AirStage AO54FJ, Руководство по обслуживанию

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07-09
4. Tightness test
(1) After completing all piping connection, always carry out an air tight test to check and confirm that there is no gas leakage.
Charge the piping with nitrogen to within the sealing test pressure (4.15 MPa). After 24 hours, check that the pressure has
not fallen. Make sure to add the pressure to both gas pipe and liquid pipe. Perform the leak test on all flared and brazed parts.
Note: When the ambient temperature changes 5 deg. , the test pressure changes 0.07MPa.
(2) After tightness test, please insulate the connecting portion, apply the enough insulation to avoid any gap.
5. Vacuum process
(1) Do not purge the air with refrigerant but use a vacuum pump to remove air from the indoor units and connection pipes!
(2) Remove the cap, and connect the gauge manifold and the vacuum pump to the charging valve by the service hoses.
(3) Vacuum the indoor unit and the connecting pipes until the pressure gauge indicates -76 cmHg.
(4) When -76 cmHg is reached, operate the vacuum pump for at least 1 hour.
(5) If necessary, add the refrigerant for the appropriate amount after the vacuum process is completed
(Refer to next page "ADDITIONAL CHARGE").
6. Additional charge
(1) Be careful, don't charge with wrong refrigerant!
(2) When moving and installing the air conditioner, do not mix gas other than the specified refrigerant inside the refrigerant
circuit.
(3) When charging the refrigerant, always use an electronic balance for refrigerant charging. (to measure the refrigerant by weight)
(4) A lways charge from the liquid phase side whose composition is stable.
(5) Always add the refrigerant for the appropriate amount. (For the calculation method, please refer to 7-1"ADDITIONAL
CHARGE")
(6) Either larger or smaller refrigerant charge amount leads to the cause of trouble.
(7) For after service purpose, the added refrigerant charge amount and the calculation shall be indicated firmly on the service
label over the side panel.
(6) Disconnect the service hoses and fit the cap to the charging valve.
(7) Remove the blank caps, and fully open the spindles of the 3-way valves with a hexagon wrench.
(8) Tighten the blank caps of the 3-way valves to the specified torque.
Liquid pipe (3-way valve)
Gas pipe (3-way valve)
Blank cap
19.6 to 24.5 N·m
34.3 to 39.4 N·m
Charging cap
10 to 12 N·m
10 to 12 N·m
Gauge manifold
Vacuum
pump
Auxiliary pipe assembly
Charging
cap
Blank
cap
Hexagon
wrench
Operation
mode
Cooling
Heating
Check valve
pressure
High Pressure
Low Pressure
Check valve