ClimateMaster GT-PX Indoor Split Series User manual

Table of Contents
Model Nomenclature 3
Safety 4
Storage 5
Pre-Installation 5
Equipment Selection 6
Air Coil Match-ups 6-7
Air Handler Selection 8
Installation 9
Water Connections 10
Ground-Loop Heat Pump Applications 12-14
Ground-Water Heat Pump Applications -
Indoor Compressor Section Only 15
Water Quality Standards 17
Lineset Information 18
Refrigeration Installation 18-25
Hot Water Generator 26-30
Indoor Compressor Section Only 28
Hot Water Generator
Module Refrigeration Installation
Outdoor Compressor Section Only 29-30
Electrical - Line Voltage 31
Electrical - Power Wiring 32
Electrical - HWG Wiring 32
Electrical - Low Voltage Wiring 33-37
Thermostat Wiring 33-37
CXM Controls 38-40
Unit Starting and Operating Conditions 41-42
Unit Start-Up Procedure 43
Unit Operating Conditions 44-45
Preventive Maintenance 46
Troubleshooting 47
CXM Process Flow Chart 48
Functional Troubleshooting 49-50
Performance Troubleshooting 50
Troubleshooting Form 51
Warranty 52
Revision History 54
GT-PX Indoor Split Series (50YDS Models)
GT-PE Outdoor Split Series (50YPS Models)
Installation, Operation and Maintenance Instructions
Residential Split
Geothermal Heat Pumps
97B0048N02
Revised: 6 Dec., 2011

This page was intentionally left blank.

3
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
Model Nomenclature:for Split Series
NOTE: Above model nomenclature is a general reference. Consult individual speciÄcation catalogs
for detailed information.
NOTE: Above model nomenclature is a general reference. Consult individual speciÄcation catalogs
for detailed information.
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8
91011
12
026
Unit Size
038
Air Flow Configuration
C = CXM
Controls
Heat Exchanger Options
Packaging
50
1 2
Prefix
3
YPS = Outdoor Split Residential
Series
3 = 206-230/60/1
Voltage
049
064
C = Copper Coax
N = Cupro-Nickel Coax
1 = Single Pack, Domestic
Revision Level
1 = Current Revision
N = NOT APPLICABLE
Indoor Splits
Outdoor Splits

ѥWARNING! ѥ
ѥWARNING! ѥ
ѥCAUTION! ѥ
Safety
WARNING! To avoid the release of refrigerant into the
atmosphere, the refrigerant circuit of this unit must be
serviced only by technicians who meet local, state, and
federal pro¿ciency requirements.
CAUTION! To avoid equipment damage, DO NOT use
these units as a source of heating or cooling during the
construction process. The mechanical components and
¿lters will quickly become clogged with construction dirt
and debris, which may cause system damage.
WARNING! All refrigerant discharged from this unit must
be recovered WITHOUT EXCEPTION. Technicians must
follow industry accepted guidelines and all local, state,
and federal statutes for the recovery and disposal of
refrigerants. If a compressor is removed from this unit,
refrigerant circuit oil will remain in the compressor. To
avoid leakage of compressor oil, refrigerant lines of the
compressor must be sealed after it is removed.
Safety
Warnings, cautions and notices appear throughout this
manual. Read these items carefully before attempting any
installation, service, or troubleshooting of the equipment.
DANGER: Indicates an immediate hazardous situation, which
if not avoided will result in death or serious injury. DANGER
labels on unit access panels must be observed.
WARNING: Indicates a potentially hazardous situation, which
if not avoided could result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation or an
unsafe practice, which if not avoided could result in minor or
moderate injury or product or property damage.
NOTICE: Noti¿cation of installation, operation or maintenance
information, which is important, but which is not hazard-
related.
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
4

General Information
CAUTION! DO NOT store or install units in corrosive
environments or in locations subject to temperature or
humidity extremes (e.g., attics, garages, rooftops, etc.).
Corrosive conditions and high temperature or humidity can
signi¿cantly reduce performance, reliability, and service
life. Always move and store units in an upright position.
Tilting units on their sides may cause equipment damage.
ѥCAUTION! ѥ
ѥCAUTION! ѥ
Stora
g
e
P
re-
I
n
s
tallat
ion
CAUTION! 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, safety glasses and gloves when
handling parts and servicing heat pumps.
Inspection
Upon receipt of the equipment, carefully check the shipment
against the bill of lading. Make sure all units have been
received. Inspect the packaging of each unit, and inspect each
unit for damage. Insure that the carrier makes proper notation
of any shortages or damage on all copies of the freight bill
and completes a common carrier inspection report. Concealed
damage not discovered during unloading must be reported
to the carrier within 15 days of receipt of shipment. If not ¿led
within 15 days, the freight company can deny the claim without
recourse. Note: It is the responsibility of the purchaser to ¿le
all necessary claims with the carrier. Notify your equipment
supplier of all damage within ¿fteen (15) days of shipment.
Storage
Equipment should be stored in its original packaging in a
clean, dry area. Store units in an upright position at all times.
Stack units a maximum of 3 units high.
Unit Protection
Cover units on the job site with either the original packaging
or an equivalent protective covering. Cap the open ends of
pipes stored on the job site. In areas where painting, plastering,
and/or spraying has not been completed, all due precautions
must be taken to avoid physical damage to the units and
contamination by foreign material. Physical damage and
contamination may prevent proper start-up and may result in
costly equipment clean-up.
Examine all pipes, ¿ttings, and valves before installing any of
the system components. Remove any dirt or debris found in
or on these components.
Pre-Installation
Installation, Operation, and Maintenance instructions are
provided with each unit. Horizontal equipment is designed for
installation above false ceiling or in a ceiling plenum. Other
unit con¿gurations are typically installed in a mechanical
room. The installation site chosen should include adequate
service clearance around the unit. Before unit start-up,
read all manuals and become familiar with the unit and its
operation. Thoroughly check the system before operation.
Prepare units for installation as follows:
1. Compare the electrical data on the unit nameplate with
ordering and shipping information to verify that the
correct unit has been shipped.
2. Keep the cabinet covered with the original packaging
until installation is complete and all plastering, painting,
etc. is ¿nished.
3. Verify refrigerant tubing is free of kinks or dents and that
it does not touch other unit components.
4. Inspect all electrical connections. Connections must be
clean and tight at the terminals.
5. Locate and verify any hot water generator (HWG) or
other accessory kit located in the compressor section.
5
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011

