ClimateMaster Tranquility 27 Split (TTS) Series 97B0047N02 Guide

Tranquility®27
Split (TTS) Series
Indoor Split
Geothermal Heat Pump
Installation, Operation &
Maintenance Instructions
97B0047N02
Revision: 8 May, 2014C
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 9
Ground-Loop Heat Pump Applications 10-11
Ground-Water Heat Pump Applications 12-13
Water Quality Standards 14
Lineset Information 18
Refrigeration Installation 15-22
Hot Water Generator 23-25
Electrical - Line Voltage 26
Power Connection 26
Electrical - HWG Wiring 26
Electrical - Low Voltage Wiring 27-29
Thermostat Wiring 30-31
CXM Controls 32-34
Unit Starting and Operating Conditions 35-36
Unit Start-Up Procedure 36
Unit Operating Conditions 38-39
Preventive Maintenance 40
Troubleshooting 41
CXM Process Flow Chart 42
Functional Troubleshooting 43-44
Performance Troubleshooting 44
Troubleshooting Form 45
Warranty 46
Revision History 48

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Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
climatemaster.com 3
Model Nomenclature:for Indoor Split Series
NOTE: Above model nomenclature is a general reference. Consult individual specification catalogs
for detailed information.
Future
C0 2 6 CG 0 1 C N N
4 5 6 7
8
91011121314
026, 038, 049, 064
Unit Size
Voltage
C = CXM
Controls
C= Current revision for 026 - 064
Revision Level Heat Exchanger Options
Cabinet
Future
TT
1 2
TT = Tranquility Two-Stage Scroll
Series
S
3
S = Split
Configuration
Standard Copper Cupro-Nickel
CN
0 = None
Water Circuit Options
S
15
S = Standard
Standard
0 = Residential
1 = HWG w/Internal Pump
N = NotApplicable
N = NotApplicable
G = 208-230/60/1

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
4Geothermal Heating and Cooling
 WARNING! 
 WARNING! 
 CAUTION! 
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 proficiency requirements.
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: Notification of installation, operation or maintenance
information, which is important, but which is not hazard-
related.
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.
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
filters will quickly become clogged with construction dirt
and debris, which may cause system damage.
 WARNING! 
WARNING! The EarthPure®Application and Service
Manual should be read and understood before attempting
to service refrigerant circuits with HFC-410A.

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
climatemaster.com 5
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
significantly reduce performance, reliability, and service life.
Always move and store units in an upright position. Tilting
units on their sides may cause equipment damage.
 CAUTION! 
 CAUTION! 
Stora
g
e
P
re-
I
n
s
tallat
ion
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 filed
within 15 days, the freight company can deny the claim without
recourse. Note: It is the responsibility of the purchaser to file
all necessary claims with the carrier. Notify your equipment
supplier of all damage within fifteen (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, fittings, 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 configurations 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 finished.
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.
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.

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
6Geothermal Heating and Cooling
Equipment Selection
A
ir
C
oil Match-u
ps
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 efficiency.
Using an older-model coil can affect efficiency and may
not provide the customer with rated or advertised EER
and COP. Coil design and technology have dramatically
improved operating efficiency and capacity in the past 20
years. Homeowners using an older coil are not reaping these
cost savings and comfort benefits. NEVER MATCH AN R-22
INDOOR COIL WITH AN HFC-410A COMPRESSOR SECTION.
Newer indoor coils have a larger surface area, enhanced fin
design, and grooved tubing. These features provide a larger
area for heat transfer, improving efficiency and expanding
capacity. Typical older coils may only have one-third to one-
half the face area of these redesigned coils.
Indoor Coil Selection - Tranquility®27 (TTS)
ClimateMaster split system heat pumps are rated in the
AHRI directory with a specific indoor coil match. Tranquility
27 Splits are AHRI rated and listed with Tranquility TAH
air handlers and TAC cased coils. Other brands of air
handlers may attain proper performance and capacity
but will not be AHRI or Energy Star listed so will not
qualify for all utility rebates and tax credits, specifically
the Federal Energy Tax Credit for Geothermal Property
will not be available. Unlisted systems eligibility must
be determined by the system installer on a case by case
basis. Other brands of air handlers may attain the same
AHRI performance providing that the specifications meet
or exceed those listed in Tables 1, 1a, 1b or 1c. An ECM
motor and TXV is required. Cap tubes and fixed orifices
are not acceptable. PSC fans may be used if matched to
Table 1c, but will not meet AHRI performance. 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 airflow, supply air temperatures may not
be acceptable if the compressor is allowed to change stages
when used with a PSC fan motor.
Table 1: Tranquility®27 Air Handler Matches for AHRI Ratings
Compressor Section 026 038 049 064
Air Handler
Model TAH 026 038 049 064
Refrigerant HFC-410A
Metering Device TXV (required)
Air Coil
Type
Rows
Dimensions
A
2
14 x 17
A
2
24 x 17
A
2
24 x 17
A
3
24 x 17
Cabinet Configuration Upflow/Downflow/Horizontal (Multipoise)
Fan Motor Type - HP ECM - 1/2 ECM - 1/2 ECM - 1 ECM - 1

