Nibe CLIMATEMASTER Tranquility TES Guide

Table of Contents
Model Nomenclature 3
Safety 4
General Information 5
Equipment Selection 6
Installation 7
vFlow®Heat Pump Applications Overview 9
Closed Loop Heat Pump Applications
w/Internal Flow Controller 10
Flushing the Earth Loop 12
Multiple Unit Piping and Flushing 15
Ground Loop Heat Pump Applications 18
Closed Loop – External Central Pumping Applications
(Indoor Split TES Only)20
Open Loop or Ground Water Heat Pump Applications 21
Water Quality Standards 23
Refrigeration Installation 27
Hot Water Generator 35
Hot Water Generator: For Indoor and Outdoor
Compressor Section Only 37
Hot Water Generator Module Refrigeration
Installation: For Outdoor Compressor Section Only 38
Electrical – Line Voltage 40
Electrical – Power Wiring 41
Electrical – Low Voltage Wiring 42
Electrical –Thermostat Wiring 43
Controls – DXM2.5 44
Wiring Diagrams 45
Unit Starting and Operating Conditions 50
Unit Start-Up Procedure 52
Unit Operating Conditions 54
Performance Data 56
Preventive Maintenance 60
Troubleshooting 61
DXM2.5 Functional Troubleshooting Flow Chart 63
Functional Troubleshooting 64
Performance Troubleshooting 66
Troubleshooting Form 68
Warranty 69
Revision History 72
Tranquility®Digital
Split Products (TES/TEP)
97B0047N05
Indoor and Outdoor Split
Geothermal Heat Pumps
Installation, Operation &
Maintenance Instructions
Rev.: October 18, 2022
Tranquility®Digital Split
Indoor (TES)Series
Tranquility®Digital Split
Outdoor (TEP)Series

Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
2Geothermal Heating and Cooling
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3
Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
climatemaster.com
Model Nomenclature
T E
1 2
S
3
0 2 6
4 5 6
B
7
G
8
D
9
0
10
2
11
C
12
S
15
N
13
N
14
TE = TRANQUILITY® DIGITAL
SERIES
S = SPLIT (Indoor)
CONFIGURATION
026
038
049
064
UNIT SIZE
B = CURRENT REVISION
REVISION LEVEL
G = 208-230/60/1
VOLTAGE
CONTROLS
CABINET
HEAT EXCHANGER OPTIONS
HWG w/Pump (Standard) C
COPPER
N
CUPRO-NICKEL
No-HWG A J
D = DXM2.5
B = DXM2.5 w/DISCONNECT
4 = DXM2.5 w/SECURE START
0 = RESIDENTIAL
STANDARD
S = STANDARD
FUTURE
N = NOT APPLICABLE
FUTURE
N = NOT APPLICABLE
0 = None
1 = Internal Flow Controller Standard Head w/ check valve – Closed Loop
(available for unit sizes (026 to 038 only)
A = Internal Flow Controller Standard Head w/o check valve – Closed Loop
(available for unit sizes (026 to 038 only)
2 = Internal Flow Controller High Head w/ check valve – Closed Loop
B = Internal Flow Controller High Head w/o check valve – Closed Loop
5 = Motorized Modulating Valve (Central Pumping Applications) – Closed Loop
6 = Motorized Modulating Valve (Ground Water Applications) – Open Loop
WATER CIRCUIT OPTIONS
vFlow®
All Open Loop vFlow Water Circuit Options require a Cupro-Nickel Coil Heat Exchanger.
All Closed Loop vFlow Water Circuit Options require a Copper Coil Heat Exchanger.
If “None” is selected, then the Heat Exchanger can be either Copper or Cupro-Nickel
T E
1 2
P
3
0 2 6
4 5 6
B
7
G
8
D
9
0
10
2
11
A
12
S
15
N
13
N
14
TE = TRANQUILITY® DIGITAL
SERIES
P = PROTECTIVE CABINET (Outdoor)
CONFIGURATION
026
038
049
064
UNIT SIZE
B = CURRENT REVISION
REVISION LEVEL
G = 208-230/60/1
VOLTAGE
CONTROLS
CABINET
HEAT EXCHANGER OPTIONS
D = DXM2.5
0 = RESIDENTIAL
STANDARD
S = STANDARD
FUTURE
N = NOT APPLICABLE
FUTURE
N = NOT APPLICABLE
1 = Internal Flow Controller Standard Head w/ check valve – Closed Loop
(available for unit sizes (026 to 038 only)
A = Internal Flow Controller Standard Head w/o check valve – Closed Loop
(available for unit sizes (026 to 038 only)
2 = Internal Flow Controller High Head w/ check valve – Closed Loop
B = Internal Flow Controller High Head w/o check valve – Closed Loop
WATER CIRCUIT OPTIONS
vFlow®
A = NON-HWG w/COPPER

Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
4Geothermal Heating and Cooling
Safety
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.
⚠
WARNING!
⚠
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.
⚠
WARNING!
⚠
WARNING! The EarthPure®Application and Service
Manual should be read and understood before attempting
to service refrigerant circuits with HFC-410A.
The following warning complies with State of California law,
Proposition 65.
⚠
WARNING!
⚠
WARNING! This product can expose you to chemicals
including Carbon Black, which is known to the State of
California to cause cancer and Methanol, which is known
to the State of California to cause birth defects or other
reproductive harm. For more information go to
www.P65Warnings.ca.gov.
⚠
WARNING!
⚠
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!
⚠
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 can quickly become clogged with construction dirt
and debris, which may cause system damage and void
product warranty.

