Bosch TA025 Manual

Installation and Maintenance Manual TA Series
6 720 220 046
Revised 03-11

©Copyright 2011 Bosch, Inc All rights reserved

6 720 220 046
Revised 03-11 Subject to change without prior notice
3
TA Series
TABLE OF CONTENTS
Model Nomenclature.................................................................................... 3
Initial Inspection .......................................................................................... 4
General Description..................................................................................... 4
Moving and Storage ..................................................................................... 4
Safety Considerations.................................................................................. 4
Location....................................................................................................... 4
Installation................................................................................................... 4
Condensate Drain ........................................................................................ 5
Duct System................................................................................................. 6
Piping .......................................................................................................... 6
Electrical...................................................................................................... 6
Thermostat Connections ............................................................................. 7
Safety Devices & the UPM Controller ........................................................... 9
Electric Heater Package Option ................................................................. 10
Sequence of Operation Two-Stage Units.................................................... 11
Well Water Systems.................................................................................... 11
Installation of Pressure Regulating Valves.................................................. 12
Cooling Tower / Boiler Application............................................................. 12
Earth Coupled Systems.............................................................................. 12
System Checkout ....................................................................................... 13
Unit Start-Up.............................................................................................. 13
Heat Recovery Package ............................................................................. 13
Maintenance .............................................................................................. 15
Well Water Application............................................................................... 16
Cooling Tower/Boiler Application .............................................................. 17
Earth Coupled Application ......................................................................... 18
Wiring Diagrams......................................................................................... 19
Single Phase ECM Blower...................................................................... 19
Single Phase ECM Blower—Electric Heat................................................ 20
Operating Pressures & Temperatures ........................................................ 21
Unit Check-Out........................................................................................... 25
Trouble Shooting........................................................................................ 26
Table of Contents
MODEL NOMENCLATURE
SUPPLY AIR LOCATION:
T - TOP (VT ONLY)
E - END BLOW (HZ ONLY)
B - BOTTOM (CF ONLY)
RETURN AIR LOCATION:
S - STRAIGHT THRU
(HZ ONLY)
L - LEFT
R - RIGHT
WATER CONNECTION
LOCATION:
F-FRONT
SERIES:
TA
NOMINAL CAPACITY:
VOLTAGE DESIGNATIONS:
1 - 208/1/60 & 230/1/60
CABINET CONFIGURATION:
VT - VERTICAL
HZ - HORIZONTAL
CF - COUNTERFLOW
HEAT EXCHANGER MATERIAL:
C - COPPER
N - CUPRO-NICKEL
TA 049 - 1 VT C - F L T

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6 720 220 046
4 TA Series
INITIAL INSPECTION
Be certain to inspect all cartons or crates on each unit
as received at the job site before signing the freight
bill. Verify that all items have been received and that
there are no visible damages; note any shortages or
damages on all copies of the freight bill. In the event
of damage or shortage, remember that the purchaser
is responsible for ling the necessary claims with the
carrier. Concealed damages not discovered until after
removing the units from the packaging must be
reported to the carrier within 24 hours of receipt.
GENERAL DESCRIPTION
These Water-to-Air Heat Pumps provide the best
combination of performance and efciency
available. Safety devices are built into each unit to
provide the maximum system protection possible
when properly installed and maintained.
The TA Water-to-Air Heat Pumps are Underwriters
Laboratories (UL) and (cUL) listed for safety. The
water-to-Air Heat Pumps are designed to operate
with entering uid temperature between 20°F to
80°F in the heating mode and between 50°F to
110°F in the cooling mode.
50°F Min. EWT for well water applications with
sufcient water ow to prevent freezing.
Antifreeze solution is required for all closed
loop applications. Cooling Tower/Boiler and
Earth Coupled (Geo Thermal) applications
should have sufcient antifreeze solution to
protect against extreme conditions and
equipment failure. Frozen water coils are not
covered under warranty.
This product should not be used for
temporarily heating/cooling during
construction. Doing so may effect the units
warranty.
MOVING AND STORAGE
If the equipment is not needed for immediate
installation upon its arrival at the job site, it should
be left in its shipping carton and stored in a clean,
dry area. Units must only be stored or moved in the
normal upright position as indicated by the “UP”
arrows on each carton at all times. If unit stacking is
required, stack units as follows: Vertical units less
than 6 tons, no more than two high. Horizontal units
less than 6 tons, no more than three high. “Do not
stack units larger than 6 tons.”
SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be
hazardous due to system pressure and electrical
components. Only trained and qualied personnel
should install, repair, or service the equipment.
Untrained personnel can perform basic functions of
maintenance such as cleaning coils and replacing
lters.
Caution
Before performing service or maintenance
operations on the system, turn off main power
to the unit. Electrical shock could cause
personal injury or death.
When working on equipment, always observe
precautions described in the literature, tags, and
labels attached to the unit. Follow all safety codes.
Wear safety glasses and work gloves. Use a
quenching cloth for brazing, and place a re
extinguisher close to the work area.
LOCATION
Locate the unit in an indoor area that allows easy
removal of the lter and access panels, and has
enough room for service personnel to perform
maintenance or repair. Provide sufcient room to
make uid, electrical, and duct connection(s). If the
unit is located in a conned space such as a closet,
provisions must be made for return air to freely enter
the space. On horizontal units, allow adequate room
below the unit for a condensate drain trap and do
not locate the unit above supply piping. These units
are not approved for outdoor installation; therefore,
they must be installed inside the structure being
conditioned. Do not locate in areas that are subject
to freezing.
INSTALLATION
Caution
Remove all shipping blocks under blower
housing. Loosen compressor mounting bolts.
MOUNTING VERTICAL UNITS
Vertical units up to six tons are available in left or
right air return congurations. Vertical units should
be mounted level on a vibration absorbing pad
Initial Inspection

