Bosch IDP Premium BRBA-60HWD1N1-M18 User manual

Installation Instructions
Inverter Ducted Packaged Heat Pump
Bosch IDP Premium
18 SEER2 Series | 5 Ton Capacity | R410A
BTC 761703104 A |11.2022

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
Table of Contents
1 Key to Symbols and Safety Instructions 4
1.1 Key to Symbols 4
1.2 Safety 4
2 Component Location 6
3 Dimensions 7
3.1 Unit Dimensions 7
3.2 Dimensions - Back and Bottom 8
3.3 Dimensions - Right and Top 9
4 Installation 10
4.1 Pre-Installation 10
4.2 Rigging And Lifting 10
4.3 Location Restrictions 10
4.4 Rooftop Installation - Curb Mounting 12
5 Airflow Performance 13
6 Indoor Fan Motor Function 14
7 Ductwork 14
8 Condensate Drain Connection 16
8.1 Install Drain Pipe 16
9 Air Filter (Not Factory-Installed) 16
10 Electrical Wiring 17
10.1 Power Wiring 17
10.2 Grounding 17
10.3 Control Wiring 17
11 Start Up 19
11.1 System Start Up 19
12 System Charge Adjustment 20
12.1 Charging: Weigh-In Method 20
12.2 Subcooling Charging and Refrigerant Adjustment In Cooling
(Above 55°F Outdoor Temp.) 20
13 System Operation and Troubleshooting 22
13.1 Control Logic Description 22
13.2 Sensors (Thermistors/Pressure Transducer) 22
13.3 Defrost Description 23
13.4 Compressor Crankcase Heater Description 23
13.5 Reversing Valve Operation 23
13.6 Protection Functions 24
13.7 Fault Code Table 25
13.8 Parameter Point Check Table 26
13.9 Control Board Overview 27
13.10 Error Code Troubleshooting 28
13.11 Temperature and Resistance Relationship Tables (for Sensors) 34
13.12
Temperature and Resistance Relationship Tables (for T5 & Tf Sensors ) 35
13.13 Wiring Diagram 36
14 Maintenance 37
14.1 Cleaning Precautions 37
14.2 Regular Maintenance 37

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
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
DANGER:HIGHVOLTAGE
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.
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.
WARNING:ELECTRICALSHOCK
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.

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
WARNING:PERSONAL INJURY/ENVIRONMENTALHAZARD
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.
CAUTION:HOTSURFACE
Do not touch top of compressor. May cause minor to
severe burning. Failure to follow this Caution could result in
property damage or personal injury.
CAUTION:HIGHPRESSURE
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.
WARNING:GROUNDING REQUIRED
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.
CAUTION:BURNHAZARD
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 applying gauges to service ports.
WARNING:ELECTRICALSHOCK
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 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
2 Component Location
Figure 1
Outdoor Fan
T3L
T3
Th
Tf
T4
T2
COMP
EEV
PT
T5
Service Valves
HPS
RV
Indoor Fan
Component Descriptions Component Descriptions
HPS High pressure switch T3L Condensor outlet temp. sensor
PT Pressure transducer Tf Radiator temp. sensor
T2 Indoor coil temp. sensor Th Comp. return temp. sensor
T3 Condenser temp. sensor EEV Electronic expansion valve
T4 Ambient temp. sensor RV Reversing valve
T5 Comp. discharge temp. sensor COMP Compressor
Table 1 Component Descriptions

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
3 Dimensions
3.1 Unit Dimensions
Figure 2
2-1/4"6-5/8" 6-5/8"
15-1/2"8-1/16"
W
2-3/16"
5-1/2"
6-5/8" 6-5/8"
9-5/16"
B
L
Front
H
A
2-3/8"
.
.
.
HeatPumpModel L W H A B
BRBA-60HWD1N1-M18 51-9/16" 44-13/16" 51-7/16" 47-5/16" 19-11/16"
Table 2 Unit Dimensions
HeatPumpModel Net Weight Gross Weight
BRBA-60HWD1N1-M18 556 lbs (252 kg) 591 lbs (268 kg)
Table 3 Unit Weights