5
Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
climatemaster.com
General Information
Storage
Pre-Installation
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. 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.
⚠
CAUTION!
⚠
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 will cause equipment damage.
⚠
CAUTION!
⚠
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.

Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
6Geothermal Heating and Cooling
Equipment Selection
Air Coil Match-ups
GENERAL
Proper indoor coil selection is critical to system efciency.
Using an older-model coil can affect efciency and may
not provide the customer with rated or advertised EER
and COP. Coil design and technology have dramatically
improved operating efciency and capacity in the past 20
years. Homeowners using an older coil are not reaping these
cost savings and comfort benets. NEVER MATCH AN
R-22 INDOOR COIL WITH AN HFC-410A COMPRESSOR
SECTION.
Newer indoor coils have a larger surface area, enhanced n
design, and grooved tubing. These features provide a larger
area for heat transfer, improving efciency 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®(TES & TEP)
ClimateMaster Split System Heat Pumps are rated in the AHRI
directory with a specic indoor coil match. Tranquility models
are rated with Tranquility Air Handlers and Cased Coils.
Table 1: Tranquility Split System AHRI Rated Components
COMPRESSOR SECTION AIR HANDLER CASED COIL
TES/P026 TAH026 TAC026
TES/P038 TAH038 TAC038
TES/P049 TAH049 TAC049
TES/P064 TAH064 TAC064
COMMUNICATING SYSTEM
To receive full benets of the 4-wire communicating system,
always select a Tranquility Digital Air Handler with AXM
Control and an iGate®2 Communicating (AWC) Thermostat
with Tranquility Digital Splits (TES/TEP).
INDOOR/OUTDOOR APPLICATION
Select Tranquility Digital INDOOR Split (TES) with Tranquility
Digital Air Handler or cased coil for applications with a
compressor and air handler/coil used indoors.
Select Tranquility Digital OUTDOOR Split (TEP) with
Tranquility Digital Air Handler or cased coil applications with
an outdoor compressor section and air handler/coil used
indoors.

7
Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
climatemaster.com
Installation
⚠
CAUTION!
⚠
CAUTION! To avoid equipment damage to TES/TEP
units with expansion tank, DO NOT allow system water
pressure to exceed 145 psi [1000 kPa]. The expansion
tank used in TES/TEP units has a maximum working water
pressure of 145 psi [1000 kPa]. Any pressure in excess of
145 psi [1000 kPa] may damage the expansion tank.
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.
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 HFC-410A refrigerant. If line set cannot be
replaced, it must be thoroughly ushed 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 ushed 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 sufcient room to make water,
electrical, and line set connections.
Any access panel screws that would be difcult to remove
after the unit is installed should be removed prior to setting
the unit. Refer to Figure 1 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” [10 mm] to 1/2” [13 mm] 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 heat
exchanger without removing the unit.
4. Provide an unobstructed path to the unit within the
closet or mechanical room. Space should be sufcient to
allow removal of the unit, if necessary.
5. Provide access to water valves and ttings 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 condenser 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” - 32 mm) and insulation (½”
[13 mm] wall thickness). Figure 3 illustrates location and
dimensions of the holes required.
AIR HANDLER INSTALLATION
This manual specically addresses the compressor section
of the system. Air handler location and installation should be
according to the instructions provided with the air handling
unit (Tranquility Digital Air Handler )

Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
8Geothermal Heating and Cooling
WATER CONNECTIONS
Swivel piping ttings are used 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 ush end of most 1”
threaded male pipe ttings 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!
Installation
Gasket
Swivel Nut
Stainless steel
snap ring
Brass Adaptor
Hand Tighten
Only!
Do Not
Overtighten!
Bottom View
of Unit
26Ó x 37Ó
(66 x 94cm)
Existing Pad larger than 26 x 37 [66 x 94cm]
32.6Ó
[83cm]
7.5Ó
[19cm]
9.3Ó
[23.5cm]
4.6Ó [11.7cm]
Air Pad With
Access Hole
Stainless
Steel
Braided
Connecting
Hoses
NOTE: OUTDOOR UNIT WATER CONNECTIONS
TEP026 and 038 units are shipped with ¾” stainless steel
braided hoses connected to unit piping. Field connection end
of hoses are gasketed female swivel.
TEP049 and 064 units are shipped with 1” stainless steel
braided hoses connected to unit piping. Field connection end
of hoses are gasketed female swivel.
A
Swivel
Loop End Stainless Steel Outer Braid NPT(M)
Unit End
Return
Supply
NPSH(F)
⚠
WARNING!
⚠
WARNING! Polyolester Oil, commonly known as POE
oil, is a synthetic oil used in many refrigeration systems
including those with HFC-410A refrigerant. POE oil, if it
ever comes in contact with PVC or CPVC piping, may
cause failure of the PVC/CPVC. PVC/CPVC piping should
never be used as supply or return water piping with water
source heat pump products containing HFC-410A as
system failures and property damage may result.
Figure 1: TES Installation
Figure 2: Water Connections (TES Series)
Figure 3: TEP Installation

