Bryant Gt 024 User manual

GT Series
Geothermal Heat Pump
Sizes 024, 036, 048, 060, 072
Installation Instructions
NOTE: Read the entire instruction manual before starting the installation.
TABLE OF CONTENTS
PAGE NO.
SAFETY CONSIDERATIONS 2......................................................................
APPLICATION CONSIDERATIONS 3.................................................................
Geothermal Systems 3..........................................................................
Well Water Systems 4...........................................................................
INSTALLATION RECOMMENDATIONS 6............................................................
MOUNTING VERTICAL UNITS 8....................................................................
MOUNTING HORIZONTAL UNITS 8.................................................................
CONDENSATE DRAIN 8.............................................................................
DUCT SYSTEM 8...................................................................................
PIPING 9..........................................................................................
ELECTRICAL 9....................................................................................
Safety Devices and UPM Controller 10..............................................................
ECM Interface Board 14.........................................................................
Constant Airflow Motor 17.......................................................................
Pump Relay 17................................................................................
Comfort Alert Diagnostics Module (CADM) 17.......................................................
FACTORY INSTALLED FEATURES 18.................................................................
Smart Start Assist 18............................................................................
Heat Recovery Package (HRP) 19..................................................................
FIELD INSTALLED ACCESSORIES 20.................................................................
SEQUENCE OF OPERATION 21.......................................................................
Cooling Mode 21...............................................................................
Heating Mode 21...............................................................................
ELECTRONIC THERMOSTAT INSTALLATION 21......................................................
SYSTEM CHECKOUT 22.............................................................................
UNIT START--UP 22..................................................................................
MAINTENANCE 22..................................................................................
TROUBLESHOOTING 23.............................................................................
OPERATING TEMPERATURES AND PRESSURES TABLES 27............................................
AIRFLOW TABLES 31...............................................................................
WATER SIDE PRESSURE DROP TABLE 33.............................................................
SMART START LED INDICATORS 34..................................................................
CONFIGURATIONS 34...............................................................................
Horizontal Configuration 34
......................................................................
Counter--Flow Configuration 40...................................................................
Vertical Configuration 40.........................................................................

2
Information in these installation instructions pertains only to GT
series units.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes and
current editions of the National Electrical Code ( NEC ) NFPA 70.
In Canada, refer to current editions of the Canadian electrical code
CSA 22.1.
Recognize safety information. This is the safety--alert symbol !!
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury. Understand
these signal words; DANGER, WARNING, and CAUTION. These
words are used with the safety--alert symbol. DANGER identifies
the most serious hazards which will result in severe personal injury
or death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify unsafe
practices which would result in minor personal injury or product
and property damage. NOTE is used to highlight suggestions
which will result in enhanced installation, reliability, or operation.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when
handling parts.
CAUTION
!
!WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal injury
or equipment damage.
PuronRrefrigerant systems operate at higher pressures than
standard R--22 systems. Do not use R--22 service equipment
or components on PuronRrefrigerant equipment.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.
!WARNING
1
2
3
A14032
Fig. 1 -- Standard Package
1. GT Series Water--To Air Heat Pump
2. Installation and Owner’s Manual
3. Hanging Bracket Kit (HZ unit only)

3
APPLICATION CONSIDERATIONS
Geothermal Systems
Closed loop and pond applications require specialized design
knowledge. No attempt at these installations should be made unless
the dealer has received specialized training. Anti--freeze solutions
are utilized when low evaporating conditions are expected to occur.
Refer to the Flow Center installation manuals for more specific
instructions. (See Fig. 2)
Diagram shows typical
installation and is for
illustration purposes
only. Ensure access to
Heat Pump is not
restricted.
(1) Line Voltage Disconnect (unit) (8) Ground Loop Connection Kit
(2) Flex Duct Connection (9) Ground Loop Pumping Package
(3) Low Voltage Control Connection (10) Polyethylene with Insulation
(4) Line Voltage Connection (11) Line Voltage Disconnect (electric heater)
(5) P/T Ports
(6) Vibration Pad
(7) Condensate Drain Connection
A14132
Fig. 2 -- Example Geothermal System Setup

4
Well Water Systems
IMPORTANT: Table 1 must be consulted for water quality
requirements when using open loop systems. A water sample must
be obtained and tested, with the results compared to the table.
Scaling potential should be assessed using the pH/Calcium
hardness method. If the pH is <7.5 and the calcium hardness is
l<100 ppm, the potential for scaling is low. For numbers out of the
range listed, a monitoring plan must be implemented due to
probable scaling.
Other potential issues such as iron fouling, corrosion, erosion and
clogging must be considered. Careful attention to water conditions
must be exercised when considering a well water application.
Failure to perform water testing and/or applying a geothermal heat
pump to a water supply that does not fall within the accepted
quality parameters will be considered a mis--application of the unit
and resulting heat exchanger failures will not be covered under
warranty. Where a geothermal system will be used with adverse
water conditions, a suitable plate--frame heat exchanger MUST be
used to isolate the well water from the geothermal unit.
Proper testing is required 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 cupronickel heat exchanger is recommended. Copper is
adequate for ground water that is not high in mineral content.
In well water applications, water pressure must always be
maintained in the heat exchanger. This can be accomplished with
either a control valve or a bladder type expansion tank.
When using a single water well to supply both domestic water and
the heat pump, care must be taken to insure that the well can
provide sufficient flow for both.
In well water applications, a slow closing solenoid valve must be
used to prevent water hammer (hammering or stuttering sound in
the pipeline). Solenoid valves should be connected across Y1 and
C1 on the thermostat interface board for all. Make sure that the VA
draw of the valve does not exceed the contact rating of the
thermostat. (See Fig. 3)
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Discharge air configuration change is not possible on Heat
Pumps equipped with Electric Heat Option.
1
2
3
4
5
6
7
Typical Installation shown for
illustration purposes only.
9
8
10
11
12
13
(1) Flex Duct Connection (8) Hose Kits (optional)
(2) Low Voltage Control Connection (9) Pressure Tank (optional)
(3) Vibration Pad (10) P/T Ports (optional)
(4) Ball Valves (11) Line Voltage Connection
(5) Solenoid Valve Slow Closing (12) Electric Heater Line Voltage Disconnect
(6) Condensate Drain Connection (13) Unit Line Voltage Disconnect
(7) Drain Valves
A14130
Fig. 3 -- Example Well Water System Setup