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
3.2 Dimensions - Back and Bottom
Figure 3
Bottom view
4-3/4" 12-15/16"
OPTIONAL
RETURN
AIR OPENING
OPTIONAL
SUPPLY
AIR OPENING
C
2-3/16"
DEE
F
Back view
6-3/16"
5-3/16" H13-9/16"
SUPPLY
DUCT
OPENING
RETURN
DUCT
OPENING
H
G
HeatPumpModel C D E F G H
BRBA-60HWD1N1-M18 49-1/4" 42-1/2" 14-1/8" 16-1/8" 15-7/8" 13-7/8"
Table 4 Dimensions - Back and Bottom

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
3.3 Dimensions - Right and Top
Figure 4
Top View
Right side view
Condensate drain connection
3/4" NPT (Trap required)
22-3/8"
4-9/16"
8-1/16" 6-5/8" 15-1/2" 6-5/8"

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
4 Installation
4.1 Pre-Installation
Before installation, carefully check the following:
1. Unit should be installed in accordance with national and local safety
codes, including but not limited to ANSI/NFPS No. 70, local plumbing and
wastewater codes and any other applicable codes.
2. For rooftop installation, be sure the structure has enough strength to
support the weight of unit. Unit must be installed on a field supplied roof
curb or rack and leveled.
3. For ground level installation, a field supplied level slab must be used.
4. Condenser airflow should not be restricted.
5. On applications when a roof curb is used, the unit must be positioned on
the curb so the front of the unit is tight against the curb. If the unit is to
be mounted on a curb in a downflow application, refer to Figure 13, and
convert panels prior to rigging and lifting. The panel removal process may
require the unit to be on the ground.
4.2 Rigging And Lifting
Figure 5
Unit Height
Minimum Height 36"
Exercise care when moving the unit. Do not remove any packaging until the unit is
near the place of installation. Rig the unit by attaching chain or cable slings to the
lifting holes provided in the base rails. Spreader bars, whose length exceeds the
largest dimension across the unit, MUST be used across the top of the unit.
When rigging/lifting the unit, the minimum height between the top of the rigging
cables' connection point and top of unit should be 36 in. Refer to Figure 5.
CAUTION:
Before lifting, make sure the unit weight is distributed
equally on the rigging cables so it will lift evenly.
CAUTION:
All panels must be secured in place when the unit is lifted.
The condenser coils should be protected from rigging
cable damage with plywood or other suitable material.
4.3 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 noise levels
may be disturbing to building occupants.
Position unit to allow adequate space for unobstructed airflow, wiring, and
serviceability.
Do not restrict outdoor airflow. An air restriction at either the outdoor air inlet or
the fan discharge may be detrimental to compressor life.
Do not place the unit where water, ice, or snow from an overhang or roof will
damage or flood the unit. Do not install the unit on carpeting or other combustible
materials. Slab-mounted units should be at least 2 in. (51 mm) above the highest
expected water and runoff levels. Do not use unit if it has been under water.
Maintain a distance of 24 inches between units. Position unit so water, snow, or ice
from roof or overhang cannot fall directly on unit.
See Fig. 7 and Fig. 8 for minimum clearance requirements.
Cold climate considerations (heat pump only)
NOTICE:
Precautions must be taken for units being installed in areas
where snow accumulation and prolonged below-freezing
temperatures occur.

