8
Installation plate
4
Screws
5
Note: Do not lift the
Indoor Unit by holding the
refrigerant and water pipes
to prevent damage of the
pipes.
Typical Piping Installation
Air-to-Water Heatpump
Outdoor Unit
Temporary
connection to
be removed
immediately
after fi lling
Double Check
Valve assembly
is acceptable in
house
Servicing
Valve
Fan Coil Unit
Radiator/
Floor Heater
2-Way Valve
Servicing
Valve
Main
Water
Supply
Water piping installation
• Water inlet and water outlet in Indoor Unit are used for connection to water circuit.
Please request a licensed technician to install this water circuit.
• This water circuit must comply with all relevant European and national
regulations, i.e. IEC/EN 61770.
• Do not use worn out tube or detachable hose-set.
• Be careful not to deform the piping to excessive force when doing piping
connection job.
• Use Rp 1¼" nut for both water inlet and outlet connection and clean all pipings
with tap water before connecting to the Indoor Unit.
• Cover the pipe end to prevent dirt and dust when inserting it through a wall.
• Choose proper sealer which can withstand the pressure and temperature
of the system.
• If an existing tank is to be connected to this Indoor Unit, ensure the pipes are
clean before water pipe installation is carried out.
• Be sure to use two spanners to tighten the connection. Tighten the nuts with
torque wrench: 117.6N•m.
Torque wrench
Indoor Unit
Spanner
• If non-brass metallic piping is used for installation, make sure to insulate the pipes
to prevent galvanic corrosion.
• Make sure to insulate the water circuit pipes to prevent reduction of heating capacity.
• After installation, check the water leakage condition in connection area during test run.
Water Inlet
Water Outlet
CAUTION
Do not over tighten, over tightening cause water leakage.
Refrigerant piping installation
1. Please make fl are after inserting fl are nut (located at joint portion of tube
assembly) onto the copper pipe. (In case of using long piping)
2. Do not use pipe wrench to open refrigerant piping. Flare nut may be broken
and cause leakage. Use proper spanner or ring wrench.
3. Connect the piping:
• Align the center of piping and suffi ciently tighten the fl are nut with fi ngers.
• Be sure to use two spanners to tighten the connection. Further tighten
the fl are nut with torque wrench in specifi ed torque as stated in the table.
Torque wrench
Spanner or Wrench
Model Piping size (Torque)
Use Reducing
Adapter
6
Indoor Unit Outdoor Unit Gas Liquid
WH-SDC0309K3E5,
WH-SDC0309K6E5
WH-UDZ03KE5*
ø12.7mm
(1/2")
[55 N•m]
ø6.35mm
(1/4")
[18 N•m]
Yes
WH-UDZ05KE5*,
WH-UDZ07KE5*,
WH-UDZ09KE5*
ø15.88mm
(5/8")
[65 N•m]
ø6.35mm
(1/4")
[18 N•m]
No
WH-SXC09K3E5,
WH-SXC09K6E5,
WH-SXC12K6E5
WH-UXZ09KE5*,
WH-UXZ12KE5*
ø12.7mm
(1/2")
[55 N•m]
ø6.35mm
(1/4")
[18 N•m]
____
Liquid Refrigerant Pipe
Gas Refrigerant Pipe
CAUTION
Do not overtighten, overtightening may cause gas leakage.
Do not pull and push refrigerant piping excessively, deformed pipe
may cause refrigerant leak.
Please take extra precaution when open the control board cover 6
and control board 7 for Indoor Unit installation and servicing. Failure
to do so may cause injury.
Additional Precautions For R32 Models when connecting by fl aring at indoor
side
Ensure to do the re-fl aring of pipes before connecting to units
to avoid leaking.
Connections made between components of refrigerant
system shall be accessible for ease of maintenance.
Seal suffi ciently the fl are nut (both gas and liquid sides) with neutral cure
(Alkoxy type) & ammonia-free silicone sealant and insulation material to avoid
the gas leak caused by freezing.
Apply neutral cure
(Alkoxy type) and
ammonia-free silicone
sealant along the
circumference
Neutral cure (Alkoxy type) & ammonia-free silicone sealant is only to be applied
after pressure testing and cleaning up by following instructions of sealant, only to
the outside of the connection. The aim is to prevent moisture from entering the
connection joint and possible occurrence of freezing. Curing sealant will take some
time. Make sure sealant will not peel off when wrapping the insulation.
Checking for gas leakage
• Check for leakage of gas after air purging.
• See the in the installation manual for the outdoor.
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