Toyotomi Kuro MTN A228DV Service Manual page 15

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
1. Recheck the piping connections.
2. Open the valve stem of the 2-way valve
counterclockwise approximately 90', wait 10
seconds, and then set it to closed position.
Be sure to use a hexagonal wrench to
operate the valve stem.
3. Check for gas leakage.
Check the flare connection for gas leakage
4. Purge the air from the system.
Set the 2-way valve to the open position
and remove the cap from the 3-way valve's service
port.
Using the hexagonal wrench to press the
valve core pin, discharge for three seconds and
then wait for one minute.
5. Use torque wrench to tighten the service port cap
to a torque of 1.8 kgf.m. (18n.m)
6. Set the 3-way valve to the opened position.
7. Mounted the valve stem nuts to the 2-way and
3-way valves.
8. 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.
Caution:
If gas leakage is discovered in step (3) above,
take the following measures.
If the leaks stop when the piping connections
are tightened further, continue working from step (4).
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.
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