9
Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
climatemaster.com
vFlow®Heat Pump Applications Overview
Figure 4a: Typical Closed Loop Application
(with Internal Flow Controller Shown)
OPTIONAL vFLOW®INTERNAL VARIABLE
WATER-FLOW CONTROL
vFlow® is an efcient means of circulating water (or water plus
antifreeze) using internal factory installed variable speed pump
or modulating motorized valve. vFlow technology improves
performance of the unit by reducing the amount of energy
required to ow water throughout the geothermal heat pump
system and also reduces the space, cost, and labor required
to install external water ow control mechanisms (such as
pumps, ow controllers, solenoid, and ow control valves)
vFLOW CONFIGURATIONS
1. Internal Flow Controller –
For Closed Loop Applications
This is the most common conguration for closed loops.
With this factory-installed option, the unit is built with
an Internal Variable Speed Pump and other components
to ush and operate the unit correctly (including an
expansion tank, ush ports and ushing valves). The
pump speed is controlled by the DXM2.5 control based on
the difference in entering and leaving water temperatures
(ΔT). The Internal Flow Controller pump includes an
internal check valve for multiple unit installations. A
copper water coil is standard with this option.
NOTE: Internal Flow Controllers are also very suitable
for multiple unit installations depending on pump
performance requirements.
2. Internal Modulating Motorized Valve –
For Large Closed Loop Applications
(external central pumping)
Primarily for use on multi-unit closed loop applications with
central pumping. With this factory-installed option, the
unit includes a low pressure drop modulating motorized
valve that is controlled by the DXM2.5 microprocessor
control based on the difference in the entering and leaving
water temperatures (ΔT). A Copper Water Coil is standard
with this option. The modulating valve in this option has a
higher Cv than the open loop option.
3. Internal Modulating Motorized Valve –
For Open Loop Applications (TES Models Only)
For use on open loop applications. With this factory-
installed option, the unit is built with an internal
modulating motorized valve controlled by the
Communicating DXM2.5 control board based on
entering and leaving water temperatures (ΔT). A low Cv
modulating motorized valve is used for this application
to provide more precise control against the higher
system pressure differential of open loop applications. A
Cupro-Nickel water coil comes standard with this option.
Details on these options are included in the following
sections on ground loop and ground water applications.
Vibration Isolation Pad
Internal Flow
Controller
Water In
Water Out
High and Low
Voltage Knockouts
To Thermostat
High and Low
Voltage Knockouts
Vibration Isolation Pad
To Thermostat
Internal Motorized
Modulating Valve
Water Out
Shut Off
Ball Valves
for Isolation
Water In
Pressure
Tank
Optional
Filter
Boiler
Drains
Figure 4b: Typical Open-Loop Application
(with Internal Modulating Motorized
Valve Shown)
For use on applications using external source for ow
⚠
CAUTION!
⚠
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 to ALL applicable codes. It is
the responsibility of the installing contractor to determine
and comply with ALL applicable codes and regulations.

Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
10 Geothermal Heating and Cooling
Closed Loop Heat Pump Applications w/Internal Flow Controller
Units with internal ow control come with a built-in variable
speed pump, an expansion tank, ushing ports and three-
way valves (used to ush the unit). The variable speed pump
is controlled by the Communicating DXM2.5 board based
on the difference between the entering and leaving water
temperature (ΔT). When entering water temperatures are
abnormally low for cooling, or abnormally high for heating,
the DXM2.5 controller will modulate the water ow to
maintain a constant ΔT which will allow the unit to operate
properly under those conditions. The internal expansion tank
helps to maintain constant loop pressure despite the natural
expansion and contraction of the loop as the seasons and
loop temperatures vary. The expansion tank also helps to
avoid at loop callbacks.
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 4a. All earth loop piping materials should be limited to
polyethylene fusion only for in-ground sections of the loop
and it is also recommended for inside piping. Galvanized
or steel ttings should not be used at any time due to their
tendency to corrode. All plastic to metal threaded ttings
should be avoided due to their potential to leak in ground
loop applications. 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 backlling.
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.
The following section will help to guide you through ushing
a unit with internal ow control.
Figure 5: Internal Flow Controller
⚠
NOTICE!
⚠
NOTICE! If installing MULTIPLE vFlow® Internal Variable
Speed Flow Controller units (in parallel) on one loop,
please refer to section ‘Multiple Unit Piping and Flushing’
(later in this document).
WATER PRESSURE SCHRADER PORTS
The pressure ports built in to the unit are provided as a
means of measuring pressure drop through the water-to-
refrigerant heat exchanger. The water pressure ports are
Schrader ports smaller than refrigerant Schrader ports.
They are the same size as tire Schrader ports. A digital
pressure gauge is recommended for taking pressure readings
through these ports. The water ow through the unit can be
determined by measuring the water pressure at the “water
pressure out” port and subtracting it from the water pressure
at the “water pressure in” port. Comparing the pressure
differential to the pressure drop table (Table 14) in this
manual will determine the ow rate through the unit.
Digital Tire Pressure Gauge

