Airtight Test, Evacuation, And Refrigerant Charging; Airtight Test - Mitsubishi Electric CITY MULTI PQHY-P-ZLMU Manual De Instalación

supplied piping
Pipe diameter
Appropriate tightening torque:
Outside
Cap
copper pipe
Caution:
Opening the valve before charging the refrigerant may cause damage
to the unit.
Do not use a leak detection additive.
Airtight test procedure
good.
Caution:
Only use R410A refrigerant.
2 Evacuation
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.)
[Fig. 10.3.2] (P.12)
A System analyzer B Low knob
D Valve (heat source E
pipe
G Service port H
J Valve K
M Vacuum pump N To indoor unit
10.3. Airtight test, evacuation, and
Minimum insertion depth

1 Airtight test

airtightness test cautiously.
Service port
wrench
Note:
,
<Triple Evacuation>
(If the
C High knob
3 Refrigerant Charging
F
pipe
I Valve
L Scale
O Heat source unit
refrigerant charging
[Fig. 10.3.1] (P.12)
A Nitrogen gas B To indoor unit
D Low knob E High knob
G H
J Service port
Restriction
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].)
(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
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.
PSIG.
Evacuate the system to 1,500 microns from the suction service valve.
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.
Do not use refrigerant other than the type indicated in the manuals
provided with the unit and on the nameplate.
C System analyzer
F Valve
I Heat source unit
Also, with
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