Equipment Selection
A
ir
C
oil Match-u
ps
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
6
The installation of geothermal heat pump units and all
associated components, parts, and accessories which make
up the installation shall be in accordance with the regulations
of ALL authorities having jurisdiction and MUST conform to
all applicable codes. It is the responsibility of the installing
contractor to determine and comply with ALL applicable
codes and regulations.
General
Proper indoor coil selection is critical to system efÄciency.
Using an older-model coil can affect efÄciency and may
not provide the customer with rated or advertised EER
and COP. Coil design and technology have dramatically
improved operating efÄciency and capacity in the past 20
years. Homeowners using an older coil are not reaping these
cost savings and comfort beneÄts. NEVER MATCH AN R-22
INDOOR COIL WITH A PURON®COMPRESSOR SECTION.
Newer indoor coils have a larger surface area, enhanced Än
design, and grooved tubing. These features provide a larger
area for heat transfer, improving efÄciency and expanding
capacity. Typical older coils may only have one-third to one-
half the face area of these redesigned coils.
Indoor Coil Selection - GT-PX & GT-PE (50YDS & YPS)
Split system heat pumps are rated in the AHRI directory with
a speciÄc indoor coil match. GT-PX and GT-PE models are
rated with Carrier/Bryant FV4 or FE4 series variable speed
air handlers as shown in Table 1a. Other brands of air
handlers may attain the same AHRI ratings providing that the
speciÄcations meet or exceed those listed in Table 1a AND
Table 1b. An ECM motor and TXV is required. Cap tubes
and Äxed oriÄces are not acceptable. PSC fans may be
used if matched to Table 1c, but will not meet AHRI ratings.
If using PSC fan, compressor section must be operated
as a single stage unit (i.e. wired for either 1st stage or 2nd
stage). Without the ability to vary the airÅow, supply air
temperatures may not be acceptable if the compressor is
allowed to change stages when used with a PSC fan motor.
Table 1a: GT-PX & GT-PE Carrier/Bryant Air Handler Matches for AHRI Ratings
Compressor Section 026 038 049 064
Air Handler
Model FV4 003 005 006 006
Refrigerant Puron®
Metering Device TXV (required)
Air Coil
Type
Rows - Fins/in.
Face Area (sq. ft.)
Slope
3 - 14.5
3.46
A
3 - 14.5
5.93
A
3 - 14.5
7.42
A
3 - 14.5
7.42
Cabinet ConÄgura-
tion
UpÅow/DownÅow/Horizontal (Multipoise)
ECM Settings for
AHRI Ratings
(FV4 Fan Coil)
AC/HP size: 036
System Type:
Comfort AC/HP
CFM Adjust: Nom
AC/HP size: 036
System Type:
HP-EfÄc AC/HP
CFM Adjust: High
AC/HP size: 048
System Type:
Comfort AC/HP
CFM Adjust: High
AC/HP size: 060
System Type:
Comfort AC/HP
CFM Adjust: High
Fan Motor Type - HP ECM - 1/2 ECM - 1/2 ECM - 3/4 ECM - 3/4

Equipment Selection
A
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C
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7
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
Table 1b: GT-PX & GT-PE Air Handler Characteristics for Brands other than Above Models
Model* Nominal
Tons* Evaporator Temp (ºF) CFM Capacity (MBtuh)**
026 - Part Load 1.5 50 530 19.2 - 22.4
026 - Full Load 2.0 52 880 24.2 - 28.2
038 - Part Load 2.5 51 700 25.2 - 29.2
038 - Full Load 3.0 50 1200 34.5 - 40.1
049 - Part Load 3.5 47 1000 34.3 - 39.9
049 - Full Load 4.0 48 1650 46.3 - 53.8
064 - Full Load 5.0 48 1850 54.5 - 63.3
* Nominal tons are at AHRI/ISO 13256-1 GLHP conditions. Two-stage units may be operated in single-stage mode if desired, where smaller
capacity is required. For example, a model 026 may be used as a 1-1/2 ton unit if “locked” into 1st stage operation only. If PSC fan is
used, unit must be “locked” into either 1st or 2nd stage. An ECM fan is required for two-stage operation and for AHRI ratings. Size air
handler for “Full Load” if operating in two-stage mode.
**When selecting an air handler based upon the above conditions, choose entering WB temperature of 67ºF. Use evaporator temperature,
CFM and capacity requirements as listed above. The air handler capacity must be at least at the minimum capacity shown in the table in
order for the AHRI rating condition to be valid. See Figure 1 for an example selection.
Note: Due to limitations in combining a geothermal split unit with a Bryant Evolution fan coil, furnace and InÄnity
control, or a Bryant Evolution fan coil, furnace and Evolution controller, refer to Service Bulletins SMB 10-0007 and
DSB 10-0007.