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
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 will permit condensate water to drain when the unit
is in defrost mode. Ensure that drain holes in unit base pan are
unobstructed, preventing drainage of defrost water (See Fig.9).
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.
Ensure that Condensate Drain side is pitched lower than the
opposite side.
Figure 6
0˘h≤ 25mm( 1°)
Condensate drain side
Figure 7
Min. 24"
Access Panel
Avoid Install
Near Bedrooms
Min. 60" Unrestricted
Min. 24"
Access Panel
A minimum clearance of 24" should be maintained adjacent to
all access/service panels. Refer to local code requirements for additional
clearance requirements.
Figure 8
Min. 24"
Min. 12" to
Shrubbery
Access Panel
Supply Air Duct
Figure 9
Min 24"
Snow
barrier
3- 12" Elevation
Snow legs
pad
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
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

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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 or roof away
from the waterfront.
Fencing or shrubbery may provide some shielding protection to the
unit, however minimum unit clearances must still be maintained.
Every three months, wash the outdoor coil and any exposed cabinet
surfaces.

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
4.4 Rooftop Installation - Curb Mounting
The manufacturer does not supply roof curbs, they must be field supplied. On
applications when a roof curb is used,the unit must be positioned on the curb so
the front of the unit is tight against the curb (see Figure 10 Roof Curb Dimension).
The default orientation from the factory is for horizontal airflow. Convert the unit to
downflow using the following procedure:
1. Remove the sheet metal screws securing the supply air cover and the sheet
metal screws securing the return air cover from the base of the unit. Remove
the covers from the base. See Figure 13.
2. Place the covers over the horizontal supply and return openings (painted
side out). Align the screw holes, and secure using the same screws removed
in step 1. See Figure 13.
Install the field-supplied roof mounting curb according to the Installation
Instructions supplied with the curb. Install insulation, cant strips, roofing, and
flashing. Ductwork must be attached to curb.
NOTICE:
The gasketing of the unit to the roof curb is critical for a
water tight seal. Install gasketing material supplied with the
field supplied roof curb. Improperly applied gasketing also
can result in air leaks and poor unit performance.
NOTICE:
The unit must be secured to the curb by installing screws
through the bottom of the curb flange and into the unit
base rails.
Figure 10
A-A A
A
SUPPLY
AIR
RETURN
AIR
1"
1"
E
F
CC
12-1/16" 12-1/16"
D
B
43-9/16"
39-1/2"
NOTES:
1. Roof curb must be set up for unit being installed.
2. Seal strip must be applied, as required, to unit being installed.
4. Attach ductwork to curb (flanges of duct rest on curb).
5. Recommended insulated panels: 1 in. (25.4 mm) thick fiberglass 1 lb. density.
Roof Curb Details
BCDEF
CURB 14-1/4" 15-1/4" 46-1/16" 16" 42-3/16"
Table 5 Roof Curb Details - inches
Figure 11
15-1/4"
1"
42-3/16"
12-1/16" 12-1/16" 16"
Insulation layer
1"
4-1/16"
14-1/4"
1-15/16"
15-1/4"
1-15/16"
46-1/16"
Roof Curb Dimensions
For units applied with a roof curb, the minimum clearance
may be reduced from 1 inch to 1/2 inch between combustible roof curb
material and supply air duct.
NOTICE: UNIT/STRUCTURAL DAMAGE HAZARD
Failure to follow this caution may result in property
damage. Ensure there is sufficient clearance for saw blade
when cutting the outer horizontal flange of the roof curb so
there is no damage to the roof or flashing.