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5
TA Series
pan is usually placed on a plywood base isolated
from the ceiling joists by additional layers of
vibration absorbing mesh. In both cases, a 3/4”
drain connected to this secondary pan should be
run to an eave at a location that will be noticeable.
If the unit is located in a crawl space, the bottom of
the unit must be at least 4” above grade to prevent
ooding of the electrical parts due to heavy rains.
CONDENSATE DRAIN
A drain line must be connected to the heat pump
and pitched away from the unit a minimum of 1/8”
per foot to allow the condensate to ow away from
the unit.
This connection must be in conformance with local
plumbing codes. A trap must be installed in the
condensate line to insure free condensate ow.
(Heat Pumps are not internally trapped). A vertical
air vent is sometimes required to avoid air pockets.
(See Figure #3). The length of the trap depends on
the amount of positive or negative pressure on the
drain pan. A second trap must not be included.
The horizontal unit should be pitched
approximately 1/4” towards the drain in both
directions, to facilitate condensate removal. (See
Figure #4)
Figure #4
slightly larger than the base to minimize vibration
transmission to the building structure. It is not
necessary to anchor the unit to the oor.
(See Figure #1).
MOUNTING HORIZONTAL UNITS
While horizontal units may be installed on any level
surface strong enough to hold their weight, they are
typically suspended above a ceiling by threaded rods.
The rods are usually attached to the unit corners by
hanger bracket kits. (See Figure #2). The rods must be
securely anchored to the ceiling. Refer to the hanging
bracket assembly and installation instructions for
details. Horizontal units installed above the ceiling
must conform to all local codes. An auxiliary drain pan
if required by code, should be at least four inches
larger than the bottom of the heat pump. Plumbing
connected to the heat pump must not come in direct
contact with joists, trusses, walls, etc.
Some applications require an attic oor installation
of the horizontal unit. In this case the unit should
be set in a full size secondary drain pan on top of a
vibration absorbing mesh. The secondary drain pan
prevents possible condensate overow or water
leakage damage to the ceiling. The secondary drain
VIBRATION
PAD
FULL SIZE
Figure #1
Figure #2
Figure #3
Mounting Horizontal Units

Subject to change without prior notice Revised 03-11
6 720 220 046
6 TA Series
DUCT SYSTEM
A supply air outlet collar and return air duct ange
are provided on all units to facilitate duct
connections. Refer to the Bosch individual data
specication sheet for physical dimensions of the
collar and ange.
A exible connector is recommended for supply and
return air duct connections on metal duct systems. All
metal ducting should be insulated with a minimum of
one inch duct insulation to avoid heat loss or gain and
prevent condensate forming during the cooling
operation. Application of the unit to uninsulated duct
work is not recommended as the unit’s performance
will be adversely affected. Do not connect discharge
ducts directly to the blower outlet. The factory
provided air lter must be removed when using a lter
back return air grill. The factory lter should be left in
place on a free return system.
If the unit will be installed in a new installation
which includes new duct work, the installation
should be designed using current ASHRAE
procedures for duct sizing. If the unit is to be
connected to existing ductwork, a check should be
made to assure that the duct system has the
capacity to handle the air required for the unit
application. If the duct system is too small, larger
ductwork should be installed. Check for existing
leaks and repair.
The duct system and all diffusers should be sized to
handle the designed air ow quietly. To maximize
sound attenuation of the unit blower, the supply
and return air plenums should be insulated. There
should be no direct straight air path thru the return
air grille into the heat pump. The return air inlet to
the heat pump must have at least one 90 degree
turn away from the space return air grille. If air
noise or excessive air ow are a problem, the
blower speed can be changed to a lower speed to
reduce air ow. (Refer to ECM motor interface
board section in this manual and Figure #7)
PIPING
Supply and return piping must be as large as the
unit connections on the heat pump (larger on long
runs). Never use exible hoses of a smaller inside
diameter than that of the uid connections on the
unit.
TA units are supplied with either a copper or
optional cupro-nickel condenser. Copper is
adequate for ground water that is not high in
mineral content. Should your well driller express
concern regarding the quality of the well water
available or should any known hazards exist in your
area, we recommend proper testing to assure the
well water quality is suitable for use with water
source equipment. In conditions anticipating
moderate scale formation or in brackish water a
cupro-nickel heat exchanger is recommended.
Both the supply and discharge water lines will
sweat if subjected to low water temperature. These
lines should be insulated to prevent damage from
condensation.
All manual ow valves used in the system must be
ball valves. Globe and gate valves must not be used
due to high pressure drop and poor throttling
characteristics. Never exceed the recommended
water ow rates as serious damage or erosion of
the water to refrigerant heat exchanger could
occur.
Always check carefully for water leaks and repair
appropriately. Units are equipped with female pipe
thread ttings. Consult the specication sheets for
sizes. Teon tape sealer should be used when
connecting water piping connections to the units to
insure against leaks and possible heat exchanger
fouling. Do not overtighten the connections.
Flexible hoses should be used between the unit and
the rigid system to avoid possible vibration. Ball
valves should be installed in the supply and return
lines for unit isolation and unit water ow
balancing.
ELECTRICAL
(Refer to electrical component box layout, Figure #5)
Field wiring must comply with local and national
electric codes. Power to the unit must be within the
operating voltage range indicated on the unit
nameplate or on the performance data sheet. On
three phase units (single stage units only) phases
must be balanced within 2%.
Caution
Operation of unit on improper line voltage or with
excessive phase imbalance will be hazardous to the
unit, constitutes abuse and may void the warranty.
Duct System

