Trane FLEX HP HT Owner's manual

Page 1
Installation
Operation
Maintenance
July 2022 CG-SVX059A-GB
Original instructions
FLEX HP HT
Air
-cooled heat pump with vapour injection scroll compressors
R410A refrigerant
F
or hot water production up to 65°C
Cooling
capacity 50 – 144 kW
Heating
capacity 54 – 154 kW

Page 2

Page 2
Contents
1. OVERVIEW ............................................................................................................................... 3
2. SAFETY REGULATIONS .......................................................................................................... 3
3. OPERATING LIMITS................................................................................................................. 8
4. INSTALLATION ......................................................................................................................... 9
5. ELECTRICAL POWER SUPPLY............................................................................................. 10
6. WATER CONNECTIONS ........................................................................................................ 12
7. HYDRAULIC VERSIONS ........................................................................................................ 17
8. PUMPS CHARACTERISTICS ................................................................................................. 20
9. ELECTRICAL PANEL AND ELECTRICAL DATA.................................................................... 23
10. OPERATOR RESPONSABILITIES ...................................................................................... 26
11. START-UP PRELIMINARY PROCEDURES........................................................................ 26
12. CHECK LIST – MANDATORY OPERATION CONTROL BEFORE START-UP .................. 27
13. START-UP ........................................................................................................................... 32
14. MAINTENANCE ................................................................................................................... 34
15. ORDINARY MAINTENANCE ............................................................................................... 38
16. RECOMMENDED SPARE PARTS ...................................................................................... 39
17. TROUBLESHOOTING ......................................................................................................... 40

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1. OVERVIEW
FOREWORD
These instructions are given as a guide to good practice in the installation, start-up, operation, and maintenance by the
user of FLEX HP HT units. They do not contain full service procedures necessary for the continued successful operation of
this equipment. The services of a qualified technician should be employed through the medium of a maintenance contract
with a reputable service company. Read this manual thoroughly before unit start-up.
a. WARRANTY
-The warranty for Trane machines is 12 months from the date the machine is operated for the first time but no more than
18 months from the date of the invoice. The warranty is reduced to 6 months from the start up date for units running
continuously, that is more than 12 hours a day. The date the machine is operated for the first time means the date reported
in the “1st start up form” in the “log book”. This form should be filled in and sent, within 8 days from the start up, to Trane.
-The warranty is valid if all the installation regulations have been adhered to (both those which may have come from
Trane and those coming from current practice), if the “1st start up form” has been filled in and sent to the Trane after sales
department.
-The warranty is subject to any faults or defects being reported within eight days from their discovery. The warranty will
only be applied if and when the purchaser suspends use of the equipment as soon as a defect has been found.
Replacement items are to be considered always ex TRANE factory. Labour costs to replace failed items either under
warranty or not, will be not of TRANE care.
-The warranty is valid if the first running of the machine is carried out by a Trane authorised assistance centre.
-The warranty is subject to regular maintenance of the unit which is appropriately indicated in the “machine log
book” located inside the electrical panel.
-The warranty is automatically over in case of payments not fulfilled, non-performance of the contract and even if the
units show tampering without TRANE writing approvals.
-Non observance of the above mentioned rules and of all the indications written on this manual, will cause the immediate
loss of warranty, getting free TRANE from any responsibility for the unit and any damages to persons or things.
b. RECEIVING THE UNIT
Once received the unit, it is up to the customer to check that there is no obvious damage or pieces missing. If this is so, an
immediate complaint must be made to the carrier for damage or for not-delivery. Photographic evidence must be provided
for macroscopic damage. The card must be sent to Trane within 8 days of receiving the goods: if it is not sent back or
delayed, the complaint will not be accepted.
c. FACTORY INSPECTION
Trane units are inspected into the factory, in appropriate areas, in accordance with internal procedures. Each performance
test carried out on the unit is possible only if the same conditions are reproduced and maintained (charge consistency,
constant temperature and evaporation - condensation and recovery capacity, quality and tolerance of the measuring
instruments etc.) in the test rooms.
The inspection conditions are those indicated by the customer in the ordering phase: if not otherwise specified, reference
should be made to the nominal performance indicated in the technical bulletin in force at the date of the Confirmation of the
Order.
2. SAFETY REGULATIONS
All Trane units are designed, built and inspected in compliance with Pressure Equipment Directive (PED97/23/EC or
2014/68/EU and Machinery Directive 2006/42/EC.

