Bosch IDS BOVA15 User manual

Installation Instructions
Split System Heat Pump
Bosch IDS BOVA15
IDS Light Condensing Units | 2-5 Ton Capacity | R410A
BTC 761701317 A / 02.2022

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
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 17
12.1 High Voltage Power Supply 17
12.2 High Voltage Disconnect Switch 17
12.3 High Voltage Ground 17
13 Start Up 18
13.1 System Start Up 18
14 System Charge Adjustment 19
14.1 Charging: Weigh-In Method 19
14.2 Subcooling Charging And Refrigerant Adjustment In Cooling
(Above 55°F Outdoor Temp.) 19
15 System Operation and Troubleshooting 22
15.1 Control Logic Description 22
15.2 Sensors (Thermistors/Pressure Transducer) 22
15.3 Pressure Equalizer Valve (PEV) 22
15.4 Defrost Description 22
15.5 Compressor Crankcase Heater Description 23
15.6 Reversing Valve Operation 23
15.7 Protection Functions 23
15.8 Fault Code Table 24
15.9 Parameter Point Check Table 25
15.10 Control Board Overviews 26
15.11 Error Code Troubleshooting 28
15.12 Temperature and Resistance Relationship Tables (for Sensors) 37
15.13 Temperature and Resistance Relationship Tables (for T5 Sensor) 38
16 Wiring Diagram 39
16.1 BOVA24/36-15 (2/3 Ton) 39
16.2 BOVA60-15 (4/5 Ton) 40
17 Care and Maintenance 41
17.1 Cleaning Precautions 41
17.2 Maintenance – Pre-Season Inspection 41

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
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:ELECTRICALHAZARD380 VOLTS 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.
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.

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
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 POE oil (VG74 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 should 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:HIGHCURRENT LEAKAGE
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.

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
2 Unit Location Considerations
2.1 Unit Dimensions
Models Hx W xL (inches)
BOVA24-15 24-15/16 x 28 x 28
BOVA36-15 24-15/16 x 28 x 28
BOVA60-15 33-3/16 x 29-1/8 x 29-1/8
Table 1
The unit’s weight values are on the carton box.
When mounting the outdoor unit on a roof, be sure the roof will support the unit’s
weight. Properly selected isolation is recommended to prevent sound or vibration
transmission to the building structure.
Figure 1
2.2 Refrigerant Piping Limits
System
Capacity
Model
Liquid
Line
Suction
Line
TotalEquivalent Length- Feet
25 50 75 100
InchO.D. Maximum Vertical Separation - Feet
24K 3/8 * 3/4 Std. 25 50 45 40
5/8 Opt. 25 50 45 40
36K 3/8 * 3/4 Std. 25 50 50 50
5/8 Opt. 25 50 50 50
48K 3/8 * 7/8 Std. 25 50 50 40
3/4 Opt. 25 50 50 40
60K 3/8 *
7/8 Std. 25 50 50 40
3/4 Opt. 25 50 50 40
1 1/8 Opt. 25 40 N/A N/A
Table 2
* Standard line size is recommended;
N/A: Application not recommended;
Refrigerant charge: refer to Sec. 14
Maximum line equivalent length = 100 feet.
Maximum vertical equivalent length = 50 feet.
Use only the line diameters indicated in Table 2.
If the suction linesets are greater than 50 feet, do not use a larger suction
line than recommended.
Figure 2
Standard Lineset
Lineset 100' Max
Line Length
50' Max
Line Lift
50' Max
Line Lift

