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Daikin RXYQ5PY1 Service Manual: Air Tight Test And Vacuum Drying

Daikin r-410a heat pump 50hz/60hz cooling only 50hz.
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Heat Pump / Cooling Only 50Hz (RX(Y)Q5~54P)
1.8

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
1.8.1 Preparations
<Needed tools>
Gauge manifold
Charge hose valve
Vacuum pump
<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.)
Note:
! 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.
246
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.
outdoor unit.
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".
below.
Gauge manifold
Measuri n g
Nitrogen
devi c e ::
R-410A tank
(with siphon)
State of valve A, B and C and
shutoff valves
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.
Liquid side
shutoff valve
Gas side
shutoff valve
Outdoor
Charge
Shutoff valve
hose
service port
Valve B
Valve C
Vacuum
Valve A
pump
figure 28
Valve
A
B
Close
Open
SiEN34-705
Refrigerant charge port
Outdoor
unit
unit
To indoor unit
:
Interunit pipings
:
Refrigerant flow
shutoff valve
C
Liquid side
Gas side
Open
Close
Close
[R-410A] Label
Installation Manual

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