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REFRIGERANT PIPING
Piping with outdoor unit
• Shape of valve differs according to the outdoor unit.
For details of installation, refer to the Installation Manual of the outdoor unit.
Air purge
Using a vacuum pump, perform vacuuming from the charge port of valve of the outdoor unit.
For details, follow to the Installation Manual attached to the outdoor unit.
• Never use the refrigerant sealed in the outdoor unit for air purge.
For the tools such as charge hose, etc., use those manufactured exclusively for R410A.
Refrigerant amount to be added
For addition of the refrigerant, add refrigerant "R410A" referring to the attached Installation Manual of outdoor unit.
Be sure to use a scale to charge the refrigerant of specified amount.
• Charging an excessive or too little amount of refrigerant causes a trouble of the compressor.
Be sure to charge the refrigerant of specified amount.
• A personnel who charged the refrigerant should write down the pipe length and the added refrigerant amount
in the nameplate attached to the service panel of the outdoor unit. It is necessary to troubleshoot the
compressor and refrigeration cycle malfunction.
Open the valve fully
Open the valve of the outdoor unit fully. A 4 mm hexagonal wrench is required for opening the valve.
For details, refer to the Installation Manual attached to the outdoor unit.
Gas leak check
Check with a leak detector or soap water whether gas leaks or not, from the pipe connecting section or cap of the
valve.
Use a leak detector manufactured exclusively for HFC refrigerant (R410A, R134a, etc.).
Thermal insulation process
Apply thermal insulation for the pipes separately at liquid side and gas side.
For the thermal insulation to the pipes at gas side, be sure to use the material with heat-resisting temperature
120°C or higher.
Using the attached thermal insulation material, apply the thermal insulation to the pipe connecting section of the
indoor unit securely without gap.
Apply the thermal insulation to the pipe connecting section of the indoor unit securely up to the root without
exposure of the pipe. (The pipe exposed to the outside causes water leak.)
REQUIREMENT
REQUIREMENT
REQUIREMENT
REQUIREMENT
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