Daikin VRV III REYQ8PY1B, Service Manual

Page: 169 / 472

Test Operation SiBE37-701
158 Test Operation
1.2.3 Air Tight Test and Vacuum Drying
Note:
„
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.)
<Needed tools>
<The system for air tight test and vacuum drying>
•
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”.
REYQ8~16PY1B
REYQ18~48P7Y1B
Note:
„
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.
Gauge manifold
Charge hose valve
• 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.
Vacuum pump
• 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.
: Field piping
: Gas flow
Valve A
Valve C
Valve B
Outdoor unit
To BS
(or indoor) unit
: Shutoff valve
( : Service port )
Refrigerant charge port
HP/LP gas pipe shutoff valve
Suction gas pipe shutoff valve
Liquid pipe shutoff valve
Vacuum pump
Charge hose
R410A tank (with siphon)
Nitrogen
Gauge manifold
Measuring
device
: Shutoff valve
: Field piping
: Gas flow
Nitrogen
Measur
ing
de
vice
Gauge manifold
R-410A tank
(with siphon)
Charge hose
Equalizer pipe shutoff valve
HP/LP gas pipe shutoff valve
Liquid pipe shutoff
valve
Refrigerant charge port
Suction gas pipe shutoff valve
Vacuum pump
Valve A
Valve B
Valve C
Outdoor
unit
Outdoor
unit
Outdoor
unit
To BS
(or indoor) unit
( : Service port )
[R-410A] Label