Heat Pump / Cooling Only 50Hz (RX(Y)Q5~54P)
Air Tight Test and Vacuum Drying
! Always use nitrogen gas for the airtightness test.
! Absolutely do not open the shutoff valve until the main power circuit insulation measurement
Charge hose valve
<The system for air tight test and vacuum drying>
! Referring to figure 28, connect an nitrogen tank, refrigerant tank, and a vacuum pump to the
! The shutoff valve and valve A~C in figure 28 should be open or closed as shown in the table
Air tight test, Vacuum drying
(Close valve A and shutoff valves
certainly. Otherwise the refrigerant
in the unit are released.)
! The airtightness test and vacuum drying should be done using the liquid
! See [Shutoff valve operation procedure] in "1-11-1 Before working" for
! The refrigerant charge port is connected to unit pipe.
has been completed. (measuring after the shutoff valve is opened will cause the insulation
value to drop.)
! To prevent entry of any impurities and insure sufficient pressure resistance,
always use the special tools dedicated for R-410A.
! Use charge hose that have pushing stick for connecting to service port of
shutoff valves or refrigerant charge port.
! The vacuum pump for vacuum drying should be able to lower the pressure
to –100.7kPa (5 Torr –755mm Hg).
! Take care the pump oil never flow backward into the refrigerant pipe during
the pump stops.
The refrigerant tank and the charge hose connection to refrigerant charge port or the valve
A, C in figure 28 are needed in "1-11. Additional Refrigerant Charge and Check Operation".
Measuri n g
devi c e ::
State of valve A, B and C and
side and gas side shutoff valve service ports.
See the [R-410A] Label attached to the front plate of the outdoor unit for
details on the location of the service port (see figure at right).
details on handling the shutoff valve.
When shipped, the unit contains the refrigerant, so use caution when
attaching the charge hose.
Refrigerant charge port
To indoor unit