Nibe ClimateMaster Tranquility 22 Digital TZ... Guide

Table of Contents
Model Nomenclature 3
Safety 4
General Information 5
Vertical Installation 6
Horizontal Installation 7
Condensate and Water Connection 10
vFlow®Heat Pump Applications Overview 11
Closed Loop Heat Pump Applications
w/Internal Flow Controller 12
Flushing the Earth Loop 14
Multiple Unit Piping and Flushing 17
Ground-Loop Heat Pump Applications 20
Closed Loop – External Central
Pumping Applications 22
Open Loop or Ground-Water Heat
Pump Applications 23
Water Quality Requirements 25
Hot Water Generator 29
Electrical – Line Voltage 32
Electrical – Low Voltage Wiring 33
Electrical – Thermostat Wiring
and Auxiliary Heat 34
Wiring Diagrams 35
Constant Volume (CV) ECM 37
Blower Performance Data 40
Controls – DXM2.5 41
Operating & Commissioning Limits 42
Unit & System Checkout 43
Unit Start-Up Procedure 44
Unit Operating Conditions 46
Performance Data 47
Preventive Maintenance 61
Troubleshooting 62
DXM2.5 Functional Troubleshooting Flow Chart 64
Functional Troubleshooting 65
Performance Troubleshooting 67
Troubleshooting Form 69
Warranty 70
Revision History 72
Tranquility®22 Digital
(TZ) Series
97B0072N11
Residential Horizontal & Vertical
Packaged Geothermal Heat Pumps
Installation, Operation &
Maintenance Instructions
Rev.: November 18, 2022

2Geothermal Heating and Cooling
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
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Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Model Nomenclature: General Overview
NOTE: Above model nomenclature is a general reference. Consult individual specication sections for detailed information.
D = Current Revision
0 2 4 DG 0 2 C V T
456 7
8
9 10 11 12 13 14
024
030
036
042
048
060
UNIT SIZE
RETURN AIRFLOW CONFIGURATION
VOLTAGE
CONTROLS
D = DXM2.5
B = DXM2.5 w/Disconnect
REVISION LEVEL
HEAT EXCHANGER OPTIONS
SUPPLY AIRFLOW &
MOTOR CONFIGURATION
TZ
1 2
TZ = Tranquility®22 Digital
SERIES
V
3
V = Vertical Up
H = Horizontal
CONFIGURATION
WATER CIRCUIT OPTIONS
S
15
S = Standard
STANDARD
S = Left Return w/ stainless steel drain pan
T = Right Return w/ stainless steel drain pan
D
Supply Configuration
K TZV
P TZH
W TZH
Top
Back
Straight
Motor
ECM
ECM
ECM
G = 208-230/60/1
0 = None
1 = Internal Flow Controller Standard Head w/ check valve – Closed Loop
(available for unit sizes 024 to 036 only)
A = Internal Flow Controller Standard Head w/o check valve – Closed Loop
(available for unit sizes 024 to 036 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
CABINET
0 = Residential w/ 1” Merv 8 pleated
filter and frame
Tin Plated Air Coil
No HWG
HWG W/Pump (Standard)
A
L
J
M
Copper Cupro-Nickel
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.

4Geothermal Heating and Cooling
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Safety
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.
⚠
CAUTION!
⚠
⚠
WARNING!
⚠
⚠
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! All refrigerant discharged from this unit must
be recovered WITHOUT EXCEPTION. Technicians must
follow industry accepted guidelines and all local, state,
and federal statutes for the recovery and disposal of
refrigerants. If a compressor is removed from this unit,
refrigerant circuit oil will remain in the compressor. To
avoid leakage of compressor oil, refrigerant lines of the
compressor must be sealed after it is removed.
SAFETY
Warnings, cautions and notices appear throughout this
manual. Read these items carefully before attempting any
installation, service, or troubleshooting of the equipment.
DANGER: Indicates an immediate hazardous situation, which
if not avoided will result in death or serious injury. DANGER
labels on unit access panels must be observed.
WARNING: Indicates a potentially hazardous situation, which
if not avoided could result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation or an
unsafe practice, which if not avoided could result in minor or
moderate injury or product or property damage.
NOTICE: Notication of installation, operation or maintenance
information, which is important, but which is not hazard-
related.
⚠
WARNING!
⚠
WARNING! The EarthPure®Application and Service
Manual should be read and understood before attempting
to service refrigerant circuits with HFC-410A.
⚠
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
The following warning complies with State of California law,
Proposition 65.