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
climatemaster.com 7
Equipment Selection
Table 1a: Tranquility®27 Carrier/Bryant Air Handler Matches for AHRI Performance
Compressor Section 026 038 049 064
Air Handler
Model FV4 003 005 006 006
Refrigerant HFC-410A
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 Configura-
tion
Upflow/Downflow/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-Effic 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
Table 1c: Tranquility® 27 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.
Table 1b: Tranquility® 27 Rheem/Ruud Air Handler Matches for AHRI Performance
Compressor Section 026 038 049 064
Air Handler Model RHPL-HM2421 RHPL-HM3621 RHPL-HM24 RHPL-HM6024
Refrigerant HFC-410A
Metering Device TXV (Non Bleed) required
Air Coil
Type
Rows - Fins/in.
Face Area (sq. ft.)
N Style
2 - 16 fpi
5.7
N Style
2 - 16 fpi
5.7
N Style
2 - 16 fpi
8.55
N Style
3 - 14 fpi
9.98
Cabinet Configuration Upflow/Downflow/Horizontal (Multiposition)
ECM Settings Rheem Comfort
Control System
Rheem Comfort
Control System
Rheem Comfort
Control System
Rheem Comfort
Control System
Fan Motor Type - HP ECM - 1/3 HP ECM - 1/2 HP ECM - 3/4 HP ECM - 3/4 HP

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
8Geothermal Heating and Cooling
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 airflow
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 Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
climatemaster.com 9
Installation
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
compressor 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 HFC-410A refrigerant. If line set cannot be
replaced, it must be thoroughly flushed before installing
new compressor section. HFC-410A 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 flushed from the line set.
Unit Location
The TTS unit 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 sufficient
room to make water, electrical, and line set connections.
Any access panel screws that would be difficult 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 sufficient to
allow removal of the unit, if necessary.
5. Provide access to water valves and fittings and
screwdriver access to the unit side panels and all
electrical connections.
Air Handler Installation
This manual specifically addresses the compressor section
of the system. Air handler location and installation should
be according to the instructions provided with the air
handling unit.
Water Connections
The TTS models utilize swivel piping fittings 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 flush
end of most 1” threaded male pipe fittings provides a leak-
free seal without the need for thread sealing tape or joint
compound. Check for burrs and ensure 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.
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!
Gasket
Swivel Nut
Stainless steel
snap ring
Brass Adaptor
Hand Tighten
Only!
Do Not
Overtighten!
External Flow Controller Mounting
The Flow Controller can be mounted beside the unit as
shown in Figure 7. Review the Flow Controller installation
manual for more details.
Figure 2: TTS Installation
Figure 4: Water Connections