Page 4
a. DEFINITIONS
Owner:
The legal representative of the company, body or natural person who owns the plant in which the unit is installed:
he or she is responsible for the control and respect of all the safety regulations indicated in this manual as well as
the national ones in force.
Installer:
The legal representative of the company appointed by the owner to position and hydraulically, electrically etc.
connect the unit to the plant: he or she is responsible for moving and the correct installation of the unit in
accordance with the indications in this manual and with the national regulations in force.
Operator:
A person authorized by the owner to carry out all the operations of regulation and control on the unit which are
specifically mentioned in this manual. He or she should keep to actions described in the manual and limit his or her
action to what is explicitly allowed.
Technician:
A person who is directly authorized by Trane or, secondarily, for all EU countries except for Italy, by the distributor
of the Trane product, under their own responsibility, to carry out all ordinary or extraordinary maintenance
operations, as well as regulations, controls, repairs and parts replacement which may be necessary during the
lifetime of the unit.
b. ACCESS TO DANGEROUS AREA
The access to the unit dangerous areas is usually obstructed through protection panels, which are removable, by
using a tool. Axial fans are protected with accident prevention grilles.
For all the units which allow access to the cooling piping without security gratings (optional) or closing panelling,
the following precautions must be taken:
-mark the areas with contact risks.
-apply warning signs.
The danger zone must be of a suitable size to avoid any contact, even accidental contact.
Trane declines any responsibility for damage to things and unauthorized personnel in case of absence of clear
and static limiting systems of the risk areas and of the relevant warning and danger signs.
c. GENERAL PRECAUTIONS
The operator must only intervene on the unit commands; he or she must not open any panels except for the one
which gives access to the control module.
The installer must only intervene on the connections between the plant and the machine; he or she must not open
any panels nor carry out any commands.
The following precautions should be made when approaching or working on the unit:
-Do not wear jewelry, baggy clothes or any other accessory which can get caught up.
-Use appropriate protection (gloves, glasses etc.) when using an open flame (welding) or compressed air.
-If the unit is located in a closed environment, wear hearing protection.
-Before disconnecting, removing tubes, filters, joints or other line parts intercept the connection tubes, empty
them until the pressure reaches that of the atmosphere.
-Do not use your hands to check for possible pressure losses.
-Always use tools which are in good condition; make sure the instructions have been fully understood before usingthem.
-Make sure that any tools, electrical cables or other loose objects have been removed before closing the unit
and starting it up again.
d. PRECAUTIONS AGAINST RISKS DUE TO THE REFRIGERANT
Safety data
Toxicity
Not important
Risks for skin touching
Splashes or sprinkles can cause chill burns. The risk of absorptions through the skin is not relevant.
The
R410a refrigerant could take some lightly irritating effects and in liquid stage it has a strong skinning effect. In this case
it is necessary to rinse with fresh water the contaminated parts of the skin
The refrigerant in liquid stage in contact with wet
fabrics cause freezing and adherence to the skin. In this case it is
necessary to put off the contaminated clothes to avoid freezing. Please contact a doctor in case of irritation of the
contaminated parts.

