9
Airtight test/Air purge, etc.
For airtight test, air purge, addition of refrigerant, and gas leak check, follow the Installation Manual attached to the
outdoor unit.
REQUIREMENT
Be sure to use the tool such as charge hose exclusive to R410A.
Do not turn on the power until the airtight test and the vacuuming have finished.
(If turning on the power, the incorporated PMV is closed fully and the period until the vacuuming finishes
elongates.)
Open fully valves of 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.
REQUIREMENT
Use a leak detector manufactured exclusively for HFC refrigerant (R410A, R134a, etc.).
Heat insulating process
Perform heat insulating for pipes at liquid side and gas
side separately.
In cooling time, temperature at both liquid and gas
sides becomes lower.
Therefore, perform heat insulating process sufficiently
to avoid dewing.
• For heat insulator of pipe at gas side, be sure to use
one with heat-resisting temp. 120°C or more.
• Using the attached heat insulating pipe, perform heat
insulating process securely for pipe connecting part
of the PMV Kit without clearance.
REQUIREMENT
Apply the heat insulation to the pipe connecting section of the PMV Kit securely up to the root without exposure
of the pipe. (The pipe exposed to the outside causes water leak.)
5
REFRIGERANT PIPING
PMV Kit
Union
Flare nut
Heat insulating pipe
(Attached)
Binding band
(Attached)
Heat insulator
