Toshiba HWT-801H8W-E User manual

AIR TO WATER HEAT PUMP
Installation Manual
Outdoor Unit
Model name:
4kW model (HWT-40)
HWT-401HW-E
6kW model (HWT-60)
HWT-601HW-E
8kW model (HWT-80)
HWT-801HW-E
HWT-801HRW-E
HWT-801H8W-E
HWT-801H8RW-E
11kW model (HWT-110)
HWT-1101HW-E
HWT-1101HRW-E
HWT-1101H8W-E
HWT-1101H8RW-E
14kW model (HWT-140)
HWT-1401HW-E
HWT-1401HRW-E
HWT-1401H8W-E
HWT-1401H8RW-E
English
R32

Outdoor Unit Installation Manual
– 1 –
Original instructions
Please read this Installation Manual carefully before installing the Air to Water Heat Pump.
• This Manual describes the installation method of the Outdoor Unit.
• For installation of the Hydro Unit, follow the Installation Manual attached to the Hydro Unit.
REFRIGERANT
This Air to Water Heat Pump uses an HFC refrigerant (R32) in order to prevent destruction of the ozone layer.
▼HWT-801HW-E,HWT-1101HW-E,HWT-1401HW-E,HWT-801HRW-E,HWT-1101HRW-E,
HWT-1401HRW-E
This equipment complies with IEC 61000-3-12 provided that the short-circuit power Ssc is greater than or
equal to Ssc (*1) at the interface point between the user’s supply and the public system. It is the responsibility
of the installer or user of the equipment to ensure, by consultation with the distribution network operator if
necessary, that the equipment is connected only to a supply with a short-circuit power Ssc greater than or
equal to Ssc (*1).
Furthermore, when similar equipment or other equipment which may cause harmonic current emissions are
to be connected to the same interface point with this equipment, to reduce the risk of possible problems which
may be caused from addition of those harmonic current emissions, it is recommended to make sure that the
short-circuit power Ssc at the interface point is greater than the sum of the minimum Ssc required by all the
equipment which will be connected to the interface point.
Ssc (*1)
Model name Ssc (*1) (kVA)
HWT-801HW-E
HWT-1101HW-E
HWT-801HRW-E
HWT-1101HRW-E
820
HWT-1401HW-E
HWT-1401HRW-E 1320
<HWT-1401HW-E,HWT-1401HRW-E>
This unit complies with EN 61000-3-11.
However, the impedance of the power supply system to be connected to the unit at the incoming power
point must be less than the Zmax given below.
In order to meet this condition, consult with the supply authority as required.
HWT-1401HW-E,HWT-1401HRW-EZmax=0.797(Ω)
In addition, it is recommended that voltage drops occurring during the unit’s operation in the area at the
power input shall be around 3.3% of the nominal power-supply voltage or less.
1-EN 2-EN
Contents
1 Precautions for safety.................................................................................................. 3
2 Accessory parts........................................................................................................... 6
3 Installation of R32 Air to Water Heat Pump................................................................ 6
4 Installation conditions................................................................................................. 7
5 Refrigerant piping...................................................................................................... 10
6 Air purging.................................................................................................................. 12
7 Electricalwork............................................................................................................ 15
8 Earthing....................................................................................................................... 17
9 Finishing..................................................................................................................... 17
10 Test run....................................................................................................................... 17
11 Annual maintenance.................................................................................................. 17
12 Air to Water Heat Pump operating conditions......................................................... 17
13 Functions to be implemented locally....................................................................... 17
14 Troubleshooting......................................................................................................... 19
15Appendix..................................................................................................................... 19

Outdoor Unit Installation Manual
– 2 –
■Generic denomination: Air to Water Heat Pump
■Definition of qualified installer or qualified service person
The Air to Water Heat Pump must be installed, maintained, repaired and removed by a qualified installer or
qualified service person. When any of these jobs is to be done, ask a qualified installer or qualified service
person to do them for you.
A qualified installer or qualified service person is an agent who has the qualifications and knowledge described in
the table below.
Agent Qualificationsandknowledgewhichtheagentmusthave
Qualied installer
• The qualified installer is a person who installs, maintains, relocates and removes the Air to Water Heat
Pumps made by Toshiba Carrier Air-Conditioning Europe Sp. z o.o. He or she has been trained to install,
maintain, relocate and remove the Air to Water Heat Pump made by Toshiba Carrier Air-Conditioning
Europe Sp. z o.o. or, alternatively, he or she has been instructed in such operations by an individual or
individuals who have been trained and is thus thoroughly acquainted with the knowledge related to these
operations.
• The qualified installer who is allowed to do the electrical work involved in installation, relocation and
removal has the qualifications pertaining to this electrical work as stipulated by the local laws and regu-
lations, and he or she is a person who has been trained in matters relating to electrical work on the Air to
Water Heat Pump made by Toshiba Carrier Air-Conditioning Europe Sp. z o.o. or, alternatively, he or she
has been instructed in such matters by an individual or individuals who have been trained and is thus
thoroughly acquainted with the knowledge related to this work.
• The qualified installer who is allowed to do the refrigerant handling and piping work involved in instal-
lation, relocation and removal has the qualifications pertaining to this refrigerant handling and piping
work as stipulated by the local laws and regulations, and he or she is a person who has been trained in
matters relating to refrigerant handling and piping work on the Air to Water Heat Pump made by Toshiba
Carrier Air-Conditioning Europe Sp. z o.o. or, alternatively, he or she has been instructed in such matters
by an individual or individuals who have been trained and is thus thoroughly acquainted with the knowl-
edge related to this work.
• The qualified installer who is allowed to work at heights has been trained in matters relating to working
at heights with the Air to Water Heat Pump made by Toshiba Carrier Air-Conditioning Europe Sp. z o.o.
or, alternatively, he or she has been instructed in such matters by an individual or individuals who have
been trained and is thus thoroughly acquainted with the knowledge related to this work.
Qualied service
person
• The qualified service person is a person who installs, repairs, maintains, relocates and removes the Air
to Water Heat Pump made by Toshiba Carrier Air-Conditioning Europe Sp. z o.o. He or she has been
trained to install, repair, maintain, relocate and remove the Air to Water Heat Pump made by Toshiba
Carrier Air-Conditioning Europe Sp. z o.o. or, alternatively, he or she has been instructed in such oper-
ations by an individual or individuals who have been trained and is thus thoroughly acquainted with the
knowledge related to these operations.
• The qualified service person who is allowed to do the electrical work involved in installation, repair, relo-
cation and removal has the qualifications pertaining to this electrical work as stipulated by the local laws
and regulations, and he or she is a person who has been trained in matters relating to electrical work on
the Air to Water Heat Pump made by Toshiba Carrier Air-Conditioning Europe Sp. z o.o. or, alternatively,
he or she has been instructed in such matters by an individual or individuals who have been trained and
is thus thoroughly acquainted with the knowledge related to this work.
• The qualified service person who is allowed to do the refrigerant handling and piping work involved in
installation, repair, relocation and removal has the qualifications pertaining to this refrigerant handling
and piping work as stipulated by the local laws and regulations, and he or she is a person who has been
trained in matters relating to refrigerant handling and piping work on the Air to Water Heat Pump made
by Toshiba Carrier Air-Conditioning Europe Sp. z o.o. or, alternatively, he or she has been instructed in
such matters by an individual or individuals who have been trained and is thus thoroughly acquainted
with the knowledge related to this work.
• The qualified service person who is allowed to work at heights has been trained in matters relating to
working at heights with the Air to Water Heat Pump made by Toshiba Carrier Air-Conditioning Europe Sp.
z o.o. or, alternatively, he or she has been instructed in such matters by an individual or individuals who
have been trained and is thus thoroughly acquainted with the knowledge related to this work.
■Definition of protective gear
When the Air to Water Heat Pump is to be transported, installed, maintained, repaired or removed, wear
protective gloves and “safety” work clothing.
In addition to such normal protective gear, wear the protective gear described below when undertaking the
special work detailed in the table below.
Failure to wear the proper protective gear is dangerous because you will be more susceptible to injury, burns,
electric shocks and other injuries
Work undertaken Protectivegearworn
All types of work Protective gloves
“Safety” working clothing
Electrical-related work
Gloves to provide protection for electricians and from heat
Insulating shoes
Clothing to provide protection from electric shock
Work done at heights (50 cm
or more) Helmets for use in industry
Transportation of heavy objects Shoes with additional protective toe cap
Repair of Outdoor Unit Gloves to provide protection for electricians and from heat
3-EN 4-EN

