Daikin VRV III REYQ8PY1 Service Manual page 163

Test Operation
1.2.3 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>
•
REYQ8~16PY1
REYQ18~48PY1
Note:
152
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.)
• 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.
Referring to next figure, connect an nitrogen tank, refrigerant tank, and a vacuum pump to the
outdoor unit.
The refrigerant tank and the charge hose connection to refrigerant charge port or the valve A
in next figure are needed in "1.2.5 Additional Refrigerant Charge and Check Operation".
Gauge manifold
Measuring
device
R410A tank (with siphon)
Gauge manifold
R-410A tank Vacuum pump
(with siphon)
The airtightness test and vacuum drying should be done using the service
ports of equalizer pipe, HP/LP gas pipe, suction gas pipe and liquid pipe
shutoff valve.
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)
See [Shutoff valve operation procedure] in "1.2.5.1 Before Working"
for details on handling the shutoff valve.
The refrigerant charge port is connected to unit pipe.
When shipped, the unit contains the refrigerant, so use caution when attaching the charge
hose.
Refrigerant charge port
HP/LP gas pipe shutoff valve
Suction gas pipe shutoff valve
Liquid pipe shutoff valve
Charge hose
Valve C
Vacuum pump
Valve A
: Field piping
: Gas flow
Equalizer pipe shutoff valve
HP/LP gas pipe shutoff valve
Suction gas pipe shutoff valve
Liquid pipe shutoff
Charge hose
valve
Refrigerant charge port
Valve A
Valve B
Valve C
: Field piping
: Gas flow
Outdoor unit
Valve B
: Shutoff valve
To BS
( : Service port )
(or indoor) unit
Outdoor Outdoor Outdoor
unit unit unit
: Shutoff valve
To BS
( : Service port )
(or indoor) unit
[R-410A] Label
Test Operation
Si37-701