53
Installation and Maintenance
Service Manual
8. Installation
Use bolts to secure the unit to a flat, solid floor.
When mounting the unit on a wall or the roof, make
sure the support is firmly secured so that it cannot
move in the event of intense vibrations or a strong
wind.
Do not install the outdoor unit in pits or air vents
Use suitable connecting pipes and equipment for the
refrigerant R410A.
Wrap all the refrigerant pipes and joints.
Tighten the connections using two wrenches working
in opposite directions.
Humid air left inside the refrigerant
circuit can cause com-
pressor malfunction. After having connected the indoor
and outdoor units, bleed the air and humidity from the
refrigerant circuit using a vacuum pump.
1.Unscrew and remove the caps from the 2-way and 3-
way valves.
2.Unscrew and remove the cap from the service valve.
3.Connect the vacuum pump hose to the service valve.
4.Operate the vacuum pump for 10-15 minutes until an
absolute vacuum of 10 mm Hg has been reached.
5.With the vacuum pump still in operation, close the
low-pressure knob on the vacuum pump coupling. Stop
the vacuum pump.
6.Open the 2-way valve by 1/4 turn and then close it
after 10 seconds
.
Check all the joints for leaks using
liquid soap or an electronic leak device.
7.Turn the body of the 2-way and 3-way valves. Discon-
nect the vacuum pump hose.
8.Replace and tighten all the caps on the valves.
INDOOR
UNIT
Install the drain fitting and the drain hose(for
model with heat pump only)
Condensation is produced and flows from the outdoor unit
when the appliance is operating in the heating mode. In order
not to disturb neighbours and to respect the environment,
install a drain fitting and a drain hose to channel the conden-
sate water. Install the drain fitting and rubber washer on the
outdoor unit chassis and connect a drain hose to it as shown
in the figure.
Vacuum pump
Vacuum pump
Vacuum pump
Connect to the
indoor unit
Twisting moment (N.m)
Diameter (mm)
14-18N m(140-180kgf.cm)
18K unit need to be installed the indoor unit
conversion joint
Caution: Installation Must be Performed in Accordance
with the NEC/CEC by Authorized Personnel Only.
(8) Secure
18K Model:
Installing the pipes
Φ6.35(1/4”)
Φ9.52(3/8”)
Φ12.7(1/2”)
2-way valve
Refrigerant fluid direction of flow
3-way valve
Service
inlet
(8) Secure
Valve cap
Valve cap
(2) Turn
(2) Turn
(2) Turn
(8) Secure
(7) Turn to open fully
(7) Turn to open fully
(6) Open by 1/4 turn
Models(m)
14/18K GWHD(24)NK3DO 24/28K
Max. connection
pipe length
20
20
70
Max. connection
pipe length(Simple
one indoor unit)
10
10
20
The refrigerant pipes must not exceed the maximum
heights
10m.
.
34-42N m(340-420kgf.cm)
.
49-61N m(490-610kgf.cm)
.
8.2 Installing the Outdoor Unit
Use bolts to secure the unit to a flat, solid floor.
When mounting the unit on a wall or the roof, make sure the
support is firmly secured so that it cannot move in the event of
intense vibrations or a strong wind.
Do not install the outdoor unit in pits or air vents.
Installing the pipes
Use suitable connecting pipes and equipment for the refrigerant
R32.
Models(m)
14Kx2
/18Kx2
21Kx3
/24Kx3
28Kx4
36Kx4
42Kx5
Max. connection pipe length
40
60
70
80
100
Max. connection pipe length
(Simpleone indoor unit)
20
20
20
25
25
The sum of the capacity codes of the indoor units should be
among 50%-150% of that of the outdoor unit.
The refrigerant pipes must not exceed the maximum heights
5m.
Wrap all the refrigerant pipes and joints.
Tighten the connections using two wrenches working in
opposite directions.
Caution: Installation Must be Performed in Accordance with
the NEC/CEC by Authorized Personnel Only.
Humid air left inside the refrigerant circuit can cause compressor
malfunction. After having connected the indoor and outdoor units,
bleed the air and humidity from the refrigerant circuit using a
vacuum pump.
(1) Unscrew and remove the caps from the 2-way and 3-way
valves.
(2) Unscrew and remove the cap from the service valve.
(3) Connect the vacuum pump hose to the service valve.
(4) Operate the vacuum pump for 10-15 minutes until an absolute
vacuum of 10 mm Hg has been reached.
(5) With the vacuum pump still in operation, close the low-
pressure knob on the vacuum pump coupling. Stop the vacuum
pump.
(6) Open the 2-way valve by 1/4 turn and then close it after 10
seconds. Check all the joints for leaks using liquid soap or an
electronic leak device.
(7) Turn the body of the 2-way and 3-way valves. Disconnect the
vacuum pump hose.
(8) Replace and tighten all the caps on the valves.
Piping size (inch)
Twisting moment (N·m)
Φ1/4
15-20
Φ3/8
35-40
Φ1/2
60-65
Φ5/8
45-50
Φ3/4
70-75
(9) If the specification of outdoor unit gas valve is 3/8",but
curstomer needs to install 1/2" indoor unit so that it is need to use
a “pipe joint subassembly” (Code 06643008) to make a conversion
joint with outdoor unit gas valve and connection pipe, as show in
following.
conversion joint
Install the drain fitting and the drain hose(for model with heat
pump only)
Condensation is produced and flows from the outdoor unit when
the appliance is operating in the heating mode. In order not to
disturb neighbours and to respect the environment, install a drain
fitting and a drain hose to channel the condensate water. Install
the drain fitting and rubber washer on the outdoor unit chassis and
connect a drain hose to it as shown in the figure.