Outdoor Unit Installation Manual
– 3 –
Warning Indications on the Air to Water Heat Pump Unit
WARNING
(Risk of re)
This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of
Outdoor Unit.
In case that refrigerant type is R32, this unit uses a ammable refrigerant.
If refrigerant leaks and comes in contact with re or heating part, it will create
harmful gas and there is risk of re.
Read the OWNER’S MANUAL carefully before operation.
Service personnel are required to carefully read the OWNER’S MANUAL and INSTALLATION MANUAL
before operation.
Further information is available in the OWNER’S MANUAL, INSTALLATION MANUAL, and the like.
Warning indication Description
WARNING
ELECTRICALSHOCKHAZARD
Disconnect all remote electric power supplies before servicing.
WARNING
Movingparts.
Do not operate unit with grille removed.
Stop the unit before the servicing.
CAUTION
High temperature parts.
You might get burned when removing this panel.
CAUTION
Do not touch the aluminium fins of the unit.
Doing so may result in injury.
CAUTION
BURSTHAZARD
Open the service valves before the operation, otherwise there might be
the burst.
WARNING
WARNING
CAUTION
CAUTION
CAUTION
ELECTRICAL SHOCK HAZARD
Disconnect all remote
electric power supplies
before servicing.
Moving parts.
Do not operate unit with grille
removed.
Stop the unit before the servicing.
High temperature parts.
You might get burned
when removing this panel.
Do not touch the aluminum
ns of the unit.
Doing so may result in injury.
BURSTHAZARD
Open the service valves before
the operation, otherwise there
might be the burst.
1Precautions for safety
• Ensure that all Local, National and International regulations are
satisfied.
• Read this “Precautions for safety” carefully before Installation.
• The precautions described below include the important items
regarding safety.
Observe them without fail.
• After the installation work, perform a test run to check for any
problem. Follow the Owner’s Manual to explain how to use and
maintain the unit to the customer.
• Turn off the main power supply switch (or breaker) before the unit
maintenance.
• Ask the customer to keep the Installation Manual along with the
Owner’s Manual.
WARNING
• Ask an authorized dealer or qualified installation professional
toinstall/maintaintheAirtoWaterHeatPump.
Inappropriate installation may result in water leakage, electric
shock or fire.
• Besuretoconnectearthwire.(groundingwork)
Incomplete grounding cause an electric shock.
Do not connect ground wires to gas pipes, water pipes, lightning
rods or ground wires for telephone wires.
•Turnoffthemainpowersupplyswitchorbreakerbefore
attemptinganyelectricalwork.
Make sure all power switches are off. Failure to do so may cause
electric shock.
Use an exclusive power circuit for the Air to Water Heat Pump. Use
the rated voltage.
•Connectthesysteminterconnectionwirecorrectly.
If the system interconnection wire is connected in a wrong way,
electric parts may be damaged.
• When moving the Air to Water Heat Pump for the installation into
anotherplace,beverycarefulnottoenteranygaseousmatter
otherthanthespecifiedrefrigerantintotherefrigerationcycle.
If air or any other gas is mixed in the refrigerant, the gas pressure
in the refrigeration cycle becomes abnormally high and it may
resultingly causes pipe burst and injuries on persons.
5-EN 6-EN

Outdoor Unit Installation Manual
– 4 –
• Do not modify this unit by removing any of the safety guards
orbyby-passinganyofthesafetyinterlockswitches.
•Afterunpackingtheunit,examineitcarefullyifthereare
possibledamage.
• Do not install in a place that might increase the vibration of the
unit.
•Toavoidpersonalinjury(withsharpedges),becarefulwhen
handlingparts.
•PerforminstallationworkproperlyaccordingtotheInstallation
Manual.
Inappropriate installation may result in water leakage, electric shock
or fire.
• When the Air to Water Heat Pump Hydro Unit is installed in a
smallroom,provideappropriatemeasurestoensurethatthe
concentration of refrigerant leakage occur in the room does
notexceedthecriticallevel.
•Tightentheflarenutwithatorquewrenchinthespecified
manner.Excessivetighteningoftheflarenutmaycausea
crackintheflarenutafteralongperiod,whichmayresultin
refrigerantleakage.
•Wearheavyglovesduringtheinstallationworktoavoidinjury.
•InstalltheAirtoWaterHeatPumpsecurelyinalocationwhere
thebasecansustaintheweightadequately.
•Performthespecifiedinstallationworktoguardagainstan
earthquake.
If the Air to Water Heat Pump is not installed appropriately,
accidents may occur due to the falling unit.
•Ifrefrigerantgashasleakedduringtheinstallationwork,
ventilatetheroomimmediately.
If the leaked refrigerant gas comes in contact with fire, noxious gas
may generate.
•Aftertheinstallationwork,confirmthatrefrigerantgasdoes
notleak.
If refrigerant gas leaks into the room and flows near a fire source,
such as a cooking range, noxious gas might generate.
•Electricalworkmustbeperformedbyaqualifiedelectricianin
accordancewiththeInstallationManual.
MakesuretheAirtoWaterHeatPumpusesadedicatedpower
supply.
An insufficient power supply capacity or inappropriate installation
may cause fire.
•Usethespecifiedwiresforwiringconnecttheterminals
securelyfix.
Topreventexternalforcesappliedtotheterminalsfrom
affectingtheterminals.
•WhentheAirtoWaterHeatPumpcannotcoolorheatwaterwell,
contactthedealerfromwhomyoupurchasedtheAirtoWater
HeatPumpasrefrigerantleakageisconsideredasthecause.
Inthecaseofrepairthatrequiresrefillofrefrigerant,ask
servicepersonnelaboutdetailsoftherepair.
The refrigerant used in the Air to Water Heat Pump is harmless.
Generally, the refrigerant does not leak. However, if the refrigerant
leaks in a room and a heater or stove burner in the room catches
fire, it may generate toxic gas.
When you ask service personnel for repairing refrigerant leakage,
confirm that the leakage portion has been completely repaired.
•Conformtotheregulationsofthelocalelectriccompanywhen
wiringthepowersupply.
Inappropriate grounding may cause electric shock.
• Do not install the Air to Water Heat Pump in a location subject
toariskofexposuretoacombustiblegas.
If a combustible gas leaks, and stays around the unit, a fire may occur.
•Installtherefrigerantpipesecurelyduringtheinstallationwork
beforeoperatingtheAirtoWaterHeatPump.
If the compressor is operated with the valve open and without the
refrigerant pipe, the compressor sucks air and the refrigeration cycle
is overpressurized, which may cause a burst or injury.
•Fortherefrigerantrecoverywork(collectionofrefrigerant
fromthepipetothecompressor),stopthecompressorbefore
disconnectingtherefrigerantpipe.
If the refrigerant pipe is disconnected while the compressor is working
with the valve open, the compressor sucks air and the refrigeration
cycle is overpressurized, which may cause a burst or injury.
• Do not use means to accelerate the defrosting process or to
clean,otherthanthoserecommendedbythemanufacturer.
•Theapplianceshallbestoredinaroomwithoutcontinuously
operatingignitionsources(forexample:openflames,an
operatinggasapplianceoranoperatingelectricheater).
•Donotpierceorburn.
•Beawarethatrefrigerantsmaynotcontainanodour.
•Theinstallationofpipe-workshallbekepttoaminimum.
7-EN 8-EN

Outdoor Unit Installation Manual
– 5 –
•Thepipe-workshallbeprotectedfromphysicaldamage.
•Compliancewithnationalgasregulationsshallbeobserved.
CAUTION
This Air to Water Heat Pump adopts the HFC refrigerant (R32) which
does not destroy the ozone layer.
• R32 refrigerant has a high working pressure and is apt to be
affected by impurities such as water, oxidizing membrane, and
oils. Therefore, during installation work, be careful that water, dust,
previous refrigerant, refrigerating machine oil, or other substances
do not enter the R32 refrigeration cycle.
• Special tools for R32 or R410A refrigerant are required for
installation.
• For connecting pipes, use new and clean piping materials, and
make sure that water and/or dust does not enter.
Cautions for Outdoor Unit installation space
• In the event that the Outdoor Unit is installed in a small space
and refrigerant leaks, accumulation of highly concentrated
refrigerant may cause a fire hazard. Therefore, be sure to follow
the installation space instructions in the Installation Manual, and
provide open space on at least one of the four Outdoor Unit sides.
• In particular, when both the discharge and intake sides face walls
and obstacles are also placed on both sides of the Outdoor Unit, take
steps to provide space wide enough for a person to pass (600 mm or
more) on one side to prevent leaked refrigerant from accumulating.
Todisconnecttheproductfrommainpowersupply
• This product must be connected to the main power supply by
means of a switch with a contact separation of at least 3 mm
DonotwashAirtoWaterHeatPumpwithpressurewashers
• Electric leaks may cause electric shocks or fires.
Precautionsforrecoveryofrefrigerantwhenservicingor
relocating unita
• When removing refrigerant from a system, either for servicing
or decommissioning, it is recommended good practice that all
refrigerants are removed safely.
• When transferring refrigerant into cylinders, ensure that only
appropriate refrigerant recovery cylinders are employed. Ensure that
the correct number of cylinders for holding the total system charge is
available. All cylinders to be used are designated for the recovered
refrigerant and labelled for that refrigerant (i.e. special cylinders
for the recovery of refrigerant). Cylinders shall be complete with
pressure- relief valve and associated shut-off valves in good working
order. Empty recovery cylinders are evacuated and, if possible,
cooled before recovery occurs.
• The recovery equipment shall be in good working order with a set of
instructions concerning the equipment that is at hand and shall be
suitable for the recovery of all appropriate refrigerants including, when
applicable, flammable refrigerants. In addition, a set of calibrated
weighing scales shall be available and in good working order. Hoses
shall be complete with leak-free disconnect couplings and in good
condition. Before using the recovery machine, check that it is in
satisfactory working order, has been properly maintained and that
any associated electrical components are sealed to prevent ignition in
the event of a refrigerant release. Consult manufacturer if in doubt.
• The recovered refrigerant shall be returned to the refrigerant supplier
in the correct recovery cylinder, and the relevant waste transfer note
arranged. Do not mix refrigerants in recovery units and especially not
in cylinders.
• If compressors or compressor oils are to be removed, ensure that
they have been evacuated to an acceptable level to make certain
that flammable refrigerant does not remain within the lubricant.
The evacuation process shall be carried out prior to returning the
compressor to the suppliers. Only electric heating to the compressor
body shall be employed to accelerate this process. When oil is
drained from a system, it shall be carried out safely.
Building or wall
Outdoor Unit
Obstacle
Obstacle
600 mm or more
Building or wall
9-EN 10-EN

