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supplied piping
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Appropriate tightening torque:
Outside
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copper pipe
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Cap
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wrench
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Caution:
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Opening the valve before charging the refrigerant may cause damage
to the unit.
Do not use a leak detection additive.
10.3. Airtight test, evacuation, and
refrigerant charging
1
Airtight test
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[Fig. 10.3.1] (P.12)
A
Nitrogen gas
B
To indoor unit
C
System analyzer
D
Low knob
E
High knob
F
Valve
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I
Heat source unit
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Service port
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Also, with
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airtightness test cautiously.
Caution:
Only use R410A refrigerant.
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2
Evacuation
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,
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(If the
degree of vacuum increase is larger than 130 Pa [0.01886 psi/1.0 Torr],
water might present. Apply pressure to dry nitrogen gas up to 0.05
MPa [7.25 psi] and vacuum again. Repeat the evacuation process three
or more times until the vacuum pressure is lost by 130 Pa or below.)
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[Fig. 10.3.2] (P.12)
A
System analyzer
B
Low knob
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High knob
D
Valve (heat source
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E
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pipe
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pipe
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Valve
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Scale
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Vacuum pump
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To indoor unit
O
Heat source unit
Note:
Always add the appropriate amount of refrigerant. Also always charge
the system with liquid refrigerant.
Use a gauge manifold, charging hose, and other parts for the
refrigerant indicated on the unit.
Use a graviometer. (One that can measure down to 0.1 kg [302 oz].)
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(Recommended vacuum gauge: ROBINAIR 14830A Thermistor Vacuum
Gauge or Micron Gauge)
Do not use a manifold gauge to measure vacuum pressure.
Also use a vacuum gauge that reaches 65 Pa [abs] [0.00943 psi/0.5
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<Triple Evacuation>
Evacuate the system to 4,000 microns from both service valves.
System manifold gauges must not be used to measure vacuum.
A micron gauge must be used at all times.
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PSIG.
Evacuate the system to 1,500 microns from the suction service valve.
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PSIG.
Evacuate the system to 500 microns. System must hold the vacuum at
500 microns for a minimum of 1 hour.
Conduct a rise test for a minimum of 30 minutes.
3
Refrigerant Charging
Do not use refrigerant other than the type indicated in the manuals
provided with the unit and on the nameplate.
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Airtight test procedure
Restriction
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