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Risks for contact with the
eyes
Vapors
don’t take any effect. Splashes or sprinklers can cause chill burns. In those cases it is necessary to
rinse
the eyes with water or with solution for ocular washings for 10 minutes. The intervention of a doctor is needed.
Risks for ingestion
Should it
happen, it causes chill burns. It does not cause vomiting. The person must be kept awake. It is needed to rinse the
mouth with fr
esh water and to drink almost 0.25 liters. The intervention of a doctor is needed.
Risks for inhalation
High
concentration of vapors in air can lead to anesthetic effects up to a loss of conscience. Long exposures could
give rise to cardiac arrhythmia and sometimes even to death.
High concentrations can create a reduction of oxygen in air, with consequent possibility of suffocation. Should it happen the
person must be taken to the open air and let him take a rest.
Administer oxygen if needed. In case the breathing has
interrupted or become irregular, it is necessary to
apply the artificial breathing. In case of cardiac arrest a heart massage must be applied. Contact a doctor immediately.
Conditions to avoid
Use in presence of
exposed flames, and of high levels of humidity.
Dangerous reactions
Possibility of violent reactions with the sodium, the potassium, the barium and with other alkaline substances,
incompatible materials and all the alloys containing more than 2% of
magnesium.
Protection wearing
-
Behavior in case of losses
or escapes
Wear protection apparel and self
-rescuer respirators. Insulate the source of the loss, if this operation can be done in safety
conditions. Small quantitative of refrigerant escaped at liquid state can be allowed to evaporate only if the room is well ve
ntilated.
In case of great losses ventilate the room immediately. Plug the loss with sand, so
il or other absorbent material; avoid that the
liquid refrigerant can enter in water
-drainages or losing pools.
Dismantlement
The best procedure is the recovery and the recycle. If this is not possible the refrigerant must be conferred to an accredite
d
system for its destruction in order to neutralize acid and toxic by
-products.
e. PRECAUTIONS AGAINST RESIDUAL RISKS
Prevention from risks due to the command system
-make sure the instructions for use have been understood before carrying out any work on the control panel.
-always keep the instruction manual close at hand when working on the control panel.
-start up the unit only after having certified that it is correctly connected to the plant.
-inform the technician promptly of any alarms which appear on the unit.
-do not reset the alarms to manual restart without having first identified the cause and removed it.
f. PREVENTION AGAINST RESIDUAL MECHANICAL RISKS
-install the unit in accordance with the provisions of the following manual.
-carry out all the maintenance operations provided for by this manual regularly.
-wear a protective helmet before entering inside the unit.
-before opening a machine panel make sure that it is firmly connected by means of a hinge.
-do not touch the air condensation batteries without having first put on protective gloves.
-do not remove the protections to the moving parts while the unit is running.
-before restarting the unit make sure that the moving part protections are in the correct position.
g. PREVENTION AGAINST RESIDUAL ELECTRICAL RISKS
-connect the unit to the mains in accordance with the provisions of this manual.
-carry out all maintenance operations regularly.
-before opening the control panel or access any electrical component installed on the unit disconnect the unit from
the mains by means of the mainswitch.
It must be taken into account especially that when soft starters instead of contactors are installed as
compressors drives, one phase of any compressor remains live when the compressor is off but the main
switch is closed. Do not access the compressor electrical box.
-check that the unit has been earthen correctly before starting it up.
-control all the electrical connections and the connection cables paying particular attention to the state of
isolation; replace the cables which are clearly worn or damaged.
-carry out periodic checks of the wiring inside the panel.
-do not use cables with an inappropriate section or flying connections not even for a limited period or in anemergency.
h. PREVENTION AGAINST RESIDUAL RISKS OF A DIFFERENT NATURE
-the residual risks due to pressure are mainly coming from a failure of the safety devices. To prevent them it is
necessary to check and replace them when required
-the unit is equipped with high pressure safety valves which may relieve high pressure and high
temperature refrigerant in close vicinity of the unit in case of an abnormal overpressure event. In order to
prevent harm to people who might find themselves close to the unit, the installer should convey the
escaped refrigerant by means of piping. The safety valves installed in the unit are equipped with a
threaded connection that makes conveying easier.
If a piping aimed at conveying refrigerant from safety valves, as described above, has not been installed by the