Outdoor Unit Installation Manual
– 6 –
2Accessory parts
Part name
Qty
Shape Usage
HWT-
40,60
HWT-
80,110,140
Outdoor Unit installation manual 1 1 Hand this directly to the customer.
Drain nipple * 1 1
Waterproof rubber cap A * - 4
Waterproof rubber cap A
Waterproof rubber cap B * 2 1
Waterproof rubber cap B
Protective bush - 1 For protecting wires (pipe cover)
Guard material for passage part - 1 For protecting passage part (pipe
cover)
Energy label 1 1
Product che 1 1
WEEE Manual
WEEE : Waste electrical and
electronic equipment
1 1
F-Gas label 1 1
Protection sheet 1 1
Cable tie - 4
* (HWT-80*H(8)RW-E, HWT-110*H(8)RW-E, HWT- 140*H(8)RW-E) are not eligible.
3Installation of R32 Air to Water Heat Pump
CAUTION
R32 refrigerant Air to Water Heat Pump installation
• ThisAirtoWaterHeatPumpadoptstheHFCrefrigerant(R32)whichdoesnotdestroyozonelayer.
Therefore, during installation work, make sure that water, dust, former refrigerant, or refrigerant oil does not enter
the R32 refrigerant Air to Water Heat Pump cycle. To prevent mixing of refrigerant or refrigerant oil, the sizes of
connecting sections of charge port on the main unit and installation tools are different from those of the conven-
tional refrigerant units.
Accordingly, special tools are required for the R32 or R410A refrigerant units. For connecting pipes, use new and clean
piping materials with high pressure fittings made for the R32 or R410A only, so that water and/or dust does not enter.
• Whenusingexistingpiping,referto“15APPENDIX-[1]Existingpiping”.
■Required Tools/Equipment and Precautions for Use
Prepare the tools and equipment listed in the following table before starting the installation work.
Newly prepared tools and equipment must be used exclusively.
Legend
: Conventional tools (R32 or R410A)
: Prepared newly (Use for R32 only)
Tools / equipment Use Howtousetools/equipment
Gauge manifold Vacuuming / charging
refrigerant and operation check
Conventional tools (R32 or R410A)
Charging hose Conventional tools (R32 or R410A)
Charging cylinder Can not be used Unusable (Use the electronic refrigerant charging
scale)
Gas leak detector Charging refrigerant Conventional tools (R32 or R410A)
Vacuum pump Vacuum drying Conventional tools (R32 or R410A)
Usable if the backow prevention adapter is installed.
Vacuum pump with backow
prevention function Vacuum drying Conventional tools (R32 or R410A)
Flare tool Flare machining of pipes Conventional tools (R32 or R410A)
Bender Bending pipes Conventional tools (R32 or R410A)
Refrigerant recovery equipment Refrigerant recovery Conventional tools (R32 or R410A)
Torque wrench Tightening are nuts Conventional tools (R32 or R410A)
Pipe cutter Cutting pipes Conventional tools (R32 or R410A)
Refrigerant cylinder Charging refrigerant Prepared newly (Use for R32 only)
Welding machine and nitrogen
cylinder Welding pipes Conventional tools (R32 or R410A)
Electronic refrigerant charging
scale Charging refrigerant Conventional tools (R32 or R410A)
11-EN 12-EN

Outdoor Unit Installation Manual
– 7–
■Refrigerant Piping
R32 refrigerant
CAUTION
• Incomplete flaring may cause refrigerant gas leakage.
• Do not re-use flares. Use new flares to prevent
refrigerant gas leakage.
• Use flare nuts that are included with the unit. Using
different flare nuts may cause refrigerant gas leakage.
Usethefollowingitemfortherefrigerantpiping.
Material:Seamlessphosphorousdeoxidized
copperpipe.
Ø6.35,Ø9.52,Ø12.7Wallthickness0.8mmormore
Ø15.88Wallthickness1.0mmormore
REQUIREMENT
When the refrigerant pipe is long, provide support
brackets at intervals of 2.5 to 3 m to clamp the refrigerant
pipe. Otherwise, abnormal sound may be generated.
4Installation
conditions
■Before installation
Be sure to prepare to the following items before
installation.
Length of refrigerant pipe
Model
Length of
refrigerant pipe
connected to Hydro
/ Outdoor Unit
Item
HWT-40, 60 5 to 30 m
Addition of refrigerant
at the local site is
unnecessary for
refrigerant pipe length
up to 20 m. If the
refrigerant pipe length
exceeds 20 m, add
refrigerant in the amount
given in “Replenishing
refrigerant”
HWT-80, 110 5 to 30 m
Addition of refrigerant
at the local site is
unnecessary for
refrigerant pipe length
up to 8 m. If the
refrigerant pipe length
exceeds 8 m, add
refrigerant in the amount
given in “Replenishing
refrigerant”
HWT-140 5 to 25 m
Caution during addition of refrigerant. Charge the
refrigerant accurately. Overcharging may cause
serious trouble with the compressor.
• Do not connect a refrigerant pipe that is shorter than
5m.
This may cause a malfunction of the compressor or
other devices.
* Do not connect the refrigerant pipe longer than the
maximum length.
■Airtight test
1. Before starting an airtight test, further tighten the
spindle valves on the gas and liquid sides.
2. Pressurize the pipe with nitrogen gas charged from
the service port to the design pressure (4.15 MPa*)
to conduct an airtight test.
3. After the airtight test is completed, evacuate the
nitrogen gas.
* HWT-801/1101/1401H(8)(R)W-E: 4.6 MPa
Air purge
• To purge air, use a vacuum pump.
• Do not use refrigerant charged in the Outdoor Unit to
purge air. (The air purge refrigerant is not contained
in the Outdoor Unit.)
Electricalwiring
• Be sure to fix the power wires and Hydro / Outdoor
connecting wires with clamps so that they do not
come into contact with the cabinet, etc.
Earthing
WARNING
Makesurethatproperearthingisprovided.
Improper earthing may cause an electric shock. For
details on how to check earthing, contact the dealer who
installed the Air to Water Heat Pump or a professional
installation company.
• Proper earthing can prevent charging of electricity
on the Outdoor Unit surface due to the presence of a
high frequency in the frequency converter (inverter)
of the Outdoor Unit, as well as prevent electric
shock. If the Outdoor Unit is not properly earthed,
you may be exposed to an electric shock.
• Besuretoconnecttheearthwire.(Grounding
work)
Incomplete earthing can cause an electric shock. Do
not connect earth wires to gas pipes, water pipes,
lightning rods or earth wires for telephone wires.
Test run
Turn on the leakage breaker at least 12 hours before
starting a test run to protect the compressor during
startup.
■Installation location
WARNING
Install the Outdoor Unit properly in a location that is
durableenoughtosupporttheweightoftheOutdoor
Unit.
Insufficient durability may cause the Outdoor Unit to fall,
which may result in injury.
Pay special attention when installing the unit onto a wall
surface.
CAUTION
Do not install the Outdoor Unit in a location that
issubjecttocombustiblegasleaks.
Accumulation of combustible gas around the Outdoor
Unit may cause a fire.
Install the Outdoor Unit in a location that meets
thefollowingconditionsafterthecustomer’s
consentisobtained.
• A well-ventilated location free from obstacles near
the air inlets and air outlet.
• A location that is not exposed to rain or direct
sunlight.
• A location that does not increase the operating
noise or vibration of the Outdoor Unit.
• A location that does not produce any drainage
problems from discharged water.
• A degree of ventilation shall continue during the
period that the work is carried out.
• The ventilation should safely disperse any released
refrigerant and preferably expel it externally into the
atmosphere.
DonotinstalltheOutdoorUnitinthefollowing
locations.
• A location with a saline atmosphere (coastal area)
or one that is full of sulfide gas (hot-spring area).
• A location subject to oil, vapor, oily smoke, or
corrosive gases.
• A location in which organic solvent is used.
• Places where iron or other metal dust is present. If
iron or other metal dust adheres to or collects on
the interior of the Air to Water Heat Pump, it may
spontaneously combust and start a fire.
• A location where high-frequency equipment
(including inverter equipment, private power
generator, medical equipment, and communication
equipment) is used (Installation in such a location
may cause malfunction of the Air to Water Heat
Pump, abnormal control or problems due to noise
from such equipment).
• A location in which the discharged air of the
Outdoor Unit blows against the window of a
neighboring house.
• A location where the operating noise of the Outdoor
Unit is transmitted.
• When the Outdoor Unit is installed in an elevated
position, be sure to secure its feet.
• A location in which drain water poses any problems.
CAUTION
1. Install the Outdoor Unit in a location where the
discharge air is not blocked.
2. When an Outdoor Unit is installed in a location
that is always exposed to strong winds like a coast
or on the high stories of a building, secure normal
fan operation by using a duct or wind shield.
3. When installing the Outdoor Unit in a location that
is constantly exposed to strong winds such as on
the upper stairs or rooftop of a building, apply the
windproofing measures referred to in the following
examples.
1) Install the unit so that its discharge port faces the
wall of the building.
Keep a distance 500 mm or more between the
unit and wall surface.
2) Consider the wind direction during the operational
season of the Air to Water Heat Pump, and install
the unit so that the discharge port is set at a right
angle relative to the wind direction.
• When using an Air to Water Heat Pump under low
outside temperature conditions, prepare a duct or
snow hood so that it is not affected by the snow.
<Example>
500 mm
Wall
Strong wind
Strong wind
Snow hood
13-EN 14-EN