Air Handler Selection Example
Figure 1 shows a typical performance table for a heat pump
air handler. Suppose the evaporator temperature required
is 50ºF, the capacity required is 35,000 Btuh and the airÅow
required is 1,200 CFM. Each evaporator temperature
listed in the table shows three wet bulb temperatures. As
recommended in the table notes above, select the 67ºF
WB column. At 1,200 CFM, the model 003 capacity is 36
MBtuh, which is higher than the minimum capacity required
of 35,000 Btuh. In this example, model 003 would be the
appropriate match.
Figure 1: Selecting Air Handler
Equipment Selection
Evaporator Air - Entering Wet-Bulb Temperature (°F)
35 40 45 50 55
Coil Refrigerant Temperatre (°F)*
72 67 62 72 67 62 72 67 62 72 67 62 72 67 62
800 59 48 38 53 42 32 46 35 24 39 27 20 30 18 16
0.20 28 29 31 25 27 28 22 23 24 19 20 20 16 16 16
1000 68 56 45 61 49 37 54 41 29 45 32 25 35 22 20
0.22 32 34 37 29 31 33 26 28 28 23 24 25 19 20 20
1200 75 62 49 68 54 42 60 45 34 50 36 29 40 25 23
0.25 35 39 42 32 36 28 29 32 33 26 28 29 22 23 23
1400 80 67 54 73 59 46 64 49 38 54 39 32 43 28 27
0.27 28 43 47 35 39 43 32 36 37 28 32 32 24 26 27
750 61 49 39 55 43 33 48 37 27 41 29 20 33 21 17
0.04 27 27 28 24 25 25 21 22 22 18 18 18 15 15 15
950 74 60 48 67 53 40 59 45 33 50 35 25 39 24 21
0.06 32 34 35 29 30 31 25 26 27 22 23 23 18 18 19
1150 89 72 57 79 63 48 69 52 38 58 41 31 44 29 25
0.07 37 39 41 33 35 36 29 31 32 25 25 27 20 22 22
1500 103 84 66 92 73 56 81 61 46 67 48 39 52 34 31
0.10 43 46 49 38 41 44 34 37 39 29 32 33 25 27 27
1700 110 89 71 99 78 60 86 65 49 72 51 42 56 37 35
0.11 45 50 53 41 45 48 36 39 42 31 34 36 27 29 30
1050 77 62 50 69 55 43 61 47 32 52 38 27 41 27 22
0.01 34 36 37 31 32 33 27 28 29 23 25 24 20 20 20
1300 100 82 65 90 71 55 79 60 45 66 47 37 49 32 27
0.02 42 45 47 37 40 42 33 35 37 29 31 32 23 25 24
1750 117 96 77 106 84 65 93 71 53 78 56 46 60 40 34
0.04 48 53 57 44 48 52 39 43 46 34 38 39 29 31 31
2050 126 103 83 114 91 71 99 76 59 84 60 50 65 44 39
0.05 52 58 63 48 53 57 43 47 51 37 42 43 33 35 35
2300 132 108 87 119 95 75 105 80 63 88 63 54 70 47 42
0.06 55 62 58 50 57 61 45 51 54 40 45 46 35 39 38
003
005
006
Evaporator
Air CFM
BF
Unit
Size
= Gross cooling capacity (MBtuh)
= Sensible heat capacity (MBtuh)
BF = Bypass Factor
A
ir Handler
S
ele
c
ti
on
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
8

Installation
9
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
The installation of water source heat pump units and all
associated components, parts and accessories which make
up the installation shall be in accordance with the regulations
of ALL authorities having jurisdiction and MUST conform to
all applicable codes. It is the responsibility of the installing
contractor to determine and comply with ALL applicable
codes and regulations.
Removing Existing Condensing Unit (Where Applicable)
1. Pump down condensing unit. Close the liquid line
service valve of existing condensing unit and start
compressor to pump refrigerant back into compressor
section. Then, close suction service valve while
compressor is still running to trap refrigerant in outdoor
section. Immediately kill power to the condensing unit.
2. Disconnect power and low voltage and remove old
condensing unit. Cut or unbraze line set from unit.
Remove condensing unit.
3. If condensing unit is not operational or will not pump
down, refrigerant should be recovered using appropriate
equipment.
4. Replace line set, especially if upgrading system from
R-22 to Puron®refrigerant. If line set cannot be replaced,
it must be thoroughly Åushed before installing new
compressor section. Puron®compressors use POE
oil instead of mineral oil (R-22 systems). Mineral oil is
not compatible with POE oil, and could cause system
damage if not completely Åushed from the line set.
“Indoor” Compressor Section Location
Both “indoor” and “outdoor” versions of the geothermal
split system compressor section are available. “Indoor”
version is not designed for outdoor installation. Locate the
unit in an INDOOR area that allows enough space for service
personnel to perform typical maintenance or repairs without
removing unit. Units are typically installed in a mechanical
room or closet. Never install units in areas subject to freezing
or where humidity levels could cause cabinet condensation
(such as unconditioned spaces subject to 100% outside air).
Consideration should be given to access for easy removal
of service access panels. Provide sufÄcient room to make
water, electrical, and line set connections.
Any access panel screws that would be difÄcult to remove
after the unit is installed should be removed prior to setting
the unit. Refer to Figure 2 for an illustration of a typical
installation. Refer to “Physical Dimensions” section for
dimensional data. Conform to the following guidelines when
selecting unit location:
1. Install the unit on a piece of rubber, neoprene or other
mounting pad material for sound isolation. The pad should
be at least 3/8” [10mm] to 1/2” [13mm] in thickness.
Extend the pad beyond all four edges of the unit.
2. Provide adequate clearance for maintenance and
service. Do not block access panels with piping, conduit
or other materials.
3. Provide access for servicing the compressor and coils
without removing the unit.
4. Provide an unobstructed path to the unit within the
closet or mechanical room. Space should be sufÄcient to
allow removal of the unit, if necessary.
5. Provide access to water valves and Ättings and
screwdriver access to the unit side panels and all
electrical connections.
“Outdoor” Compressor Section Location
Locate the unit in an outdoor area that allows easy loop
and lineset access and also has enough space for service
personnel to perform typical maintenance or repairs. The
“outdoor” compressor section is usually installed on a
condenser pad directly outside the lineset access into the
building. The loop access end should be located away from
the building. Conform to the following guidelines when
selecting unit location:
1. Provide adequate access for loop trench excavation.
2. Locate unit directly outside lineset penetration if
possible. Utilize existing condensor pad where
possible.
3. Provide access for servicing and maintenance.
“Outdoor” compressor section may be mounted on a
vibration isolation pad with loop access hole as shown
in Figure 3. When mounting on an existing concrete
condenser pad, 3” [76 mm] holes should be bored through
the pad to accommodate the pipe (1-¼” - 32mm) and
insulation (½” [13mm] wall thickness). Figure 3 illustrates
location and dimensions of the holes required.
Air Handler Installation
This manual speciÄcally addresses the compressor section
of the system. Air handler location and installation should
be according to the instructions provided with the air
handling unit.