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
2.3 Location Restrictions
Ensure the top discharge area is unrestricted for at least 60 inches above the unit.
Do not locate outdoor unit near bedrooms since normal operational sounds may be
objectionable.
Position unit to allow adequate space for unobstructed airflow, wiring, refrigerant
lines, and serviceability.
Allow a minimum of 12 in. clearance on one side of control board access panel to a
wall and a minimum of 24 in. on the adjacent side of control board access panel.
Maintain a distance of 24 in. between units.
Position unit where water, snow, or ice from roof or overhang cannot fall directly on
unit.
See Fig. 3 and Fig. 4.
Figure 3
Avoid Installations
Near Bedrooms
Min. 60" Unrestricted
Min. 12" to
Shrubbery
Min. 24"
Unrestricted
Access Panel
Figure 4
Min. 12" to
Shrubbery
Access Panel
Min. 24" to
Wall
Cold climate considerations (heat pump only)
Precautions must be taken for units being installed in areas where
snow accumulation and prolonged below-freezing temperatures occur.
Units should be elevated 3-12 inches above the pad or rooftop,
depending on local weather. This additional height will allow drainage of
snow and ice melted during defrost cycle prior to its refreezing. Ensure
that drain holes in unit base pan are not obstructed, which could prevent
the drainage of defrost water (Fig. 5).
If possible, avoid locations that are prone to snow drifts. If not possible,
a snow drift barrier should be installed around the unit to prevent a build-
up of snow on the sides of the unit.
Figure 5
Min. 12"
Snow
barrier
3-12" Elevation
Snow legs
Pad
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Corrosive Environment
Exposure to a corrosive environment may shorten the life of the equipment,
corrode metal parts, and/or negatively affect unit performance. Corrosive elements
include, but are not limited to: sodium chloride, sodium hydroxide, sodium sulfate,
and other compounds commonly found in ocean water, sulfur, chlorine, fluorine,
fertilizers, and various chemical contaminants from industry/manufacturing plants.
If installed in areas which may exposed to corrosive environments, special attention
should be given to the equipment placement and maintenance.
Lawn sprinklers/hoses/waste water should not spray directly on the unit
cabinet for prolonged periods of time.
In coastal areas: locate the unit on the side of the building away from the
waterfront.
Fencing or shrubbery may provide some shielding protection to the unit,
however minimum unit clearances must still be maintained.
Approximately every three months, wash the outdoor coil and any
exposed cabinet surfaces.

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
3 Unit Preparation
3.1 Prepare the Unit for Installation
Check for damage and report promptly to the carrier any damage found to
the unit (Fig. 6).
The charge port can be used to ensure the refrigerant charge has been
retained during shipment.
Figure 6
4 Setting the Unit
4.1 Pad Installation
When installing the unit on a support pad, such as a concrete slab, consider the
following:
The pad must be at least 1-2” larger than the unit on all sides.
The pad must be separated from any structure.
The pad must be level.
The pad must be high enough above grade to allow for drainage.
The pad location must comply with National, State, and local codes.
These instructions are intended to provide a method to tie-down system
to cement slab as a securing procedure for high wind areas. Check local
codes for tie-down methods and protocols.
Figure 7
Figure 8
#7 X 3/8" Self-tapping screws
(Do not exceed 3/8" length screws!)
Detail A
See Section 2.1
for unit dimensions
See Detail A
Field-supplied brackets:
2" width, 1/16" thickness,
height as required.
1/4” Χ 1-1/2” Hex washer head concrete screws
(3/16” pilot hole needed. Pilot hole should be 1/4” deeper
than the fastener embedment)

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
5 Refrigerant Line Considerations
5.1 Refrigerant Line and Service Valve Connection Sizes
Models SuctionLine LiquidLine SuctionLine
Connection
LiquidLine
Connection
Dimensionsin inches
BOVA24-15 3/4 3/8 3/4 3/8
BOVA36-15 3/4 3/8 3/4 3/8
BOVA60-15 7/8 3/8 7/8 3/8
Table 3
5.2 Required Refrigerant Line Length
Determine required line length (Fig. 9). Refer to Section 2.2.
Figure 9
Line Length
5.3 Refrigerant Line Insulation
The Suction Line must always be insulated. DO NOT allow the Liquid Line
and Suction Line to come in direct (metal to metal) contact.
Figure 10
Liquid Line Suction Line
Insulation
5.4 Reuse Existing Refrigerant Lines
CAUTION:MINORTOMODERATE BURNS
If using existing refrigerant lines, make certain that all joints
are brazed, not soldered.
For retrofit applications, where the existing refrigerant lines will be used, the
following precautions should be taken:
Ensure that the refrigerant lines are the correct size. Refer to Section 2.2
and Table 2.
Ensure that the refrigerant lines are free of leaks, acid, and oil.
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. The benefits of installing approved
matched indoor and outdoor split systems are maximum efficiency,
optimum performance and the best overall system reliability.

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
6 Refrigerant Line Routing
6.1 Precautions
Take precautions to prevent noise within the building structure due to
vibration transmission from the refrigerant lines. For example:
When the refrigerant lines have to be fastened to floor joists or
other framing in a structure, use isolation type hangers.
Isolation hangers should also be used when refrigerant lines are
run in stud spaces or enclosed ceilings.
Where the refrigerant lines run through a wall or sill, they should
be insulated and isolated.
Isolate the lines from all ductwork.
Minimize the number of 90º turns.
Figure 11
Side View
8 Feet Maximum
8 Feet Maximum
Joist/Rafter
Isolator
Lineset
Secure Suction Line from joists using isolators every 8 ft. Secure Liquid Line
directly to Suction Line using tape, wire, or other appropriate method every 8 ft.
Isolation From Joist/Rafter
Figure 12
Side View
8 Feet Maximum
8 Feet Maximum
Wall
Isolator
Linesets
Secure Suction Line using isolators every 8 ft. Secure Liquid Line directly to
Suction Line using tape, wire, or other appropriate method every 8 ft.
Isolation On Walls
Comply with National, State, and local codes when isolating linesets
from joists, rafters, walls, or other structural elements.