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Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
General Information
⚠ CAUTION! ⚠
⚠ 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 heat pumps.
INSPECTION
Upon receipt of the equipment, carefully check the shipment
against the bill of lading. Make sure all units and accessories
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 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, ttings, and valves before installing any of
the system components. Remove any dirt or debris found in
or on these components.
PRE-INSTALLATION
Installation, Operation, and Maintenance instructions are
provided with each unit. Horizontal equipment is designed for
installation above false ceiling or in a ceiling plenum. Other
unit congurations are typically installed in a mechanical
room. The installation site chosen should include adequate
service clearance around the unit. Before unit start-up,
read all manuals and become familiar with the unit and its
operation. Thoroughly check the system before operation.
PREPARE UNITS FOR INSTALLATION AS FOLLOWS:
1. Compare the electrical data on the unit nameplate with
ordering and shipping information to verify that the
correct unit has been shipped.
2. Keep the cabinet covered with the original packaging
until installation is complete and all plastering, painting,
etc. is nished.
3. Verify refrigerant tubing is free of kinks or dents and that
it does not touch other unit components.
4. Inspect all electrical connections. Connections must be
clean and tight at the terminals.
5. Remove any blower support packaging (water-to-air
units only).
6. Locate and verify any hot water generator (HWG),
hanger, or other accessory kit located in the compressor
section or blower section.
CAUTION! DO NOT store or install units in corrosive
environments or in locations subject to temperature or
humidity extremes (e.g., rooftops, etc. See Tables 12a
and 12b for acceptable temperature ranges). Corrosive
conditions and high temperature or humidity can
signicantly reduce performance, reliability, and service
life. Always move and store units in an upright position.
Tilting units on their sides may cause equipment damage.
INSTALLATION BEST PRACTICES
The installation of geothermal heat pump units and all
associated components, parts and accessories which
make up the GHP system 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.
DUCT SYSTEM INSTALLATION
The duct system should be sized to handle the design
airow quietly. Refer to Figure 6a and 6b for horizontal duct
system details or Figure 2 for vertical duct system details.
A exible connector is recommended for both discharge
and return air duct connections on metal duct systems to
eliminate the transfer of vibration to the duct system. To
maximize sound attenuation of the unit blower, the supply
and return plenums should include internal berglass duct
liner or be constructed from duct board for the rst few
feet. Application of the unit to uninsulated ductwork in an
unconditioned space is not recommended, as the unit’s
performance will be adversely affected.
At least one 90° elbow should be included in the supply
duct to reduce air noise. If air noise or excessive air ow is
a problem, the blower speed can be changed. For airow
charts, consult catalog specications for the series and
model of the specic unit.
If the unit is connected to existing ductwork, a previous
check should have been made to insure that the ductwork
has the capacity to handle the airow required for the
unit. If ducting is too small, as in the replacement of a
heating only system, larger ductwork should be installed.
All existing ductwork should be checked for leaks and
repaired as necessary.