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
10 Geothermal Heating and Cooling
 CAUTION! 
Pre-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 fittings should not be used at any
time due to their tendency to corrode. All plastic to metal
threaded fittings should be avoided due to their potential to
leak in earth coupled applications. A flanged fitting should
be substituted. P/T plugs should be used so that flow
can be measured using the pressure drop of the unit heat
exchanger.
Ground-Loop Heat Pump Applications
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.
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 backfilling.
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 final
purging and charging. A flush cart with at least a 1.5 hp
[1.1 kW] pump is required to achieve enough fluid 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 flushing.
1. Fill loop with water from a garden hose through the flush
cart before using the flush cart pump to insure an even
fill.
2. Once full, the flushing process can begin. Do not allow
the water level in the flush 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 fluid level in the tank above the return
tee so that air cannot be continuously mixed back into
the fluid. Surges of 50 psi (345 kPa) can be used to help
purge air pockets by simply shutting offthe return valve
going into the flush 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 fluid level in the flush 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 flush tank (about a
half gallon [2.3 liters]), since liquids are incompressible. If
the level drops more than this, flushing should continue
since air is still being compressed in the loop fluid.
Perform the “dead head” procedure a number of times.
Note: This fluid level drop is your only indication of air in
the loop.
Antifreeze may be added before, during or after the flushing
procedure. However, depending upon which time is chosen,
antifreeze could be wasted when emptying the flush cart
tank. See antifreeze section for more details.
Loop static pressure will fluctuate with the seasons.
Pressures will be higher in the winter months than during
the cooling season. This fluctuation 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 final flush 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 flooded. This is not required
for Taco circulators. Insure that the Flow Controller provides
adequate flow through the unit by checking pressure drop
across the heat exchanger and compare to the pressure
drop tables at the back of the manual.
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

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
climatemaster.com 11
Ground-Loop Heat Pump Applications
-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 fluid 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 specific 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.
Table 3: Antifreeze Percentages by Volume
Table 2: Approximate Fluid Volume (U.S. gal. [L]) per
100' of Pipe
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)
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]
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
Propylene Glycol
Ethanol*
21%
29%
23%
17%
24%
20%
13%
18%
16%
8%
12%
11%
* Must not be denatured with any petroleum based product

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
12 Geothermal Heating and Cooling
Ground-Water Heat Pump Applications
Open Loop - Ground Water Systems
Typical open loop piping is shown in Figure 8. Shut offvalves
should be included for ease of servicing. Boiler drains or other
valves should be “tee’d” into the lines to allow acid flushing
of the heat exchanger. Shut offvalves should be positioned
to allow flow through the coax via the boiler drains without
allowing flow 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
qualified 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 flushing. 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 field, 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 flow 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 figure 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 flow 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 flow rate from Table 14. Since the pressure is
constantly varying, two pressure gauges may be needed.
Adjust the valve until the desired flow of 1.5 to 2 gpm per
ton [2.0 to 2.6 l/m per kW] is achieved. A second method
of flow control requires a flow control device mounted on
the outlet of the water control valve. The device is typically
a brass fitting with an orifice of rubber or plastic material
that is designed to allow a specified flow rate. On occasion,
flow 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.

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
climatemaster.com 13
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
 CAUTION! 
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with ClimateMaster
equipment.

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
14 Geothermal Heating and Cooling
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.: 5/6/2014 S
• NR - Application not recommended.
• "-" No design Maximum.
• Closed Recirculating system is identified by a closed pressurized piping system.
• Recirculating open wells should observe the open recirculating design considerations.
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.
The ClimateMaster Water Quality Table provides water quality requirements for ClimateMaster coaxial heat exchangers. The water should be evaluated by an
independent testing facility comparing to this Table and when properties are outside of these requirements, an external secondary heat exchanger must be used to
isolate the heat pump heat exchanger from the unsuitable water. Failure to do so will void the warranty for the coaxial heat exchanger and any other components
damaged by a leak.
Table 4: Water Quality Standards
Water Quality Standards

