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5) Check that the flaring is properly made.
Flare s inner surface
'
must be flaw-free
3.2 Refrigerant piping
Coat the flare both inside and ouside with
Coat here with ether oil or ester oil
Align the centres of both flares and tighten the flare nuts 3 or 4
turns by hand. Then tighten them fully with the torque wrenches.
1
2
3 4
3.3 Purging air and checking gas leakage
When piping work is completed, it is necessary to 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 occur, ventilate the room as soon as
possible.
The specified refrigerant should always be recovered and 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 indoor unit using a vacuum pump, than
charge additional refrigerant.
Use a hexagonal wrench(4mm) to operate the stop valve rod.
All refrigerant pipe joints should be tightened with a torque
wrench at the specified tightening torque.
The pipe end must
be evenly flared in a
perfect circle.
Make sure that the
flare nut is fitted.
ether
oil or
ester
oil .
1
Torque wrench
2
Flare nut
3
Piping union
4
Spanner
1) Connect projection side of charging hose (which comes from
gauge manifold) to gas stop valve's service port.
2) Full open gauge manifold's low-pressure valve (Lo) and
completely close its high-pressure valve (Hi)
(High-pressure valve subsequently requires no operation.)
3) Do vacuum pumping and make sure that the compound
pressure gauge reads -0.1MPa (-76cmHg).*1
4) Close gauge manifold's low-pressure valve (Lo) and sop
vacuum pump.
(Keep this state for a few minutes to make sure that the
compound pressure gauge pointer does not swing back.)*2
5) Remove caps from liquid stop valve and gas stop valve.
6) Turn the liquid stop valve's rod 90 degrees counterclockwise
with a hexagonal wrench to open valve.
Close it after 5 seconds, and check for gas leakage.
Using soapy water, check for gas leakage from indoor unit's
flare and outdoor unit's flare and valve rods.
After the check is complete, wipe all soapy water off.
7) Disconnect charging hose from gas stop valve's service port
then fully open liquid and gas stop valves.
(Do not attempt to turn valve rod byond its stop.)
8) Tighten valve caps 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
Pipe length
Up to 15m
Run time
Not less than 10 min
*2. If the compound pressure gauge pointer swings back,
refrigerant may have water content or a loose pipe joint may
exists. Check all pipe joints and retighten nuts as needed,
then repeat steps 2) through 4).
3.4 Additional refrigerant charge
CAUTION
Refrigerant may only be charged after performing the leak
test and the vacuum pumping.
Check the type of refrigerant to be used on the machine
nameplate. Charging with an unsuitable refrigerant may
cause explosions and accidents, so always ensure that the
appropriate refrigerant is charged.
Refrigerant containers shall be opened slowly.
The outdoor unit is factory charged with refrigerant. Calculate the
added refrigerant according to the diameter and the length of the
liquid pipe of the outdoor unit/indoor unit connection.
Pipe length and refrigerant amount:
Connective
Air purging
Additional amount of refrigerant to be charged
pipe length
method
Use vacuum
Less
pump.
than 5m
Liquid side:
More
Use vacuum
than 5m
pump.
R32: (L-5)x12g/m
Be sure to add the proper amount of additional refrigerant.
Failure to do so may result in reduced performance.
51
More than 15m
Not less than 15min
Liquid side:
6.35mm (1/4")
9.52mm (3/8")
R32: (L-5)x24g/m
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