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
Figure 13
Isolator
Lineset
Ductwork
Suction Line
Sealant
Insulation
Wall
Isolation Through Wall DO NOT hang linesets from ductwork
7 Refrigerant Line Brazing
7.1 Braze The Refrigerant Lines
1. Remove caps or plugs. Use a deburring tool to deburr the pipe ends. Clean
both internal and external surfaces of the tubing using an emery cloth.
Figure 14

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
2. Remove the pressure tap cap from both service valves.
Figure 15
3. Purge the refrigerant lines and indoor coil with dry nitrogen.
Figure 16
This pipe
must have
a thimble
4. Wrap a wet rag around the valve body to avoid heat damage and continue the
dry nitrogen purge (Fig. 17).
Braze the refrigerant lines to the service valves.
Braze the filter drier to the Liquid Line.
All units come standard with a bi-flow filter drier. Braze the filter drier to
the liquid line, using caution not to push the refrigerant line too hard past
the stop within the filter drier (this could damage the drier).
Continue the dry nitrogen purge. Do not remove the wet rag until all brazing
is completed.
Remove the wet rag before stopping the dry nitrogen purge.
Figure 17
Shipped in package
field installed
3-4" from valve
5. Replace the pressure tap caps after the service valves have cooled.
Figure 18

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Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
8 Refrigerant Line Leak Check
8.1 Check For Leaks
1. Pressurize the refrigerant lines and evaporator coil to 150 PSIG using dry
nitrogen.
Figure 19
150 PSI
G
2. Check for leaks by using a soapy solution or bubbles at each brazed location.
Figure 20
9 Evacuation
9.1 Evacuate the Refrigerant Lines and Indoor Coil
Do not open the service valves until the refrigerant lines and indoor coil
leak check and evacuation are complete.
1. Evacuate until the micron gauge reads no higher than 350 microns, then
close the valve to the vacuum pump.
Figure 21
0350
Microns
ON OFF
2. Observe the micron gauge. Evacuation is complete if the micron gauge does
not rise above 500 microns in one (1) minute.
Once evacuation is complete, turn off the vacuum pump and micron gauge,
and close the valves on the manifold gauge set.
Figure 22
1MIN.

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Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
10 Service Valves
10.1 Open the Service Valves
WARNING:MODERATE TO SEVERE BURNS
Extreme caution should be exercised when opening the
Liquid Line Service Valve. Turn counterclockwise until
the valve stem just touches the rolled edge. No torque is
required. Failure to follow this warning will result in abrupt
release of system charge and may result in personal injury
and /or property damage.
Leak check and evacuation must be completed before opening the
service valves. The brazed lineset valves should be used for leak
checking and vacuuming. Using the separate suction port for this
process will result in loss of charge.
The Suction Service Valve must be opened first BEFORE opening the
Liquid Service Valve.
1. Remove Service Valve Cap (Fig. 23).
2. Fully insert hex wrench into the stem and back out counterclockwise until
valve stem just touches the rolled edge (approximately five (5) turns.)
3. Replace the Valve Stem Cap to prevent leaks. Tighten finger tight plus an
additional 1/6 turn.
4. Repeat STEPS 1 - 3 for Liquid Service Valve.
Figure 23
Cap
5/16" Hex Wrench
for Suction Service Valve
3/16" Hex Wrench
for Liquid Service Valve
Rolled Edge to
Captivate Stem
Hex Headed
Valve System
Service Port
Unit Side
of Service
Valve