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
climatemaster.com 15
Refrigeration Installation
 CAUTION! 
CAUTION! Installation of a factory supplied liquid line
bi-directional filter drier is required. Never install a suction
line filter in the liquid line.
 CAUTION! 
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 filter 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, floor joists, wall studs,
floors 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 fixed orifice, the orifice 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 compressor section 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.
CAUTION! HFC-410A systems operate at higher
pressures than R-22 systems. Be certain that service
equipment (gauges, tools, etc.) is rated for HFC-410A.
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 Series
026 93 [2.64] 76 [2.15] 3/8” 3/4” 3/8” 3/4” 3/8” 3/4”
038 120 [3.40] 89 [2.52] 3/8” 7/8” 3/8” 7/8” 3/8” 7/8”
049 137 [3.89] 106 [3.01] 3/8” 7/8” 3/8” 7/8” 3/8” 7/8”
064 212 [6.01] 150 [4.25] 1/2” 7/8” 1/2” 7/8” 1/2” 7/8”

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
16 Geothermal Heating and Cooling
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
Refrigeration Installation
 CAUTION! 
CAUTION! This procedure should not be performed
on systems which contain containments (Example:
compressor burn out).
 WARNING! 
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 flushed 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 efficiency and
capacity. Another important reason to thoroughly flush
the line set is remove any trash and other contaminants
that may be present which could clog the thermal
expansion valve.
Failure to properly flush the system per the instructions
below will void the warranty.
 WARNING! 
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.
Re-Using Existing Line Set - R-22 to HFC-410A
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 HFC-410A 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 flush 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
the HFC-410A).
• Cylinder of clean R-22 (minimum amount required to
adequately flush shown below)

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
climatemaster.com 17
Refrigeration Installation
° 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 flush 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
compressor section.
• 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 confirm all
refrigerant has been completely removed from the entire
system.
• E.) Disconnect the liquid and vapor lines from the
existing compressor section.
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 compressor section. 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 compressor section off.
• I.) Check the gauges after shutdown to confirm 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 compressor section.
• K.) Disconnect the power supply wiring from the
existing compressor section.
• L.) Unsweat the liquid and vapor lines from the existing
compressor section.
2. Remove the existing compressor section.
3. Set the new HFC-410A unit in place and braze the liquid
and vapor lines to the unit connections. Connect the low
voltage and line voltage to the new compressor section.
Do not turn on power supply to the unit and do not open
the compressor section service valves at this time.
4. The indoor coil can be left in place for the flushing 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.

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
18 Geothermal Heating and Cooling
Refrigeration Installation
6. If the indoor coil is left in place during flushing, removing
the existing refrigerant flow control orifice or thermal
expansion valve prior to flushing is highly recommended
to assure proper flushing. Use a field-provided fitting or
piece of copper tubing to reconnect the lines where the
thermal expansion valve was removed.
7. Remove the pressure tap valve cores from the compressor
section’s service valves.
8. Connect an R-22 cylinder of clean R-22 refrigerant to the
vapor service valve. (see “Required Equipment Section”
for minimum required amount of R-22 for adequate
flushing)
9. Connect the low pressure side of an R-22 gauge set to the
liquid line valve.
10. Connect a hose from the recovery machine with an empty
recovery drum to the common port of the gauge set.
11. Set the recovery machine for liquid recovery and start the
machine.
12. Open the gauge set low side valve. This will allow the
recovery machine to pull a vacuum on the existing system
line set.
13. Make sure to invert the cylinder of clean R-22 refrigerant
and open the cylinder’s valve to allow liquid refrigerant to
flow into the system through the vapor line valve. (This
should allow the refrigerant to flow from the cylinder and
through the line set before it enters the recovery machine.)
The cylinder should not be inverted if it is the type with
separate liquid and vapor valves. Use the liquid valve on
the cylinder in this case, keeping the cylinder upright.
14. Once the liquid refrigerant has been completely recovered,
switch the recovery machine to vapor recovery so that the
R-22 vapor can be completely recovered.
IMPORTANT! Always remember, every time the
system is flushed you must always pull a vacuum
with a recovery machine on the system at the
end of each procedure. (If desired, a second flushing
with clean refrigerant may be performed if insufficient
amounts of mineral oil were removed during the initial
flush.)
15. Tightly close the valve on the inverted R-22 cylinder and
the gauge set valves.
16. Completely pump all remaining R22 refrigerant out of the
recovery machine and turn the machine off.
17. Before removing the recovery machine, R-22 refrigerant
cylinder and gauges, break the vacuum on the refrigerant
lines and indoor coil using dry-nitrogen.
18. Unsweat the liquid and vapor lines from the old indoor coil
or from each other and install a new matched HFC-410A
indoor coil, connecting the flushed refrigerant lines to the
new coil using field supplied connectors and tubing.
19. Reinstall pressure tap valve cores into unit service valves.
20. Pressurize the lines and coil and check for leaks in the line
set connection points using a soap solution.
21. Thoroughly evacuate the line set and indoor coil per the
instructions found in this manual.
22. Open the liquid and vapor service valves, releasing the
HFC-410A refrigerant contained in the compressor section
into the evacuated line set and indoor coil.
23. Energize the system and adjust the refrigerant charge
according to the charging procedures found in this
manual.

