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5-9 GAS CHARGE
Perform gas charge to unit.
1Connect gas cylinder to the service port of stop valve.
2Perform air purge of the pipe (or hose) coming from refrigerant gas cylinder.
3Replenish specified amount of the refrigerant, while operating the air conditioner for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified for the refrigerating cycle.
CAUTION:
When charging the refrigerant system with additional refrigerant, be sure to use liquid refrigerant. Add-
ing gas refrigerant may change the composition of the refrigerant in the system and affect normal
operation of the air conditioner. Also, charge the system slowly, otherwise the compressor will be
locked.
To maintain the high pressure of the gas cylinder, warm the gas cylinder with warm water (under 40°C) during
cold season. But never use naked fire or steam.
Indoor
unit
Union
Stop valve
Outdoor
unit
Union
Gauge manifold
valve (for R410A)
Charge hose (for R410A)
Refrigerant gas
cylinder
operating valve
(for R410A)
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Electronic scale for
refrigerant charging
Liquid pipe
Gas pipe
Union
Stop valve with
service port
Union
5-10 TEST RUN
• Be sure to perform the test run for each unit. Make sure each indoor unit operates properly following the
installation manual attached to the unit.
• If you perform the test run for all indoor units at once, you cannot detect any erroneous connection, if any, of
the refrigerant pipes and the indoor/outdoor unit connecting wires.
About the restart protective mechanism
Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3
minutes to protect the air conditioner.
5-11 EXPLANATION TO THE CUSTOMER
• Recommend the customer to read the OPERATING INSTRUCTIONS carefully.
• Using the OPERATING INSTRUCTIONS for each unit, explain the following to the customer, how to control
temperature, how to remove the air filters, how to remove or put the remote controller in the remote controller
holder, how to clean, precautions for operation, etc.
If the customer (user) is absent, explain to the purchaser (owner, building’s controller, etc) about those
points.