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
5 Airflow Performance
Airflow performance data is based on cooling performance with a coil and no filter
in place. Check the performance table for appropriate unit size selection.
External static pressure should stay within the minimum and maximum limits
shown in the table below in order to ensure proper operation of both cooling,
heating, and electric heating operation.
Model
Number Motor Speed
SCFM
External Static Pressure-Inches W.C.[kPa]
0[0] 0.1[.02] 0.2[.05] 0.3[.07] 0.4[.10] 0.5[.12] 0.6[.15] 0.7[.17] 0.8[.20]
BRBA-60HWD1N1-M18
Tap (1)
SCFM 1385 1300 1230 1136 1045 959 867 787 717
Watts 164 171 180 192 204 217 232 238 249
Amps 1.43 1.48 1.56 1.64 1.74 1.84 1.94 1.99 2.07
Tap (2)
SCFM 1489 1432 1352 1279 1172 1088 1013 934 863
Watts 206 211 223 233 241 257 269 283 295
Amps 1.76 1.80 1.89 1.96 2.02 2.13 2.24 2.34 2.43
Tap (3)
SCFM 1638 1572 1511 1440 1368 1293 1205 1137 1067
Watts 293 319 333 343 348 355 365 373 383
Amps 2.03 2.08 2.15 2.17 2.20 2.27 2.31 2.39 2.42
Tap (4)
SCFM 1964 1903 1840 1786 1724 1655 1591 1488 1427
Watts 435 450 466 479 494 507 521 535 551
Amps 3.51 3.67 3.71 3.86 3.96 4.07 4.17 4.27 4.38
Tap (5)
SCFM 2293 2225 2193 2133 2090 2011 1877 1755 1614
Watts 661 682 708 710 731 730 720 701 667
Amps 5.13 5.29 5.49 5.52 5.67 5.59 5.66 5.45 5.17
Table 6
Bold outlinedareas represent airflowoutside of therequired300-450 cfm
tonrange.
NOTES:
1. The high stage airflow must be used as the rated airflow for the full load
operation of machine.
2. The rated airflow of systems without electric heater kits requires between
300 and 450 cubic feet of air per minute (CFM).
3. The rated airflow of systems with electric heater kits requires between 350
and 450 cubic feet of air per minute (CFM).
4. The air distribution system has the greatest effect on airflow. Therefore, the
contractor should use only industry-recognized procedures.
5. Duct design and construction should be carefully done. System
performance can be lowered dramatically through poor design or
workmanship.
6. Air supplier ducts should be located along the perimeter of the conditioned
space and properly sized. Improper location or insufficient air flow may
cause drafts or noise in the ductwork.
7. Installers should balance the air distribution system to ensure proper quiet
airflow to all rooms in the home. An air velocity meter or airflow hood can be
used to balance and verify branch and system airflow (CFM).