Outdoor Unit Installation Manual
– 8 –
■Necessary Space for Installation (Unit: mm)
Single unit installation
When there is an obstacle on
the back side
(Front, sides, and top are free)
When there is an obstacle on
the front side
(Back, sides, and top are free)
When there are obstacles on the
front and back sides
(Sides and top are free)
150 or
more 500 or more 150 or
more
1000 or
more
When there are obstacles on the
top and front sides
(Back and sides are free)
When there are obstacles on the
back and top sides
(Front and sides are free)
When there are obstacles on the
back and sides
(Front and top are free)
* The height of the obstacle should be
lower than that of the Outdoor Unit.
1000 or
more
1000 or more
500 or more
150 or
more
150 or
more 300 or
more
200 or
more
Serial unit installation
* When the outdoor temperature is high, the cooling capability may be decreased because of an equipment
protection operation.
When there is an obstacle on
the back side
(Front, sides, and top are free)
When there are obstacles on the
back and top sides
(Front and sides are free)
When there is an obstacle on the
front side
(Back, sides, and top are free)
When there are obstacles on the
back and sides
(Front and top are free)
* The height of the obstacle
should be lower than that of the
Outdoor Unit.
When there are obstacles
on the front and back sides
(Sides and top are free)
Singleunitmultiple-row
installation
(Top and both sides are free)
* The height of the obstacle
should be lower than that of the
Outdoor Unit.
Multipleunitmultiple-rowinstallation
(Top, both sides, and front are free)
300 or
more 300 or
more
200 or
more
300 or
more 300 or
more
200 or
more
500 or more
300 or
more 1000 or
more
300 or
more
150 or
more
200 or
more
300 or
more 300 or
more 300 or
more
200 or
more
2000 or
more
1000 or
more
300 or
more
1500 or
more
200 or more
1000 or more
300 or more 300 or more
300 or more
300 or more
300 or more
300 or more
300 or more
1500 or more
200 or more
300 or more
300 or more 1000 or more
15-EN 16-EN

Outdoor Unit Installation Manual
– 9–
■Installation of Outdoor Unit
• Before installation, check the strength and
horizontalness of the base so that abnormal sounds
do not emanate.
• According to the following base diagram, fix the base
firmly with the anchor bolts.
(Anchor bolt, nut: M10 x 4 pairs)
<HWT-40,60>
 <HWT-80,110,140>
• As shown in the figure below, install the foundation
and vibration-proof rubber pads to directly support
the bottom surface of the fixing leg that is in contact
with and underneath the bottom plate of the Outdoor
Unit.
* When installing the foundation for an Outdoor Unit
with downward piping, consider the piping work.
■For reference
If a heating operation is to be continuously performed
for a long time under the condition that the outdoor
temperature is 0 °C or lower, draining defrosted water
may be difficult due to the bottom plate, drain nipple
and drain hose freezing, resulting in trouble with the
cabinet or fan.
It is recommended to procure an anti-freeze heater
locally in order to safely install the air to water heat
pump.
For details, contact the dealer.
100 100600
108
95
330
351
Drain nipple
mounting hole
Drain hole B
195
195 620
574
70
405
443
Drain hole A
Drain hole ADrain nipple
mounting hole
Drain hole B
Correct
Correct
Incorrect
Foundation
Fixing leg
Foundation
Foundation
If only the end
of the fixing leg
is supported,
it may deform.
Bottom plate of
Outdoor Unit
Do not support
the Outdoor Unit
only with the
fixing leg.
Drain nipple Drain nipple Anti-freeze heater
Drain hose
Insulator
Drain nipple
Drain nipple
Drain nipple
<HWT-40,60>
Waterproof rubber cap A
(4 pcs.)
Waterproof
rubber cap
Base plate
Waterproof rubber cap B
(1 pc.)
Waterproof rubber cap B
(2 pcs.)
Waterproof rubber cap B
(1 pc.)
Waterproof
rubber cap A
(4 pcs.)
15 or less
Support the bottom surface of the fixing leg
that is in contact with and underneath the
bottom plate of the Outdoor Unit.
Set the out margin of the anchor bolt to 15 mm or less.
• When water is to be drained through the drain hose,
attach the following drain nipple and waterproof
rubber cap, and use the drain hose (Inner diam.:
16 mm) sold on the market. Also seal knockout hole
and the screws securely with silicone material, etc.,
to prevent water from leaking.
Some conditions may cause dewing or dripping of
water.
• When collectively draining discharged water
completely, use a drain pan.
 <HWT-80,110,140>
* (HWT-80*H(8)RW-E, HWT-110*H(8)RW-E,
HWT- 140*H(8)RW-E) are not eligible.
Absorb vibration
with vibration
proof rubber
pads
* (HWT-80*H(8)RW-E, HWT-110*H(8)RW-E,
HWT- 140*H(8)RW-E) are not eligible.
17-EN 18-EN