5
Table 1 – Water Quality Requirements for Open--Loop Geothermal Heat Pump System
Water Quality Parameter HX Material Closed Recirculating Open Loop and Recirculating Well
Scaling Potential - Primary Measurement
Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below:
pH/Calcium Hardness
Method All -- pH <7.5 and Ca Hardness <100ppm
Index Limits for Probable Scaling Situations - (Operation outside these limits is not recommended)
Scaling indexes should be calculated at 150°F for direct use and HWG applications, and at 90°F for indirect HX use.
A monitoring plan should be implemented.
Ryznar Stability Index All -- 6.0 - 7.5
If > 7.5 minimize steel pipe use
Langelier Saturation Index All --
-0.5 to +0.5
If <-0.5 minimize steel pipe use.
Based upon 150°F HWG and Direct well,
84°F Indirect Well HX
Iron Fouling
Iron Fe² (Ferrous)
(Bacterial Iron Potential) All --
<0.2 ppm (Ferrous)
If Fe²* (ferrous) >0.2 ppm with pH 6-8, O2<5 ppm check
for iron bacteria
Iron Fouling All -- <0.5 ppm of Oxygen
Above this level deposition will occur
Corrosion Prevention
pH All 6-8.5
Monitor/treat as needed
6-8.5
Minimize steel pipe below 7 and no open tanks with pH <8
Hydrogen Sulfide (H2S) All --
At H S>0.2 ppm, avoid use of copper and copper nickel
piping or HXs. Rotten egg smell appears at 0.5 ppm level.
Copper alloy (bronze or brass) cast components are OK
to <0.5 ppm
Ammonia ion as hydroxide,
chloride, nitrate and sulfate
compounds
All -- <0.5 ppm
Maximum Chloride Levels
Maximum Allowable at Maximum Water Temperature
50°F 75°F 100°F
Copper -- <20 ppm NR NR
cupronickel -- <150 ppm NR NR
304 SS -- <400 ppm <250 ppm <150 ppm
316 SS -- <1000 ppm <550 ppm <375 ppm
Titanium -- >1000 ppm >550 ppm >375 ppm
Erosion and Clogging
Particulate Size and
Erosion All
<10 ppm of particles and a
maximum velocity of 1.8 m/s.
Filtered for maximum 841 mi-
cron [0.84 mm 20 mesh] size
<10 ppm (<1 ppm "sandfree" for reinjection) of particles
and a maximum velocity of 1.8 m/s. Filtered for maximum
841 micron [0.84 mm. 20 mesh] size. Any particulate that
is not removed can potentially clog components
NOTES:
SClosed recirculating system is identified by a closed pressurized piping system.
SRecirculating open wells should observe the open recirculating design considerations.
SNR - application not recommended
S"—" No design Maximum

6
INSTALLATION RECOMMENDATIONS
The Water--to--Air Heat Pumps are designed to operate with
entering fluid temperature between 20_Fto90_F in the heating
mode and between 30_F to 120_F in the cooling mode.
NOTE:50_minimum Entering Water Temperature (EWT) is
recommended for well water applications with sufficient water
flow to prevent freezing. Antifreeze solution is required for all
closed loop applications or EWT less than 45_. Cooling
Tower/Boiler and Geothermal applications should have sufficient
antifreeze solution to protect against extreme conditions and
equipment failure. Frozen water coils are not covered under
warranty. Other equivalent methods of temperature control are
acceptable.
Check Equipment and Job Site
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.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
If unit stacking is required for storage, stack units as follows:
Do not stack units larger than 6 tons!
Vertical units: less than 6 tons, no more than two high.
Horizontals units: less than 6 tons, no more than three high.
CAUTION
!
Inspect Equipment
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 filing 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.
Location / Clearance
Locate the unit in an indoor area that allows easy removal of the
filter and access panels, and has enough room for service personnel
to perform maintenance or repair. Provide sufficient room to make
fluid, electrical, and duct connection(s). If the unit is located in a
confined space such as a closet, provisions must be made for return
air to freely enter the face of unit’s air coil. On horizontal units,
allow adequate room below the unit for a condensate drain trap and
do not locate the unit above supply piping.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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.
CAUTION
!
UNIT DAMAGE AND/OR OPERATION HAZARD
Failure to follow this caution may result in equipment
damage and/or improper equipment operation.
It is extremely important to take the proper precautions to
insure that the heat pump unit is installed in the proper
location and that measures have been taken to prevent
rupturing the water coil due to freezing conditions.
Frozen water coils are not covered under the limited
product warranty.

7
THERMOSTAT
R C G O Y1 Y2 W1 W2 H C
CFM ADJUST
TO ECM MOTOR
A
B
C
D
NORM (+) (-)
TEST YES
HGRH
NO
CFM
P1
OR
GN/
BK YL BR WH
P2
GY
RD
BL
P13
GY
PU
J1 J2 J13
ORGN/
BK
YL BR WH GY
RD
BL GYPU
J14
WHBL OR BR YL
J15
GY
RD
GN/
BK
J17
GY
PU
BK WH
GN/
YL
L1
BK
L2
WH
J19
P19
CONTROL
LOW VOLT HIGH VOLT
A150437
Fig. 4 -- Constant Airflow Motor

8
MOUNTING VERTICAL UNITS
Vertical units should be mounted level on a vibration absorbing
pad slightly larger than the base to minimize vibration transmission
to the building structure. It is not necessary to anchor the unit to the
floor. See Fig. 5.
NOTE: On VT and CF units, the condensate drain pan is
internally sloped. There is no internal P--Trap.
VIBRATION PAD
FULL SIZE
A14117
Fig. 5 -- Vibration Absorbing Pad
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 manufacturer recommends these be
attached to the unit corners by hanger bracket kits. The rods must
be securely anchored to the ceiling. Refer to the hanging bracket
assembly and installation instructions for details.
IMPORTANT: 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 floor 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 overflow or
water leakage damage to the ceiling.
The secondary drain 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 flooding of the electrical parts due to heavy
rains.
NOTE: HZ unit condensate drain pan is NOT internally sloped.
IMPORTANT: Horizontal (HZ) units must be installed pitched
toward the Condensate Drain Connection 1/8” per foot.
CONDENSATE DRAIN
A14118
Fig. 6 -- 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 flow away from the unit.
IMPORTANT: This connection must be in conformance with
local plumbing codes. A trap must be installed in the
condensate line to insure free condensate flow.
NOTE: HZ heat pump drain pan is not internally sloped.
A vertical air vent is sometimes required to avoid air pockets. 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.
DUCT SYSTEM
A supply air outlet collar and return air duct flange are provided on
all units to facilitate duct connections.
NOTE: Supply air duct and return air duct flanges are shipped
unfolded with unit.
Fold the duct flange outwards along the perforated line. Refer to
unit Dimensional Drawings for physical dimensions of the collar
and flange.
A flexible 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 from 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.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper
equipment operation.
Do not connect discharge ducts directly to the blower
outlet.
The factory provided air filter must be removed when using a filter
back return air grill. The factory filter 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 duct work, 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 duct work should be installed.
Check for existing leaks and repair.
The duct system and all diffusers should be sized to handle the
designed air flow quietly. To maximize sound attenuation of the
unit blower, the supply and return air plenums should be insulated.