6 720 220 046
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7
TA Series
Properly sized fuses or HACR circuit breakers must
be installed for branch circuit protection. See unit
nameplate for maximum fuse or breaker size.
The unit is provided with a concentric knock-out in
the front left corner post for attaching common
trade sizes of conduit, route power supply wiring
through this opening. Always connect the ground
lead to the grounding lug provided in the control box
and power leads to the power supply terminal block
as indicated on the wiring diagram and Figure #5.
Units supplied with internal electric heat
require two (2) separate power supplies: one
for the unit compressor and one for the electric
heater elements, blower motor and control
circuit. Refer to the ELECTRIC HEATER
PACKAGE OPTION section and Figure #8 for
wiring instructions, minimum circuit ampacities
and maximum fuse/breaker sizing.
Figure #5 - Electrical Box Component Layout
SINGLE & TWO STEP
Figure #6 ECM Interface Board
ECM INTERFACE BOARD
THERMOSTAT CONNECTIONS
Thermostat wiringisconnected to the 10 pinscrew type
terminalblock on the lowercenter portionof theECM
InterfaceBoard.Inadditionto providing a connecting
point for thermostat wiring, theinterfaceboard also
translatesthermostatinputsinto control commands for
the variable speed programmableECM DC fanmotor and
displays anLEDindicationof operatingstatus. The
thermostatconnections andtheir functions are as
follows:
Y2 Second Stage Compressor Operation
Y1 First Stage Compressor Operation
G Fan
O Reversing Valve (energized in cooling)
W1 Auxiliary Electric Heat (runs in
conjunction with compressor)
EM/W2 Emergency Heat (electric heat only)
NC Transformer 24 VAC Common (extra
connection)
C1 Transformer 24 VAC Common (primary
connection)
R Transformer 24 VAC Hot
HUM Dehumidication Mode
If the unit is being connected to a thermostat with a
malfunction light, this connection is made at the
unit malfunction output or relay.
ECM Interface Board

Subject to change without prior notice Revised 03-11
6 720 220 046
8 TA Series
If the thermostat is provided with a malfunction
light powered off of the common (C) side of the
transformer, the unit must be provided with a
malfunction relay (Bosch option # 660-006) to
properly energize the light. The relay coil will
be wired across the (ALR) and (C) contacts on
the unit’s UPM board and the relay’s normally
open contacts across (ALR) and the
malfunction light connection on the
thermostat. If the thermostat is provided with a
malfunction light powered off of the hot (R)
side of the transformer, then the thermostat
malfunction light connection should be
connected directly to the (ALR) contact on the
unit’s UPM board.
To the left of the thermostat connection block are a
row of 2 red and 4 green LED’s. These LED’s indicate
the operating status of the unit. They are labeled as
follows:
EM (red) Emergency Heat On
W1 (red) Auxiliary Heat On
O (green) Reversing Valve Energized, unit is in
cooling mode
Y2 (green) Second Stage Compressor On
Y1 (green) First Stage Compressor On
G (green) Fan On
Just above the connector block is a single red LED
labeled CFM that will blink intermittently when the
unit is running and may icker when the unit is off.
This LED indicates the air delivery of the blower at
any given time. Each blink of the LED represent 100
CFM of air delivery so if the LED blinks 12 times,
pauses, blinks 12 times, etc. the blower is delivering
1200 CFM. Refer to Figure #7 for factory
programmed air delivery settings for the TA Series.
To the right of the thermostat connection block is a
green LED labeled dehumidify.
Just above and to the right of the thermostat
connection block are four sets of jumper pins labeled
ADJ, DELAY, HEAT and COOL. The ADJ set of pins are
labeled NORM, (+), (-) and TEST. TA units will all be set
on the NORM position from the factory, however,
airow can be increased (+) or decreased (-) by 15%
from the pre-programmed setting by relocating the
jumper in this section. The TEST position is used to
verify proper motor operation. If a motor problem is
suspected, move the ADJ jumper to the TEST position
and energize G on the thermostat connection block. If
the motor ramps up to 100% power, then the motor
itself is functioning normally. Always remember to
replace the jumper to NORM, (+) or (-) after testing and
reset the unit thermostat to restore normal operation.
Caution
Do not set the ADJ jumper to the (-) setting
when electric heaters are installed. Doing so
may cause the heaters to cycle on their
thermal overload switches, potentially
shortening the life of the switches.
The other three sets of jumper pins are used to
select the proper program in the ECM motor for the
unit. Refer to Figure #7 for the proper jumper
placement.
Caution
Always disconnect power before changing
jumper positions on the interface board and
reset the unit afterward.
To the left of the red and green status LED’s is a row
of 1/4” male quick connects. These are used to pass
thermostat inputs on to the rest of the control
circuit. Remember to always turn off unit power at
the circuit breaker before attaching or disconnecting
 MotorProleAirFlowTable
Figure7:MotorProleAirFlowTableCFM
TwoStageUnits
Model Fan
Only
Y1
COOL/
HEAT
Y2
COOL/
HEAT
AUX
HEAT
EMERG
HEAT
PLUS
ADJ
MINUS
ADJ
TAP COOL/
HEAT/DELAY
TA025 600 750 950 950 950 1090 800 A
TA035 900 1000 1200 1200 1200 1400 1000 A
TA049 1200 1300 1700 1700 1700 1950 1450 B
TA061 1300 1500 2000 2000 2000 2100 1900 A
TA071 1300 1500 2100 2100 2100 2300 1900 A