Outdoor Unit Installation Manual
– 10 –
(1)
(3)
(2)
5Refrigerant piping
■Refrigerant Piping
1. Usethefollowingitemsfortherefrigerant
piping.
 Material:Seamlessphosphorousdeoxidized
copperpipe.
 ø6.35,ø9.52,ø12.7Wallthickness0.8mmor
more
 ø15.88Wallthickness1.0mmormore
Donotuseanycopperpipeswithawall
thicknesslessthanthesethicknesses.
Removing service panel
• Remove the screws at 3 locations and slide the
service panel down. Next, detach the right-side
claws followed by left-side claws to remove the
service panel.
When doing this, pulling the service panel towards
the front could damage the claws.
When attaching the service panel, attach the left
claws followed by the right claws and lift the service
panel upwards and secure it with screws in the
3 locations.
 <HWT-80,110,140>
■Knockout of Pipe Cover
Knockout procedure
<HWT-80,110,140>
■Optional Installation Parts
(Locally procured)
<HWT-80,110,140>
■Refrigerant Piping
Connection
CAUTION
Takenoteofthese4importantpointsbelowfor
pipingwork
1. Keep dust and moisture away from inside the
connecting pipes.
2. Tightly connect the connection between pipes
and the unit.
3. Evacuate the air in the connecting pipes using a
VACUUM PUMP.
4. Check for gas leaks at connection points
<HWT-40,60>
Left-side
claws
Service panel
Right-side panel
Right-side
claws
A
Rear direction
Supplied protective bush
Supplied passage hole guard material
* Attach the guard material securely so that it
does not come loose.
Pipe cover
Down direction
• The hydro/outdoor connecting pipes can be
connected in 4 directions.
Take off the knockout part of the pipe cover through
which pipes or wires will pass through the base plate.
• Detach the pipe cover and tap on the knockout
section a few times with the shank of a screwdriver.
A knockout hole can easily be punched.
• After punching out the knockout hole, remove burrs
from the hole and then install the supplied protective
bush and guard material around the passage hole to
protect wires and pipes.
Be sure to attach the pipe covers after pipes have
been connected. Cut the slits under the pipe covers
to facilitate the installation.
After connecting the pipes, be sure to mount the
pipe cover. The pipe cover is easily mounted by
cutting off the slit at the lower part of the pipe cover.
* Be sure to wear heavy work gloves while working.
Flaring
1. Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2. Insert a flare nut into the pipe, and then flare the
pipe.
Use the flare nuts supplied with the Air to Water Heat
Pump or those for R32.
Insert a flare nut into the pipe, and flare the pipe.
Use the flare nuts supplied with the Air to Water Heat
Pump or flare nuts for R32 or R410A.
However, the conventional tools can be used by
adjusting the projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
Rigid (Clutch type)
Outerdia.of
copper pipe R32 or R410A tool used
6.4
0 to 0.5
12.7
15.9
Flaring diameter size: A (Unit: mm)
Outerdia.ofcopperpipe A+0
–0.4
6.4 9.1
12.7 16.6
15.9 19.7
Side direction
Front direction Parts name Q’ty
A
Refrigerant piping
Liquid side: Ø6.4 mm dia
Gas side: Ø15.9 mm dia
One each
BPipe insulating material
(polyethylene foam, 10 mm thick) 1
CPutty, PVC tape One each
Piping connection
Liquid side
Outer diameter Thickness
6.4 mm 0.8 mm
Gas side
Outer diameter Thickness
12.7 mm 0.8 mm
15.9 mm 1.0 mm
Parts name Q’ty
A
Refrigerant piping
Liquid side: Ø6.4 mm dia
Gas side: Ø12.7 mm dia
One each
BPipe insulating material
(polyethylene foam, 6 mm thick) 1
CPutty, PVC tape One each
B
Knockout section
19-EN 20-EN

Outdoor Unit Installation Manual
– 11 –
CAUTION
• Do not scratch the inner surface of the flared part
when removing burrs.
• Flare processing under the condition of scratches on
the inner surface of flare processing part will cause
refrigerant gas leak.
• Check that the flared part is not scratched, deformed,
stepped, or flattened, and that there are no chips
adhered or other problems, after flare processing.
• Do not apply refrigerating machine oil to the flare
surface.
■Tightening of Connecting
Part
1. Align the centers of the connecting pipes and fully
tighten the flare nut with your fingers. Then fix the
nut with a wrench as shown in the figure and tighten
it with a torque wrench.
2. As shown in the figure, be sure to use two wrenches
to loosen or tighten the flare nut of the valve on the
gas side. If you use a single crescent, the flare nut
cannot be tightened to the required tightening
torque.
On the other hand, use a single crescent to loosen
or tighten the flare nut of the valve on the liquid side.
(Unit: N•m)
CAUTION
• Do not put the crescent wrench on the cap.
The valve may break.
• If applying excessive torque, the nut may break
according to some installation conditions.
Outerdia.ofcopperpipe Tightening torque
6.4 mm 14 to 18
12.7 mm 50 to 62
15.9 mm 68 to 82
<HWT-80,110,140>
Valve at gas side
Flare nut
Tightened
Loosened
Flare nut
Wrench for work
Loosened
Tightened
Valve at gas side
Wrench for
fixing
Cap
<HWT-40,60>
• After the installation work, be sure to check for
gas leaks of the pipe connections with nitrogen.
Therefore, using a torque wrench, tighten the flare
pipe connecting sections that connect the hydro/
Outdoor Units at the specified tightening torque.
Incomplete connections may cause not only a gas
leak, but also trouble with the refrigeration cycle.
Do not apply refrigerant machine oil to the flared
surface.
■Refrigerant pipe length
Refrigeration pipe
Outdoor Unit
Model H:Max L:Max L:Min
HWT-40, 60
HWT-80, 110
±30 m
(above or
below)
30 m 5 m
HWT-140
±25 m
(above or
below)
25 m 5 m
Charge port
Use of single wrench is
prohibited
Hydro Unit
L
H
Outdoor Unit
Cap
Incorrect
Incorrect
21-EN 22-EN

Outdoor Unit Installation Manual
– 12 –
6Air purging
■Airtight test
After completing the refrigerant piping work, perform an airtight test. Connect a nitrogen gas cylinder and
pressurize the pipes with nitrogen gas as follows to conduct the airtight test.
■Air purge
Gas leak check
Step 1 ... Pressurize to 0.5 MPa (5 kg/cm2G) for 5 minutes or longer.
Step 2 ... Pressurize to 1.5 MPa (15 kg/cm2G) for 5 minutes or longer.
Step 3 ... Pressurize to 4.15 MPa (42 kg/cm2G) <HWT-40, 60 model> for 24 hours.
Pressurize to 4.6 MPa (46 kg/cm2G) <HWT-80, 110, 140 model> for 24 hours.
(However, note that when the ambient temperature differs during pressurization and after 24 hours, the pressure
will change by approximately 0.01 MPa (0.1 kg/cm2G) per 1°C, so this should be compensated.)
If the pressure drops in steps 1 through 3, check the connections for leakage.
Check for leaks with foaming liquid, etc., take steps to fix the leaks such as brazing the pipes again and tightening
the flare nuts, and then perform the airtight test again.
* After the airtight test is completed, evacuate the nitrogen gas.
Major leaks can be discovered.
Micro leaks can be
discovered.
Low pressure gauge High pressure gauge
Gauge manifold
VL VH
Nitrogen gas
Pressure reducing
valve
Charge port
CAUTION
Never use oxygen, flammable gas, or noxious
gas for the airtight test.
With respect to the preservation of the terrestrial
environment, adopt “Vacuum pump” to purge air
(Evacuate air in the connecting pipes) when installing the
unit.
• Do not discharge the refrigerant gas to the atmosphere
to preserve the terrestrial environment.
• Use a vacuum pump to discharge the air (nitrogen, etc.)
that remains in the set. If air remains, the capacity may
decrease.
For the vacuum pump, be sure to use one with a backflow
preventer so that the oil in the pump does not backflow
into the pipe of the Air to Water Heat Pump when the
pump stops.
(If oil in the vacuum pump is put in an Air to Water Heat
Pump including R32, it may cause trouble with the
refrigeration cycle.)
Compound pressure gauge Pressure gauge
Gauge manifold valve–101 kPa
(–76 cmHg)
Charge hose
(For R32 or
R410A only)
Charge port
(Valve core
(Setting pin))
Handle Low Handle High
(Keep fully closed)
Charge hose
(For R32 or R410A only)
Packed valve at gas side
Vacuum
pump
Vacuum pump
adapter for backflow
prevention
(For R32 or R410A
only)
23-EN 24-EN