9
There should be no direct straight air path through 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 flow are a problem, the blower
speed can be changed to a lower speed to reduce air flow.
PIPING
Supply and return piping must be as large as the unit connections
on the heat pump (larger on long runs).
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper
equipment operation.
Never use flexible hoses of a smaller inside diameter than
that of the fluid connections on the unit.
GT units are supplied with either a copper or optional cupronickel
condenser. Copper is adequate for ground water that is not high in
mineral content.
NOTE: Proper testing is recommended to assure the well water
quality is suitable for use with water source equipment. When in
doubt, use cupronickel. See Application Considerations notes on
page 4.
In conditions anticipating moderate scale formation or in brackish
water, a cupronickel 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 flow 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.
CAUTION
!
EQUIPMENT DAMAGE AND/OR UNIT
OPERATION HAZARD
Failure to follow this caution may result in equipment
damage and/or improper operation.
Never exceed the recommended water flow 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 fittings. Consult Unit
Dimensional Drawings.
NOTE: Teflon tape sealer should be used when connecting water
piping connections to the units to insure against leaks and possible
heat exchanger fouling.
NOTE: The unit is shipped with water connection O--rings. A 10
pack of O--rings (part #4026) can be ordered through Replacement
Components Division (RCD).
IMPORTANT: Do not over--tighten 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 flow
balancing (on open--loop systems).
ELECTRICAL
Refer to electrical component box layout. See Fig. 7.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage and/or improper operation.
SField wiring must comply with local and national
electrical codes.
SPower to the unit must be within the operating voltage
range indicated on the unit nameplate or on the
performance data sheet.
SOperation of unit on improper line voltage or with
excessive phase imbalance will be hazardous to the unit,
constitutes abuse, and may void the warranty.
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 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 line side of compressor
contactor as indicated on the wiring diagrams.
IMPORTANT: Units supplied with internal electric heat
require two (2) separate power supplies:
1) Unit compressor
2) Electric Heat, blower motor and control circuit.
Refer to the ELECTRIC HEATER PACKAGE OPTION section.
See data plate for minimum circuit ampacities and maximum
fuse/breaker sizing.
1
2
34
5
6
7
8
A14119
(1) Compressor Contactor (5) Auxiliary Pump Relay (Option)
(2) Comfort Alert Module (6) Transformer
(3) Second Stage Relay (7) Capacitor
(4) Unit Protection Module (UPM) (8) ECM Module
-- mounts on E--box cover
Fig. 7 -- Electrical Component Box Layout

10
Safety Devices and UPM Controller
1
2
3
4
5
6
7910
11
1213
17
14
15
16
8
A14120
(1) Board Power Indicator (10) Compressor Contact Output
(2) UPM Status LED Indicator (11) High Pressure Switch Connection
(3) Water Coil Freeze Protection
Temperature Selection [R30]
(12) Call for Compressor Y1
(4) Air Coil Freeze Protection
Temperature Selection
(13) Low Pressure Switch Connection
(5) UPM Board Settings (14) 24VAC Power Common
(6) Water Coil Freeze Connection (15) Condensate Overflow Sensor
(7) Air Coil Freeze Connection (16) Dry Contact
(8) LCD Unit Display Connection (17) UPM Ground Standoff
(9) 24VAC Power Input
Fig. 8 -- Safety Device and UPM Controller
NOTES:
1. If the unit is being connected to a thermostat with a mal-
function light, this connection is made at the unit malfunc-
tion output or relay. Refer to Fig. 8.
2. If the thermostat is provided with a malfunction light pow-
ered off of the common (C) side of the transformer, a
jumper between “R” and “COM” terminal of “ALR” con-
tacts must be made.
3. If the thermostat is provided with a malfunction light pow-
ered off of the hot (R) side of the transformer, then the ther-
mostat malfunction light connection should be connected
directly to the (ALR) contact on the unit’s UPM board.
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:
SHigh pressure switch located in the refrigerant discharge line and
wired across the HPC terminals on the UPM.
SLow pressure switch located in the unit refrigerant suction line
and wired across terminals LPC1 and LPC2 on the UPM.
NOTE: UPM Board Dry Contacts are normally open (NO)
SWater side freeze protection sensor, mounted close to condensing
water coil, monitors refrigerant temperature between condensing
water coil and thermal expansion valve. If temperature drops
below or remains at freeze limit trip for 30 seconds, the controller
will shut down the compressor and enter into a soft lockout
condition.
The default freeze limit trip is 26_F, however this can be changed
to 15_F by cutting the R30 or Freeze1 resistor located on top of
DIP switch SW1 (Refer to Fig. 8, item (3) for resistor location),
RefertoFig.9forsensorlocation.
A14121
Fig. 9 -- Freeze Protection Sensor Location
CAUTION
!
UNIT DAMAGE AND/OR OPERATION HAZARD
Failure to follow this caution may result in unit damage
and/or improper equipment operation.
If unit is employing a fresh water system (no anti--freeze
protection), it is extremely important to have the Freeze1
R30 resistor set to 26_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.
SEvaporator freeze protection sensor, mounted after the thermal
expansion device and the evaporator, monitors refrigerant
temperature between the evaporator coil and thermal expansion
valve. If temperature drops below or remains at freeze limit trip
for 30 seconds, the controller will shut down the compressor and
enter into a soft lockout condition. The default freeze limit trip is
26_F. See Fig. 10.
A14122
Fig. 10 -- Evaporator Freeze Protection Sensor Location