Installation
Gasket
Swivel Nut
Stainless steel
snap ring
Brass Adaptor
Hand Tighten
Only!
Do Not
Overtighten!
The female locking ring is threaded onto the pipe threads
which holds the male pipe end against the rubber gasket,
and seals the joint. HAND TIGHTEN ONLY! DO NOT
OVERTIGHTEN!
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External Flow Controller Mounting
The Flow Controller can be mounted beside the indoor unit
as shown in Figure 7. Review the Flow Controller installation
manual for more details.
Water Connections-Residential (Distributor) Models
Residential models utilize swivel piping Ättings for water
connections that are rated for 450 psi (3101 kPa) operating
pressure. The connections have a rubber gasket seal
similar to a garden hose gasket, which when mated to the
Åush end of most 1” threaded male pipe Ättings provides
a leak-free seal without the need for thread sealing tape or
joint compound. Insure that the rubber seal is in the swivel
connector prior to attempting any connection (rubber seals
are shipped attached to the swivel connector). DO NOT
OVER TIGHTEN or leaks may occur.
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
10
Figure 2: GT-PX Installation
Figure 4: Water Connections (50YDS Models)
Figure 3: GT-PE Installation
(50YDS Models)

Installation
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0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
0 5 10 15 20 25 30 35
Head (ft)
GPM
Speed 1
Speed 2
Speed 3
ѥCAUTION! ѥ
CAUTION! Using check valves in GT-PE (50YPS) units
will prevent thermo siphoning of the ground loop. If the unit
loses power this may cause the coaxial heat exchanger
to freeze if the ambient temperature falls below the freeze
point of the ground loop Àuid.
11
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
Internal Flow Controller Connections (50YPS Series)
The 50YPS series outdoor compressor section includes a
factory built-in circulator, as shown in Ägure 3.
The circulator in the 50YPS unit is three speed (shipped on
high speed). Lower circulator speeds may be chosen where
appropriate to lower pumping power and match the Åow rate
to the unit’s requirements. The pump speed selection switch
is located on the pump’s electrical box.
50YPS026 and 038 units come standard with one
circulator. 50YPS049 and 064 units come standard with
two circulators, piped in series for greater Åow and head
capabilities.
50YPS026 and 038 units are shipped with ¾” stainless
steel braided hoses connected to unit piping. These hoses
terminate in swivel connections.
50YPS049 and 064 units are shipped with 1” stainless
steel braided hoses connected to unit piping. These hoses
terminate in swivel connections.
Figure 5: Hose Connections (GT-PE Series)
CAUTION! To avoid equipment damage, DO NOT allow
system water pressure to exceed 100 psi when using
the GT-PE Outdoor Compressor Section. The expansion
tank in the GT-PE has a maximum working water
pressure of 100 psi. Any pressure in excess of 100 psi
may damage the expansion tank.
Figure 6: Pump Curves for GT-PE internal pump(s) - Single Pump
Double Pump Table on following page

Ground-Loop Heat Pump Applications
ѥCAUTION! ѥPre-Installation
Prior to installation, locate and mark all existing underground
utilities, piping, etc. Install loops for new construction before
sidewalks, patios, driveways, and other construction has
begun. During construction, accurately mark all ground loop
piping on the plot plan as an aid in avoiding potential future
damage to the installation.
Piping Installation
The typical closed loop ground source system is shown in
Figure 7. All earth loop piping materials should be limited
to polyethylene fusion only for in-ground sections of the
loop. Galvanized or steel Ättings should not be used at any
time due to their tendency to corrode. All plastic to metal
threaded Ättings should be avoided due to their potential to
leak in earth coupled applications. A Åanged Ätting should
be substituted. P/T plugs should be used so that Åow
can be measured using the pressure drop of the unit heat
exchanger.
Installation
0
10
20
30
40
50
60
70
0 5 10 15 20 25 30
Head (ft)
GPM
Speed 1
Speed 2
Speed 3
CAUTION! The following instructions represent industry
accepted installation practices for closed loop earth
coupled heat pump systems. Instructions are provided
to assist the contractor in installing trouble free ground
loops. These instructions are recommendations only.
State/provincial and local codes MUST be followed and
installation MUST conform toALL applicable codes. It is
the responsibility of the installing contractor to determine
and comply with ALL applicable codes and regulations.
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
12
Figure 6: Pump Curves for GT-PE internal pump(s) - Double Pump