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
11 Electrical - Low Voltage
11.1 Low Voltage Maximum Wire Length
Table 4 defines the maximum total length of low voltage wiring from the outdoor
unit, to the indoor unit, and to the thermostat.
24Volts- Wire size Max.Wire Length
18 AWG 150 Ft.
16 AWG 225 Ft.
14 AWG 300 Ft.
Table 4
11.2 Low Voltage Hook-Up Diagrams
Figure 24
NOTES:
- Low voltage connection must be made inside the
outdoor unit control board access panel.
- There is no terminal block for low voltage connections,
wires must be spliced using field supplied wire nuts
- Field supplied wire nuts should be 22-16 gauge.
- Refer to unit wiring diagram for more information.
Control
Board
Access
Panel
Low Voltage Unit Connections
11.3 Thermostat Wiring Diagrams
Be sure power supply agrees with equipment nameplate.
Power wiring and grounding of equipment must comply with local codes.
Low voltage wiring to be No. 18 AWG minimum conductor.
“- - - - - - - -” Field installed electric auxiliary heat connection
Single-stage auxiliary heating supported by 2H thermostat
Twin-stage auxiliary heating supported by 3H thermostat
W1: The first stage of field installed electric auxiliary heat.
W2: The second stage of field installed electric auxiliary heat.
The outdoor unit W signal is connected to the electric auxiliary heat or
the first stage electric auxiliary heat.
Figures 25-30 refer to thermostat wiring diagrams for the BOVA15 and
BVA15 manufacturer matched indoor and outdoor systems.
Dashed lines in the following thermostat wiring diagrams refer to optional
wiring (wiring for Passive Dehumidification Function and/OR Electric
Heat). For thermostat wiring please refer to the Owner’s Manual of the
thermostat.
B terminal to be connected with thermostat (O/B) wiring. Reversing valve
energizes in heating.
Figure 25

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
Figure 26 Thermostat Wiring Diagram for BOVA15/BVA15 Matched System

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
12 Electrical - High Voltage
12.1 High Voltage Power Supply
WARNING:LIVEELECTRICALCOMPONENTS!
During installation, testing, servicing, and trouble shooting
of this product, it may be necessary to work with live
electrical components. Failure to follow all electrical safety
precautions when exposed to live electrical components
could result in death or serious injury.
The high voltage power supply must match the equipment nameplate
(208/230V, 1PH, 60Hz).
Power wiring must comply with national, state, and local codes.
Follow instructions on unit wiring diagram located on the inside of the control box
access panel and refer to wiring diagram in this IOM.
12.2 High Voltage Disconnect Switch
Install a separate disconnect switch at the outdoor unit.
Field supplied flexible electrical conduit must be used for high voltage wiring.
Figure 27
12.3 High Voltage Ground
Ground the outdoor unit per national, state, and local code requirements.
Figure 28

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
13 Start Up
13.1 System Start Up
1. Ensure Sections 7, 8, 9, 10, 11, and 12 have been completed.
2. Set System Thermostat to OFF.
Figure 29
3. Turn on disconnect to apply power to the indoor and outdoor units.
Figure 30
ON
OFF
4. Upon initial unit installation, wait one (1) hour before starting the unit if
compressor crankcase heater is used and the outdoor ambient temperature
is below 70 ºF.
Figure 31
60 MIN.
5. Set system thermostat to ON.
Figure 32

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
14 System Charge Adjustment
14.1 Charging: Weigh-In Method
Use weigh-in method the initial installation, or anytime a system charge is being
replaced. Weigh-in method can also be used when power is not available to the
equipment site or operating conditions (indoor/outdoor temperatures) are not in
range to verify with the subcooling charging method.
Model Factory Charge
Charge multiplier for
interconnecting refrigerant
tube length
2 Ton 5 lbs 7 oz 0.6 oz/ft
3 Ton 6 lbs 11 oz 0.6 oz/ft
4 & 5 Ton 9 lbs 8 oz 0.6 oz/ft
Table 5
Refer to Table 3 on Page 9 for Line Size considerations.
The factory charge in the outdoor unit is sufficient for 15 feet of standard
size interconnecting liquid line.
New Installations — Calculating additional charge for lineset greater than 15
ft.
1. Total Line Length (ft) = _________(a)
2. Standard Lineset (ft) = 15 (b)
3. (a) minus (b) = _________(c)
4. Refrigerant Multiplier = 0.6 oz/ft (d)
5. Refrigerant Adder (c*d) = _________(e)*
*If lineset is less than 15 ft, (e) = 0
Sealed-System Repairs — Calculating total system charge.
1. Total Line Length (ft) = _________(a)
2. Standard Lineset (ft) = 15 (b)
3. (a) minus (b) = _________(c)
4. Refrigerant Multiplier = 0.6 oz/ft (d)
5. Refrigerant Adder (c*d) = _________(e)*
6. Factory Charge (namplate) = _________(f)
7. Total System Charge (e+f) = ________ _
*If lineset is less than 15 ft, (e) = 0
The only mode approved for validating system charge is while in Cooling
"Force Mode". Outdoor temperature must be between 55°F and 120°F
with indoor temperature kept between 70°F and 80°F.
14.2 Subcooling Charging And Refrigerant Adjustment In Cooling
(Above 55°F Outdoor Temp.)
1. Check the outdoor ambient temperatures.
Subcooling (in cooling mode) is the only recommended method of charging
above 55ºF outdoor ambient temperatures.
For outdoor ambient temperatures below 55ºF use weigh-in charge method.
It is important to return in the spring or summer to accurately charge the
system in the cooling mode when outdoor ambient temperature is above
55ºF.
Figure 33
55ºF
Outdoor Temp1
120ºF
Outdoor
Temperature
Above 55ºF
55ºF
Outdoor Temp2
Outdoor
Temperature
Below 55ºF
For best results, the indoor temperature should be kept between 70ºF and
80ºF during the install.
Figure 34
80 ºF
70ºF
Indoor Temp
2. Ensure Sections 7,8,9,10,11,12 and 13 have been completed.

