28
Installation and Maintenance
Service Manual
Location
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 R410A.
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.
Hex nut diameter(inch) Tightening torque(ft·Ibf)
Φ1/4
11.10~4.75
Φ3/8
20.12~29.50
Φ1/2
33.19~40.56
Φ5/8
44.24~47.94
Φ3/4
51.32~55.31
TM18H4O need to be installed the indoor unit
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.
Vacuum pump
INDOOR
UNIT
Vacuum pump
Vacuum pump
Connect to the
indoor unit
Refrigerant fluid direction of flow
3-way valve
2-way valve
Service
inlet
(2) Turn
(8) Secure
(7) Turn to open fully
(2) Turn
(8) Secure
Valve cap
(6) Open by 1/4 turn
(7) Turn to open fully
(2) Turn
(8) Secure
Valve cap
Drain-water hole
Bottom frame
Drain plug
Hose (available commercially,
inner dia. 16mm)
Drain connecter
8.2 Installing the Outdoor Unit
