Hokkaido HKEI-HCNI 263 G, Руководство по обслуживанию

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Service manual
7.4 Air purging of the piping and indoor unit
Required tools:
Hexagonal wrench; adjustable wrench; torque wrenches, wrench to hold the joints and gas leak detector.
Note:
The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration piping, it will
affect the compressor, reduce the cooling capacity, and could lead to a malfunction of unit.
Be sure, using a torque wrench to tighten the service port cap (after using the service port), so that it
prevents the gas leakage from the refrigeration cycle.
Procedure Set the 3-way valve to the opened position.
Recheck the piping connections. Mounted the valve stem nuts to the 2-way and
3-way valves.
Open the valve stem of the 2-way valve
counterclockwise approximately 90’, wait 10
seconds, and then set it to closed position.
Check for gas leakage.
At this time, especially check for gas leakage from
the 2-way and 3-way stem nuts, and from the
service port.
Be sure to use a hexagonal wrench to operate the
valve stem
Check for gas leakage.
Check the flare connection for gas leakage Caution:
Purge the air from the system. If gas leakage is discovered in step (3) above,
take the following measures.
Set the 2-way valve to the open position and
remove the cap from the 3-way valve’s service
port.
If the leaks stop when the piping connections are
tightened further, continue working from step (4).
Using the hexagonal wrench to press the valve
core pin, discharge for three seconds and then
wait for one minute. If the gas leaks do not stop when the connections
are retightened, repair the location of the leak,
discharge all of the gas through the service port,
and then recharge with the specified amount of
gas from a gas cylinder.
Use torque wrench to tighten the service port cap
to a torque of 1.8 kg.m. (18n.m)
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