11
SThe condensate overflow protection sensor is located in the drain
pan of the unit and connected to the ”COND” terminal on the
UPM board. See Fig. 11.
A14123
Fig. 11 -- Condensate Overflow Protection Sensor Location
UPM Board Factory Default Settings
TEMP 30°F
LOCKOUT 2
RESET Y
ALARM PULSE
TEST NO
UPM DIP SWITCH DEFAULT POSITION
lockout 4
reset RY
alarm Cont
test yes
pulse
no
2
The UPM Board includes the following features:
SANTI--SHORT CYCLE TIMER: 5 minute delay on break
timer to prevent compressor short cycling.
SRANDOM START: Each controller has an unique random start
delay ranging from 270 to 300 seconds on initial power up to
reduce the chance of multiple unit simultaneously starting at the
same time after power up or after a power interruption, thus
avoiding creating large electrical spike.
SLOW PRESSURE BYPASS TIMER:Ifthecompressoris
running and the low pressure switch opens, the controller will
keep the compressor ON for 120 seconds. After 2 minutes if the
low pressure switch remains open, the controllers 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 lockout. In
order to exit hard lockout power to the unit would need to bereset.
SBROWNOUT / SURGE / POWER INTERRUPTION
PROTECTION: The brownout protection in the UPM board
will shut does the compressor if the incoming power falls below
18 VAC. The compressor will remain OFF until the voltage is
above 18 VAC and ANTI--SHORT CYCLE TIMER (300
seconds) times out. The unit will not go into a hard lockout.
SMALFUNCTION OUTPUT: Alarm output is Normally Open
(NO) dry contact. If pulse is selected the alarm output will be
pulsed. The fault output will depend on the dip switch setting for
”ALARM”. If it is set to ”CONT”, a continuous 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 explanation. The remote device must have a
malfunction detection capability when the UPM board is set to
”PULSE”.
NOTE: If 24 VAC output is needed, R must be wired to
ALR--COM terminal; 24 VAC will be available on the ALR--OUT
terminal when the unit is in the alarm condition.
SDISPLAY OUTPUT: The Display output is a pulse output
connected to the Unit Diagnostic Display (UDD) and it pulses
24VAC when the unit is in an lockout alarm condition.
SUPM TEST MODE: UPM test mode will allow all time--delay
settings to be reduced to 10 seconds for troubleshooting and
verification of unit operation. Reset unit to TEST mode: NO
when test is completed. During UPM test mode, the UPM LED
will flash a FREEZE SENSOR 6 flash code. Test mode will
automatically defeat after approximately 5 minutes with no LED
flash and normal delays.
CAUTION
!
UNIT DAMAGE AND/OR OPERATION HAZARD
Failure to follow this caution may result in unit damage
and/or improper equipment operation.
Operation of unit in test mode can lead to accelerated wear
and premature failure of components. The ”TEST” switch
must be set back to ”NO” after troubleshooting/ servicing.
SFREEZE SENSOR: The default setting for the freeze limit trip is
26_F (sensor number 1); however this can be changed to 15_Fby
cutting the R30 resistor located on top of the DIP switch SW1.
Since freeze sensor 2 is dedicated to monitor the evaporator coil, it
is recommended to leave the factory default setting on the board.
The UPM controller will constantly monitor the refrigerant
temperature with the sensor mounted close to the condensing
water coil between the thermal expansion valve and water coil. If
temperature drops below or remains at the freeze limit trip for 30
seconds, the controller will shut the compressor down and enter
into a soft lockout condition. Both the status LED and the Alarm
contact will be active.
The LED will flash the code associated with this alarm condition
three (3) times. If this alarm occurs 2 times (or 4 if Dip switch is set
to 4) within an hour, the UPM controller will enter into a hard
lockout condition. It will constantly monitor the refrigerant
temperature with the sensor mounted close to the evaporator
between the thermal expansion valve and evaporator coil as
shown in Fig. 10.
If temperature drops below or remains at the freeze limit trip for
30 seconds, the controller will shut the compressor down and
enter into a soft lockout condition. Both the status LED and the
alarm contact will be active. The LED will flash the code
associated with this alarm condition six (6) times. If this alarm
occurs 2 times (or 4 if Dip switch is set to 4) within an hour, the
controller will enter into a hard lockout condition.
CAUTION
!
UNIT DAMAGE AND/OR OPERATION HAZARD
Failure to follow this caution may result in unit damage
and/or improper equipment operation.
Freeze sensor will not guard against the loss of water. A
flow switch is recommended to prevent the unit from
running if water flow is lost or reduced.