Page 6
installer, in order to protect from safety devices exhausting it is not allowed to remove the protections while the unit
is in operation and to approach the unit without wearing the right protections. In case of accidental contact with
refrigerant due to the safety valves exhaust it is necessary to follow the above indicated.
-carry out the plant connections to the unit by following the indications reported on the following manual and on
the panels of the unit itself.
-if a part is disassembled, make sure that it is correctly reassembled before restarting the unit.
-do not touch the discharge line of the compressor, the compressor itself or any other tube or component which
is inside the machine without putting on protective gloves.
-keep a fire extinguisher which is able to put out fires on electrical equipment near the machine.
-in the event of fire either if it originates on the unit or near it make sure the power supply to the unit is promptly cut and
that any person who might be near the unit at that moment is moved to a secure location
-on units installed inside, connect the refrigerant circuit shut off valve to a network of tubes which are able to
lead the possible spillage of refrigerating fluid outside.
-eliminate any fluid loss inside or outside the unit.
-collect the discharge liquid and clean up any possible oil leakage.
-periodically clean the compressor casing of the accumulated dirt deposits.
-do not keep inflammable liquids near the unit.
-do not dispose of the refrigerant fluid and the lubricating oil in the environment.
-welding should only be carried out on empty tubes; do not approach the tubes containing refrigerant fluid with
flames or other sources of heat.
-do not bend or strike tubes containing pressurized fluids.
i. PRECAUTIONS TO BE OBSERVED DURING MAINTENANCE OPERATIONS
Only authorised technicians may carry out maintenance operations. Before carrying out any maintenance the
following must beperformed:
-isolate the unit from the mains electricity by using the external knife switch.
-place a notice on the external knife switch which says “do not use - maintenance in progress”.
-make sure that any possible on-off commands are disabled.
-use appropriate safety equipment (helmet, isolating gloves, protective glasses, safety shoes etc.).
If measurements or controls must be carried out which require the machine to be running the following
observations must be followed:
-operate with the electrical panel open for as short a time as is possible.
-close the electrical panel as soon as the individual measurement or control has been carried out.
-for units which are located outside, do not carry out interventions in dangerous atmospheric conditions such as
rain, snow, fog etc.
The following precautions should also be taken at all times:
-never dispose of fluids contained in the refrigerant circuit into the environment.
-when replacing the electronic card always use appropriate equipment (extractor, anti-static bracelet, etc.).
-if a compressor, evaporator, coil or any other heavy part is to be replaced, make sure that the lifting equipment
matches the weight to be lifted.
-if the unit has an independent compressor compartment, do not open the ventilator compartment without
having first isolated the machine using the knife switch on the side of the panel and only after having placed a sign
which says “do not use - maintenance in progress”.
-if modifications must be carried out to the cooling, hydraulic or electrical circuit of the unit, as well as to its
command logic, contact Trane.
-if particularly complicated assembly or disassembly operations are to be carried out contact Trane.
-always use original spare parts bought directly from Trane or from official dealers of the companies reported in
the list of recommended spare parts.
-if the unit is to be moved after a year of being in the site or if it has to be dismantled contact Trane.

Page 7
l. WARNING – HIGH PRESSURE SAFETY VALVE
No high pressure safety valve is installed on the unit.
The unit fail safe is assured by cut-out of the electrical power supply to the coils of the compressors contactors. The
cut-out action is carried out by the electrical contact of the dedicated high pressure switch PA highlighted in the figure
below “Part of the refrigerant circuit drawing which includes the high pressure switch PA”.
Due to the fact that no Schrader valve is installed in the pressure port the dedicated high pressure switch is plugged
into, it is absolutely forbidden to pull out the high pressure switch PA if the unit is not completely void of refrigerant.
Failure to follow these instructions could result in death or serious injury.
Part of the refrigerant circuit drawing which includes the high pressure switch PA
m. MANUAL ALARM RESET
If there is an alarm the unit must not be manually reset before having located and eliminated the cause of the fault.
Repeated manual resets may cause the warranty to be annulled.

Page 8
3. OPERATING LIMITS
a. STORAGE
The units can be stored within the following environmental conditions:
Min ambient temperature : -10°C
Max ambient temperature : 53°C
Max relative humidity : 95% not condensable
CAUTION: The storage in a very high humidity space (condensation) can damage electronic components.
b. OPERATING LIMITS
Unit operation is permitted within the limits indicated in the diagram provided in 3.3.
CAUTION: The operation outside the limits specified may cause the activation of the protections and disrupt the operation of
the unit and, in extreme cases, damage the unit.
In case of doubt, consult the factory.
These operating limits apply to unit operating at full load.
c. OPERATING RANGE
Only
with
Low
ambient
air
temp. kit
only with
CONDENSING
CONTROL
(OPTIONAL)