Earth loop temperatures can range between 25 and
110°F [-4 to 43°C]. Flow rates between 2.25 and 3 gpm
per ton [2.41 to 3.23 l/m per kW] of cooling capacity is
recommended in these applications.
Test individual horizontal loop circuits before backÄlling.
Test vertical U-bends and pond loop assemblies prior to
installation. Pressures of at least 100 psi [689 kPa] should be
used when testing. Do not exceed the pipe pressure rating.
Test entire system when all loops are assembled.
Flushing the Earth Loop
Once piping is completed between the unit, Flow Controller
and the ground loop (Figure 7), the loop is ready for Änal
purging and charging. A Åush cart with at least a 1.5 hp
[1.1 kW] pump is required to achieve enough Åuid velocity
in the loop piping system to purge air and dirt particles. An
antifreeze solution is used in most areas to prevent freezing.
All air and debris must be removed from the earth loop
piping before operation. Flush the loop with a high volume
of water at a minimum velocity of 2 fps (0.6 m/s) in all piping.
The steps below must be followed for proper Åushing.
1. Fill loop with water from a garden hose through the Åush
cart before using the Åush cart pump to insure an even
Äll.
2. Once full, the Åushing process can begin. Do not allow
the water level in the Åush cart tank to drop below the
pump inlet line to avoid air being pumped back out to
the earth loop.
3. Try to maintain a Åuid level in the tank above the return
tee so that air cannot be continuously mixed back into
the Åuid. Surges of 50 psi (345 kPa) can be used to help
purge air pockets by simply shutting off the return valve
going into the Åush cart reservoir. This “dead heads”
the pump to 50 psi (345 kPa). To purge, dead head the
pump until maximum pumping pressure is reached.
Open the return valve and a pressure surge will be sent
through the loop to help purge air pockets from the
piping system.
4. Notice the drop in Åuid level in the Åush cart tank when
the return valve is shut off. If air is adequately purged
from the system, the level will drop only 1-2 inches (2.5
- 5 cm) in a 10” (25 cm) diameter PVC Åush tank (about a
half gallon [2.3 liters]), since liquids are incompressible. If
the level drops more than this, Åushing should continue
since air is still being compressed in the loop Åuid.
Perform the “dead head” procedure a number of times.
Note: This Åuid level drop is your only indication of air in
the loop.
Antifreeze may be added before, during or after the Åushing
procedure. However, depending upon which time is chosen,
antifreeze could be wasted when emptying the Åush cart
tank. See antifreeze section for more details.
Loop static pressure will Åuctuate with the seasons.
Pressures will be higher in the winter months than during
the cooling season. This Åuctuation is normal and should
be considered when charging the system initially. Run the
unit in either heating or cooling for a number of minutes to
condition the loop to a homogenous temperature. This is
a good time for tool cleanup, piping insulation, etc. Then,
perform Änal Åush and pressurize the loop to a static
pressure of 50-75 psi [345-517 kPa] (winter) or 35-40 psi
[241-276 kPa] (summer). After pressurization, be sure to
loosen the plug at the end of the Grundfos loop pump
motor(s) to allow trapped air to be discharged and to insure
the motor housing has been Åooded. This is not required
for Taco circulators. Insure that the Flow Controller provides
adequate Åow through the unit by checking pressure drop
across the heat exchanger and compare to the pressure
drop tables at the back of the manual.
Ground-Loop Heat Pump Applications
ѥCAUTION! ѥ
Antifreeze
In areas where minimum entering loop temperatures drop
below 40°F [5°C] or where piping will be routed through
areas subject to freezing, antifreeze is required. Alcohols
and glycols are commonly used as antifreeze; however your
local sales manager should be consulted for the antifreeze
best suited to your area. Low temperature protection
should be maintained to 15°F [9°C] below the lowest
expected entering loop temperature. For example, if 30°F
[-1°C] is the minimum expected entering loop temperature,
the leaving loop temperature would be 25 to 22°F [-4 to
-6°C] and low temperature protection should be at 15°F
[-10°C]. Calculation is as follows:
30°F - 15°F = 15°F [-1°C - 9°C = -10°C].
All alcohols should be premixed and pumped from a
reservoir outside of the building when possible or introduced
under the water level to prevent fumes. Calculate the
total volume of Åuid in the piping system. Then use the
percentage by volume shown in Table 3 for the amount
of antifreeze needed. Antifreeze concentration should be
checked from a well mixed sample using a hydrometer to
measure speciÄc gravity.
Low Water Temperature Cutout Setting - CXM Control
When antifreeze is selected, the FP1 jumper (JW3) should
be clipped to select the low temperature (antifreeze 10°F
[-12.2°C]) set point and avoid nuisance faults (see “Low
Water Temperature Cutout Selection” in this manual). Note:
Low water temperature operation requires extended range
equipment.
13
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
CAUTION! To avoid equipment damage, DO NOT allow
system water pressure to exceed 100 psi when using
the GT-PE Outdoor Compressor Section. The expansion
tank in the GT-PE has a maximum working water
pressure of 100 psi. Any pressure in excess of 100 psi
may damage the expansion tank.

Table 3: Antifreeze Percentages by Volume
Table 2: Approximate Fluid Volume (U.S. gal. [L]) per
100' of Pipe
Ground-Loop Heat Pump Applications
Air Pad or
Extruded
polystyrene
insulation board
P/T Plugs
Insulated
Hose Kit
Flow
Controller
To Loop
Unit Power
Disconnect
AH & Thermostat
Wiring
Figure 7: Loop Connection (Indoor
Compressor Section)
Type Minimum Temperature for Low Temperature Protection
10°F [-12.2°C] 15°F [-9.4°C] 20°F [-6.7°C] 25°F [-3.9°C]
Methanol
100% USP food grade Propylene Glycol
Ethanol*
25%
38%
29%
21%
25%
25%
16%
22%
20%
10%
15%
14%
* Must not be denatured with any petroleum based product
Fluid Volume (gal [liters] per 100’ [30 meters) Pipe)
Pipe Size Volume (gal) [liters]
Copper
1” 4.1 [15.3]
1.25” 6.4 [23.8]
2.5” 9.2 [34.3]
Rubber Hose 1” 3.9 [14.6]
Polyethylene
3/4” IPS SDR11 2.8 [10.4]
1” iPS SDR11 4.5 [16.7]
1.25” IPS SDR11 8.0 [29.8]
1.5” IPS SDR11 10.9 [40.7]
2” IPS SDR11 18.0 [67.0]
1.25” IPS SCH40 8.3 [30.9]
1.5” IPS SCH40 10.9 [40.7]
2” IPS SCH40 17.0 [63.4]
Unit Heat Exchanger Typical 1.0 [3.8]
Flush Cart Tank 10” Dia x 3ft tall
[254mm x 91.4cm tall] 10 [37.9]
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
14