12
Table 2 – 10K Temperature Sensor Resistance Table
°C °F OHM °C °F OHM °C °F OHM °C °F OHM
--- 5 5 --- 6 7 963,800 --- 9 16 52,410 37 99 6,015 83 181 1,141
--- 5 4 --- 6 5 895,300 --- 8 18 49,660 38 100 5,774 84 183 1,105
--- 5 3 --- 6 3 832,100 --- 7 19 47,070 39 102 5,545 85 185 1,071
--- 5 2 --- 6 2 776,800 --- 6 21 44,630 40 104 5,326 86 187 1,038
--- 5 1 --- 6 0 719,900 --- 5 23 42,330 41 106 5,116 87 189 1,006
--- 5 0 --- 5 8 670,200 --- 4 25 40,160 42 108 4,916 88 190 975
--- 4 9 --- 5 6 624,200 --- 3 27 38,120 43 109 4,725 89 192 945
--- 4 8 --- 5 4 581,600 --- 2 28 36,190 44 111 4,542 90 194 916
--- 4 7 --- 5 3 542,200 --- 1 30 34,370 45 113 4,368 91 196 889
--- 4 6 --- 5 1 505,800 032 32,650 46 115 4,201 92 198 862
--- 4 5 --- 4 9 472,000 134 31,030 47 117 4,041 93 199 836
--- 4 4 --- 4 7 440,700 236 29,500 48 118 3,888 94 201 811
--- 4 3 --- 4 5 411,600 337 28,050 49 120 3,742 95 203 787
--- 4 2 --- 4 4 384,700 439 26,690 50 122 3,602 96 205 764
--- 4 1 --- 4 2 359,700 541 24,400 51 124 3,468 97 207 741
--- 4 0 --- 4 0 336,500 643 24,170 52 126 3,339 98 208 720
--- 3 9 --- 3 8 314,900 745 23,020 53 127 3,216 99 210 699
--- 3 8 --- 3 6 294,900 846 21,920 54 129 3,099 100 212 679
--- 3 7 --- 3 5 276,200 948 20,890 55 131 2,986 101 214 659
--- 3 6 --- 3 3 258,800 10 50 19,900 56 133 2,878 102 216 640
--- 3 5 --- 3 1 242,700 11 52 18,970 57 135 2,774 103 217 622
--- 3 4 --- 2 9 227,600 12 54 18,090 58 136 2,674 104 219 604
--- 3 3 --- 2 7 213,600 13 55 17,260 59 138 2,579 105 221 587
--- 3 2 --- 2 6 200,500 14 57 16,470 60 140 2,488 106 223 571
--- 3 1 --- 2 4 188,300 15 59 15,710 61 142 2,400 107 225 555
--- 3 0 --- 2 2 177,000 16 61 15,000 62 144 2,316 108 226 539
--- 2 9 --- 2 0 166,400 17 63 14,330 63 145 2,235 109 228 525
--- 2 8 --- 1 8 156,400 18 64 13,380 64 147 2,157 110 230 510
--- 2 7 --- 1 7 147,200 19 66 13,070 65 149 2,083 111 232 496
--- 2 6 --- 1 5 138,500 20 68 12,490 66 151 2,011 112 234 483
--- 2 5 --- 1 3 130,400 21 70 11,940 67 153 1,942 113 235 470
--- 2 4 --- 1 1 122,800 22 72 11,420 68 154 1,876 114 237 457
--- 2 3 --- 9 115,800 23 73 10,920 69 156 1,813 115 239 445
--- 2 2 --- 8 109,100 24 75 10,450 70 158 1,752 116 241 433
--- 2 1 --- 6 102,900 25 77 10,000 71 160 1,693 117 243 422
--- 2 0 --- 4 97,080 26 79 9,573 72 162 1,637 118 244 411
--- 1 9 --- 2 91,620 27 81 9,166 73 163 1,583 119 246 400
--- 1 8 086,500 28 82 8,778 74 165 1,531 120 248 389
--- 1 7 181,700 29 84 8,409 75 167 1,480 121 250 379
--- 1 6 377,190 30 86 8,057 76 169 1,432 122 252 370
--- 1 5 572,960 31 88 7,722 77 171 1,386 123 253 360
--- 1 4 768,980 32 90 7,402 78 172 1,341 124 255 351
--- 1 3 965,250 33 91 7,098 79 174 1,298 125 257 342
--- 1 2 10 61,740 34 93 6,808 80 176 1,256 126 259 333
--- 1 1 12 58,440 35 95 6,531 81 178 1,216 127 261 325
--- 1 0 14 55,330 36 97 6,267 82 180 1,178 128 262 317
SHIGH PRESSURE SWITCH: The high pressure switch safety
is designed to shut down the compressor if it exceeds limits. Cut
in 420 +/-- 15 psig and cut out 600 +/-- psig.
SLOW PRESSURE SWITCH: The low pressure switch safety is
designed to shut down the compressor of loss of charge. Cut in 60
+/-- 15 psig and cut out 40 +/-- psig.
SINTELLIGENT 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 overflow fault will cause the unit to go into a
hard lockout immediately, and will require a manual lockout reset.
SLOCKOUT 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”.
NOTES: The blower motor will remain active during a lockout
condition.
SECM TEST MODE: ECM test mode is to override the motor to
constant torque mode for motor troubleshooting. If the motor
runs in ECM test mode, the module and motor are good. To
engage in ECM test mode, only one switch can be selected. Select
TEST ON and all others OFF. Reset the board to NORM ON and
TEST OFF when test is complete.
If the unit remains in test mode for normal operation, the system
will not run different CFMs based on thermostat call such as Y1,
Y2 or dehumidify. It may also experience problems with
nuisance strip during electric heat operation.
There is no way to check CFM based on number of blinks if the
board is set to test mode.

13
CC
LOCKOUT CAN BE SET
TO 4 VIA DIP SWITCH
BLINK CODE ON STATUS LED
SOFT LOCKOUT
RECORD ALARM
START COUNTER (IF APPLICABLE)
CC OUTPUT = ON
NO
YES
LPC
=CLOSED
FRZ >TEMP
LIMIT
Y1 = ON
TIME > 30
SEC
CON > 0
POWER/ SWITCHES/SENSOR
STATUS CHECK
START
TIMER
NO
YES
NO
YES
NO
YES
T > ASC OR
RS SEC
YES
NO
TIME > 120
SEC
START
TIMER
NO
YES
NO
YES
START
ANTI SHORT CYCLE
INITIAL
POWER UP
YES
NO
START
RANDOM START UP
START
COUNTER
NEEDED?
YES
COUNT = 2
OR
COUNT = 4
BLINK CODE ON STATUS LED
DISPLAY OUTPUT = PULSE
ALR OUTPUT = ON/PULSE
NO
YES
HARD
LOCKOUT?
CC OUTPUT = OFF
V > 18VAC
NO
YES YES
NO
BLINK CODE
ON STATUS LED
NO
RESET ON
Y
CLEAR FAULTS
R = 24VAC
NO
YES NO
YES
NO
YES
HPC =
CLOSED
RESET ON R
A14129
Fig. 12 -- UPM Sequence of Operation (SOO) Flow Chart

14
ECM INTERFACE BOARD
Refer to Fig. 7, item (12) for ECM interface board location. In
addition to providing a connecting point for thermostat wiring, the
interface board also translates thermostat inputs into control
commands for the Electronic Commutated Motor (ECM) DC fan
motor and provides thermostat signals to unit’s UPM board. The
thermostat connections and their functions are as follows:
10 1
27
8
9511
46
3
A14124
(1) Motor Harness Plug (7) Thermostat Input Status Indication
(2) Blower CFM Adjustment (8) Reheat Digital Outputs
(3) Motor Settings (9) Thermostat Outputs
(4) Dehumidification Indication (10) 24 VAC
(5) Thermostat Contact Inputs (11) Dehumidification Method Selector
(6) CFM Count Indicator
Fig. 13 -- ECM Interface Board
NOTE: CFM LED indication is an approximation. Utilize
conventional Test and Balance equipment for accurate airflow
measurement.
SCFM count indicator (see Fig. 13, item 6) blinks to indicate
approximate airflow in CFM and may flicker when the unit is off.
SEach blink of the LED represent approximately 100 CFM of air
delivery so if the LED blinks 12 times, pauses, blinks 12 times,
etc. the blower is delivering approximately 1200 CFM.
Dehumidification Mode
Position the HGRH DIP switch in the “NO” (OFF) position.
When the switch is in this position, upon a dehumidification call,
the unit will operate at a lower speed to increase dehumidification
while cooling. See Fig. 14.
A14126
Fig. 14 -- Dehumidification Method Selector
Thermostat Outputs
Dry Contact Left side terminal strip in the stat, D1, D2
YI First Stage Compressor Cool
Y/Y2 Second Stage Compressor Cool
W1 Auxiliary Electric Heat
(runs in conjunction with compressor)
W2/E Emergency Heat (electric heat only)
O Reversing Valve (energized in cooling)
GFan
R Transformer 24 VAC Hot
C Transformer 24 VAC Common
NOTE: When unit is used with Carrier and Bryant thermostats
with Relative Humidity Control (Carrier Edge TP--PRH or
TP--NRH / Bryant Preferred T6--PRH or T6--NRH), the unit’s
dehumidification mode is in reverse logic and will not activate
dehum unless a relay, as shown in Fig. 15, is used. A simplified
explanation of the reverse logic follows.
RH ECM
Stat Logic: Board Logic:
No Dehum Demand: Dh -- energized Dh--not energized
Dehum Demand: Dh -- de--energized Dh -- energized
Y1
Y2
W1
O
G
R
C
LOW VOLTAGE CLASS II WIRING – 18AWG
W2
24V INPUTS
BLOWER
REVERSING VALVE
HEATING STAGE 1
COOLING STAGE 2
COOLING STAGE 1
HEATING STAGE 2
ECM CONTROLLER INTERFACE
STLOVENIL
CAV42 EX: 230VAC
H
Y1
Y2
W1
O/B
G
R
C
24VAC (HOT)
24VAC (COMMON)
BLOWER
SWITCH OVER VALVE
W2/E
HEATING STAGE 2
24V OUTPUTS
HEATING STAGE 1
COOLING STAGE 2
COOLING STAGE 1
Dry
Contact
THERMOSTAT
HUMIDISTAT
DE-HUMIDIFICATION CALL HGRH
YES NO
DHR – DEHUMIDIFICATION RELAY
FIELD INSTALLED
C
RELAY
A150487
Fig. 15 -- Cool to Dehumidify Application for Thermostats with Dehumidification
(Not required for Cor / Housewise thermostats)