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
6 Indoor Fan Motor Function
System Operation and Function
Two Stage Fan Control
The IDP supports two stage fan control which requires a two stage thermostat
(Y1&Y2). When there is a call for Y2, the blower motor will turn to high speed
setting. When there is a call for Y1, the blower motor will turn to low speed setting.
Unit will run at low speed setting when there is only G call. It will run in high speed
setting when there is W/W1/W2 signal (when the electric heat kit is on).
The X13 ECM motor supports 5 speeds. Customer can select the suitable speed by
adjusting the SW6-1 and SW6-2 dip switches. Refer to Airflow Performance Table
(Table 6) for reference airflow. Refer to Fig. 48 for dip switches settings.
If 2 stage thermostat is not available, single stage thermostat may be used, please
refer to Wiring Diagram section for wiring instructions. If Y1 and Y2 are jumped, the
unit will only run in high stage fan speed.
Anti-Cold Air Fan Delay
The Anti-Cold Air Fan Delay function utilizies a sensor (T2) located on the indoor
coil, which prevents the blower from turning on until the coil has reached a certain
temperature. This feature prevents cold air blow during heating operation.
1. When SW6-3 dip switch is set to the "ON" position and the unit is in heating
mode, the Anti-Cold Air Fan Delay function will activate based on the
following entry conditions (all 3 conditions must be met):
a. Indoor Coil Temperature (T2) < 82.4℉
b. Electric heat kit is turned off
c. There is a call for Y1 from thermostat to indoor unit
2. This function will deactivate if ONE OF the following exit conditions are met
OR the system has been operating in heating mode for 15 minutes.
a. T2 ≥ 89.6℉
b. Heater kit is turned on
c. The system is NOT running Heat mode
3. During the heating mode, if one of the exit conditions of Anti-Cold Air is
satisfied, the blower motor will turn on in first stage fan speed.
4. During the heating mode, if all of the entry conditions of Anti-Cold Air are
met and maintained for 120s, the blower motor will change to first stage
speed.
Heating Fan Delay
If SW6-3 dip switch is set to the "OFF" position and the unit is in heating mode, the
blower will operate with a 90 second delay with the fan speed dictated by Y1 or Y2
signal.
Passive Dehumidification (Optional)
IDP has a Passive Dehumidification function which lowers the fan speed (first
stage) with a DH call from the thermostat. This function requires proper DH wiring
from the indoor unit to the thermostat (with a humidistat).
If DH wire is not connected, the unit will still function normally.
7 Ductwork
Field ductwork must comply with the National Fire Protection Association NFPA
90A, NFPA 90B and any applicable local ordinance(s).
WARNING:FIRE HAZARDAND CARBONMONOXIDE
Do not, under any circumstances, connect return ductwork
to any other heat producing device such as fireplace insert,
stove, etc. Unauthorized use of such devices may result in
fire, carbon monoxide poisoning, explosion, personal injury
or property. damage.
Sheet metal ductwork run in unconditioned spaces must be insulated and covered
with a vapor barrier. Fibrous ductwork may be used if constructed and installed
in accordance with SMACNA Construction Standard on Fibrous Glass Ducts.
Ductwork must comply with National Fire Protection Association as tested by
U/L Standard 181 for Class I Air Ducts. Check local codes for requirements on
ductwork and insulation.
Duct system mustbe designed withinthe range ofexternalstatic pressure
the unitis designed to operateagainst. It isimportant that thesystemairflow
be adequate. Make suresupply and return ductwork, grills,special filters,
accessories, etc.are accounted forin totalresistance. Seeairflow performance
tablesinSection 5 of thismanual.
Design the duct system in accordance with “ACCA” Manual “D” Design for
Residential Winter and Summer Air Conditioning and Equipment Selection.
Latest editions are available from: “ACCA” Air Conditioning Contractors of
America, 1513 16th Street, N.W., Washington, D.C. 20036. If duct system
incorporates flexible air duct, be sure pressure drop information (straight
length plus all turns) shown in “ACCA” Manual “D” is accounted for in system.
If an elbow is included in the plenum close to the unit, it must
not be smaller than the dimensions of the supply duct flange on the unit.
NOTICE:
The front flange on the return duct (if connected to the
blower casing) must not be screwed into the area where
the power wiring is located. Drills or sharp screw points
can damage insulation on wires located inside unit.
Secure all ducts to roof curb and building structure on downflow discharge
units. Do not connect ductwork to unit. For horizontal applications, unit is
provided with flanges on the horizontal openings. All ductwork should be
secured to the flanges using proper fasteners for the type of duct used and
tape the duct-to unit joint as required to prevent air leaks.
NOTICE:
When fastening ductwork to the side duct flanges on the
unit, insert the screws through the duct flanges only.
DO NOT insert the screws through the casing. Outdoor
ductwork must be insulated and waterproofed.

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
Be sure to note supply and return openings. Refer to Fig. 3 for
information concerning supply and return air duct dimensions.
Figure 12
Return Air
Supply Air
Roof Flashing
Angle Iron
Frame
Rooftop Installation — Frame Mounting
Rooftop Installation—Frame Mounting
Figure 13
SHEET METAL
SCREWS HORIZONTAL RETURN
AIR COVER
HORIZONTAL SUPPLY
AIR COVER
Figure 14
Roof Flashing
Return Air Supply Air
Roof Flashing
Angle Iron
Frame
Typical Rooftop Down Airflow Application with Frame
Typical Rooftop Down Airflow Application with Frame