Page 9
Low ambient air temperature kit down to -20°C:
Electrical heater in the control box
Low temperature resistant electrical cables
Hydrofil treated coil
Additional coil heater
IMPORTANT
The low ambient air temperature kit is mandatory for temperatures from -20 °C to -10 °C .
4. INSTALLATION
a. MOVING AND POSITIONING THE UNIT
The units have been designed to be lifted from above by means of eyebolts and holes in the base members. Use retractor
bars to keep the lifting wires or chains away from the unit.
Lifting procedures provided with the unit have to be respected.
WARNING
Do not use forklift trucks to lift the unit from below. If equipment for lifting from above is not available, using rollers may move
the unit. The surface on which the unit is placed must be flat and strong enough to withstand the weight of the unit while
running. To reduce the transmission of vibrations to the supporting structures, fit shock absorbers in every fastening point.
Rubber shock absorbers are recommended for units installed on the ground, spring shock absorbers for units installed on
roofs. Open spaces around the unit must be provided to allow for the passage of necessary airflow and to allow maintenance
to be carried out.
IMPORTANT: Make sure that during transport the unit ALWAYS remains in the correct position!
Horizontal positioning of the unit can lead to irreversible damage to the compressors. Damage arising from incorrect
transport will not be under warranty by the manufacturer. Immediately report an incorrect receipt of goods.
An arrow positioned upward indicates the vertical position of the unit.
b. MINIMUM SPACE REQUIREMENTS
0
5
10
15
20
25
30
35
40
45
50
-12 -7 -2 3 8 13 18
Outdoor air temperature [
°C]
Leaving water temperature [°C]
CHILLER MODE
Glycol
only with
CONDENSING
CONTROL
(OPTIONAL)

Page 10
Minimum space requirements reported in the dimensional drawing shall be respected to avoid:
• Noise
• Incorrect heat exchange and ventilation
• Difficult maintenance or inaccessibility to components
It is fundamental to respect minimum distances on all units to ensure optimum ventilation for the condenser coils. Limited
installation space could reduce the normal air flow, thus significantly reducing the unit performance and considerably
increasing consumption of electrical energy.
CAUTION:in case two units have to be installed side by side, the distance of respect must be doubled.
c. PRECAUTIONS FOR DOMINANT WINDS
Avoid obstacles on suction and discharge sides of the units. Respect the safety distances as shown on the units
dimensional drawings.
In case of presence of dominant winds in the installation area it is strictly necessary to avoid (for units with horizontal flow
fans) that such winds blow in front of the unit (fans discharge side). In case of unit with vertical flow fans it is strictly
necessary to avoid installations where the dominant winds could cause rejected hot air to come back to the condensing
coils.
d. PRECAUTIONS AGAINST DIRECT SUNSHINE
Direct solar radiation can raise the temperature of condensation until it causes the unit shutdown or failure start-up
of the same by action of the high pressure switch.
e. PRECAUTIONS AGAINST THE PRESENCE OF FIREPLACES AND EXHAUST HOT
AIR
Avoid installation of the machines downwind of chimneys, smokestacks and different effluent discharges.
f. PRECAUTIONS AGAINST THE PRESENCE OF FOLIAGE AND FOREIGN BODIES
Avoid installing the unit in the immediate vicinity of plants that can prevent proper intake and discharge air.
g. CONTROL OF COMPRESSOR FASTENING
The compressors are fitted on shock absorbers. For fixing through spring anti-vibration mounts, it is necessary to remove
blockages put to fasten the compressors, as indicated on the label on compressors body.
h. ACOUSTIC PROTECTION
When the sound level must be checked, pay attention to the isolation from the base of the unit properly applying the
anti-vibration mounts (provided optionally). Also, install flexible joints on water connections.
5. ELECTRICAL POWER SUPPLY
The mains power supply characteristics have to match the unit’s absorption. The mains power supply tension must
correspond to the nominal value ± 10%, with a maximum difference between the phases of 2%.
All power supply wiring must be sized and selected accordingly by the project engineer in accordance with standard IEC
60364. All wiring must comply with local code.
a. POWER CONNECTIONS
Protect the unit electric box power supply circuit with protection devices (not included in the supplied equipment). Connect
the line terminals with a three-core cable of a section which is appropriate to the machine absorption. The switch and the
fuses like all the power connections must comply with the regulations in force.
b. IMBALANCE BETWEEN THE SUPPLY TENSION PHASES
Do not run the electrical motors when the voltage unbalance between the phases is more than 2%. Use the following
formula to check:
% Imbalance = [(Vx – Vave) x 100/Vave]