15
Dehumidification Configuration
For Cor/Housewise Thermostats
(Carrier: TP--WEM01 / Bryant: T6--WEM01)
These thermostats allow dehum operation without need for a relay
if the dehum active status is selected to “Closed”
NOTE: Super--dehum mode is not available in screen options
when DEHUM ACTIVE status is selected and is not recommended
if using DEHUM ACTIVE status of “Open” and a relay. Airflows
programmed in the control boards will not provide super dehum
operation.
During the guided setup process, configure the thermostat with a
dehumidifier on the output that is powered by the thermostat.
Following is an example of the thermostat display screen during
guided equipment setup process.
By default, the thermostat will configure the dehumidifier output
(ACC+) as ACTIVE OPEN. For geothermal heat pumps, this
configuration setting will need to be changed to ACTIVE
CLOSED.
The setting can be changed on the thermostat by going to:
Menu > Service (hold for 10 sec) > Installation Settings >
Equipment Setup > Accessory > Dehum Active
Super Dehumidification
Super Dehumidification should NOT be used with geothermal heat
pumps.
Cor/Housewise with Field Installed Relay
If motor intermittently runs with no call, refer to Fig 16.
NOTE: In thermostats with triacs, such as the Core or Housewise,
there is potential for the triac to bleed slight voltage to the blower
circuit. In some cases it is low enough to be unnoticeable but in
rare occasions the voltage trickle could be enough (typically >8.5
volts) to bump over the blower intermittently with no G call. If
this occurs, it is recommended to add a normally open relay in the
blower circuit. Refer to Fig 16.
Y1
Y2
W1
O
G
R
C
LOW VOLTAGE CLASS II WIRING – 18AWG
W2
24V INPUTS
BLOWER
REVERSING VALVE
HEATING STAGE 1
COOLING STAGE 2
COOLING STAGE 1
HEATING STAGE 2
ECM CONTROLLER INTERFACE
STLOVENIL
CAV42 EX: 230VAC
H
Y1
Y2
W1
O/B
G
R
C
24VAC (HOT)
24VAC (COMMON)
BLOWER
SWITCH OVER VALVE
W2/E
HEATING STAGE 2
24V OUTPUTS
HEATING STAGE 1
COOLING STAGE 2
COOLING STAGE 1
H
THERMOSTAT
HUMIDISTAT
DE-HUMIDIFICATION CALL HGRH
YES NO
DHR – DEHUMIDIFICATION RELAY
FIELD INSTALLED
C
RELAY
A150489
Fig. 16 -- Wiring for Cor / Housewise Adjusted for Geothermal Application

16
BLOWER MOTOR = OFF
NO
YES
NO
YES
DELAY = A
HGRH SW =
YES
Y1=ON
G = ON
Y2 = ON
ADJUST / DELAY STATUS DIP
SWITCH CHECK
NO
YES
NO
YES
NO
YES
ADJ =
NORMAL
NO
YES
TB01-H
YES
NO
ADJ = + ADJ = -
DELAY = B DELAY = C
ADJ = TEST
DELAY = C
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
P13-H = 0
J01-10 = 24VAC
P13-H = TB01-H
FAN ONLY (K FAN )CFM
BLOWER RUNS RUNS IN
PART LOAD CFM
Y1 PERCENTAGE
BLOWER RUNS RUNS IN
FULL LOAD CFM
Y2 PERCENTAGE
RUN MOTOR IN NOMINAL CFM
ENERGIZE H OUTPUT
P13-H = ON
ENABLE DEHUMIDIFY ON MOTOR
DE-ENERGIZE J01-10 (BK10 =0)
WHEN SENSING H SIGNAL FROM
TSTAT
TB01-H = ON
NO
YES
Y1=ON
Y2 = ON
NO
YES
NO
YES
BLOWER RUNS RUNS IN
PART LOAD CFM
Y1 PERCENTAGE TIMES
THE DE-HUM PERCENT
BLOWER RUNS RUNS IN
PART LOAD CFM
Y2 PERCENTAGE TIMES
THE DE-HUM PERCENT
ECM CONTROL BOARD DE-HUMIDIFICATION OPTIONS
SEQUENCE OF OPERATION
COOL TO DE-HUMIDIFY
IMPORTANT:
WHEN HGRH DIP SWITCH IS
SET TO “YES” THE BK LINE
WILL BE ENERGIZED ALL THE
TIME REGARDLESS OF TB1-H
SIGNAL
IMPORTANT:
WHEN HGRH DIP SWITCH IS SET TO
“NO” THE BK LINE WILL BE
ENERGIZED ALL THE TIME AND
ONLY DE-ENERGIZED WHEN TB01-H
SENSES 24 VAC.
MOTOR
RUNS WITH
ANY
SIGNAL
NO
YES
IMPORTANT:
“ADJ +” AND “ADJ – “ , INCREASE
OR DECREASE APROX 15% OF
NOMINAL CFM VALUE.
DELAY A,B,C OR D SELECT CFM
PROFILE FACTORY DEFAUL IS “A”
W1 OR W2
=ON
NO
YES
FAN NOMINAL CFM
START
Fig. 17 -- ECM Sequence of Operation