Ground-Water Heat Pump Applications -
“Indoor”Compressor Section Only
Open Loop - Ground Water Systems
Typical open loop piping is shown in Figure 8. Shut off valves
should be included for ease of servicing. Boiler drains or other
valves should be “tee’d” into the lines to allow acid Åushing
of the heat exchanger. Shut off valves should be positioned
to allow Åow through the coax via the boiler drains without
allowing Åow into the piping system. P/T plugs should be
used so that pressure drop and temperature can be measured.
Piping materials should be limited to copper or PVC SCH80.
Note: Due to the pressure and temperature extremes, PVC
SCH40 is not recommended.
Water quantity should be plentiful and of good quality.
Consult Table 4 for water quality guidelines. The unit can
be ordered with either a copper or cupro-nickel water
heat exchanger. Consult Table 4 for recommendations.
Copper is recommended for closed loop systems and open
loop ground water systems that are not high in mineral
content or corrosiveness. In conditions anticipating heavy
scale formation or in brackish water, a cupro-nickel heat
exchanger is recommended. In ground water situations
where scaling could be heavy or where biological growth
such as iron bacteria will be present, an open loop system
is not recommended. Heat exchanger coils may over time
lose heat exchange capabilities due to build up of mineral
deposits. Heat exchangers must only be serviced by a
qualiÄed technician, as acid and special pumping equipment
is required. Desuperheater coils can likewise become scaled
and possibly plugged. In areas with extremely hard water,
the owner should be informed that the heat exchanger
may require occasional acid Åushing. In some cases, the
desuperheater option should not be recommended due to
hard water conditions and additional maintenance required.
Water Quality Standards
Table 4 should be consulted for water quality requirements.
Scaling potential should be assessed using the pH/Calcium
hardness method. If the pH <7.5 and the Calcium hardness
is less than 100 ppm, scaling potential is low. If this method
yields numbers out of range of those listed, the Ryznar
Stability and Langelier Saturation indecies should be
calculated. Use the appropriate scaling surface temperature
for the application, 150°F [66°C] for direct use (well water/
open loop) and DHW (desuperheater); 90°F [32°F] for
indirect use. A monitoring plan should be implemented in
these probable scaling situations. Other water quality issues
such as iron fouling, corrosion prevention and erosion and
clogging should be referenced in Table 4.
Expansion Tank and Pump
Use a closed, bladder-type expansion tank to minimize
mineral formation due to air exposure. The expansion tank
should be sized to provide at least one minute continuous
run time of the pump using its drawdown capacity rating to
prevent pump short cycling. Discharge water from the unit
is not contaminated in any manner and can be disposed
of in various ways, depending on local building codes (e.g.
recharge well, storm sewer, drain Äeld, adjacent stream
or pond, etc.). Most local codes forbid the use of sanitary
sewer for disposal. Consult your local building and zoning
department to assure compliance in your area.
The pump should be sized to handle the home’s domestic
water load (typically 5-9 gpm [23-41 l/m]) plus the Åow rate
required for the heat pump. Pump sizing and expansion
tank must be chosen as complimentary items. For example,
an expansion tank that is too small can causing premature
pump failure due to short cycling. Variable speed pumping
applications should be considered for the inherent energy
savings and smaller expansion tank requirements.
Water Control Valve
Note the placement of the water control valve in Ägure 8.
Always maintain water pressure in the heat exchanger by
placing the water control valve(s) on the discharge line
to prevent mineral precipitation during the off-cycle. Pilot
operated slow closing valves are recommended to reduce
water hammer. If water hammer persists, a mini-expansion
tank can be mounted on the piping to help absorb the
excess hammer shock. Insure that the total ‘VA’ draw of the
valve can be supplied by the unit transformer. For instance,
a slow closing valve can draw up to 35VA. This can overload
smaller 40 or 50 VA transformers depending on the other
controls in the circuit. A typical pilot operated solenoid valve
draws approximately 15VA (see Figure 24). Note the special
wiring diagrams for slow closing valves (Figures 25 & 26).
Flow Regulation
Flow regulation can be accomplished by two methods. One
method of Åow regulation involves simply adjusting the ball
valve or water control valve on the discharge line. Measure
the pressure drop through the unit heat exchanger, and
determine Åow rate from Table 14. Since the pressure is
constantly varying, two pressure gauges may be needed.
Adjust the valve until the desired Åow of 1.5 to 2 gpm per
ton [2.0 to 2.6 l/m per kW] is achieved. A second method
of Åow control requires a Åow control device mounted on
the outlet of the water control valve. The device is typically
a brass Ätting with an oriÄce of rubber or plastic material
that is designed to allow a speciÄed Åow rate. On occasion,
Åow control devices may produce velocity noise that can be
reduced by applying some back pressure from the ball valve
located on the discharge line. Slightly closing the valve will
spread the pressure drop over both devices, lessening the
velocity noise. NOTE: When EWT is below 50°F [10°C], a
minimum of 2 gpm per ton (2.6 l/m per kW) is required.
ѥCAUTION! ѥ
15
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
CAUTION! To avoid equipment damage, DO NOT allow
system water pressure to exceed 100 psi when using
the GT-PE Outdoor Compressor Section. The expansion
tank in the GT-PE has a maximum working water
pressure of 100 psi. Any pressure in excess of 100 psi
may damage the expansion tank.

Water Coil Low Temperature Limit Setting
For all open loop systems the 30°F [-1.1°C] FP1 setting
(factory setting-water) should be used to avoid freeze damage
to the unit. See “Low Water Temperature Cutout Selection” in
this manual for details on the low limit setting.
Figure 8: Water Well Connections
Ground-Water Heat Pump Applications
Pressure
Ta n k
Shut-Off
Valve
Boiler
Drains
Flow
Regulator
Water In
Water Out
Water
Control
Valve
Optional
Filter
P/T Plugs
ѥCAUTION! ѥ
ѥCAUTION! ѥ
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
16
CAUTION! Many units are installed with a factory or ¿eld
supplied manual or electric shut-off valve. DAMAGE WILL
OCCUR if shut-off valve is closed during unit operation.A
high pressure switch must be installed on the heat pump
side of any ¿eld provided shut-off valves and connected to
the heat pump controls in series with the built-in refrigerant
circuit high pressure switch to disable compressor
operation if water pressure exceeds pressure switch
setting. The ¿eld installed high pressure switch shall have
a cut-out pressure of 300 psig and a cut-in pressure of
250 psig. This pressure switch can be ordered with a 1/4”
internal Àare connection as part number 39B0005N02.
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with the equipment.