6 720 220 046
Revised 03-11 Subject to change without prior notice
9
TA Series
any wiring from these connections to avoid
accidental short circuits that can damage unit
control components.
SAFETY DEVICES AND THE
UPM CONTROLLER
Each unit is factory provided with a Unit Protection
Module (UPM) that controls the compressor
operation and monitors the safety controls that
protect the unit.
Safety controls include the following:
• High pressure switch located in the refrigerant
discharge line and wired across the HPC terminals
on the UPM
• Low pressure switch located in the unit refrigerant
suction line and wired across terminals LPC1 and
LPC2 on the UPM.
• Optional freeze protection sensor located on the
leaving side of the water coil prevents unit
operation below 35°F or 15°F (depending on dip
switch setting). The freeze dip switch must be set
to “ON”.
The factory default for the Freeze setting is in
“ON” position. If the freeze stat option is not
ordered, the switch must be repositioned to the
“OFF” position.
• Condensate overow protection sensor located in
the drain pan of the unit and connected to the
‘COND’ terminal on the UPM board.
The UPM includes the following features:
•ANTI-SHORT CYCLE TIME—5 minute delay on
break timer to prevent compressor short cycling.
•RANDOM START—Each controller has a unique
random start delay ranging from 270 to 300 seconds to
reduce the chances of multiple units simultaneously
starting after initial power up or after a power
interruption, creating a large electrical spike.
•LOW PRESSURE BYPASS TIMER—If the compressor is
running and the low pressure switch opens, then the
control will keep the compressor on for 120 seconds.
After 2 minutes if the low pressure switch remains
open, the control will shut down the compressor and
enter a soft lockout. The compressor will not be
energized until the low pressure switch closes and the
anti-short cycle time delay expires. If the low pressure
switch opens 2–4 times in 1 hour, the unit will enter a
hard lock out and need to be reset.
• BROWNOUT/SURGE/POWER INTERRUPTION
PROTECTION—The brownout protection in the UPM
board will shut down the compressor if the
incoming power falls below 18 VAC. The compressor
will remain off till the voltage goes above 18 VAC and
the anti short cycle timer (300 seconds) times out.
The unit will not go into a hard lockout.
• MALFUNCTION OUTPUT—The controller has a set of
wet contacts for remote fault indication or dry contacts
for communication with a DDC controller or BMS. The
fault output will depend on the dip switch setting for
“ALARM”. If it set to “CONST’, a constant signal will be
produced to indicate a fault has occurred and the unit
requires inspection to determine the type of fault. If it is
set to “PULSE”, a pulse signal is produced and a fault
code is detected by a remote device indicating the fault.
See L.E.D. Fault Indication below for blink code
explanations.Theremotedevicemusthaveamalfunction
detectioncapabilitywhentheUPMboardissetto“PULSE”.
• TEST DIP SWITCH—A test dip switch is provided to
reduce all time delay settings to 5 seconds during
troubleshooting or verication of unit operation.
Note that operation of the unit while in test mode
can lead to accelerated wear and premature failure
of the unit. The “TEST” switch must be set back to
“NO” for normal operation.
• FREEZE SENSOR—This is optional and can be set
to ignore or monitor a freeze sensor. There are 2
congurable freeze points, 35°F & 15°F. The unit
will enter a soft lock out until the temperature
climbs above the set point and the anti-short cycle
time delay has expired. The freeze sensor may not
provide protection in the case of loss of ow in the
heating mode. A ow switch or pressure
differential switch is recommended to prevent unit
operation in case of loss of ow.
Caution
If unit is employing a fresh water system (no
anti-freeze protection), it is extremely important to
have the “Freeze” switch set to 35°F in order to
shut down the unit at the appropriate leaving
water temperature and protect your heat pump
from freezing if a freeze sensor is included.
Safety Devices and the UPM Controller