6Geothermal Heating and Cooling
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Vertical Installation
VERTICAL UNIT LOCATION
Packaged units are 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 the unit from the installed location.
Vertical units are typically installed in a mechanical closet
or basement. 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).
Also, provide sufcient room to make water, electrical, and
duct connection(s).
If the unit is located in a conned space, such as a closet,
provisions must be made for return air to freely enter the
space by means of a louvered door or other method. 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 Figures 1 and 2 for typical installation
illustrations. Refer to unit catalog specications for
dimensional data.
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 inches [10 mm] to 1/2 inches
[13 mm] in thickness. Extend the pad beyond all four
edges of the unit.
2. Do not block lter access with piping, conduit or other
materials. Refer to unit catalog specications for
dimensional data.
3. Provide access to water valves and ttings and
screwdriver access to the unit side panels, discharge
collar and all electrical connections.
Figure 1: Vertical Unit Mounting
bloque o del ladrillo o sacado
Cojín del aire o sacado
Bloque o ladrillo concreto
Air Pad or extruded
polystyrene insulation board
Figure 2: Typical Vertical Unit Installation Using
Ducted Return Air
Flexible canvas duct
connector to reduce
noise and vibration
Use turning vanes in
supply transition
Internally insulate supply
duct for first 3.9 feet (1.2 m)
each way to reduce noise
Internally insulate return
transition duct to reduce
noise
Rounded return
transition
Flexible canvas duct
connector to reduce
noise and vibration
Use turning vanes in
supply transition
Internally insulate return
transition duct to reduce
noise
Rev.: 6/2/09S
Internally insulate supply
duct for the first 4’ (1.2m)
each way to reduce noise
Rounded return
transition
Remove supply duct
flanges from inside blower
compartment and install
on supply air opening of
unit. Do not use a supply
air plenum/duct smaller
than the size of the supply
duct flanges.
Remove supply duct
flanges from inside blower
compartment and install
on supply air opening of
unit. Do not use a supply
air plenum/duct smaller
than the size of the supply
duct flanges.
SOUND ATTENUATION FOR VERTICAL UNITS
Sound attenuation is achieved by enclosing the unit within a
small mechanical room or a closet. Additional measures for
sound control include the following:
1. If free return, mount the unit so that the return air inlet
is 90° to the return air grille (refer to Figure 3). Install a
sound bafe as illustrated to reduce line-of sight sound
transmitted through return air grilles.
2. Mount the unit on a Tranquility®Unit Isolation Pad to
minimize vibration transmission to the building structure.
For more information on Tranquility Unit Isolation Pads,
contact your distributor.
Figure 3: Vertical Sound Attenuation
Return
Air Inlet

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Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Horizontal Installation
Figure 4: Hanger Bracket
HORIZONTAL UNIT LOCATION
Packaged units are 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 from the ceiling. Horizontal
units are typically installed above a false ceiling or in a ceiling
plenum. 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
the lter and access panels. Provide sufcient room to make
water, electrical, and duct connection(s).
If the unit is located in a conned space, such as a closet,
provisions must be made for return air to freely enter the
space by means of a louvered door or any other method.
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 Figures 7a and 7b for an illustration of a
typical installation. Refer to unit catalog specications for
dimensional data.
Conform to the following guidelines when selecting a
unit location:
1. Provide a hinged access door in concealed-spline or
plaster ceilings. Provide removable ceiling tiles in T-bar
or lay-in ceilings. Refer to horizontal unit dimensions for
specic series and model in unit catalog specications.
Size the access opening to accommodate the service
technician during the removal or replacement of the
compressor, control, or blower assembly.
2. Provide access to hanger brackets, water valves and
ttings. Provide screwdriver clearance to access panels,
discharge collars and all electrical connections.
3. DO NOT obstruct the space beneath the unit with
piping, electrical cables and other items that prohibit
future removal of components or the unit itself.
4. Use a manual portable jack/lift to lift and support the
weight of the unit during installation and servicing.
MOUNTING HORIZONTAL UNITS
Horizontal units have 4 hanger brackets partially attached
at the factory, one at each corner. Enclosed within the unit
there is a hanger kit hardware bag containing vibration
isolation grommets, washers, screws and a hanger installation
instruction page. One additional screw from the hardware bag
must be added to each hanger bracket before unit installation.
Tighten each screw to 75 in-lbs (8.5 Nm). See Figure 1. Refer
to the hanger installation instruction page contained in the
hardware bag for details of nal hanger bracket attachment
and unit suspension. See Figure 1a.
Use four (4) eld supplied threaded rods and factory provided
vibration isolators to suspend the unit. Safely lift the unit into
position supporting the bottom of the unit. Ensure the top of
the unit is not in contact with any external objects. Connect
the top end of the 4 all-thread rods, slide rods through the
brackets and grommet then assemble washers and double
nuts at each rod. Ensure that the unit is approximately level
and that the threaded rod extends past the nuts.
Pitch the unit toward the drain as shown in Figure 6 to
improve the condensate drainage. On small units (less than
2.5 Tons/8.8 kW) ensure that unit pitch does not cause
condensate leaks inside the cabinet.
NOTE: The top panel of a horizontal unit is a structural
component. The top panel of a horizontal unit must never
be removed from an installed unit unless the unit is properly
supported from the bottom. Otherwise, damage to the unit
cabinet may occur.
VIEW CONDENSATE END
BEFORE GROMMET AND HARDWARE
(Unit pictured for hanger bracket reference).
(Drain hardware may vary per unit model)
INSTALLED
AT FACTORY
ADD
BEFORE
HANGING
Figure 4a:
VIEW WATER CONNECTION END
FULLY ASSEMBLED
(Unit pictured for hanger bracket reference)
(Water hardware may vary per unit model)
ADD
BEFORE
HANGING