Page 11
Vave = (V1 + V2 + V3)/3
Vx = phase with greatest difference from Vave (without
regard to the sign)
IMPORTANT: If the mains voltage has an imbalance of above 2%, contact the company, which distributes the
electrical energy. If the unit functions with a unit voltage imbalance between the phases of above 2% the
warranty is invalid.
c. UNIT VOLTAGE PHASING
It is important that proper rotation of the compressors be established before the unit is started. Proper motor
rotation requires confirmation of the electrical phase sequence of the power supply. The motor is internally
connected for clockwise rotation with the incoming power supply phases A-B-C.

Page 12
6. WATER CONNECTIONS
a. EVAPORATOR
The connection tubes have to be supported adequately in order that their weight does not damage the plant.
It is necessary that the water flow rate to the unit is compatible with the evaporator one. It is also necessary that the water flow
rate is kept uniform while the unit is running: it is suggested to use always a pump system dedicated to the unit and independent
from the remaining part of the plant.
Before stalling units with temperature around 0°C please evacuate the exchanger with compressed air in order to avoid
breakings due to ice.
If the unit is installed in order to replace another, the entire hydraulic system must be emptied and cleaned before the
new unit is installed. Regular tests and proper chemical treatment of water are recommended before starting up the
new unit.
In the event that glycol is added to the hydraulic system as anti-freeze protection, pay attention to the fact that intake
pressure will be lower, the unit’s performance will be lower and water pressure drops will be greater. All unit-protection
methods, such as anti-freeze, and low-pressure protection will need to be reset. Before insulating water piping, check
that there are no leaks.
CAUTION: Install a mechanical water filter at the water outlet of each heat exchanger. Failure to install the filter allows
access of solid particles and / or welding slag inside the heat exchanger. We recommend the installation of a filter having a
filtering net with holes not exceeding 0.5 mm in diameter.
Trane cannot be held responsible for any damage to heat exchangers due to the lack of good quality water filters.
Maximum operating pressure: 6 bar

Page 13
i.Calculation of total recommended water content and flow rates
For optimum operation, the unit needs a water content according to the following values:
FLEX HP HT
Model
Cooling mode
Heating mode
V
K
Q min
Q max
V
K
Q min
Q max
[m
3
]
[m
3
/h]
[m
3
/h]
[m
3
]
[m
3
/h]
[m
3
/h]
050
0,4
191,0
5,4
14,4
1,4
147,3
6,3
16,9
060
0,5
153,5
6,3
16,7
1,6
130,1
7,1
19,1
070
0,6
116,1
7,3
19,4
1,9
99,2
8,2
21,9
075
0,6
100,1
8,0
21,2
2,1
85,2
9,1
24,1
085
0,7
41,1
9,1
24,2
2,4
36,1
10,6
28,3
095
0,8
35,2
10,1
27,0
2,7
30,8
11,9
31,6
110
0,9
26,1
11,8
31,5
3,2
23,1
13,8
36,8
130
1,1
18,9
14,0
37,3
3,7
16,8
16,3
43,4
140
1,2
18,3
14,7
39,3
3,9
16,3
17,2
45,9
145
1,2
16,9
15,4
41,2
4,1
15,0
18,1
48,2
KEY:
V: recommended water content of the plant with dT 5°C on the heat exchanger
Q min: minimum water flow to the heat exchanger
Q max: maximum water flow to the heat exchanger
dpw = K·Q² / 1000
Q= 0,86 P/ΔT
P: Heating or cooling capacity [kW]
Δt: ΔT at the heat exchanger (min = 3, max = 8) [°C]
Δt: ΔT at the desuperheater = 4°C
dpw: Pressure drop [kPa]

