Daikin RXYQ96PYDN Service Manual page 91

Test Operation
10.2.3 Air Tight Test and Vacuum Drying
Note:
<Needed tools>
Gauge manifold
Charge hose
valve
Vacuum pump
<The system for air tight test and vacuum drying>
Gauge manifold
76
After finishing piping work, carry out airtight 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
has been completed. Measuring after the shutoff valve is opened will cause the insulation value
to drop.
Referring to figure 25, connect a nitrogen tank, refrigerant tank, and a vacuum pump to the
outside unit.
The refrigerant tank and the charge hose connection to refrigerant charge port or valve A in
figure 25 are needed in 10.2.5 Additional Refrigerant Charge and Check Operation.
Gauge manifold
R-410A tank (with siphon)
Vacuum pump
R-410A tank (with siphon) Vacuum pump
To prevent entry of any impurities and insure sufficient pressure
resistance, always use the special tools dedicated for R-410A.
Use charge hose that has a 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 –14.6 psi.
Take care the pump oil never flows backward into the refrigerant pipe
when the pump stops.
High side equalizer pipe shutoff valve
Gas pipe shutoff valve
Low side equalizer pipe shutoff valve
Charge hose
Liquid pipe shutoff valve
Refrigerant charge port
Valve C
: Field piping
: Gas flow
Refrigerant charge port
Gas pipe shutoff valve
Liquid pipe shutoff valve
Charge hose
Valve A
: Field piping
: Gas flow
< RXYQ144PTJU Only >
fig. 25
Outside unit Outside unit
Valve A
Valve B
Indoor unit
Outside unit
Valve B
Valve C
Indoor unit
VRVIII R-410A Heat Pump 60Hz
SiUS34-801A_b
Shutoff valve
( Service port)
: Shutoff valve
( )
: Service port