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6 720 220 046
10 TA Series
• L.E.D. FAULT INDICATION—Two L.E.D. indicators
are provided:
• Green: Power L.E.D. indicates 18—30 VAC
present at the board.
• Red: Fault indicator with blink codes as follows:
- One blink—High pressure lockout
- Twoblinks—Low pressure lockout
- Three blinks—Freeze sensor lockout
- Four blinks—Condensate overow
- Five blinks—Brownout
• INTELLIGENT RESET—If a fault condition is initiated,
the 5 minute delay on break time period is initiated
and the unit will restart after these delays expire.
During this period the fault LED will indicate the
cause of the fault. If the fault condition still exists or
occurs 2 or 4 times (depending on 2 or 4 setting for
Lockout dip switch) before 60 minutes, the unit will
go into a hard lockout and requires a manual lockout
reset. A single condensate overow fault will cause
the unit to go into a hard lockout immediately, and
will require a manual lockout reset.
• LOCKOUT RESET—A hard lockout can be reset by
turning the unit thermostat off and then back on
when the “RESET” dip switch is set to “Y” or by
shutting off unit power at the circuit breaker when
the “RESET” dip switch is set to “R”.
The blower motor will remain active during a
lockout condition.
• UPM BOARD DEFAULT SETTINGS—Your UPM
board will come from the factory with the
following default settings:
• Freeze—“ON”
• Temp—35°F
• Lockout—2
• Reset—“Y”
• Alarm—“CONT”
• Test—“NO”
• Hot/Dry Alarm—“HOT”
Elecric Heater Package Option
Considerations
1. Always check incoming line voltage power supply
and secondary control voltage for adequacy.
Transformer primaries are dual tapped for 208
and 230 volts. Connect the appropriate tap to
ensure a minimum of 18 volts secondary control
voltage. 24 volts is ideal for best operation.
2. Long length thermostat and control wiring leads
may create voltage drop. Increase wire gauge or
up-size transformers may be required to insure
minimum secondary voltage supply.
3. Bosch recommends the following guidelines for
wiring between a thermostat and the unit: 18 GA up
to 60 foot, 16 GA up to 100 ft and 14 GA up to 140 ft.
4. Do not apply additional controlled devices to the
control circuit power supply without consulting the
factory. Doing so may void equipment warranties.
5. Check with all code authorities on requirements
involving condensate disposal/over ow
protection criteria.
ELECTRIC HEATER PACKAGE OPTION
Factory installed internal electric heater packages are
available for all series units. Two power supplies are
required when heater packages are utilized. The power
supply for the heater package (located in the electric
heater package control box) provides power for the
heater elements, the blower motor and the control
circuit for the unit. The power supply for the unit pro-
vides power for the compressor. This allows the electric
heaters to continue to operate along with the blower
motor in the case of unit compressor and/or compres-
sor power supply failure. Each TA Series model has a
number of heater sizes available. Refer to Figure #8 for
heater package compatibility with specic CE Series
units, models nomenclature and electrical data.
Caution
Units supplied with internal electric heat require
two (2) separate power supplies: one for the unit
compressor and one for the electric heater
elements, blower motor and control circuit. Refer to
Figure #8 for wiring instructions, minimum circuit
ampacities and maximum fuse/breaker sizing.
Caution
The Electric Heater Kit for Horizontal models
have to be installed before the unit is installed.

6 720 220 046
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11
TA Series
SEQUENCE OF OPERATION–
TWO STAGE UNITS
(Figure #13 Wire Schematic)
COOLING MODE
Energizing the “O” terminal energizes the unit
reversing valve in the cooling mode. The fan motor
starts when the “G” terminal is energized. Note that
the fan motor will take 30 seconds to ramp up to
operating speed and will run at fan only rated air
ow as long as there is no call for compressor or
heater operation.
When the thermostat calls for rst stage cooling (Y1)
the loop pump or solenoid valve if present is
energized and the rst stage of compressor capacity
starts. The fan ramps up to rst stage cooling air ow
in 30 seconds.
When the thermostat calls for second stage cooling
(Y2) the second stage (or full compressor capacity)
is initiated. The fan ramps up to full cooling air ow.
Once the thermostat is satised, the compressor
shuts down accordingly and the fan ramps down to
either fan only mode or off over a span of 30 seconds.
Caution
Note that a fault condition initiating a lockout
will de-energize the compressor irrespective
of which stage is engaged.
HEATING MODE
The rst two stages of heating (Y1 & Y2) operate in
the same manner as cooling, but with the reversing
valve de-energized. On a call for auxiliary heat (W1),
the fan ramps up to auxiliary heat air ow
immediately and the electric heater package is
energized along with the compressor. As the
thermostat is satised, the heaters will shut off as
soon as W1 is de-energized, and the compressors
will remain on until the thermostat stages are
satised. Note that if the unit compressor lock out
for any reason at this time, the electric heaters will
continue to function normally.
Once the thermostat is satised, the compressor
shuts down and the fan ramps down either fan only
mode or off over a span of 30 seconds. If emergency
heat (W2/EM) is called for, the fan will ramp up to
emergency heat air ow immediately and the heater
package will energize in emergency heat mode, all
heater elements coming on. On shut down the fan
will ramp down over a period of 30 seconds.
WELL WATER SYSTEMS
(Figure #10)
Copper is adequate forground waterthatis not high in
mineralcontent.Should yourwelldriller expressconcern
regardingthe qualityofthe wellwater available orshould
Well Water Systems
Figure 8: Heater Package Compatibility
Model Heater Model KW Heater Amps Circuit MCA Max. Fuse AWG
Min.
208V 240V 208V 240V 208V 240V
TA025 thru 035 HP050-1XS 4.8 17.3 20.0 L1/L2 27.1 30.4 30 30 8
TA049 thru 071 HP050-1XM 4.8 17.3 20.0 L1/L2 27.1 30.4 30 30 8
TA025 thru 035 HP075-1XS 7.2 23.6 30.0 L1/L2 34.9 42.9 40 45 8
TA049 thru 071 HP075-1XM 7.2 23.6 30.0 L1/L2 35.7 43.8 40 45 8
TA025 thru 035 HP100-1XS 9.6 34.7 40.0 L1/L2 48.8 55.4 50 60 6
TA049 thru 071 HP100-1XM 9.6 34.7 40.0 L1/L2 49.5 56.3 50 60 6
TA049 thru 071 HP150-1XM
HP150-1XM
14.4
14.4
52.0
34.7
17.3
60.0
40.0
20.0
SINGLE
L1/L2
L3/L4
71.2
49.5
21.7
81.3
56.3
25.0
80
60
25
90
60
25
4
6
10
TA049 thru 071 HP200-1XM
HP200-1XM
19.2
19.2
69.3
34.7
34.7
80.0
40.0
40.0
SINGLE
L1/L2
L3/L4
92.9
49.5
43.4
106.3
56.3
50.0
100
50
45
110
60
50
2
6
6
All heaters rated single phase 60 Hz, and include unit fan load. All fuses type “D” time delay or HACR type breaker or
HRC FORM 1. Wire size based on 60 deg. C copper conductors.