8Geothermal Heating and Cooling
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Drain
Connection
1/4” (6.4mm) pitch
toward drain for drainage
Figure 5: Horizontal Unit Pitch
Horizontal Installation, Cont’d.
AIR COIL
To obtain maximum performance, the air coil should be
cleaned before start-up. A 10% solution of dishwasher
detergent and water is recommended for both sides of
the coil. A thorough water rinse should follow.
HORIZONTAL INSTALLATION
(by others)
(by others)
Unit Power
Disconnect
Power Wiring
Return Air
Supply Air
Unit Hanger
3/8" [10mm] threaded rods
Unit Power
Flexible Duct
Connector
Figure 3: Typical Horizontal Unit Installation with Internal Flow Controller
Flush
Ports
Water
Pressure Ports
Internal
Variable-Speed
Pump
Insulated supply duct with
at least one 90 deg elbow
to reduce air noise
W
ater Out
W
ater In
Figure 6a: Typical Closed Loop Horizontal
Unit Installation (with Internal Flow
Controller)
Figure 6b: Typical Ground Water
Horizontal Unit Installation (with Internal
Motorized Modulating Valve)
Pressure
Tank
HORIZONTAL INSTALLATION
(by others)
Ball Valves
Power Wiring
Insulated supply duct with
at least one 90 deg elbow
to reduce air noise
Return Air
Supply Air
3/8" [10mm] threaded rods
Unit Power
Figure 3: Typical Horizontal Unit Installation with Internal Motorized Modulating Valve
Internal Motorized
Modulating Valve
Water
Pressure Ports
Boiler
Drains
Water
Out
Water In
(by others)
Unit Power
Disconnect
Flexible Duct
Connector
Unit Hanger
(by others)
Unit Power
Disconnect
(by others)
Power Wiring
Supply Air
3/8" [10mm] threaded rods
Unit Power
Flexible Duct
Connector
Unit
Hanger
Platform
Return
Duct
Flexible Duct
Connector
Thermostat
Wiring
TE HORIZONTAL INSTALLATION
Use turning vanes
or a double
radius elbow
Vibration
Isolation Pad
Insulated supply duct with
at least one 90 deg turn
to reduce air noise
Secondary
Drain Pan
Figure 6: Horizontal Unit Mounting