11
Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
climatemaster.com
Closed Loop Heat Pump Applications w/Internal Flow Controller, Cont’d.
0
5
10
15
20
25
30
35
40
45
0 5 10 15 20 25
Head (.)
Flow (gpm)
No Check
Valve
With Check
Valve
Figure 6a: Standard Head Variable Pump Performance
Figure 6b: High Head Variable Pump Performance
0
5
10
15
20
25
30
35
0 5 10 15 20
Head (.)
Flow Rate (gpm)
No Check
Valve
With Check
Valve

Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
12 Geothermal Heating and Cooling
Flushing the Earth Loop
Figure 8a: Valve Position A – Loop Fill/Flush
Loop
Out
In
Valve Position
Flush Port
Front of Unit
Valve Position
Once piping is completed between the unit and the ground
loop, nal purging and charging of the loop is needed.
A ush cart (at least a 1.5 hp [1.1 kW] pump) is needed to
achieve adequate ow velocity in the loop to purge air and
dirt particles from the loop itself. Antifreeze solution is used
in most areas to prevent freezing. All air and debris must be
removed from the earth loop piping system before operation,
Flush the loop with a high volume of water at a high velocity
(2 fps [0.6 m/s] in all piping), using a lter in the loop return
line, of the ush cart to eliminate debris from the loop system.
See Table 2 for ow rate required to attain 2 fps [0.6 m/s]. The
steps below must be followed for proper ushing.
Table 2: Minimum Flow Required to Achieve 2 ft/sec
(0.6 m/s) velocity
PE Pipe Size Flow (GPM)
3/4" 4 [4.3 l/m per KW]
1" 6 [6.5 l/m per KW]
1 1/4" 10 [10.8 l/m per KW]
1 1/2" 13 [14.0 l/m per KW]
2" 21 [22.6 l/m per KW]
Units with internal variable speed pumps also include a
check valve internal to the pump. It is not possible to ush
backwards through this pump. Care must be taken to
connect the ush cart hoses so that the ush cart discharge
is connected to the “water in” ushing valve of the heat pump.
LOOP FILL
Fill loop (valve position A, see Figure 8a) with water from a
garden hose through ush cart before using ush cart pump
to ensure an even ll and increase ushing speed. When
water consistently returns back to the ush reservoir, switch
to valve position B (Figure 8b).
Isolate expansion tank for ushing procedure using the ball
valve. During dead heading of ush cart pump, isolation will
prevent compression of bladder in the expansion tank and
ush cart uid level dropping below available capacity.
Figure 7a: Typical Cleanable Flush Cart Strainer
(100 mesh [0.149 mm])
⚠
WARNING!
⚠
WARNING! Disconnect electrical power source to prevent
injury or death from electrical shock.
Figure 7b: Cam Fittings for Flush Cart Hoses
Attach
to Flow
Controller
Flush Port
Connect
to Flush
Cart Hose
(1 of 2)
NOTICE: A hydrostatic pressure test is required on ALL
piping, especially underground piping before nal backll per
IGSHPA and the pipe manufacturers recommendations.

13
Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
climatemaster.com
Figure 8b: Valve Position B – Unit Fill/Flush
Loop
Valve Position
Out
In
Flushing the Earth Loop, Cont’d.
Flush Port
Front of Unit
Valve Position
Figure 8c: Valve Position C – Full Flush
Loop
Valve Position
Dead Head
Pump Test
for Air
Add Antifreeze
Now if Needed
Out
In
Flush Port
Front of Unit
Valve Position
UNIT FILL
Unit ll valves should be switched to Position B while ush cart
is pumping to ll the unit heat exchanger (see Figure 8b). The
valves position should be maintained until water is consistently
returned into the ush reservoir.
LOOP FLUSH
Switch to valve Position A. The supply water may be shut off
and the ush cart turned on to begin ushing. Once the ush
reservoir is full, do not allow the water level in the ush cart
tank to drop below the pump inlet line or air can be pumped
back out to the earth loop. Try to maintain a uid level in the
tank above the return tee so that air can not be continuously
mixed back into the uid. Surges of 50 psi [345 kPa] can
be used to help purge air pockets by simply shutting off the
ush cart return valve going into the ush cart reservoir. This
process ‘dead heads’ the pump to 50 psi [345 kPa]. To dead
head the pump until maximum pumping pressure is reached,
open the valve back up and a pressure surge will be sent
through the loop to help purge air pockets from the piping
system. Notice the drop in uid level in the ush cart tank. If
all air is purged from the system, the level will drop only 3/8”
(1.2 cm) in a 10” [25.4 cm] diameter PVC ush tank (about
a half gallon [1.9 liters]) since liquids are incompressible. If
the level drops more than this level, ushing should continue
since air is still being compressed in the loop uid. Do this a
number of times.
NOTICE: Actual ushing time require will vary for each
installation due to piping length, conguration, and ush cart
pump capacity. 3/8” (1.2 cm) or less uid level drop is the
ONLY indication that ushing is complete.
Switch valves to Position B to ush the unit. Flush through
the unit until all air pockets have been removed.
Move valves to position C. By switching both valves to this
position, water will ow through the loop and the unit heat
exchanger. Finally, the dead head test should be checked
again for an indication of air in the loop. Fluid level drop is
your only indication of air in the loop.
PRESSURIZE AND OPERATE
As shown in Figure 8d, close the ush cart return valve to
pressurize the loop to at least 50 psi [345 kPa], not to exceed
75 psi [517 kPa]. Open the isolation valve to the expansion
tank and bleed air from the expansion tank piping using the
Schrader valve located in front of the expansion tank. This
will allow loop pressure to compress the expansion tank
bladder, thus charging the expansion tank with liquid. After
pressurizing, close the ush cart supply valve to isolate the
ush cart. Move the Flow Controller valves to Position D.
Loop static pressure will uctuate with the seasons and
pressures will be higher in the winter months than during
the cooling season. This uctuation is normal and should
be considered when charging the system initially. Unhook
the ush cart from the Internal Flow Controller. Install Flow
Controller caps to ensure that any condensation/leakage
remains contained within the Flow Controller package.
If the loop pressure is between 50 and 75 psi [345 to 517
kPa] upon completion of ushing, pressures should be
sufcient for all seasons.

Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
14 Geothermal Heating and Cooling
Flushing the Earth Loop, Cont’d.
Figure 8d: Valve Position D – Pressurize and Operation
Loop
Valve Position
1
Dead Head
Pump to
Pressurize
to 50 PSI
2
Close to isolate
Internal Flow Controller 3
Close Internal
Flow Controller
Valves for
Operation Mode
Out
In
Flush Port
Front of Unit
Valve Position
NOTICE: It is recommended to run the unit in the cooling,
then heating mode for 15-20 minutes each to ‘temper’ the
uid temperature and prepare it for pressurization. This
procedure helps prevent the periodic “at” loop condition of
no pressure.

15
Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
climatemaster.com
Often projects require more than one heat pump. Where
possible, it makes sense for multiple units to share a common
ground loop. Common ground loops for multiple units bring
new challenges including the need to avoid backward ow
through inactive units, increased pumping requirements,
and more complex ushing needs. Three types of multiple
unit systems are described below along with guidelines for
installation of each type.
vFlow® internal variable ow technology is a great assist
for systems with multiple units. vFlow is available in three
different congurations:
1. Internal variable-speed pump
2. Internal modulating valve for closed loops
3. Internal modulating valve for open loops
The internal modulating valve for open loops version should
never be used on closed loops.
The internal variable speed pump version of vFlow includes
an internal variable speed circulator controlled by the
DXM2.5 microprocessor, internal 3-way ushing valves, an
internal bladder type expansion tank, and front-mounted
pressure ports that allow access to the pressure drop across
the coaxial heat exchanger only. The pump curve for the
circulator is shown in Figures 6a-b. The internal expansion
tank will operate as a pressure battery for the geothermal
system. It will absorb uid from the loop when loop pressure
rises and inject uid into the loop when loop pressure falls.
In this way the expansion tank will help to maintain a more
constant loop pressure and avoid at loops due to seasonal
pressure changes in the loop.
When using the internal variable speed pump as the loop
pump in multiple unit installations it is important to ensure
that the variable speed pump can provide adequate ow
through the heat pump against the loop head when all units
are operating.
Units with the standard head pump should not be combined
with units with high head pumps on the same loop. Standard
head pumps are best suited for small applications with a
single unit.
It may be possible to ush a multiple unit system through the
unit’s ushing valves. Flushing pressure drop of the valve may
be calculated to determine if it is acceptable. Engineering data
for the 3-way ushing valves can be found in Table 3.
Table 3: Internal 3-Way Flushing Valve Data
Model Flushing
Connection
Straight Flow
Cv
90°
Flow Cv
TES/P026 - 038 1" FPT 25 10.3
TES/P049 - 064 1" FPT 58 14.5
For example, if a system includes two 2-ton units and four
¾ loop circuits we can calculate the ushing pressure drop
as follows. From Table 2 we know that it will take 4 gpm to
Multiple Unit Piping and Flushing
ush each ¾” circuit. If there is no provision to isolate the
circuits for ushing, we will have to ush with a minimum
of 4 circuits x 4 gpm/circuit = 16 gpm total. A check of other
piping sizes used must be done to ensure that 16 gpm total
ow will ush all piping.
Pressure drop through the ushing valve can be calculated
using the following formula.
ΔP = (GPM/Cv)2where,
ΔP = pressure drop in psi through the valve while ushing
GPM = ushing ow in gallons per minute
Cv = valve Cv in ushing mode
We know from Table 3 that the Cv for the ushing valve in a
TES/P026 is 10.3 in the ushing mode (90° ow). Therefore,
ΔP = (GPM/Cv)2= (16/10.3)2= 2.4 psi per valve (there are
two ushing valves). So long as the ushing pump is able to
provide 16 gpm at the ushing pressure drop of the loop plus
the 2.4 x 2 valves = 4.8 psi of the ushing valves, the internal
ushing valves may be used. If the ushing pump is not able
to overcome the pressure drop of the internal ushing valves,
then larger external ushing valves must be used.
UNIT CONFIGURATION
Multiple vFlow® units with internal variable-speed ow
controller and check valve, piped in parallel sharing a
common loop MUST be congured for ‘VS PUMP PARALLEL’
in Installer Settings Menu.
UNIT CONFIGURATION
CURRENT CONFIG TE026
HEAT PUMP FAMILY TE
HEAT PUMP SIZE 026
BLOWER TYPE ECM
LOOP CONFIG VS PUMP
PARALLEL
SELECT OPTION
PREVIOUS SAVE
TE026
TE
Installer Settings System Cong Unit Cong
Loop Cong
MULTIPLE UNITS w/INTERNAL FLOW CONTROLLERS
The simplest multiple unit system is one with two (or more)
units utilizing internal Flow Controllers with no external pumps
or ushing valves. In this case the units are piped in parallel
and use the internal ushing valves to ush the system. The
variable speed pump includes an internal check valve to
prevent back (short circuiting) ow through the units.
In this case, ush the loop through the internal ushing
valves in the unit farthest from the loop rst. Once the loop is
ushed, then change the internal ushing valves to ush the
heat pump. Next, move the ushing cart to the next closest
unit to the loop.

Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
16 Geothermal Heating and Cooling
Multiple Unit Piping and Flushing, Cont’d.
Again, ush the loop through the internal ushing valves. This is important as there may be air/debris in the lines from this
unit to the common piping. Once ushing begins the air will be moved into the loop and will need to be ushed out. After the
loop is ushed through the second unit, change the ushing valves to ush the second unit. This process should be repeated
for additional units working from the farthest from the loop to the closest to the loop.
This type of application can generally be employed for systems up to 12 tons depending on loop design. However, it is
important to perform appropriate calculations to conrm that the variable speed pump can provide adequate ow through all
heat pumps against the loop head when all units are operating.
Figure 9a: Multiple Units with Internal Flow Controllers
Multiple Units with Internal Flow Controllers
Water Out
Water In
Heat Pump
B
Water Out
Water In
Heat Pump
A
To Ground
Loop
Size for Heat Pump
‘A’ Flow
Size for Heat Pump
‘B’ Flow
Size for ‘A’ + ‘B’ Flow
When the number of units or ushing requirements reaches a point where it is no longer feasible to ush through the internal
valves (generally systems of more than 12 tons depending on loop design), external ushing valves should be installed. In
this case, three-way ushing valves should be used or additional isolation valves must be installed to be able to isolate the
loop during ushing.
Figure 9b: Multiple Units with Internal Flow Controllers and External Flushing Valves
Multiple Units with Internal Flow Controllers and Common Flushing Ports
Water Out
Water In
Heat Pump
B
Water Out
Water In
Heat Pump
A
To Ground
Loop
Water Out
Water In
Heat Pump
C
Indoor Loop
Shut-Off Valve
Ground Loop
Shut-Off Valve
Flush
Valve
Size for Heat Pump
‘A’ Flow Size for ‘A’ + ‘B’ Flow Size for ‘A’ + ‘B’ + ‘C’ Flow
Size for
Heat Pump
‘C’ Flow
Size for
Heat Pump
‘B’ Flow
First, ush the ground loop. The installer should close the indoor loop shut-off valve (or the internal ushing valves in all units)
and open the ground loop shut-off valve to prevent ow through the indoor loop while ushing the ground loop.
Once the ground loop is ushed, close the ground loop shut-off valve and open the indoor loop valve(s) to ush the units and
indoor piping. Remember that there is an internal check valve in the variable speed pump and that backward ow through
the unit is not possible.

17
Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
climatemaster.com
Multiple Unit Piping and Flushing – Indoor Split (TES Only)
MULTIPLE UNITS WITH INTERNAL MODULATING VALVES AND CENTRAL PUMP
This is an application where multiple units are used in conjunction with a central, variable speed pump. In this case, units with
closed loop modulating valves are used (do not use open loop modulating valves on a closed loop system). External ushing
valves are required. This application is for larger systems, including commercial.
Figure 9c: Multiple Units with Internal Modulating Valves and Central Pump
Multiple Units with Internal Modulating Valves and Central Pump
Water Out
Water In
Heat Pump
Water Out
Water In
Heat Pump
To Ground
Loop
Water Out
Water In
Heat Pump Pump
Isolation
Valves
Ground Loop
Shut-Off Valve
Flush
Valve
Pump Exp
Tank
Size for
Heat Pump
‘B’ Flow
Size for Heat Pump
‘A’ Flow Size for ‘A’ + ‘B’ Flow Size for ‘A’ + ‘B’ + ‘C’ Flow
Size for
Heat Pump
‘C’ Flow
Before ushing, the installer should manually open all modulating valves as detailed in Closed Loop – External Central
Pumping section of this manual. Next, ush the ground loop. The installer should close a pump isolation valve and open the
ground loop shut-off valve to prevent ow through the indoor loop while ushing the ground loop.
Once the ground loop is ushed, close the ground loop shut-off valve and open the pump isolation valve to ush the units and
indoor piping. Once the system is ushed remember to return the modulating valves to their normal operating position.

Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
18 Geothermal Heating and Cooling
Ground Loop Heat Pump Applications
ANTIFREEZE SELECTION – GENERAL
In areas where minimum entering loop temperatures drop
below 40°F [4.4°C] or where piping will be routed through
areas subject to freezing, antifreeze is needed. Alcohols
and glycols are commonly used as antifreeze solutions.
Your local representative should be consulted for the
antifreeze best suited to your area. Freeze protection should
be maintained to 15°F [8.5°C] below the lowest expected
entering loop temperature.
Initially calculate the total volume of uid in the piping
system using Table 4. Then use the percentage by volume
shown in Table 5 for the amount of antifreeze. Antifreeze
concentration should be checked from a well mixed sample
using a hydrometer to measure specic gravity.
Table 4: Fluid Volume
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]
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]
Unit Heat Exchanger Typical 1.0 [3.8]
Flush Cart Tank 10” Dia x 3ft tall
[25.4cm x 91.4cm tall] 10 [37.9]
⚠
WARNING!
⚠
WARNING! Always dilute alcohols with water (at least 50%
solution) before using. Alcohol fumes are ammable and
can cause serious injury or death if not handled properly.
When handling methanol (or any alcohol), always wear
eye protection and rubber gloves as alcohols are easily
absorbed through the skin.
Table 5: Antifreeze Percentages by Volume
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
Contact your ClimateMaster distributor if you have any
questions as to antifreeze selection.
⚠
WARNING!
⚠
WARNING! Always use properly marked vehicles (D.O.T.
placards), and clean/suitable/properly identied containers
for handling ammable antifreeze mixtures. Post and
advise those on the jobsite of chemical use and potential
dangers of handling and storage.
NOTICE: DO NOT use automotive windshield washer uid
as antifreeze. Washer uid contains chemicals that will
cause foaming.
⚠
CAUTION!
⚠
CAUTION! Always obtain MSDS safety sheets for all
chemicals used in ground loop applications including
chemicals used as antifreeze.
ANTIFREEZE CHARGING
It is highly recommended to utilize premixed antifreeze uid
where possible to alleviate many installation problems and
extra labor.
The following procedure is based upon pure antifreeze and
can be implemented during the Full Flush procedure with
three way valves in the Figure 8c - Valve Position C. If a
premixed mixture of 15°F [-9.4°C] freeze protection is used,
the system can be lled and ushed with the premix directly
to prevent handling pure antifreeze during the installation.
1. Flush loop until all air has been purged from system and
pressurize to check for leaks before adding
any antifreeze.
2. Run discharge line to a drain and hook up antifreeze
drum to suction side of pump (if not adding below water
level through approved container). Drain ush cart
reservoir down to pump suction inlet so reservoir can
accept the volume of antifreeze to be added.
3. Calculate the amount of antifreeze required by rst
calculating the total uid volume of the loop from Table
4. Then calculate the amount of antifreeze needed using
Table 5 for the appropriate freeze protection level. Many
southern applications require freeze protection because
of exposed piping to ambient conditions.
4. Isolate unit and prepare to ush only through loop (see
Figure 8a). Start ush cart, and gradually introduce the
required amount of liquid to the ush cart tank (always
introduce alcohols under water or use suction of pump
to draw in directly to prevent fuming) until attaining the
proper antifreeze protection. The rise in ush reservoir
level indicates amount of antifreeze added (some carts
are marked with measurements in gallons or liters). A
ten inch [25.4 cm] diameter cylinder, 3 foot [91.4 cm]
tall holds approximately 8 gallons [30.3 liters] of uid
plus the hoses (approx. 2 gallons, [7.6 liters], which
equals about 10 gallons [37.9 liters] total. If more than
one tankful is required, the tank should be drained
immediately by opening the waste valve of the ush
cart noting the color of the discharge uid. Adding food