Water Quality
Parameter HX Material Closed Recirculating Open Loop and Recirculating Well
Scaling Potential - Primary Measurement
pH/Calcium Hardness All -pH < 7.5 and Ca Hardness <100ppm
Method
Index Limits for Probable Scaling Situations - (Operation outside these limits is not recommended)
Ryznar All -6.0-7.5
Stability Index If >7.5 minimize steel pipe use.
Langelier All --0.5 to +0.5
Saturation Index If <-0.5 minimize steel pipe use. Based upon 66°C HWG and
Direct well, 29°C Indirect Well HX
Iron Fouling
Iron Fe 2+ (Ferrous) All -<0.2 ppm (Ferrous)
(Bacterial Iron potential) 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 6 - 8.5
Monitor/treat as
needed Minimize steel pipe below 7 and no open tanks with pH <8
Hydrogen Sulfide (H2S) All - <0.5 ppm
At H2S>0.2 ppm, avoid use of copper and copper nickel piping or HX's.
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
Maximum Allowable at maximum water temperature.
Chloride Levels
10$C24$C38
C
Copper
Cupronickel -<20ppm NR NR
-<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 micron [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: Rev.: 4/6/2011
15Application not recommended.
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&ORVHG5HFLUFXODWLQJV\VWHPLVLGHQWLILHGE\Dclosed pressurized piping system.
5HFLUFXODWLQJRSHQZHOOVVKRXOGREVHUYHWKHRSHQUHFLUFXODWLQJGHVLJQFRQVLGHUDWLRQV
Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below
Scaling indexes should be calculated at 66°C for direct use and HWG applications, and at 32°C for indirect HX use.
A monitoring plan should be implemented.
Table 4: Water Quality Standards
Water Quality Standards
17
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011

Refrigeration Installation
ѥCAUTION! ѥ
CAUTION! Installation of a factory supplied liquid line
bi-directional Älter drier is required. Never install a suction
line Älter in the liquid line.
ѥCAUTION! ѥ
Table 5: Lineset Diameters and Charge Information
Line Set Installation
Figures 11a and 11b illustrate typical installations of a
compressor section matched to either an air handler (fan coil) or
add-on furnace coil. Table 5 shows typical line-set diameters at
various lengths. Lineset lengths should be kept to a minimum
and should always be installed with care to avoid kinking. Line
sets over 60 feet [18 meters] long are not recommended due to
potential oil transport problems and excessive pressure drop. If
the line set is kinked or distorted, and it cannot be formed back
into its original shape, the damaged portion of the line should
be replaced. A restricted line set will effect the performance of
the system.
Split units are shipped with a Älter drier (loose) inside the
cabinet that must be installed in the liquid line at the line set.
All brazing should be performed using nitrogen circulating
at 2-3 psi [13.8-20.7 kPa] to prevent oxidation inside the
tubing. All linesets should be insulated with a minimum of
1/2” [13mm] thick closed cell insulation. Liquid lines should
be insulated for sound control purposes. All insulation
tubing should be sealed using a UV resistant paint or
covering to prevent deterioration from sunlight.
When passing refrigerant lines through a wall, seal
opening with silicon-based caulk. Avoid direct contact
with water pipes, duct work, Åoor joists, wall studs,
Åoors or other structural components that could transmit
compressor vibration. Do not suspend refrigerant tubing
from joists with rigid straps. Do not attach line set to the
wall. When necessary, use hanger straps with isolation
sleeves to minimize transmission of line set vibration to
the structure.
Installing the Lineset at the Compressor Section
Braze the line set to the service valve stubs as shown in Figure
9. Remove the schraeder cores and heat trap the valves to
avoid overheating and damage. On installations with long line
sets, copper adapters may be needed to connect the larger
diameter tube to the stubs. Nitrogen should be circulated
through the system at 2-3 psi [13.8-20.7 kPa] to prevent
oxidation contamination. Use a low silver phos-copper braze
alloy on all brazed connections. Compressor section is
shipped with a factory charge. Therefore, service valves
should not be opened until the line set has been leak
tested, purged and evacuated. See “Charging the System.”
Installing the Indoor Coil and Lineset
Figure 10 shows the installation of the lineset and TXV to a
typical indoor coil. An indoor coil or air handler (fan coil) with a
TXV is required. Coils with cap tubes may not be used. If coil
includes removable Äxed oriÄce, the oriÄce must be removed
and a TXV must be installed as shown in Figure 10. Fasten
the copper line set to the coil. Nitrogen should be circulated
through the system at 2-3 psi [13.8-20.7 kPa] to prevent
oxidation inside the refrigerant tubing. Use a low silver phos-
copper braze alloy on all brazed connections.
• Basic charge includes only the amount required for the condensing unit and the evaporating coil.
An additional amount should be added allowing 0.6oz per ft. for 3/8” [0.6g per cm] and 1.2oz per ft. for 1/2” [1.1g per cm] of lineset used.
†Factory charge is preset for 25’ [7.6 meters] lineset.
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
18
CAUTION! Puron®systems operate at higher pressures
than R-22 systems. Be certain that service equipment
(gauges, tools, etc.) is rated accordingly. Some R-22
service equipment may not be acceptable.
Model Factory† Charge (oz)
[kg]
Basic*
Charge (oz)
[kg]
20 Feet [6 meters] 40 Feet [12 meters] 60 Feet [18 meters]
Liquid Suction Liquid Suction Liquid Suction
TTS/TTP Series
026 92 [2.61] 75 [2.13] 3/8” 7/8” 3/8” 7/8” 3/8” 7/8”
038 120 [3.40] 89 [2.52] 3/8” 7/8” 3/8” 7/8” 3/8” 7/8”
049 142 [4.02] 111 [3.15] 1/2” 7/8” 1/2” 7/8” 1/2” 7/8”
064 204 [5.78] 138 [3.91] 1/2” 7/8” 1/2” 7/8” 1/2” 7/8”
50YDS/50YPS Series