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
climatemaster.com 19
Refrigeration Installation
FP2 Sensor Installation
An FP2 sensor with violet wiring is shipped loose with the
compressor section. This is the air coil low temperature
protection sensor. Install this sensor on the refrigerant line
between the indoor expansion valve and the air coil using
thermal compound and the supplied mounting clips. Ensure
that the sensor makes good thermal contact with the refrigerant
line and insulate the sensor.
Air coil low temperature protection will not be active if this
sensor is installed incorrectly or is not installed.
Add-On Heat Pump Applications
The indoor coil should be located in the supply side of
the furnace to avoid condensation damage to the furnace
heat exchanger for add-on heat pump applications. A high
temperature limit switch should be installed as shown in
Figure 11b just upstream of the coil to de-energize the
compressor any time the furnace is energized to avoid
blowing hot air directly into the coil, elevating refrigerant
pressures during operation. The heat pump will trip out on
high pressure lockout without some method of disengaging
the compressor during furnace operation. Alternatively, some
thermostats with “dual fuel” mode will automatically de-
energize the compressor when second stage (backup) heat
is required.
The TXV should be brazed into place as shown in Figure 10,
keeping the “IN” side toward the compressor section. The
TXV has an internal check valve and must be installed in the
proper direction for operation. Always keep the valve body
cool with a brazing shield and wet rags to prevent damage
to the TXV. Attach the bulb to the suction line using the
supplied hose clamp. Be careful not to overtighten the clamp
and deform the bulb.
NOTICE! The air coil should be thoroughly washed with a
filming agent, (dishwasher detergent like Cascade) to help
condensate drainage. Apply a 20 to 1 solution of detergent
and water. Spray both sides of coil, repeat and rinse
thoroughly with water.
Evacuation and Charging the Unit
LEAK TESTING - The refrigeration line set must be pressurized
and checked for leaks before evacuating and charging the unit.
To pressurize the line set, attach refrigerant gauges to the service
ports and add an inert gas (nitrogen or dry carbon dioxide) until
pressure reaches 60-90 psig [413-620 kPa]. Never use oxygen or
acetylene to pressure test. Use a halogen leak tester or a good
quality bubble solution to detect leaks on all connections made
in the field. Check the service valve ports and stem for leaks. If
a leak is found, repair it and repeat the above steps. For safety
reasons do not pressurize system above 150 psig [1034 kPa].
System is now ready for evacuation and charging.
Turn service valves full out CCW (see Table 6) and then turn
back in one-half turn to open service ports. Add the required
refrigerant so that the total charge calculated for the unit
and line set is now in the system. Open the service valve
fully counter clockwise so that the stem will backseat and
prevent leakage through the schrader port while it is not in
use. Start unit in the heating mode and measure superheat
and subcooling values after 5 minutes of run time. See
tables 14d for superheat and sub-cooling values. Superheat
is measured using suction temperature and pressure at the
compressor suction line. Subcooling should be measured
using the liquid line temperature immediately outside the
compressor section cabinet and either the liquid line service
valve pressure or the compressor discharge pressure. Note
that different values from tables 14d will be obtained due to
the pressure losses through the condenser heat exchanger.
Adding refrigerant will increase sub-cooling while superheat
should remain fairly constant allowing for a slight amount
of hunting in TXV systems. This increase in subcooling will
require 5 minutes or so of operation before it should be
measured. After values are measured, compare to the chart
and go to “FINAL EVALUATION.”
PARTIAL CHARGE METHOD - Open service valve fully
counterclockwise and then turn back in one-half turn to
open service port. Add vaporized (Gas) into the suction side
of the compressor until the pressure in the system reaches
approximately 100-120 psig. Never add liquid refrigerant into
the suction side of a compressor. Start the unit in heating
and add gas to the suction port at a rate not to exceed
five pounds [2.27 kg] per minute. Keep adding refrigerant
until the complete charge has been entered. Superheat is
measured using suction temperature and pressure at the
compressor suction line. Subcooling should be measured
using the liquid line temperature immediately outside the
compressor section cabinet and either the liquid line service
valve pressure or the compressor discharge pressure. Note
that different values from tables 14d will be obtained due to
the pressure losses through the condenser heat exchanger.
Adding refrigerant will increase sub-cooling while superheat
should remain fairly constant allowing for a slight amount
of hunting in TXV systems. This increase in subcooling will
require 5 minutes or so of operation before it should be
measured. After values are measured, compare to the chart
and go to “FINAL EVALUATION.”
FINAL EVALUATION -In a split system, cooling subcooling
values can be misleading depending on the location of the
measurement. Therefore, it is recommended that charging
be monitored in the heating mode. Charge should be
evaluated by monitoring the subcooling in the heating mode.
After initial check of heating sub-cooling, shut offunit and
allow to sit 3-5 minutes until pressures equalize. Restart unit
in the cooling mode and check the cooling superheat against
Tables 14d. If unit runs satisfactorily, charging is complete. If
unit does not perform to specifications the cooling TXV (air
coil side) may need to be readjusted (if possible) until the
cooling superheat values are met.