Page 14
FLEX HP HT S (SUPER LOW NOISE)
Model
Cooling mode
Heating mode
V
K
Q min
Q max
V
K
Q min
Q max
[m
3
]
[m
3
/h]
[m
3
/h]
[m
3
]
[m
3
/h]
[m
3
/h]
050
0,4
191,0
5,3
14,1
1,4
147,3
6,1
16,4
060
0,5
153,5
6,1
16,3
1,6
130,1
7,0
18,8
070
0,6
116,1
7,1
18,9
1,8
99,2
8,0
21,2
075
0,6
100,1
7,7
20,7
2,0
85,2
8,8
23,4
085
0,7
41,1
8,9
23,6
2,4
36,1
10,4
27,8
095
0,8
35,2
9,9
26,3
2,7
30,8
11,7
31,2
110
0,9
26,1
11,5
30,7
3,1
23,1
13,5
36,0
130
1,1
18,9
13,7
36,5
3,6
16,8
15,8
42,0
140
1,2
18,3
14,4
38,4
3,8
16,3
16,7
44,4
145
1,2
16,9
15,1
40,3
4,0
15,0
17,5
46,6
KEY:
V: recommended water content of the plant with dT 5°C on the heat exchanger
Q min: minimum water flow to the heat exchanger
Q max: maximum water flow to the heat exchanger
dpw = K·Q² / 1000
Q= 0,86 P/ΔT
P: Heating or cooling capacity [kW]
Δt: ΔT at the heat exchanger (min = 3, max = 8) [°C]
Δt: ΔT at the desuperheater = 4°C
dpw: Pressure drop [kPa]

Page 15
IMPORTANT: In case the water pump is driven by an inverter (either an on-board pump or an external pump) make
sure that in every working condition the variation of the water flow rate must be as low as possible.
Flow rate variation must be less than 10% of the nominal flow rate per minute
WATER TREATMENT
Before start-up, clean the hydraulic circuit. Dirt, scales, corrosion residue and other extraneous material can
accumulate inside the heat exchanger and reduce its heat exchanging capacity. Pressure drops can increase,
reducing water flow. Proper water treatment therefore reduces the risk of corrosion, erosion, scaling, etc. The
most appropriate water treatment must be determined locally, according to the type of system and to the local
characteristics of the process water.
Trane is not responsible for damage to or malfunctioning of equipment caused by failure to treat water or by
improperly treated water.
Acceptable water quality limits
PH (25°C) 6,8÷8,0 Total Hardness
(mg CaCO
3
/ l) < 200
Electrical conductivity
S/cm (25°C)
< 800 Iron (mg Fe / l) < 1.0
Chloride ion
(mg Cl - / l)
< 200 Sulfur ion
(mg S
2-
/ l)
None
Sulphate ion
(mg SO
24-
/ l)
< 200 Ammonium ion
(mg NH
4+
/ l) < 1.0
Alkalinity
(mg CaCO
3
/ l) < 100 Silica
(mg SiO
2
/ l)
< 50
b. PRECAUTION AGAINST FROST RISK OF THE HYDRAULIC PIPES
It is necessary to insulate pipes in the plant to avoid extreme heat loss and to protect them from weather
conditions. The problem of water pipes freezing could appear in two different situations:
1. Stand by, with mode on, but electrically connected: in this case, the unit has frost resistances, which protect the
water locally contained in the exchangers and in the pipes from ice formation. These resistances do not ensure
the protection against the frost in the outdoor connection pipes, to be prevented by frost protection systems.
Trane suggest to insert frost thermostatic resistances on every outdoor pipes. In the following table there are the
indicative electric powers per pipe linear meter
Heating cable required power
dn inch
W / m
8 1/4" 5
10 3/8" 5
15 1/2" 5
20 3/4" 10
25 1" 13
40 1" 1/2 30
50 2" 50
65 2" 1/2 80
80 3" 120
100 4" 200
125 5" 300
150 6" 450
2. Electrically unconnected unit: in this case the frost resistances of the unit could not ensure the protection. It is
necessary to add the correct glycol quantity indicated in the chapter: “ethylene glycol correction table” (§3.3).
Please consult Trane for % of glycol required.