Subject to change without prior notice Revised 03-11
6 720 220 046
12 TA Series
cooling to the loop water thus maintaining a constant
supply temperature to the unit. When utilizing open
cooling towers, chemical water treatment is mandatory
to ensure the water is free from corrosive elements. A
secondary heat exchanger (plate frame) between the
unit and the open cooling tower may also be used. It is
imperative that all air be eliminated from the closed loop
side of the heat exchanger to insure against fouling.
In the heating mode, heat is absorbed from the
water loop. A boiler can be utilized to maintain the
loop at the desired temperature.
Caution
Water piping exposed to extreme low ambient
temperatures is subject to freezing.
Consult the specication sheets for piping sizes. Teon
tape sealer should be used when connecting to the unit
to insure against leaks and possible heat exchanger
fouling. Do not overtighten the connections. Flexible
hoses should be used between the unit and the rigid
system to avoid possible vibration. Ball valves should be
installed in the supply and return lines for unit isolation
and unit water ow balancing. Pressure/temperature
ports are recommended in both supply and return lines
for system ow balancing. Water ow can be accurately
set by measuring the water-to-refrigerant heat
exchangers water side pressure drop. See specication
sheets for water ow vs. pressure drop information.
No unit should be connected to the supply or return
piping until the water system has been completely
cleaned and ushed to remove any dirt, piping chips or
other foreign material. Supply and return hoses should
be connected together during this process to ensure the
entire system is properly ushed. After the cleaning and
ushing has taken place the unit may be connected to
the water loop and should have all valves wide open.
EARTH COUPLED SYSTEMS
(Figure #12)
Closed loop and pond applications require specialized
design knowledge. No attempt at these installations
should be made unless the dealer has received
specialized training. Utilizing the Ground Loop
Pumping Package (GLP), makes the installation easy.
Anti-freeze solutions are utilized when low evaporating
conditions are expected to occur. Refer to the GLP
installation manuals for more specic instructions.
Earth Coupled Systems
any knownhazards exist in your area,we recommend
propertesting to assure the wellwater quality issuitable
forusewith water source equipment. In conditions
anticipating moderate scaleformation or in brackish water
acupro-nickel heat exchangeris recommended.In well
water applications waterpressure must always be
maintained in the heat exchanger.This can be
accomplishedwith eithercontrol valve or a bladdertype
expansiontank. Whenusinga singlewater well tosupply
both domestic waterandtheheat pump care mustbe
taken to insure that the well can provide sufcient ow for
both.Inwell waterapplications a slow closingsolenoid
valve must beused to preventwater hammer.
Solenoid valves should be connected across Y1 and
C1 on the interface board for all. Make sure that the
VA draw of the valve does not exceed the contact
rating of the thermostat.
INSTALLATION OF PRESSURE
REGULATING VALVES
Pressure regulatingvalves are used to increase ordecrease
water ow through the heat pump in response to
refrigerant pressure. In some cases more water may be
requiredinheatingthanincooling,orviceversa.Withthe
Bosch heat pumpsthese valvesare not required.However,
if installed,a pairof valves are requiredfor proper
operation,one valve forcooling(direct acting) and another
valve forheating (indirectacting). A refrigeranttapis
provided in the refrigerant line located betweenthe
reversing valve and thewater-to-refrigerant heat exchanger
forproper monitoring of the refrigerant pressures.
The discharge water from the heat pump is not
contaminated in any manner and can be disposed of
in various ways depending on local building codes
(i.e. discharge well, dry well, storm sewer, drain
eld, stream or pond, etc.) Most local codes forbid
the use of a sanitary sewer for disposal. Consult your
local building and zoning department to insure
compliance in your area.
COOLING TOWER/BOILER SYSTEMS
(Figure #11)
The cooling tower and boiler water loop temperature
is usually maintained between 50˚ F to 100 ˚ F to
assure adequate cooling and heating performance.
In the cooling mode, heat is rejected from the unit into
the water loop. A cooling tower provides evaporative