19
Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
climatemaster.com
-50°F -40°F -30°F -20°F -10°F 0°F 10°F 20°F 30°F 40°F 50°F
0.960
0.965
0.970
0.975
0.980
0.985
0.990
0.995
1.000
Low Temperature Protection
Specific Gravity
-45.6°C
-40°C
-34.4°C
-28.9°C
-23.3°C
-17.8°C
-12.2°C
-6.7°C
-1.1°C
4.4°C
10°C
1.00
1.01
1.02
1.03
1.04
1.05
1.06
1.07
Low Temperature Protection
Specific Gravity
-40°F -30°F -20°F -10°F 0°F 10°F 20°F 30°F 40°F
-40°C -34.4°C -28.9°C -23.3°C -17.8°C -12.2°C -6.7°C -1.1°C 4.4°C
0.975
0.980
0.985
0.990
0.995
1.000
-5°F 0°F 5°F 10°F 15°F 20°F 25°F 30°F 35°F
1.7°C-1.1°C-3.9°C-6.7°C-9.4°C-12.2°C-15.0°C-17.8°C-20.6°C
Low Temperature Protection
Chart 1a: Methanol Specic Gravity
Chart 1b: Propylene Glycol Specic Gravity
Chart 1c: Ethanol Specic Gravity
Ground Loop Heat Pump Applications, Cont’d.
Figure 10: Low Temperature Cutout Selection
P1
Alarm
Relay
Comp
Relay
O
Y1
Y2
W
G
C
R
AL1
24Vdc
EH1
EH2
P6
R
C
Off On
JW3
A
OVR
ESD
C
R
NSB
AL2
JW1
Acc1
Relay
Acc2
Relay
H
COM
NC1
NO1
COM
NC2
NO2
P3
CO
RV
RV
LT1
LT1
LT2
LT2
LP
LP
HP
HP
P7
Status
Fault
R
R
CC
CCG
CO
S1
S2
1
12
1
4
Factory Use
(240Vac)
Com
N.O.
Fan Enable
5 1/2"
7" 6 1/2"
5"
Use 4 mounting screws
#6 sheet metal screw 1” long
1.5
3/8” standoff
Factory low
voltage Molex
connection for
unit harness
Factory low
voltage Molex
connection for
electric heat
harness
Micro
U1
Off On
P2
COH
COM
AO2
P11
Gnd T1
P10
T2 T2 T3 T3 T4 T4 T5
P9
T5 T6 T6
A0-1 A0-2
Off On
S3
RV
Relay
CCH
Relay
Test
P5
B-
Gnd
P4
A+ 24V
(240Vac)
Fan Speed
N.O.
N.C.
12V
OUT
Gnd
P8
IN
NC
P12
Note: There is only
one T1 connection
1 2 3 4
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
AO1
Gnd
1
DXM2.5 PCB
JW3-LT1 jumper should be clipped for low temperature
operation. Do not clip JW3-LT1 in open loop applications
coloring to the antifreeze can help indicate where the
antifreeze is in the circuit and prevents the dumping of
antifreeze out the waste port. Repeat if necessary.
5. Be careful when handling methanol (or any alcohol).
Always wear eye protection and rubber gloves. The
fumes are ammable, and care should be taken with all
ammable liquids. Open ush valves to ush through
both the unit and the loop and ush until uid is
homogenous and mixed. It is recommended to run the
unit in the heating and cooling mode for 15-20 minutes
each to ‘temper’ the uid temperature and prepare it
for pressurization. Devoting this time to clean up can be
useful. This procedure helps prevent the periodic “at”
loop condition.
6. Close the ush cart return valve; and immediately
thereafter, close the ush cart supply valve, leaving
a positive pressure in the loop of approximately 50
psi [345 kPa]. This is a good time to pressure check
the system as well. Check the freeze protection of
the uid with the proper hydrometer to ensure that
the correct amount of antifreeze has been added to
the system. The hydrometer can be dropped into the
ush reservoir and the reading compared to Chart
1a for Methanol, 1b for Propylene Glycol, and 1c for
Ethanol to indicate the level of freeze protection. Do
not antifreeze more than a +10°F [-12.2°C] freeze
point. Specic gravity hydrometers are available in the
residential price list. Repeat after reopening and ushing
for a minute to ensure good second sample of uid.
Inadequate antifreeze protection can cause nuisance low
temperature lockouts during cold weather.
⚠
WARNING!
WARNING! Always dilute alcohols with water (at least 50%
solution) before using. Alcohol fumes are ammable and
can cause serious injury or death if not handled properly.
When handling methanol (or any alcohol), always wear
eye protection and rubber gloves as alcohols are easily
absorbed through the skin.
7. Close the ush cart return valve; immediately thereafter,
close the ush cart supply valve, shut off the ush cart
leaving a positive pressure in the loop of approximately
50-75 psi [345-517 kPa]. Refer to Figure 8d for more
details.
LOW WATER TEMPERATURE CUTOUT SETTING –
DXM2.5 CONTROL
When antifreeze is selected, the LT1 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).

Tranquility®Digital Split - 60Hz HFC-410A
Rev.: October 18, 2022
20 Geothermal Heating and Cooling
High and Low
Voltage Knockouts
Vibration Isolation Pad
To Thermostat
Internal
Motorized
Modulating
Valve
Water Out
Water In
Closed Loop - External Central Pumping Applications
(Indoor Split TES Only)
Figure 11: Typical Closed Loop with Central Pumping Application (with Internal Modulating Motorized Valve Shown)
Tranquility®Digital units are available with a modulating
water valve option for closed-loop applications with external
central pumping (designated by a 5 in the 11th position of
the unit model number). With this option, the Modulating
Valve is regulated by the Communicating DXM2.5 board
based on entering and leaving water temperature (ΔT). The
DXM2.5 board outputs a 0-10v signal to determine valve
position (ow rate). The modulating valve defaults to closed
position if it loses signal but still has 24V power running to it.
If the motorized modulating valve loses both signal from the
DXM2.5 board AND 24V power, it will remain in the same
position it was in when it lost 24V power.
NOTE: The Cv (ow coefcient) of the valve used in these
units is DIFFERENT than the Cv of the valve used in the open
loop unit. It is not advisable for use in open loop applications
as sound/noise issues may result. Units with the water circuit
for closed loop, central pumping option are only available
with a copper water coil.
To manually open the internal modulating motorized water
valve in TES026 – 049 push down on the handle to unlock
it. Then rotate the handle to the open position as shown
in Figure 12. This fully opens the valve for ushing. Once
ushing is complete, return the valve handle to its normally
closed position.
To manually open the internal modulating motorized water
valve in TES064, push down on the lock release button while
turning the handle to the open position as shown in Figure
12. This fully opens the valve for ushing. Once ushing is
complete, press the lock release again and return the valve
handle to its normally closed position.
Figure 12: Internal Modulating Motorized Valve Positions
Lock Release
Lock Release
Sizes 026-049 Size 064
Closed Closed
Open Open
Lock Release