installing the unit
PERFORMING THE REFRIGERANT GAS LEAK TEST
• Use tools for R410A to prevent the inflow of foreign substances and resist against the internal pressure.
• Do not remove the core of filling port.
• Use dry Nitrogen gas as doing an airtight test like below.
Apply pressure to the liquid side pipe,
gas side pipe and oil balancing pipe(only
for module) with Nitrogen gas of
4.1MPa(594.6psi).
If you apply pressure more than 4.1MPa(594.6psi),
the pipes may be damaged.
Apply pressure using pressure regulator.
Keep it for minimum 24 hours to check if
the pressure drops.
After applying Nitrogen gas, check the change of
pressure using pressure regulator.
If the pressure drops, check if there is gas
leak.
If the pressure is changed, apply soapy water to check
the leak. Check the pressure of the gas again.
Maintain 1.0MPa(145psi) of the
pressure before performing vacuum drying
and check further gas leak.
After checking first gas leak, maintain 1.0MPa(145psi) to
check further gas leak.
• Perform a Nitrogen gas leak test the service valve of the outdoor unit closed.
• Use both liquid side pipe and gas side pipe when charging the Nitrogen gas.
• If the pipe is filled in a short time with a highly excessive pressure of Nitrogen gas, the
pipes may be damaged. Make sure to use a regulator to prevent the high pressure
Nitrogen gas over 4.1MPa(594.6psi) into the pipe.
CAUTION
Gauge manifold
Liquid sideGas side
Nitrogen gas
Filling port
Gas side pipe
Oil balancing valve
Liquid side pipe
High pressure gas side pipe
Pressure regulator
(Mandatory)
DVM PLUS3_IM_E_31180-1.indd 40 2009-10-16 ｿﾀﾈﾄ 2:10:36
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