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Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Water
Connection End
Return Air
Remove Screws
Water
Connection End
Return Air
Rotate
Move to Side
Side Discharge
Return Air
Water
Connection End
Discharge Air
Drain
Back Discharge
Replace Screws
Extremo de Con
Conducto de Alimentación
Retorno de Aire
Extremo de Conexión de Agua
Drenaje
Retorno de Aire
Descarga de Aire
Descarga Lateral
Water
Connection End
Supply Duct
Return Air
Water
Connection End
Drain
Return Air
Discharge Air
Side Discharge
Back Discharge
Horizontal Installation, Cont’d.
Figure 8: Right Return Side to Back
Figure 7: Left Return Side to Back
Field Conversion of Air Discharge
OVERVIEW
Horizontal units can be eld converted between side (straight)
and back (end) discharge using the instructions below.
NOTE: It is not possible to field convert return air
between left or right return models due to the
necessity of refrigeration copper piping changes.
PREPARATION
It is best to eld convert the unit on the ground before
hanging. If the unit is already hung it should be taken down
for the eld conversion.
SIDE TO BACK DISCHARGE CONVERSION
1. Place unit in well lit area. Remove the screws as shown
in Figure 8 to free top panel and discharge panel.
2. Lift out the access panel and set aside. Lift and rotate
the discharge panel to the other position as shown,
being careful with the blower wiring.
3. Check blower wire routing and connections for tension
or contact with sheet metal edges. Reroute if necessary.
4. Check refrigerant tubing for contact with
other components.
5. Reinstall top panel and screws noting that the location
for some screws will have changed.
6. Manually spin the fan wheel to ensure that the wheel is
not rubbing or obstructed.
7. Replace access panels.
BACK TO SIDE DISCHARGE CONVERSION
If the discharge is changed from back to side, use above
instruction noting that illustrations will be reversed.
LEFT VS. RIGHT RETURN
It is not possible to eld convert return air between left or right
return models due to the necessity of refrigeration copper
piping changes. However, the conversion process of side to
back or back to side discharge for either right or left return
conguration is the same. In some cases, it may be possible to
rotate the entire unit 180 degrees if the return air connection
needs to be on the opposite side. Note that rotating the unit
will move the piping to the other end of the unit.

10 Geothermal Heating and Cooling
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Condensate and Water Connection
⚠ CAUTION! ⚠
CAUTION! Ensure condensate line is pitched toward drain
1/8 inch per ft [11 mm per m] of run.
CONDENSATE PIPING
Pitch the unit toward the drain as shown in Figure 6 to
improve the condensate drainage. On small units (less than
2.5 tons/8.8 kW), insure that unit pitch does not cause
condensate leaks inside the cabinet.
Install condensate trap at each unit with the top of the trap
positioned below the unit condensate drain connection as
shown in Figure 9. Design the depth of the trap (water-seal)
based upon the amount of External Static Pressure (ESP)
capability of the blower (where 2 inches [51 mm] of ESP
capability requires 2 inches [51 mm] of trap depth). As a
general rule, 1-1/2 inch [38 mm] trap depth is the minimum.
Each unit must be installed with its own individual trap and
connection to the condensate line (main) or riser. Provide
a means to ush or blow out the condensate line. DO NOT
install units with a common trap and/or vent.
Always vent the condensate line when dirt or air can collect
in the line or a long horizontal drain line is required. Also vent
when large units are working against higher external static
pressure than other units connected to the same condensate
main since this may cause poor drainage for all units on the
line. WHEN A VENT IS INSTALLED IN THE DRAIN LINE, IT
MUST BE LOCATED AFTER THE TRAP IN THE DIRECTION
OF THE CONDENSATE FLOW.
Figure 9: Condensate Connection
2”
1.5”
1.5”
1/8” Per
Foot
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!
Figure 10: Water Connections
Gasket
Swivel Nut
Stainless steel
snap ring
Brass Adaptor
Hand Tighten
Only!
Do Not
Overtighten!
⚠
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.

11
climatemaster.com
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
vFlow®Heat Pump Applications OverviewvFlow®Heat Pump Applications Overview
⚠
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.
vFlow® is a revolutionary new, intelligent, and efcient way
to circulate water (or water plus antifreeze) using INTERNAL,
variable water ow control. The factory-installed high-
efciency variable-speed pump uses 60%-80% less wattage
than a traditional xed speed pump. vFlow technology
improves performance of the unit by reducing the amount
of energy required to optimize the ow of water throughout
a GHP System and also reduces the space, cost, and labor
required to install external water ow control mechanisms
(ow controllers, solenoid and ow control valves).
vFlow® Configurations
(Model Digit 11 must be 1, 2, 5, or 6):
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
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.
Figure 11a: Typical Closed-Loop Application
(with Internal Flow Controller Shown)
High and
Low Voltage
Knockouts
Vibration Isolation Pad
To Thermostat
Internal Flow
Controller
Water In
Water Out
Figure 11b: Typical Open-Loop Application
(with Internal Modulating Motorized Valve Shown)
For use on applications using external source for ow
Internal Motorized
Modulating Valve
Water Out
Shut Off
Ball Valves
for Isolation
Water In
Pressure
Tank
Optional
Filter
Boiler
Drains