6 720 220 046
Revised 03-11 Subject to change without prior notice
13
TA Series
SYSTEM CHECKOUT
• After completing the installation, and before
energizing the unit, the following system checks
should be made:
• Verify that the supply voltage to the heat pump is
in accordance with the nameplate ratings.
• Make sure that all electrical connections are tight
and secure.
• Check the electrical fusing and wiring for the
correct size.
• Verify that the low voltage wiring between the
thermostat and the unit is correct.
• Verify that the water piping is complete and correct.
• Check that the water ow is correct, and adjust if
necessary.
• Check the blower for free rotation, and that it is
secured to the shaft.
• Verify that vibration isolation has been provided.
• Unit is serviceable. Be certain that all access
panels are secured in place.
UNIT START-UP
1. Set the thermostat to the highest setting.
2. Set the thermostat system switch to “COOL”,
and the fan switch to the “AUTO” position. The
reversing valve solenoid should energize. The
compressor and fan should not run.
3. Reduce the thermostat setting approximately 5
degrees below the room temperature.
4. Verify the heat pump is operating in the cooling
mode.
5. Turn the thermostat system switch to the “OFF”
position. The unit should stop running and the
reversing valve should de energize.
6. Leave the unit off for approximately (5) minutes
to allow for system equalization.
7. Turn the thermostat to the lowest setting.
8. Set the thermostat switch to “HEAT”.
9. Increase the thermostat setting approximately 5
degrees above the room temperature.
10. Verify the heat pump is operating in the heating
mode.
11. Set the thermostat to maintain the desired space
temperature.
12. Check for vibrations, leaks, etc.
HEAT RECOVERY PACKAGE
The Heat Recovery package is a factory mounted
option. It consists of a forced pumped unit that em-
ploys a circulating pump to move water through a
double wall/vented heat exchanger and returns the
heated water to the water tank. The water is heated by
superheated refrigerant discharge gas from the
compressor. This waste heat of the cooling mode
captured by the heat recovery increases the capacity
and efciency of the heat pump unit. If the air tempera-
ture is uncomfortable coming from the air vents in the
heating mode the heat recovery may need to be turned
off. In the heating mode the heat recovery captures
heat that would normally be used for space heating.
Caution
If heat recovery unit is installed in an area where
freezing may occur, the unit must be drained
during winter months to prevent heat exchanger
damage. Heat exchanger ruptures that occur due
to freezing will void the heat recovery package
warranty along with the heat pump warranty.
TYPICAL CONNECTION PIPING
WATER TANK PREPARATION:
1. Turn off electrical or fuel supply to the water heater.
2. Attach garden hose to water tank drain connection
and run other end of hose out doors or to an open
drain.
3. Close cold water inlet valve to water heater tank.
4. Drain tank by opening drain valve on the bottom
of the tank, then open pressure relief valve or hot
water faucet.
5. Once drained the tank should be ushed with
cold water until the water leaving the drain hose
is clear and free of sediment.
6. Close all valves and remove the drain hose.
7. Install HR water piping.
HR WATER PIPING:
All hot water piping should be a minimum of 3/8t
O.D. copper tube to a maximum distance of fteen
(15) feet. For distances beyond fteen feet but not
System Checkout

Subject to change without prior notice Revised 03-11
6 720 220 046
14 TA Series
exceeding sixty (60) feet use 1/2” copper tube. Sepa-
rately insulate all exposed surface of both connecting
water lines with 3/8” wall closed cell insulation. Install
isolation valves on supply and return to the heat
recovery. (Figure #9)
WATER TANK REFILL:
1. Open the cold water supply to the tank.
2. Open a hot water faucet to vent air from the system
until water ows from the faucet, then close.
3. Depress the hot water tank pressure relief valve handle
to ensure there is no air remaining in the tank.
4. Carefully inspect all plumbing for water leaks.
Correct as required.
5. Purge all air from HR by depressing the schrader
valve on the HR Unit. Allow all air to bleed out until
water appears at the valve.
6. Before restoring the power or fuel supply to the
water heater, adjust the temperature setting on the
tank thermostat(s) to ensure maximum utilization
of the heat available from the refrigeration system
and conserve the most energy. On tanks with both
upper and lower elements and thermostats, the
lower element should be turned down to 100° F,
while the upper element should be adjusted to
120° F. Depending upon the specic needs of
the customer, you may need to adjust the upper
element differently. On tanks with a single
thermostat lower the thermostat setting to 120°
F or the “LOW” position.
7. After thermostat adjustments are completed,
replace access cover and restore electrical or
fuel supply to water heater.
INITIAL START-UP:
1. Make sure all valves in heat recovery water
piping system are open. NEVER OPERATE HR
PUMP DRY.
2. Turn on the heat pump. The HR pump should not
run if the compressor is not running.
3. Turn HR switch to the “ON” position. The pump
will operate if entering water temperature to HR
is below 120° F.
4. The temperature difference between the water
entering and leaving the heat recovery should be
5° to 15° F.
5. Allow the unit to operate for 20 to 30 minutes to
ensure it is functioning properly. The pump
should shut off when the water temperature
entering the heat recovery reaches 120°F.
 WaterTankRell
Figure # 9