Page 16
i. Precaution for very low outdoor temperatures
In case of installation conditions with a very low temperature:
If there is a storage on board the unit, insert electric resistances to be calculated by:
PrWatt = V x (10 – tmin) / 860
where: PrWatt is the resistance power (Watt) and tmin is the lower temperature (°C)
If there is no storage, maintain the water temperature higher than 10°C by inserting thermostatic resistance with
power calculated as in case 1.
c. ANTIFREEZE PROTECTION ON THE HEAT EXCHANGER
Two or more protection methods should be foreseen when designing the system as a whole:
1. Continuous water flow circulation inside piping and exchanger when ambient air temperature is holding below 5 °C.
This implies what follows:
- if the water flow inside piping and exchanger of the unit is due to an external pump installed by the customer, the
on/off command of this pump must always be the one provided by the unit controller through the relevant free
potential contact in the electrical cabinet.
- as long as the ambient air temperature is holding below 5 °C the unit must always be electrically supplied.
Moreover the customer pump, if present, must always be electrically supplied alike and functioning properly.
2. Addition of an appropriate amount of glycol inside the water circuit.
3. Additional heat insulation and sufficient heating of exposed piping.
IMPORTANT: Trane can provide various optional kits (they are not included in the Low ambient kit down to -
10°C) for the protection of all the components of the hydraulic circuit inside the unit (pumps, pipes and tank).
For selection and price; contact your local Trane office.
4. Emptying and cleaning of the heat exchanger during the winter season.
It is the responsibility of the installer and/or of local maintenance personnel to ensure two or more of the described antifreeze
methods. Continuously verify, through routine checks, that appropriate anti-freeze protection is maintained.
Failure to follow the instructions above could result in damage to some of the unit’s components. Damage from freezing is
not covered by the warranty.
CAUTION: The unit water pipes are not protected against the risk of water freeze-up when the unit is not electrically
powered and when the power and control of the external water pumps is not managed by the unit controller. The owner or
local maintenance personnel must provide appropriate solutions to prevent freezing.

Page 17
7. HYDRAULIC VERSIONS
Units are available in four hydraulic versions characterized by complete kits of all major hydraulic components for an easier
installation, with reduced time, cost and space.
1. single pump
2. single pump and tank
3. double pump
4. double pump and tank
Hydronic accessories on request
•“Y” water strainer (sold separately), consists of body and stainless steel mesh*, with replaceable filter
through the inspection cap.
•Automatic water filling (sold separately).
•Water antifreeze protection kits
•Water gauges kit
(*) Water strainer with meshes not over 0.5mm
IMPORTANT: water strainer and flow switch must be installed on water circuit (user side) to keep the warranty. No
water flow control device is installed on the unit so, the flow switch is always provided as a loose accessory
(optional) and must be installed by the customer.
i.Hydraulic diagrams
HYDRAULIC SCHEME WITH HYDRAULIC VERSION AND WATER TANK FROM SIZE 050 TO 145
Hydronic kit with 1 pump – 1/2/3 Versions
Hydronic kit with 2 pumps – 4/5/6 Versions
M
Gauges
S
Water discharge
P
Pump
SV
Safety valve
SF
Relief valve
ET
Expansion valve
PD
Water differential pressure switch
PRS
Empty plant security pressure switch
R
Shut off valve
EWR
Evaporator
M
Gauges
S
Water discharge
P
Pump
SV
Safety valve
SF
Relief valve
ET
Expansion valve
PD
Water differential pressure switch
PRS
Empty plant security pressure switch
R
Shut off valve
EWR
Evaporator
PR
Additional pump water pressure switch
VR
Check valve

Page 18
Hydrauli kit with 1 pump and water tank – A/B/C Versions
Hydraulic kit with 2 pumps and water tank – D/E/F Versions
M
Gauges
S
Water discharge
P
Pump
SV
Safety valve
SF
Relief valve
ET
Expansion valve
PD
Water differential pressure switch
PRS
Empty plant security pressure switch
R
Shut off valve
EWR
Evaporator
PR
Additional pump water pressure switch
VR
Check valve
WT
Water tank
GR
Filling group