12 Geothermal Heating and Cooling
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
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). For operation outside of the normal
entering water temperature range (50° or 60°F - 110°F
for cooling, 30°F-70°F for heating) the DXM2.5 controller
may automatically adjust the control ΔT to account for
the abnormal entering water temperatures, maintaining
an appropriate ow rate for proper unit operation. When
entering water temperatures are abnormally low for cooling,
or abnormally high for heating, the DXM2.5 controller will
maintain a constant leaving water temperature 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
Figures 6a and 11a. 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.
⚠ 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).
Figure 12: Internal Flow Controller
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 10) in this
manual will determine the ow rate through the unit.
Digital Tire Pressure Gauge

13
climatemaster.com
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
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 13: Standard Head Variable Pump Performance
Figure 13a: 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

14 Geothermal Heating and Cooling
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Flushing the Earth Loop
⚠ WARNING! ⚠
WARNING! Disconnect electrical power source to prevent
injury or death from electrical shock.
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 1 for ow rate required to attain 2 fps [0.6 m/s]. The
steps below must be followed for proper ushing.
Table 1: Minimum Flow Required to Achieve 2 ft/sec variety
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 15a) 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 (gure 15b).
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 14a: Typical Cleanable Flush
Cart Strainer (100 mesh [0.149 mm])
Figure 14b: 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 final backfill
per IGSHPA and the pipe manufacturers recommendations.
Figure 15a: Valve Position A – Loop Fill/Flush
Loop
Out
In
Valve Position
Flush Port
Front of Unit
Valve Position

15
climatemaster.com
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Flushing the Earth Loop, Cont’d.
Figure 15b: Valve Position B – Unit Fill/Flush
Loop
Valve Position
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
15b). 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 inches in a 10 inches [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, configuration, and ush
cart pump capacity. 3/8 inches 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.
Figure 15c: 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
PRESSURIZE AND OPERATE
As shown in Figure 15d, 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.

16 Geothermal Heating and Cooling
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Flushing the Earth Loop, Cont’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.
Figure 15d: 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.

17
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Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Multiple Unit Piping and Flushing
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 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 2.
Table 2: Internal 3-Way Flushing Valve Data
Model Flushing
Connection
Straight
Flow Cv
90°
Flow Cv
TZ024 - 042 3/4" FPT 25 10.3
TZ048 - 060 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 1 we know that it will take 4 gpm to
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 tat 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 2 that the Cv for the ushing valve in
a TZ024 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 024
BLOWER TYPE ECM
LOOP CONFIG VS PUMP
PARALLEL
SELECT OPTION
PREVIOUS SAVE
TZ024
TZ
Installer Settings System Cong Unit Cong
Loop Cong

18 Geothermal Heating and Cooling
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
MULTIPLE UNITS WITH 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.
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 move 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 to 12 tons depending on loop design. However, it is important
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 16a: 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
MULTIPLE UNITS WITH INTERNAL FLOW CONTROLLERS AND EXTERNAL FLUSHING VALVES
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.
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 the unit is
not possible.
Multiple Unit Piping and Flushing, Cont’d.

19
climatemaster.com
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
Multiple Unit Piping and Flushing, Cont’d.
Figure 16b: 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
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.
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.
Figure 16c: 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

20 Geothermal Heating and Cooling
Tranquility®22 Digital (TZ)Series - 60Hz
Rev.: November 18, 2022
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 3. Then use the percentage by volume
shown in Table 4 for the amount of antifreeze. Antifreeze
concentration should be checked from a well mixed sample
using a hydrometer to measure specic gravity.
Table 3: 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]
Fluid Cooler 036/060 7.4 [28]
Flush Cart Tank 10” Dia x 3 ft tall
[25.4 cm x 91.4 cm 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 4: 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 21% 17% 13% 8%
Propylene Glycol 29% 24% 18% 12%
Ethanol* 23% 20% 16% 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 job site 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 15c - 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
3. Then calculate the amount of antifreeze needed using
Table 4 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 15a). 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