Outdoor Unit Installation Manual
– 13 –
Vacuum pump
As shown in the figure, connect the charge hose after the
manifold valve is closed completely.
Open the valve stem or valve handle fully. (First, at liquid
side, then gas side)
Open Handle Low fully.
Close Handle Low completely.
Attach the connecting port of the charge hose with a
projection to push the valve core (setting pin) to the charge
port of the set.
Leave the vacuum pump as it is for 1 or 2 minutes, and check
that the indicator of the compound pressure gauge does not
return.
Turn ON the vacuum pump. (*1)
Retighten the flare nut.
Turn OFF the vacuum pump.
Disconnect the charge hose from the charge port.
Tighten the valve and caps of the charge port securely.
Loosen the flare nut of the packed valve (Gas side) a little to
check that the air passes through. (*2)
Execute vacuuming until the compound pressure gauge
indicates –101 kPa (–76 cmHg). (*1)
*1 Use the vacuum pump, vacuum pump adapter, and
gauge manifold correctly referring to the manuals
supplied with each tool before using them.
Check that the vacuum pump oil is filled up to the
specified line of the oil gauge.
*2 When air is not charged, check again whether the
connecting port of the discharge hose, which has a
projection to push the valve core, is firmly connected to
the charge port.
■HowtoOpentheValve
Fully open the valves of the Outdoor Unit. (First fully
open the valve on the liquid side, and then fully open
the valve on the gas side.)
* Do not open or close the valves when the ambient
temperature is -20°C or less. Doing so may damage
the valve O-rings and result in refrigerant leakage.
Liquid side
Open the valve with hexagon wrench.
Model HWT- Hexagonwrenchsize
40
60
80
110
140
4 mm
Gas side
<HWT-80,110,140>
Service valve
Open the valve with hexagon wrench.
Hexagon wrench size : 5 mm
<HWT-40,60>
Service valve
Open the valve with hexagon wrench.
Hexagon wrench size : 4 mm
Cap tightening torque
Cap tightening torque
Valve size Ø6.4 mm 14 to 18 N•m
(1.4 to 1.8 kgf•m)
Ø12.7 mm 33 to 42 N•m
(3.3 to 4.2 kgf•m)
Ø15.9 mm 33 to 42 N•m
(3.3 to 4.2 kgf•m)
Charge port 14 to 18 N•m
(1.4 to 1.8 kgf•m)
■Replenishing Refrigerant
This model is a 8 m* chargeless type that does not
need to have its refrigerant replenished for refrigerant
pipes up to 8 m*. When a refrigerant pipe longer than
8 m* is used, add the specified amount of refrigerant.
* HWT-40, 60: 20m
Refrigerant replenishing procedure
1. After vacuuming the refrigerant pipe, close the
valves and then charge the refrigerant while the Air
to Water Heat Pump is not working.
2. When the refrigerant cannot be charged to the
specified amount, charge the required amount of
refrigerant from the charge port of the valve on the
gas side during cooling.
• Ensure that contamination of different refrigerants
does not occur when using charging equipment.
Hoses or lines shall be as short as possible to
minimise the amount of refrigerant contained in
them.
• Cylinders shall be kept in an appropriate position
according to the instructions.
• Ensure that the refrigerating system is earthed prior
to charging the system with refrigerant.
• Label the system when charging is complete (if not
already).
• Extreme care shall be taken not to overfill the
refrigerating system.
• Prior to recharging the system, it shall be pressure-
tested with the appropriate purging gas.
• The system shall be leak-tested on completion of
charging but prior to commissioning. A follow up
leak test shall be carried out prior to leaving the
site.
Requirement for replenishing refrigerant
Replenish liquid refrigerant.
When gaseous refrigerant is replenished, the
refrigerant composition varies, which disables normal
operation.
Adding additional refrigerant
Model
HWT- Pipe length: L
Adding
additional
refrigerant
Maximum
refrigerant
charge
amount
401HW-E
601HW-E 20–30 m: L 20 g × (L-20) 200g
801H(R)W-E
1101H(R)W-E 8–30 m: L 25 g × (L-8) 550g
801H8(R)W-E
1101H8(R)W-E
1401H(R)W-E
1401H8(R)W-E
8–25 m :L 25 g × (L-8) 425g
Charge port
Valve unit
Flare nut
Valve stem
cap
Valve stem
4 mm
<HWT-40,60>
The refrigerant need not be reduced for a 20 meter (or
less) refrigerant pipe.
<HWT-80,110,140>
• The refrigerant need not be reduced for a 8 meter
(or less) refrigerant pipe.
Gas leak inspection
Use a leak detector manufactured specially for
HFCrefrigerant(R32,R410A,R134a,etc.)to
performtheR32gasleakinspection.
* Leak detectors for conventional HCFC
refrigerant(R22,etc.)cannotbeused,asthe
sensitivitydropstoapproximately1/40when
usedforHFCrefrigerant.
• R32 has a high working pressure, so failure to
perform the installation work properly may result in
gas leaks such as when the pressure rises during
operation. Be sure to perform leak tests on the piping
connections.
• Under no circumstances shall potential sources of
ignition be used in the searching for or detection of
refrigerant leaks. A halide torch (or any other
detector using a naked flame) shall not be used.
• Electronic leak detectors may be used to detect
refrigerant leaks but, in the case of flammable
refrigerants, the sensitivity may not be adequate, or
may need re-calibration.
• Ensure that the detector is not a potential source of
ignition and is suitable for the refrigerant used. Leak
detection equipment shall be set at a percentage of
the LFL of the refrigerant and shall be calibrated to
the refrigerant employed, and the appropriate
percentage of gas (25 % maximum) is confirmed.
• Leak detection fluids are also suitable for use with
most refrigerants but the use of detergents
containing chlorine shall be avoided as the chlorine
may react with the refrigerant and corrode the
copper pipe-work.
• If a leak is suspected, all naked flames shall be
removed/extinguished.
• If a leakage of refrigerant is found which requires
brazing, all of the refrigerant shall be recovered from
the system, or isolated (by means of shut off valves)
in a part of the system remote from the leak.
25-EN 26-EN

Outdoor Unit Installation Manual
– 14 –
■Insulating the Pipes
• The temperatures at both the liquid side and gas side
will be low during cooling so in order to prevent
condensation, be sure to insulate the pipes at both of
these sides.
• Insulate the pipes separately for the liquid side and
gas side.
REQUIREMENT
Be sure to use an insulating material which can
withstand temperatures above 120°C for the gas side
pipe since this pipe will become very hot during heating
operations.
<HWT-80,
110,140>
<HWT-40,60>
Fillinthelabelasfollows:
Model HWT- Pre-charged refrigerant
401HW-E
601HW-E 0.9 kg
801H(R)W-E
1101H(R)W-E 1.25 kg
801H8(R)W-E
1101H8(R)W-E 1.30 kg
1401H(R)W-E
1401H8(R)W-E 1.40 kg
Pre-charged refrigerant
at factory [kg], specified
in the nameplate
Additional charge on
installation site [kg]
GWP x kg
1000
Hydro Unit inspection locations
(piping connections)
Outdoor Unit inspection locations
Outdoor Unit inspection locations
Hydro Unit side piping
■ToFixtheFluorinated
Greenhouse Gases Label
This product contains fluorinated greenhouse gases.
Do not vent gases into the atmosphere.
Contains fluorinated greenhouse gases
• Chemical Name of Gas R32
• Global Warming Potential (GWP) of Gas 675
CAUTION
1. Stick the enclosed refrigerant label adjacent to the
service ports for charging or recovering location and
where possible adjacent to existing nameplates or
product information label.
2. Clearly write the charged refrigerant quantity on the
refrigerant label using indelible ink. Then, place the
included transparent protective sheet over the label
to prevent the writing from rubbing off.
3. Prevent emission of the contained fluorinated
greenhouse gas. Ensure that the fluorinated
greenhouse gas is never vented to the atmosphere
during installation, service or disposal. When any
leakage of the contained fluorinated greenhouse gas
is detected, the leak shall be stopped and repaired as
soon as possible.
4. Only qualified service personnel are allowed to
access and service this product.
5. Any handling of the fluorinated greenhouse gas in
this product, such as when moving the product or
recharging the gas, shall comply under (EU)
Regulation No. 517/2014 on certain fluorinated
greenhouse gases and any relevant local legislation.
6. Periodical inspections for refrigerant leaks may be
required depending on European or local legislation.
7. Contact dealers, installers, etc., for any questions.
27-EN 28-EN
Refrigerant
piping

Outdoor Unit Installation Manual
– 15 –
7 Electricalwork
WARNING
1. Usingthespecifiedwires,ensurethatthewires
areconnected,andfixwiressecurelysothatthe
externaltensiontothewiresdoesnotaffectthe
connectingpartoftheterminals.
Incomplete connection or fixation may cause a fire,
etc.
2. Besuretoconnecttheearthwire.(Grounding
work)
Incompleteearthingmayleadtoelectricshock.
Do not connect earth wires to gas pipes, water pipes,
lightning rods or earth wires for telephone wires.
3. The appliance shall be installed in accordance
withnationalwiringregulations.
Capacity shortages of the power circuit or an
incomplete installation may cause an electric shock
or fire.
CAUTION
• An installation fuse must be used for the power supply
line of this Air to Water Heat Pump.
• Incorrect / incomplete wiring may lead to an electrical
fire or smoke.
• Prepare an exclusive power supply for the Air to Water
Heat Pump.
• This product can be connected to the mains power.
Fixed wire connections:
A switch that disconnects all poles and has a contact
separation of at least 3 mm must be incorporated in
the fixed wiring.
• Be sure to use the cord clamps attached to the
product.
• Do not damage or scratch the conductive core or inner
insulator of the power and hydro/outdoor connecting
wires when peeling them.
• Use the power and hydro/outdoor connecting wires
with specified thicknesses, specified types and
protective devices required.
• Check that cabling will not be subject to wear,
corrosion, excessive pressure, vibration, sharp edges
or any other adverse environmental effects.
The check shall also take into account the effects of
aging or continual vibration from sources such as
compressors or fans.
<HWT-40,60>
1. Remove valve cover screw.
2. Pull the valve cover downward to remove it.
<HWT-80,110,140>
1. Remove the service panel, and the terminal cover.
2. A conduit pipe can be installed through the hole for
wiring. If the hole size does not fit the wiring pipe to
be used, drill the hole again to an appropriate size.
3. Be sure to clamp the power wires and hydro/outdoor
connecting wires with a cord clamp along the
connecting pipe so that the wires do not touch the
compressor or discharge pipe.
(The compressor and the discharge pipe become
hot.)
■WiringbetweenHydroUnitandOutdoorUnit
The dashed lines show on-site wiring.
Connect the system interconnection wires to the identical terminal numbers on the terminal block of each unit.
Incorrect connection may cause a failure.
<HWT-***H(R)W>
Terminal cover
Service panel
Valve cover
Power wire
Hydro/outdoor
connecting wires
For the Air to Water Heat Pump, connect a power wire with the following specifications.
Model HWT- 401HW 601HW 801H(R)W 1101H(R)W
Powersupply 220-240 V ~ 50 Hz
Maximumrunningcurrent 14.6 A 20.3 A
Recommended field fuse 16 A 25 A
Powersupplywire* 2 × 2.5 mm2or more (H07 RN-F or 60245 IEC 66)
Outdoorearthwire 1 × 2.5 mm2or more
Hydro/Outdoorconnectingwires* 4 × 1.5 mm2or more (H07 RN-F or 60245 IEC 66)
* Number of wire × wire size
Model HWT- 1401H(R)W
Powersupply 220-240 V ~ 50 Hz
Maximumrunningcurrent 28.8 A
Recommended field fuse 32A
Powersupplywire* 2 × 4 mm2or more (H07 RN-F or 60245 IEC 66)
Outdoorearthwire 1 × 4 mm2or more
Hydro/Outdoorconnectingwires* 4 × 1.5 mm2or more (H07 RN-F or 60245 IEC 66)
* Number of wire × wire size
Model HWT- 801H8W-E
801H8RW-E
1101H8W
1101H8RW
1401H8W
1401H8RW
Powersupply 380-415 V 3N~ 50 Hz
Maximumrunningcurrent 14.6 A
Recommended field fuse 16A
Powersupplywire* 4 × 2.5 mm2or more (H07 RN-F or 60245 IEC 66)
Outdoorearthwire 1 × 2.5 mm2or more
Hydro/Outdoorconnectingwires* 4 × 1.5 mm2or more (H07 RN-F or 60245 IEC 66)
* Number of wire × wire size
Outdoor Unit
11
L
N22
33
Earth
Leakage circuit breaker
30 mA
Input power
220-240 V ~, 50 Hz
Hydro Unit
29-EN 30-EN
<HWT-***H8(R)W> Outdoor Unit
Leakage breaker
Input power
380-400 V 3N~, 50 Hz
Hydro Unit
Earth

