Mitsubishi Electric PUMY-P-NKMU, Installation Manual

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Remove the service panel
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(three screws) and the front piping cover
A
(two screws)
and rear piping cover
B
(two screws).
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unit’s stop valve is completely closed.
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Vacuum-purge air from the indoor unit and the connection piping.
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Evacuate with the valve of the outdoor unit closed and evacuate both the connection
piping and the indoor unit from the service port provided on the valve of the outdoor
unit using a vacuum pump. (Always evacuate from the service port of both liquid pipe
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evacuation for at least one hour or more. Then, stop the vacuum pump and leave it for
1 hour. Ensure the degree of vacuum has not increased.
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Finally, seal in with the liquid refrigerant through the liquid pipe, and adjust the gas
piping to obtain an appropriate amount of the refrigerant during operation.
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After connecting the refrigerant pipes, check the connected pipes and the indoor
unit for gas leaks. (Refer to 4.4 Refrigerant pipe airtight testing method)
4
Vacuumize the refrigerant lines through the service port of the liquid and gas stop
valves. And then open the stop valves completely (for both the liquid and gas stop
valves). This will completely connect the refrigerant lines of the indoor and outdoor
units.
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control valves will be damaged.
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tion sections of the outdoor unit.
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lines.
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Failure to replace and tighten the caps may result in refrigerant leakage. In
addition, do not damage the insides of the valve caps as they act as a seal to
prevent refrigerant leakage.
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sections to prevent water from entering the thermal insulation.
Note:
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manifold gauges must not be used to measure vacuum. A micron gauge must
be used at all times.
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microns for a minimum of 1 hour.
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(1) Connect the testing tools.
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A B
are closed and do not open them.
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of the liquid
stop valve
A
and the gas stop valve
B
.
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pressure does not decrease.
2
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sure does not decrease.
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and refrigerant pressure.
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have passed the test and there are no leaks.
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(4) If the pressure decreases in steps (2) or (3), there is a gas leak. Look for the source
of the gas leak.
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(1) Gas side (Fig. 4-6)
Type A
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screwdriver to complete open.
2
Check that the valves are fully open, then return the cap to its original state and
tighten it down.
Type B
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wise direction to open.
2
Make sure that the stop valve is open completely, push in the handle and rotate
the cap back to its original position.
(2) Liquid side (Fig. 4-7)
1
Remove the cap and turn the valve rod counterclockwise as far as it will go with
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stopper.
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10 revolutions)
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Make sure that the stop valve is open completely, push in the handle and rotate
the cap back to its original position.
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Valve
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Handle
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Cap
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Local pipe side
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Front piping cover
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Piping cover
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Stop valve
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Service panel
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Bend radius : 100 mm - 150 mm
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Service port
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Local pipe
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Sealed, same way for gas side
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Pipe cover
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Do not use a wrench here.
Refrigerant leakage may result.
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(2)
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Open position side
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Service port
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Wrench hole
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Operation section