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
8 Condensate Drain Connection
Unit should be installed in accordance with national and local safety codes,
including but not limited to ANSI/NFPS No. 70, local plumbing and wastewater
codes and any other applicable codes.
8.1 Install Drain Pipe
1. Ensure drain lines do not block access to front of the unit. Minimum
clearance of 24 inches is required for filter, coil or blower removal and
service access.
2. Make sure unit is leveled or pitched slightly toward primary drain
connection so that water will drain completely from the pan.
3. Do not reduce drain line size to less than connection size provided on
condensate drain pan.
4. All drain lines must be pitched downward away from the unit at a minimum
of 1/8” per foot of line to ensure proper drainage.
5. Do not connect condensate drain line to a closed or open sewer pipe. Run
condensate to an open drain or run line to a safe outdoor area.
6. The drain line should be insulated where necessary to prevent sweating and
damage due to condensate forming on the outside surface of the line.
7. Make provisions for disconnecting and cleaning of the primary drain line
should it become necessary. Install a 2 inch trap in the primary drain line
as close to the unit as possible. Make sure that the top of the trap is below
connection to the drain pan to allow complete drainage of pan.
Figure 15
1in.(25mm)min
2in.(51mm)min
TRAP
OUTLET
When making drain fitting connections to the drain pan, use a
thin layer of Teflon paste, silicone or Teflon tape and install by hand
tightening.
When making drain fitting connections to drain pan, do not
overtighten. Over tightening fittings can split pipe connections on the
drain pan.
9 Air Filter (Not Factory-Installed)
Filters and filter racks are not included with the unit and must be field supplied.
An external filter or other means of filtration must be properly sized for a maximum
of 300 feet/min. air velocity or what is recommended for the type of filter installed.
Filter application and placement are critical to airflow, which may affect the heating
and cooling system performance. Reduced airflow can shorten the life of the
system’s major components, such as motor, elements, heat relays, evaporator coil
or compressor. Consequently, we recommend that the return air duct system have
only one filter location. For systems without a return air filter grill, multiple filter
grills can be installed at each of the return air openings.
If adding high efficiency filters or electronic air filtration systems, it is very
important that the air flow is not reduced. If air flow is reduced the overall
performance and efficiency of the unit will be reduced. It is strongly recommended
that a professional installation technician is contacted to ensure such filtration
systems are installed correctly.
Do not double filter the return air duct system. Do not filter the
supply air duct system. This will change the performance of the unit and
reduce airflow.
WARNING:FIRE HAZARD
Do not operate the system without filters. A portion of the
dust suspended in the air may temporarily lodge in the
duct runs and at the supply registers. Any circulated dust
particles could be heated and charred by contact with the
air handler elements. This residue could soil ceilings, walls,
drapes, carpets and other articles in the house.
Soot damage may occur with filters in place, when certain
types of candles, oil lamps or standing pilots are burned.
HeatPumpModel No. Size Recommended in.
BRBA-60HWD1N1-M18 1 16"x14"x1"
Table 7