Outdoor Unit Installation Manual
– 16 –
AD
LN
123
A
10
10
LN
40
10
50
50
10
30
123
Howtowire
1. Connect the system interconnection wire to the
terminal as identified with their respective numbers
on the terminal block of the Hydro and Outdoor
Units.
H07 RN-F or 60245 IEC 66 (1.5 mm2or more)
2. When connecting the system interconnection wire to
the Outdoor Unit terminal, prevent water from
coming into the Outdoor Unit.
3. Insulate the unsheathed cords (conductors) with
electrical insulation tape. Process them so that they
do not touch any electrical or metal parts.
4. For interconnecting wires, do not use a wire joined
to another on the way.
Use wires long enough to cover the entire length.
5. Fix power supply wire and system interconnection
wire.
<HWT-40, 60>
• Be sure to use the cord clamps attached to the
product.
<HWT-80, 110, 140>
• Fix each wire tightly to the valve fixing plate with the cable
tie specified below. Measure the diameter of the wire to
be fixed, and fasten the wire with the supplied cable tie
(T50R-HSW from HellermannTyton) so that length A of the
surplus portion of the tie satisfies the following expression:
A = 183 - L
A: Minimum length of surplus portion of cable tie (mm)
L: Circumferential length of wire (mm)
L = Diameter of wire D (mm) × π
• Cut off the tie surplus portion (A) of the cable tie.
CAUTION
• An installation fuse must be used for the power supply
line of this Air to Water Heat Pump.
• Incorrect / incomplete wiring may lead to an electrical
fire or smoke.
• Prepare a dedicated power supply for the Air to Water
Heat Pump.
• This product can be connected to the mains power.
Fixed wire connections:
A switch that disconnects all poles and has a contact
separation of at least 3 mm must be incorporated in
the fixed wiring.
<HWT-80,110,140>
<Single-phase model>
Strippinglengthpowersupplywireand
systeminterconnectionwire
To Hydro Unit
terminal block
Power supply
terminal block
Earth
screw
Earth
screw
Pipe valve
fixing plate Cable tie
Power supply wire
System
interconnection wire
Details of A
Pipe valve
fixing plate
Cable tie
Cable tie
Wire
Wire
Power supply
wire
System
interconnection
wire
Earth wire
Earth wire (mm)
123LN123LN
LN
123
40
30
30
40
10
10 10
10
<HWT-40,60>
Strippinglengthpowercordand
connectingwire
Connecting wire
Earth line Earth line
(mm)
Power wire
Terminal block
Screw
Connecting wire
Cord clamp
Power wire
31-EN 32-EN
10
40
50
10 L1 L2 L3 N
(mm)
(mm)
50 30
Strippinglengthpowersupplywireand
indoor/outdoorconnectingwires
Power supply
wire
Indoor/outdoor
connecting wires
Earth lineEarth wire
10
40
50
10 L1 L2 L3 N
(mm)
(mm)
50 30
<HWT-80,110,140>
<Three-phase model>
Earth
screw
Cable tie
Power supply wire
Indoor/outdoor
connecting wires
Value fixing
plate
(Please see AIR CONDITIONER IM 2H30051301 )

Outdoor Unit Installation Manual
– 17 –
8Earthing
WARNING
Besuretoconnecttheearthwire.(Groundingwork)
Incomplete earthing may cause an electric shock.
Connect the earth wire properly following applicable
technical standards.
Connecting the earth wire is essential to preventing
electric shock and to reducing noise and electrical
charges on the Outdoor Unit surface due to the high-
frequency wave generated by the frequency converter
(inverter) in the Outdoor Unit.
If you touch the charged Outdoor Unit without an earth
wire, you may experience an electric shock.
9Finishing
After the refrigerant pipe, Hydro / Outdoor connecting
wires have been connected, cover them with finishing
tape and clamp them to the wall with off-the-shelf
support brackets or their equivalent.
Keep the power wires and Hydro / Outdoor connecting
wires off the valve on the gas side or pipes that have
no heat insulator.
10 Test run
• Turn on the leakage circuit breaker at least 12 hours
before starting a test run to protect the compressor
during startup.
• Check the following before starting a test run:
• Thatallpipesareconnectedsecurelywithout
leaks.
• Thatthevalveisopen.
If the compressor is operated with the valve
closed, the Outdoor Unit will become
overpressurized, which may damage the
compressor or other components.
If there is a leak at a connection, air can be sucked in
and the internal pressure further increases, which may
cause a burst or injury.
• Operate the Air to Water Heat Pump in the correct
procedure as specified in the Owner’s Manual.
Please refer to the Hydro Unit installation manual for
the detail of the test run.
11 Annual
maintenance
• For an Air to Water Heat Pump system that
is operated on a regular basis, cleaning and
maintenance of the Hydro / Outdoor Units are
strongly recommended.
As a general rule, if an Hydro Unit is operated for
about 8 hours daily, the Hydro / Outdoor Units will
need to be cleaned at least once every 3 months.
This cleaning and maintenance should be carried out
by a qualified service person.
Failure to clean the Hydro / Outdoor Units regularly
will result in poor performance, icing, water leaking
and even compressor failure.
12 Air to Water Heat
Pump operating
conditions
For proper performance, operate the Air to Water Heat
Pump under the following temperature conditions:
<HWT-40,60>
Cooling operation 10 °C to 43 °C
Heating operation –20 °C to 25 °C
Hot water operation –20 °C to 43 °C
<HWT-80,110,140>
Cooling operation 10 °C to 43 °C
Heating operation –20 °C to 25 °C
Hot water operation –20 °C to 43 °C
If Air to Water Heat Pump is used outside of the above
conditions, safety protection may work.
13 Functions to be implemented locally
■Handlingexistingpipe
When using the existing pipe, carefully check for the following:
• Wall thickness (within the specified range)
• Scratches and dents
• Water, oil, dirt, or dust in the pipe
• Flare looseness and leakage from welds
• Deterioration of copper pipe and heat insulator
Cautionsforusingexistingpipe
• Do not reuse a flare nut to prevent gas leaks.
Replace it with the supplied flare nut and then process it to a flare.
• Blow nitrogen gas or use an appropriate means to keep the inside of the pipe clean. If discolored oil or much
residue is discharged, wash the pipe.
• Check welds, if any, on the pipe for gas leaks.
When the pipe corresponds to any of the following, do not use it. Install a new pipe instead.
• The pipe has been opened (disconnected from Hydro Unit or Outdoor Unit) for a long period.
• The pipe has been connected to an Outdoor Unit that does not use refrigerant R22, R410A or R407C.
• The existing pipe must have a wall thickness equal to or larger than the following thicknesses.
Reference outside
diameter (mm) Wall thickness (mm)
Ø6.4 0.8
Ø12.7 0.8
Ø15.9 1.0
• Do not use any pipe with a wall thickness less than these thicknesses due to insufficient pressure capacity.
33-EN 34-EN

Outdoor Unit Installation Manual
– 18 –
■Refrigerant Recovery
When recovering the refrigerant in situations such as when relocating an Hydro Unit or Outdoor Unit, the recovery
operation can be performed by operating the SW01 and SW02 switches on the P.C. board of the Outdoor Unit.
A cover for the electric parts has been installed in order to provide protection from electric shocks while work is
being performed. Operate the service switches and check the LED displays with this electric parts cover in place.
Do not remove this cover while the power is still on.
DANGER
The entire P.C. board of this Air to Water Heat Pump system is a high-voltage area.
When operating the service switches with the power of the system left on, wear electrically insulated gloves.
* In the initial LED display status, D805 is lighted as shown on the table below. If the initial status is not established
(if D805 is flashing), hold down the SW01 and SW02 service switches simultaneously for at least 5 seconds to
return the LED displays to the initial status.
• There are four LEDs display patterns.