6 720 220 046
Revised 03-11 Subject to change without prior notice
15
TA Series
MAINTENANCE
1. Filter changes or cleanings are required at
regular intervals. The time period between lter
changes will depend upon type of environment
the equipment is used in. In a single family
home, that is not under construction, changing
or cleaning the lter every 60 days is sufcient.
In other applications such as motels, where daily
vacuuming produces a large amount of lint, lter
changes may be need to be as frequent as
biweekly.
Caution
Equipment should never be used during
construction due to likelihood of wall board
dust accumulation in the air coil of the
equipment which permanently affects the
performance and may shorten the life of the
equipment.
2. An annual “checkup” is recommended by a
licensed refrigeration mechanic. Recording the
performance measurements of volts, amps, and
water temperature differences (both heating and
cooling) is recommended. This data should be
compared to the information on the unit’s data
plate and the data taken at the original startup of
the equipment.
3. Lubrication of the blower motor is not required,
however may be performed on some motors to
extend motor life. Use SAE-20 non-detergent
electric motor oil.
4. The condensate drain should be checked
annually by cleaning and ushing to insure
proper drainage.
5. Periodic lockouts almost always are caused by
air or water ow problems. The lockout
(shutdown) of the unit is a normal protective
measure in the design of the equipment. If
continual lockouts occur call a mechanic
immediately and have them check for: water ow
problems, water temperature problems, air ow
problems or air temperature problems. Use of
the pressure and temperature charts for the unit
may be required to properly determine the
cause.
Maintenance
TROUBLESHOOTING
Problem Possible Cause Checks and Corrections
No Flow
Low Flow
No Power Check power supply
On/Off Switch Position Set switch to “ON” position
Compressor Contactor Engage heat pump contactor
Broken or loose wires Repair or tighten wires
Air Lock Purge air from piping system
Stuck pump shaft/impeller Remove pump cartridge and clean
Defective pump Replace pump
Kinked or under sized water piping Repair kink and check for proper line size
High Water
Temperature
Water temp limit closed Stuck limit switch
Sensor not attached securely to line
Low Heat
Output
Scaled or fouled heat exchanger Clean heat exchanger

Subject to change without prior notice Revised 03-11
6 720 220 046
16 TA Series Well Water Application
Figure 10: Well Water Application
WELL WATER APPLICATIONS (50°F EWT MIN.) 1. LINE VOLTAGE DISCONNECT (UNIT) 2. FLEX DUCT CONNECTION 3. LOW VOLTAGE CONTROL CONNECTION 4. LINE VOLTAGE CONNECTION 5. VIBRATION PAD 6. P/T PORTS 7. HOSE KITS (Optional) 8. BALL VALVES 9. SOLENOID VALVE SLOW CLOSING 10. CONDENSATE DRAIN CONNECTION 11. PRESSURE TANK (Optional) 12. LINE VOLTAGE DISCONNECT (ELECTRIC HEATER) NOTE: SEE FIGURE #3 FOR CONDENSATE DRAIN CONNECTION

6 720 220 046
Revised 03-11 Subject to change without prior notice
17
TA Series
CoolingTower/BoilerApplication
Figure11:CoolingTower/BoilerApplication
COOLING TOWER/BOILER APPLICATION 1. LINE VOLTAGE DISCONNECT (UNIT) 2. LOW VOLTAGE CONTROL CONNECTION 3. P/T PLUGS (Optional) 4. HOSE KITS (Optional) 5. BALL VALVES 6. SUPPLY AND RETURN LINES OF CENTRAL SYSTEM 7. FLEX DUCT CONNECTION 8. HANGING BRACKETS ASSEMBLY 9. THREADED ROD 10. HANGING BRACKET ASSEMBLY NOTE: SEE FIGURE #3 FOR CONDENSATE DRAIN CONNECTION

Subject to change without prior notice Revised 03-11
6 720 220 046
18 TA Series Earth Coupled Application
Figure 12: Earth Coupled Application
EARTH COUPLED APPLICATION 1. LINE VOLTAGE DISCONNECT (UNIT) 2. FLEX DUCT CONNECTION 3. LOW VOLTAGE CONTROL CONNECTION 4. LINE VOLTAGE CONNECTION (UNIT) 5. P/T PORTS 6. VIBRATION PAD 7. CONDENSATE DRAIN 8. GROUND LOOP CONNECTION KIT
(555-000,001)
9. GROUND LOOP PUMPING PACKAGE
(GL001-1 or 002-1)
10. POLYETHELENE WITH INSULATION 11. LINE VOLTAGE DISCONNECT (ELECTRIC
HEATER)
NOTE: SEE FIGURE #3 FOR CONDENSATE DRAIN CONNECTION

6 720 220 046
Revised 03-11 Subject to change without prior notice
19
TA SeriesTypical Wiring Diagram
FIGURE 13
TYPICAL WIRING DIAGRAM
SinglePhaseECMBlowerMotor

Subject to change without prior notice Revised 03-11
6 720 220 046
20 TA Series
TYPICAL WIRING DIAGRAM
SinglePhaseECMBlowerMotor — ElectricHeat
Typical Wiring Diagram