| 17
Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
10 Electrical Wiring
Field wiring must comply with the National Electric Code (NEC) and any applicable
local ordinance.
WARNING: ELECTRICAL SHOCK
Disconnect all power to unit before installing or servicing.
More than one disconnect switch may be required to
de-energize the equipment. Hazardous voltage can cause
severe personal injury or death.
10.1 Power Wiring
1. It is important that proper electrical power is available for connection to the
unit being installed. See the unit nameplate, wiring diagram, and electrical
data in the installation instructions for more detailed requirements. Voltage
tolerance should not be over 10% from rating voltage.
2. If any of the wiring must be replaced, replacement wiring must be the same
type as shown in nameplate, wiring diagram and electrical data sheet.
3. Install a branch circuit disconnect of adequate size to handle starting
current, located within sight, and readily accessible to the unit.
4. Electric Heater: If the optional Electric Heat Kit is installed, unit should
be equipped with 30~60 amp circuit breakers or fuse. These breaker(s)
protect the internal wiring in the event of a short circuit and serve as a
disconnect. Circuit breakers installed within the unit do not provide over-
current protection of the supply wiring and therefore may be sized larger
than the branch circuit protection.
Supply circuit power wiring must be 221 °F minimum copper
conductors only. See Table 8 for ampacity, wire size and circuit
protector requirements. Supply circuit protective devices may be
either fuses or “HACR” type circuit breakers.1-3/8” knockouts
inside the cabinet are provided for connection of power wiring to
electric heater.
Power wiring is connected to the power terminal block in unit
electric cabinet. See Electric Heater Kit Installation Instructions
for details.
5. See wiring diagram located on inside of blower access panel for proper
wiring instructions.
10.2 Grounding
WARNING: ELECTRICAL SHOCK
The unit must be permanently grounded. Failure to do so
can result in electrical shock causing personal injury or
death.
The unit must be electrically grounded in accordance with local codes
or the national electric code.
Grounding may be accomplished by attaching ground wire(s) to ground
lug(s) provided in the unit wiring compartment.
10.3 Control Wiring
Low voltage control wiring should not be run in conduit with high
voltage wiring. Keep distance between the two conduits per local codes.
18 AWG. color-coded low voltage wire should be used for lengths less
than 100ft. For wire lengths longer than 100 ft., 16 AWG. wire should
be used.
7/8"knockout hole should be used to route control wires into the unit.
After installation, ensure separation of low voltage and high voltage
wiring is maintained.
Refer to Figures 16 and 17 for thermostat wiring connections.
Figure 16
High voltage power supply Control wiring
Indoor Control
Board
RY1 Y2CB
GW1 W2 DH NC NC
L1 L2

18 |
Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
Figure 17
Support 3H and 2C thermostat
Support 3H and 1C thermostat
Support 1H and 1C thermostat
Support 4H and 2C thermostat
Support 2H and 2C thermostat
Support 2H and 1C thermostat
THERMOSTAT UNIT CONTROL BOARD
TERMINAL STRIP
R
C
Y1
Y2
G
W1
B
W2
R
C
Y
Y2
G
W/E
O/B
H/DH Dh
GREEN
BLUE
WHITE
GRAY
PURPLE
YELLOW
BROWN
RED R
C
Y1
Y2
G
W1
B
W2
R
C
Y
Y2
G
W/E
O/B
H/DH Dh
W2
GREEN
BLUE
WHITE
WHITE/BLACK
GRAY
PURPLE
YELLOW
BROWN
RED
R
C
Y1
Y2
G
W1
B
W2
R
C
Y
G
W/E
O/B
H/DH Dh
W2
GREEN
BLUE
WHITE
WHITE/BLACK
GRAY
YELLOW
BROWN
RED R
C
Y1
Y2
G
W1
B
W2
R
C
Y
Y2
G
O/B
H/DH Dh
GREEN
BLUE
GRAY
PURPLE
YELLOW
BROWN
RED
R
C
Y1
Y2
G
W1
B
W2
R
C
Y
G
O/B
H/DH Dh
GREEN
BLUE
GRAY
YELLOW
BROWN
RED R
C
Y1
Y2
G
W1
B
W2
R
C
Y
G
O/B
H/DH Dh
W/E
GREEN
BLUE
WHITE
GRAY
YELLOW
BROWN
RED
(2-COOL here represents 2 stages of fan cooling only,
the compressor modulates separately from the fan.)
(2-COOL here represents 2 stages of fan cooling only,
the compressor modulates separately from the fan.)
THERMOSTAT UNIT CONTROL BOARD
TERMINAL STRIP
(Y1/Y2 jumped for fan control, not
related to compressor operation.)
(2-COOL here represents 2 stages of fan cooling only,
the compressor modulates separately from the fan.)
THERMOSTAT UNIT CONTROL BOARD
TERMINAL STRIP THERMOSTAT UNIT CONTROL BOARD TERMINAL STRIP
THERMOSTAT UNIT CONTROL BOARD
TERMINAL STRIP THERMOSTAT UNIT CONTROL BOARD TERMINAL STRIP
(Y1/Y2 jumped for fan control, not
related to compressor operation.)
(Y1/Y2 jumped for fan control, not
related to compressor operation.)
Thermostat Wiring Diagrams
Dh wiring is optional and requires a thermostat with a
humidistat. Dh functions as Passive Dehumidification and will downstage
the indoor fan to first stage. System will operate according to normal
sequence of operations if Dh wiring is absent.
Dashed lines in the above 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 wire must be used with heat pump system only, the reversing
valve energizes in heating.