17
Airflow Selector
The airflow selector (see Fig. 13, items 2 and 3 and Fig. 18) allows
airflow adjustment to meet application requirements and to ease
troubleshooting.
NOTE: Only one switch can be enabled at a time. Refer to Fig. 18
for each airflow setting.
SCFM Selector must remain with only “A” being enabled.
SADJUST Selector can be adjusted to NOM, (+), (--), or TEST.
NOM, (+) and (--) can be adjusted as needed by application. TEST
is used for troubleshooting to override unit airflow to 100%.
CFM PROFILE SELECTOR
PROFILES PROGRAMMED IN THE
MOTOR REFER TO AIRFLOW PROFILE
TABLES IN INSTALLATION MANUAL.
FACTORY DEFAULT IS SET TO “A”.
ALL TABLES REFER TO “A” PROGRAM
ONLY.
AIRFLOW PERCENT SELECTOR
ONLY ONE SWITCH IS TO BE ENABLED
AT A TIME.
PERCENTAGES PROGRAMMED IN THE
MOTOR REFER TO AIRFLOW TABLE IN
INSTALLATION MANUAL.
TYPICALLY, “+” = 15% INCREASE IN
AIRFLOW
A150444
Fig. 18 -- Airflow Selector
CAUTION
!
UNIT DAMAGE AND/OR OPERATION HAZARD
Failure to follow this caution may result in unit damage
and/or improper equipment operation.
Do not set the ADJUST DIP switch 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.
CAUTION
!
UNIT DAMAGE AND/OR OPERATION HAZARD
Failure to follow this caution may result in unit damage
and/or improper equipment operation.
Always disconnect power before changing DIP switch
positions on the interface board and reset the unit
afterward.
Constant Airflow Motor
The Constant Airflow Motor is an Electronic Commutated Motor
(ECM) that provides a constant air flow over a wide range of
external static pressures while optimizing the power consumption
of the motor. This option allows the unit to have different air flow
settings depending on the mode that the unit is operating; i.e
heating, cooling, fan only, hot gas reheat, etc. Refer to the ECM
Interface Board section in this document for more information.
Pump Relay
The factory installed pump relay can be used to energize a supply
pump or solenoid valve when there is a call for compressor
operation. This relay can be used to switch either high or low
voltage power.
Comfort Alert Diagnostics Module (CADM)
The Comfort Alert Diagnostics Module (CADM) is a breakthrough
innovation for troubleshooting heat pump system failures (see Fig.
19).
A14127
Fig. 19 -- Comfort Alert Diagnostics Module (CADM)
By monitoring and analyzing data from the compressor and the
thermostat demand, the module can accurately detect the cause of
electrical and system related failures without any sensors. A
flashing LED indicator communicates the ALERT code and guides
the service technician more quickly and accurately to the root cause
of a problem.
IMPORTANT: This module does not provide safety protection!
The Comfort Alert Diagnostics Module is a monitoring device
only and cannot shut down the compressor directly.
When an abnormal system condition occurs, the CADM displays
the appropriate ALERT and/or TRIP LED. The yellow ALERT
LED will flash a number of times consecutively, pause and then
repeat the process. To identify a Flash Code number, count the
number of consecutive flashes. Every time the module powers up,
the last ALERT Flash Code that occurred prior to shut down is
displayed for one minute.
Comfort Alert Codes
The comfort alert codes are marked on the back of the device for
field service.
GREEN LED -- 24VAC Power
YELLOW LED -- Flash Code
1. Long run time
2. System pressure trip
3. Short cycling
4. Locked rotor
5. Open circuit
6. Open start circuit
7. Open run circuit
8. Welded contactor
9. Low voltage
RED LED (solid) -- Protector open or no compressor power
Reset the codes y breaking 24VAC to the module.

18
FACTORY INSTALLED FEATURES
A number of factory installed options are available on the GT
Series of Heat Pumps. The following details the purpose, function
and components of each option.
Smart Start Assist
The Smart Start Assist (SSA) is designed to reduce the in--rush
draw during single--phase scroll start--up. The kit contains two
main parts (shown in Fig. 20), the mounting plate and the SSA
component. The kit is installed on top of the unit’s electrical box.
The SSA reduces compressor starting currents, limiting the peak
energy demand. SSA has a dedicated algorithm and built--in
current limit settings specifically for scroll compressor starting.
The designed soft start algorithm slowly ramps the in--rush current
which results in the elimination of light flickering, reduction in
voltage disturbances and increased compressor lifetime. The SSA
can lock out the unit and incorporates its own 5 min. time delay,
Refer to Fig. 21, Mode of Operation. This 5 minute anti--cycle
delay that could possibly hold unit off even if the UPM test switch
is activated in attempt to override the UPM 5 min delay.
De--energizing the SSA is the only way to override its built in time
delay (refer to unit wiring diagram).
Mounting Plate
Smart Start
Assist
Optional for
remote alarm
A150464
Fig. 20 -- Smart Start Assist
A14196 / A14199
1. The Smart Start Assist has 2 indication LEDs on board. The green LED
indicates the status fo the on-board power supply while the red LED indi-
cates an alarm condition or the recovery time between starts1
2. Once the mains voltage is present, the green LED will be fully ON. In case
the mains voltage is less than the stated pickup voltage alarm value, the
green LED will be flashing. In case the mains voltage is higher than the
stated pickup voltage and the green LED is flashing, this may indicate that
the on-board power supply is faulty. (Power Supply Alarm)
3. Upon closing K1, the Smart Start Assist will start ramping for duration of
<1 second provided that the minimum time from stop to start is respect-
ed. When opening the K1, the Smart Start Assist will stop without any
ramp down.
4. In case of an under-voltage, the Smart Start Assist will shut down and the
red LED will flash 2 times as long as the under-voltage is present. Once
the mains voltage is restored, the red LED will continue flashing for 5 min-
utes (6 minutes for HP versions). Following these 5 minutes, the Smart
Start Assist will start ramping function in the case k1 is closed. The device
can be reset at any time by removing power on L1-N connection. When
the power is reapplied, the soft starter will start ramping up as soon as K1
is closed provided that the minimum time between starts and the mini-
mumtimefromstoptostartarerespected.
5. If an over--- current (>80A for 1 second) is sensed, the Smart Start Assist
will shut down and the red LED will flash 3 times indicating an over--- cur-
rent situation. This continues for 5 minutes. In the case that the over --- cur-
rent is still present at the second attempt, user intervention is required to
meet the controller by cycling power for the device to operate again as
this implies that there are problems in the system.
6. A detection circuitry provides protection in case of a faulty starting capaci-
tor EMR. In such a situation, the red LED will flash 4 times for 5 minutes.
Smart Start Assist will check the status of the starting capacitor EMR be-
fore attempting a ramping function (in the case K1 is closed). If, at the
second attempt, the starting capacitor EMR is found to be faulty, user in-
tervention is required to reset the controller by cycle power for the device.
7. Inthecaseofincompleterampingofthesoftstarter,theredLEDwillflash
5 times. The flashing will be indicated by the red LED for 5 minutes. If,
after the second attempt, there is another incomplete ramp alarm, user
intervention is required to reset the controller.
8. During recovery from under--- voltage, over --- current and incomplete ramp
alarms, the red LED will flash twice the normal flashing frequency using
the same number of flashes. The figure shows the flashing in case of a
recovery from an under--- voltage alarm.
9. During the recovery time between starts, the Smart Start Assist will be
continuously ON until the necessary recovery time elapses1
10. If supply on Smart Start Assist is removed before the recovery period has
elapsed, when supply is restored, the delay will continue until the remain-
ing recovery time from the last start/stop (before supply removal) is over.
Following this, another start may be attempted. If supply is removed dur-
ing alarm recovery (red LED flashing), when supply is restored, the alarm
will be rest and the Smart Start Assist will only wait for the respective de-
lays between starts and/or stop to start to elapse before attempting an-
other start (assuming K1 is closed).
1- Applicable to HP versions only
Manual resets may be necessary if consecutive flash codes:
2-- Over current
4-- Relay Protection
5-- Incomplete Ramp
Fig. 21 -- Mode of Operation