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
3. Stabilize the system.
After starting the system in cooling mode, short press “FORCE” button,
and “ ” symbol should appear. System may take 10 minutes to ramp up.
Operate the system for a minimum of twenty (20) minutes.
After a twenty (20) minute stabilization period operating at 100%
capacity (i.e. once the compressor reaches the frequency shown in Table
6), maintain continuous operation while adjusting refrigerant charge.
After adjusting, operate system for a minimum of five (5) minutes for
system to stabilize, otherwise repeat step 3.
CompressorFrequencyin ForceMode inCooling
ODUCapacity 2TON 3TON 4TON 5TON
Frequency(HZ) 46 66 54 60
Table 6
Figure 35
20 MIN.
4. Calculate superheat value (According to Table 7)
Measured Suction Line Temp = ________ºF
Measured Suction Line Pressure = _______ PSIG
Calculate superheat value = ________ºF
For indoor unit with adjustable TXV, set subcooling and adjust superheat
via adjustable TXV according to Table 9. For indoor unit with non-
adjustable TXV, check the superheat and set correct subcooling
according to superheat, refer to Table 9.
5. Calculate subcooling value (According to Table 8)
Measured Liquid Line Temp. = ________ºF
Measured Liquid Line Pressure = _______ PSIG
Calculate subcooling value = ________ºF
Figure 36
Insulation
If calculated subcooling value is lower than the design subcooling value
(Table 9), please add refrigerant. Repeat steps 3 through 5.
If the superheat is out of range, refer to Troubleshooting section of this
IOM.
Suction
Temp
(°F)
FinalSuperheat(°F)
6 8 10 12 14 16 18 20 22
Suction Gauge Pressure(PSI)
40 105 101 97 93 89 86 82 78 75
42 109 105 101 97 93 89 86 82 78
44 114 109 105 101 97 93 89 86 82
46 118 114 109 105 101 97 93 89 86
48 123 118 114 109 105 101 97 93 89
50 128 123 118 114 109 105 101 97 93
52 133 128 123 118 114 109 105 101 97
54 138 133 128 123 118 114 109 105 101
56 143 138 133 128 123 118 114 109 105
58 148 143 138 133 128 123 118 114 109
60 153 148 143 138 133 128 123 118 114
62 159 153 148 143 138 133 128 123 118
64 164 159 153 148 143 138 133 128 123
66 170 164 159 153 148 143 138 133 128
68 176 170 164 159 153 148 143 138 133
70 182 176 170 164 159 153 148 143 138
72 188 182 176 170 164 159 153 148 143
Table 7 R-410A Refrigerant chart - Final Superheat
Liquid
Temp
(°F)
FinalSubcooling(°F)
678910111213
Liquid Gauge Pressure(PSI)
55 173 176 179 182 185 188 191 195
60 188 191 195 198 201 204 208 211
65 204 208 211 215 218 221 225 229
70 221 225 229 232 236 239 243 247
75 239 243 247 251 255 259 262 266
80 259 262 266 270 275 279 283 287
85 279 283 287 291 295 300 304 309
90 300 304 309 313 318 322 327 331
95 322 327 331 336 341 346 351 355
100 346 351 355 360 365 370 376 381
105 370 376 381 386 391 397 402 407
110 397 402 407 413 418 424 430 435
115 424 430 435 441 447 453 459 465
120 453 459 465 471 477 483 489 496
125 483 489 469 502 508 515 521 528
Table 8 R-410A Refrigerant chart - Final Subcooling