Residential Tranquility®27 Split (TTS) - 60Hz HFC-410A
Rev.: 8 May, 2014C
20 Geothermal Heating and Cooling
Refrigeration Installation
Checking Superheat and Subcooling
Determining Superheat:
1. Measure the temperature of the suction line at a point
near the expansion valve bulb.
2. Determine the suction pressure by attaching refrigeration
gauges to the suction schrader connection at the
compressor.
3. Convert the pressure obtained in step 2 to saturation
temperature (boiling point) by using the pressure/
temperature conversion table on the gauge set.
4. Subtract the temperature obtained in step 3 from step
1. The difference will be the superheat of the unit or the
total number of degrees above saturation temperature.
Refer to Tables 14d for superheat ranges at specific
entering water conditions.
Example:
The temperature of the suction line at the sensing bulb is
50°F. The suction pressure at the compressor is 110 psig
which is equivalent to 36°F saturation temperature from the
HFC-410A press/temp conversion table on the gauge set.
36°F subtracted from 50°F = 14°F Superheat.
Determining Sub-Cooling:
1. Measure the temperature of the liquid line on the smaller
refrigerant line (liquid line) just outside of the cabinet.
This location will be adequate for measurement in both
modes unless a significant temperature drop in the liquid
line is anticipated.
2. Determine the condensor pressure (high side) by
attaching refrigerant gauges to the schrader connection
on the liquid line service valve. If the hot gas discharge
line of the compressor is used, refer to the appropriate
column in Tables 14d.
3. Convert the pressure obtained in step 2 to the
saturation temperature by using the press/temp
conversion table on the gauge set.
4. Subtract the temperature of Step 3 from the temperature of
Step 1. The difference will be the sub-cooling value for that
unit (total degrees below the saturation temperature). Refer
to Tables 14a to 14d for sub-cooling values at specific
entering water temperatures.
Example:
The condenser pressure at the service port is 335 psig,
which is equivalent to 104°F saturation temperature.
Discharge pressure is 365 psig at the compressor (109°F
saturation temperature). Measured liquid line temperature is
100°F. 100°F subtracted from 104°F = 4 degrees sub-cooling
(9 degrees if using the compressor discharge pressure).