19
Heat Recovery Package (HRP)
(optional)
The heat recovery package is a factory installed option on GT
series heat pumps. The HRP can be used to heat potable water
during unit operation using waste heat from the compressor
discharge gas. In some cases the HRP can provide most or all of
the hot water requirements for a typical home.
The HRP consists of three major components:
1. Double wall, vented refrigerant to water heat exchanger
2. Circulating pump
3. Control circuit
The heat exchanger is rated for use with potable water and is
acceptable for use as a domestic water heating device in most
building codes.
The pump circulates water between the domestic hot water tank
and HRP heat exchanger in the Heat Pump. The control circuit
ensures that the HRP only operates when there is available heat
from the compressor and when the water is within a safe
temperature range of below 140_F. When the heat pump
compressor operates, the HRP will monitor the temperature of the
discharge gas from the compressor. Once discharge gas is hot
enough to provide useful heat to the domestic water tank, the
circulating pump will be enabled, drawing water from the tank,
through the HRP heat exchanger and then depositing the heated
water back into the tank.
If the water temperature reaches 140_F, the circulating pump is
disabled to prevent over heating of the domestic water. The HRP is
provided with an on/off switch in case the end user desires that the
HRP be inactivated (typically during the winter months when
space heating is most important).
CAUTION
!
UNIT DAMAGE AND/OR OPERATION HAZARD
Failure to follow this caution may result in unit damage
and/or improper equipment operation.
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.
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 flushed 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 HRP water piping.
HRP Water Piping
All hot water piping MUST be a minimum of 3/8” O.D. copper
tube to a maximum distance of 15 feet. For distances beyond 15
feet, but not exceeding 60 feet, use 1/2” copper tube. Separately
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. (See Fig. 22)
Shut-off Ball Valve
Air Bleed Valve
Domestic Hot Water Supply
Water Heater
(w/active elements)
Domestic Cold Water Supply
Water Heater
(no active elements
pre-heat tank)
Cold Water In
HP
Hot Water Out
Shut-off Ball Valve
Air Bleed Valve
Domestic Cold Water Supply
HP
Hot Water Out
Water Heater
(w/active elements)
One Tank System
Two Tank System (preferred)
Package unit shown. GT split unit arrangement similar with different water locations on unit. A150174
Fig. 22 -- HRP Water Piping

20
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 flows 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 HRP 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 thermo-
stat(s) to ensure maximum utilization of heat available from
the refrigeration system and to conserve the most energy.
On tanks with thermostats and both upper and lower ele-
ments, the lower element should be turned down to 100_F,
while the upper element should be adjusted to 120_F. De-
pending upon the specific needs of the customer, you may
need to adjust the upper element differently.
On tanks with a single thermostat, lower the thermostat set-
ting to 120_F or the “LOW” position. After thermostat ad-
justments are completed, replace access cover and restore
electrical or fuel supply to water heater.
IMPORTANT: Copper should be used for piping from HRP to
domestic water tank(s). Use 5/8” (16mm) O.D. copper or
larger. Refer to local codes for hot water piping. Insulate the
water lines between the GHP and the water heater with a
minimum of 3/8” (10mm) closed cell insulation.
Initial Start--Up
CAUTION
!
UNIT DAMAGE AND/OR OPERATION HAZARD
Failure to follow this caution may result in unit damage
and/or improper equipment operation.
Make sure all valves in heat recovery water piping system
are open. NEVER OPERATE HR PUMP DRY.
1. Turn on the heat pump. The HR pump should not run if the
compressor is not running.
2. Turn HR switch to the “ON” position. The pump will oper-
ate if entering water temperature to HR is below 120_F.
3. The temperature difference between the water entering and
leaving the heat recovery should be 5_Fto15_F.
4. 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.
FIELD INSTALLED ACCESSORIES
Auxiliary Heaters
Internally mounted auxiliary heaters are available in 10 Kw, 15 Kw
and 10 Kw sizes. For installation procedures, refer to the
instructions shipped with the heaters. Table 3 lists compatible
heaters with GT units.
Flow Centers and Associated Loop Accessories
A wide variety of flow centers are available for both closed and
open loop installations, along with hose kits, fittings, solenoid
valves, etc. Refer to the instructions shipped with these
components for further details.
Table 3 – Electric Heater Compatibility
Heater
Model
kW
Stages
Btu/h Product Series Compatibility
208V 230V 208V 230V GT024 GT036 GTT048 GT060 GT072
KWAEH0101N10 7.2 9.6 224600 32700 X X X X X
KWAEH0101F15 10.8 14.4 236900 49100 X X X X
KWAEH0101F20 14.4 19.2 249200 63400 X X X
X = Compatible