and may result in personal injury and/
or property damage. Extreme caution must be exercised
when opening the Liquid Line Service valve. Turn valve stem
counterclockwise only until the stem contacts the rolled
edge.
WARNING:BRAZINGREQUIRED
Failure to inspect lines or use proper service tools may result
in equipment damage or personal injury. If using existing
refrigerant lines make certain that all joints are brazed, not
soldered.
WARNING:HIGHCURRENTLEAKAGE
Failure to follow this warning could result in property
damage, severe personal injury, or death.
Grounding is essential before connecting electrical supply.
WARNING:
This product can expose you to chemicals including Lead
and Lead components, which are known to the State
of California to cause cancer and birth defects or other
reproductive harm. For more information go to www.
P65Warnings.ca.gov.