Figure 9: Braze Instructions
Fully Insulated
Suction Line
Fully Insulated
Liquid Line
Nitrogen Braze
Position Description System Service
Port
CCW - Full Out
CCW - Full Out 1/2 turn CW
CCW - Full In
Operation Position
Service Position
Shipping Position
Open
Open Open
Open
Closed
Closed
Table 6: Service Valve Positions
Figure 10: Air Coil Connection
TXV (‘IN’ toward
compressor section)
Suction Line
Liquid Line
Bulb (Must be
Installed and
Insulated) Equalizer
Line
TXV has internal
check valve
FP2
Sensor
Fully Insulated
Suction Line
Fully Insulated
Liquid Line
Nitrogen Braze
Vapor
)XOO\,QVXODWHG
/LTXLG/LQH
)XOO\,QVXODWHG
9DSRU/LQH
Refrigeration Installation
ѥCAUTION! ѥ
CAUTION! This procedure should not be performed
on systems which contain containments (Example:
compressor burn out).
ѥWARNING! ѥ
WARNING! If at all possible, it is recommended that a
new line set be used when replacing an existing R-22
system with an HFC-410A system. In rare instances
where replacing the line set is not possible, the line set
must be Åushed prior to installation of the HFC-410A
system. It is also important to empty all existing traps.
Polyolester (POE) oils are used in units charged with
HFC-410A refrigerant. Residual mineral oil can act as an
insulator on the wall of the coil tubing, hindering proper
heat transfer and thus reducing system efÄciency and
capacity. Another important reason to thoroughly Åush
the line set is remove any trash and other contaminants
that may be present which could clog the thermal
expansion valve.
Failure to properly Åush the system per the instructions
below will void the warranty.
ѥWARNING! ѥ
WARNING! The Environmental Protection Agency
prohibits the intentional venting of HCFC and HFC
refrigerants during maintenance, service, repair and
disposal of appliance. Approved methods of recovery,
recycling or reclaiming must be followed.
19
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
Re-Using Existing Line Set - R-22 to Puron®Conversion
New line sets are always recommended, but are required if;
• The previous system had a compressor burn out.
• The existing line set has oil traps.
• The existing line set is larger or smaller than the
recommended line set for the Puron®system.
• The existing line set is damaged, corroded, or shows signs
of abrasion/fatigue
Required Equipment
The following equipment will be required in order to Åush the
indoor coil and existing line set:
• Two R-22 recovery cylinders
• Refrigerant recovery machine with a pump down feature
• Two sets of gauges (one used for R-22 and one used with
Puron® .
• Cylinder of clean R-22 (minimum amount required to
adequately Åush shown below)

Refrigeration Installation
Residential Split Units - 60Hz Puron®
Rev.: 6 Dec., 2011
20
• 3/4” diameter suction lines: 1/4 lb. per foot of line set +
1 lb. per ton for indoor coil.
• 7/8” diameter suction lines: 1/3 lb. per foot of line set +
1 lb. per ton for indoor coil
• 1-1/8” diameter suction lines: 1/2 lb. per foot of line set
+ 1 lb. per ton for indoor coil.
Example: 3-ton system with 40 ft. long line set and 3/4”
suction line.
Line set: 1/4 lb./ft. x 40 ft. = 10 lb.
Indoor coil: 1 lb./ton x 3 tons = 3 lbs. (not required if coil
is removed and lines are connected together)
Total: 10 lbs. + 3 lbs. = 13 lbs. to adequately Åush line
set and indoor coil.
The Flushing Procedure
1. Remove the existing R-22 refrigerant by selecting the
appropriate procedure stated below.
If the unit is not operational, follow steps A-E.
• A.) First, disconnect all power supply to the existing
outdoor unit.
• B.) Connect a clean refrigerant recovery cylinder and
the refrigerant recovery machine to the existing unit
according to the instructions provided with the recovery
machine.
• C.) Remove all R-22 refrigerant from the existing system.
• D.) Check the gauges after shutdown to conÄrm all
refrigerant has been completely removed from the entire
system.
• E.) Disconnect the liquid and vapor lines from the
existing outdoor unit.
If the unit is operational, follow steps F- L.
• F.) First, start the existing R-22 system in the cooling
mode and close the liquid line valve.
• G.) Completely pump all existing R-22 refrigerant into
the outdoor unit. It will be necessary to bypass the low
pressure switch if the unit is so equipped to ensure that
the refrigerant is completely evacuated.)
• H.) The low side system pressures will eventually reach 0
psig. When this happens, close the vapor line valve and
immediately shut the outdoor unit off.
• I.) Check the gauges after shutdown to conÄrm that the
valves are not allowing refrigerant to leak back into the
low side of the system.
• J.) Disconnect power to the indoor furnace or air-
handler to kill low voltage to the outdoor unit.
• K.) Disconnect the power supply wiring from the
existing outdoor unit.
• L.) Unsweat the liquid and vapor lines from the existing
outdoor unit.
2. Remove the existing outdoor unit.
3. Set the new Puron® unit in place and braze the liquid
and vapor lines to the unit connections. Connect the low
voltage and line voltage to the new outdoor unit. Do not
turn on power supply to the unit and do not open the
outdoor unit service valves at this time.
4. The indoor coil can be left in place for the Åushing process
or removed.
5. If the indoor coil is removed, the suction and liquid line
must be connected together on the indoor coil end. See
illustration for recommended method for connecting these
together.
6. If the indoor coil is left in place during Åushing, removing