Installation Manual

3.3 Installation of the throttle (for some models)
Precautions
- To ensure throttle efficiency, mount the throttle as
horizontally as possible.
- Wrap the supplied anti-shock rubber on the outside of the
throttle to limit noise.
1 Anti-shock rubber
2 Throttle
Indoor
Indoor
Indoor
Outdoor
Outdoor
Outdoor
√
×
×
3.4 Purging air and checking gas leakage
When piping work is completed, purge the air and check for
gas leakage.
WARNING
Do not mix any substance other than the specified refrigerant
into the refrigeration cycle.
When refrigerant gas leaks, ventilate the room as soon as
possible.
The specified refrigerant should always be recovered and
should never be released directly into the environment.
Use a vacuum pump for the specified refrigerant. Using the
same vacuum pump for different refrigerants may damage
the vacuum pump or the unit.
If using additional refrigerant, perform air purging from the
refrigerant pipes and the indoor unit using a vacuum pump, then
charge the additional refrigerant.
Use a hexagonal wrench (4 mm/0.2 in) to operate the stop
valve rod.
All refrigerant pipe joints should be tightened with a torque
wrench at the specified tightening torque.
1) Connect the projection side of the charging hose (which comes from
the gauge manifold) to the gas stop valve's service port.
2)
3)
4)
Fully open the gauge manifold's low-pressure valve (Lo) and
completely close its high-pressure valve (Hi).
(The high-pressure valve requires no operation.)
Perform vacuum pumping and make sure that the compound
pressure gauge reads -0.1 MPa (-76 cmHg).*1
Close the gauge manifold's low-pressure valve (Lo) and stop
the vacuum pump.
(Maintain this state for a few minutes to make sure the
compound pressure gauge pointer does not swing back.)*2
5) Remove the caps from the liquid and gas stop valves.
6) Turn the liquid stop valve's rod 90 degrees counterclockwise
with a hexagonal wrench to open the valve. Close it after 5
seconds and check for gas leakage. Using soapy water,
check for gas leakage from the indoor unit's flare and the
outdoor unit's flare and valve rods. After the check is
complete, wipe off all soapy water.
7) Disconnect the charging hose from the gas stop valve's
service port, then fully open the liquid and gas stop
valves. (Do not attempt to turn the valve rod beyond its
stop.)
8) Tighten the valve and service port caps for the liquid and gas
stop valves with a torque wrench at the specified torques.
*1. Pipe length vs. Vacuum pump run time
10
1 Throttle
2 Liquid pipe
3 Gas pipe
≥
500mm/19.7in
1
2
3