| 19
Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
WARNING: ELECTRICAL SHOCK
Label all wiring prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
Size
(Tons)
Voltage
- Phase -
Frequency
Compressors
(each)
OD Fan
Motors
(each)
Supply
Blower
Motor
Unit Circuit
RLA LRA FLA FLA MCA¹
(Amps)
Max Fuse²/
Breaker³ Size
(Amps)
60
(5.0)
208/230-
1-60 27A 52A 2.1A 6.0A 41.9 60
Table 8 Electrical Data Without Electric Heat
HeaterCircuit
Model kW Stages Amps MCA¹
(Amps)
Max Fuse²/
Breaker³
Size (Amps)*
EHK-05J 3.8/5 1 18.1/20.8 23/26 25/30
EHK-08J 5.6/7.5 1 27.1/31.3 34/40 35/40
EHK-10J 7.5/1.0 1 36.1/41.7 46/53 50/60
EHK-15J 11.3/15 2 54.2/62.5 68/79 70/80
EHK-20J 15/20 2 72.2/83.3 91/105 100/110
Table 9 Electrical Data With Electric Heat
1. Minimum Circuit Ampacity.
2. Maximum Over Current Protection per Standard UL 1995.
3. Fuse or HACR circuit breaker size installed at factory or field installed.
* Max Fuse/Breaker Sizes listed in Table 9 are for electric heater ONLY. DOES NOT
include breaker size for the unit (refer to Table 8).
WARNING: ELECTRICAL SHOCK / FIRE HAZARD
Any power supply and circuits must be wired and
protected in accordance with local electrical codes.
11 Start Up
11.1 System Start Up
1. Ensure Sections 4, 5, 6, 7, and 8 have been completed.
2. Set System Thermostat to OFF.
Figure 18
3. Turn on disconnect to apply power to the indoor and outdoor units.
Figure 19
ON
OFF
4. Wait one (1) hour before starting the unit if compressor crankcase heater is
used and the outdoor ambient temperature is below 70 °F.
Figure 20
60 MIN.
5. Set system thermostat to ON.
Figure 21

20 |
Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703104 A (11.2022)
12 System Charge Adjustment
The unit comes precharged from the factory with 12-9 lb-oz of
refrigerant. Please measure superheat and subcooling, and add or
remove refrigerant accordingly.
12.1 Charging: Weigh-In Method
Weigh-in method is recommended for 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.
HeatPumpModel Refrigerant Charge (lb-oz)
BRBA-60HWD1N1-M18 12-9
Table 10
12.2 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 55°F outdoor ambient temperatures. For outdoor ambient
temperatures below 55°F , 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 55°F.
Figure 22
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 70°F to 80°F.
Figure 23
80 ºF
70ºF
Indoor Temp
2. Stabilize the system.
3. After starting the system in cooling mode, short press “FORCE” button,
and a “ |— ” symbol should appear. System may take 10 minutes to ramp up.
Operate the system for a minimum of twenty (20) minutes.
Figure 24
SW2
FORCE
After a twenty (20) minute stabilization period operating at
100% capacity (60 Hertz ), 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.
Figure 25
20 MIN.
4. Calculate subcooling value on liquid line (According to Table 11)
Measured Liquid Line Temp. = ________ºF
Measured Liquid Line Pressure = _______ PSIG
Calculate subcooling value = ________ºF