D800
(Yellow)

D800
(Yellow)

D800
(Yellow)

D800
(Yellow)

D800
(Yellow)

D800
(Green)
: ON
: OFF
: Rapid flashing (5 times/sec.)
: Slow flashing (1 time/sec.)
LED displays
LED displays Service switches
(Fig. 1)
LEDdisplaysindicatedwhenstep3istaken
D800 D801 D802 D803 D804 D805
: ON, : OFF, : Slow flashing
Refrigerant recovery LED display
D800 D801 D802 D803 D804 D805
: ON, : OFF, : Rapid flashing
(Fig. 2)
LED display initial status
D800
(Yellow)
D801
(Yellow
D802
(Yellow)
D803
(Yellow)
D804
(Yellow)
D805
(Green)
or or or or or
OFF or Rapid
ashing OFF or Rapid ashing OFF or Rapid ashing OFF or Rapid ashing OFF or Rapid ashing ON
* In order to reduce standby power, the LED indication may be turned off even when the power is on. When either
SW01 or SW02 is pressed, the LED is displayed.
Steps taken to recover the refrigerant
1. Operate the Hydro Unit in the pump mode.
2. Check that the LED displays are placed in their initial status. If not, place them in the initial status.
3. Hold down SW01 for at least 5 seconds, and check that D804 flashes slowly. (Fig. 1)
4. Press SW01 once to set the LED displays (D800 to D805) to the “refrigerant recovery LED display” shown below.
(Fig. 2)
5. Press SW02 to set D805 to rapid flashing. (Each time SW02 is pressed, D805 is switched between rapid flashing
and OFF.) (Fig. 3)
6. Hold down SW02 for at least 5 seconds, and when D804 flashes slowly and D805 lights, the forced cooling
operation is started. (Max. 10 minutes) (Fig. 4)
7. After operating the system for at least 3 minutes, close the valve on the liquid side.
8. After the refrigerant has been recovered, close the valve on the gas side.
9. Hold down SW01 and SW02 simultaneously for at least 5 seconds. The LED displays are returned to the initial
status, and the cooling operation stop.
10. Turn off the power.
* If there is any reason to doubt whether the recovery was successful in the course of this operation, hold down
SW01 and SW02 simultaneously for at least 5 seconds to return to the initial status, and then repeat the steps
for recovering the refrigerant.
(Fig. 3)
LEDdisplaysindicatedwhenstep5istaken
D800 D801 D802 D803 D804 D805
: ON, : OFF, : Rapid flashing
LEDdisplaysindicatedwhenstep6istaken
D800 D801 D802 D803 D804 D805
: ON, : OFF, : Slow flashing
(Fig. 4)
35-EN 36-EN

Outdoor Unit Installation Manual
– 19 –
14 Troubleshooting
You can perform failure diagnosis of the Outdoor Unit with the LEDs on the P.C. board of the Outdoor Unit in
addition to using the check codes displayed on the wired remote controller of the Hydro Unit.
Use the LEDs and check codes for various checks. Details of the check codes displayed on the wired remote
controller of the Hydro Unit are described in the Installation Manual of the Hydro Unit.
■LED Displays and Check Codes
No. Trouble description LED display
D800 D801 D802 D803 D804 D805
1Normal
2Discharge temp. sensor (TD)
trouble
3Heat exchanger temp. sensor (TE)
trouble
4Heat exchanger temp. sensor (TL)
trouble
5Outside air temp. sensor (TO)
trouble
6Suction temp. sensor (TS) trouble
7Heat sink temp. sensor (TH) trouble
8Miss-mounting of sensor (TE, TS)
9EEPROM trouble
10 Compressor break down
11 Compressor lock
12 Current detection circuit trouble
13 Case thermostat operation
14 Unset model type of P.C.board
15 MCU communication trouble
16 Discharge temp. trouble
17 High pressure SW operation
18 Power supply trouble
19 Heat sink overheat trouble
20 Gas leak detection
21 4-way valve inverse trouble
22 High pressure protective operation
23 Fan system trouble
24 Short-circuit of compressor drive
element
25 Position detection circuit trouble
26 High pressure sensor (Pd) trouble
27 Combination failure between the
Hydro Unit
: ON, : OFF, : Rapid flashing (5 times/sec)
15 Appendix
■Existingpiping
Work instructions
The existing R410A piping can be reused for our R32
product installations.
WARNING
Confirmingtheexistenceofscratchesordentson
theexistingpipesandconfirmingthereliabilityof
the pipe strength are conventionally referred to the
localsite.
Ifthespecifiedconditionscanbecleared,itis
possibletoupdateexistingR22andR407Cpipesto
thoseforR32models.
Basicconditionsneededtoreuseexisting
pipes
Check and observe the presence of three conditions in
the refrigerant piping works.
1. Dry (There is no moisture inside of the pipes.)
2. Clean (There is no dust inside of the pipes.)
3. Tight (There are no refrigerant leaks.)
Restrictionsforuseofexistingpipes
Inthefollowingcases,theexistingpipesshould
notbereusedastheyare.Cleantheexistingpipes
orexchangethemwithnewpipes.
1. When a scratch or dent is heavy, be sure to use new
pipes for the refrigerant piping works.
2. When the existing pipe thickness is thinner than the
specified “Pipe diameter and thickness,” be sure to
use new pipes for the refrigerant piping works.
• The operating pressure of R32 is high. If there is a
scratch or dent on the pipe or a thinner pipe is
used, the pressure strength may be inadequate,
which may cause the pipe to break in the worst
case.
* Pipe diameter and thickness (mm)
Reference
outside diameter
(mm)
Wall thickness
(mm) Material
Φ6.4 0.8 –
Φ12.7 0.8 –
Φ15.9 1.0 –
• In case the pipe diameter is Φ12.7 mm dia or less
and the thickness is less than 0.7 mm, be sure to
use new pipes for the refrigerant piping works.
<HWT-80,110,140>
<HWT-40,60>
LED
LED
(D800 to D805)
(D800 to D805)
SW02
SW01
SW01
SW02
3. When the Outdoor Unit was left with the pipes
disconnected, or the gas leaked from the pipes and
the pipes were not repaired and refilled.
• There is the possibility of rain water or air,
including moisture, entering the pipe.
4. When refrigerant cannot be recovered using a
refrigerant recovery unit.
• There is the possibility that a large quantity of dirty
oil or moisture remains inside the pipes.
5. When a commercially available dryer is attached to
the existing pipes.
• There is the possibility that copper green rust has
been generated.
6. When the existing Air to Water Heat Pump is
removed after refrigerant has been recovered.
Check if the oil is judged to be clearly different from
normal oil.
• The refrigerator oil is copper rust green in color:
There is the possibility that moisture has mixed
with the oil and rust has been generated inside the
pipe.
• There is discolored oil, a large quantity of residue,
or a bad smell.
• A large quantity of shiny metal dust or other wear
residue can be seen in the refrigerant oil.
7. When the Air to Water Heat Pump has a history of
the compressor failing and being replaced.
• When discolored oil, a large quantity of residue,
shiny metal dust, or other wear residue or mixture
of foreign matter is observed, trouble will occur.
8. When temporary installation and removal of the Air
to Water Heat Pump are repeated such as when
leased, etc.
9. If the type of refrigerator oil of the existing Air to
Water Heat Pump is other than the following oil
(Mineral oil), Suniso, Freol-S, MS (Synthetic oil),
alkyl benzene (HAB, Barrel-freeze), ester series,
PVE only of ether series.
• The winding-insulation of the compressor may
deteriorate.
NOTE
The above descriptions are results have been confirmed
by our company and represent our views on our Air to
Water Heat Pump, but do not guarantee the use of the
existing pipes of Air to Water Heat Pump that have
adopted R32 or R410A in other companies.
37-EN 38-EN