Repair Section
60
(4) Checking vacuum
1)
Leave the high pressure valve of the gauge
manifold closed for at least 60 minutes.
2)
If the gauge pointer indicates a rise of more than
13 Pa, there may be a leak or moisture
somewhere in the system (this could also include
gauge manifold). If necessary, repair the system
and repeat "(1) Preparation" to "(4) Evacuation".
9.4 Refrigerant Charging Work
(1) Refrigerant charging
1)
Remove the hose from the vacuum pump, and
connect it to the refrigerant cylinder (R-410A).
2)
Securely place the refrigerant cylinder on a scale
with a weighing capacity of 30 kg that is
graduated by 5 g.
3)
Open the high pressure valve of the gauge manifold
and the valve of the refrigerant cylinder. Charge the
system with refrigerant to the specified amount.
Standard Amount of Refrigerant: 0.75 ± 0.02 kg
CAUTION
The amount of refrigerant charged has a great
effect on the cooling capacity of the unit.
Charge to the specified amount, always
observing the scale graduations while charging.
4)
Close the high pressure valve of the gauge
manifold and the valve of the refrigerant cylinder.
ILL00758-00
Return
Pipe Brazing
LO
Closed
HI
Closed
Valve Setting
Pressure Gauge
ILL00759-00
Open The Valve
of Refrigerant
Cylinder
To Process Tube Fitting
Inlet Hose
Refrigerant
Cylinder R-410A
Outlet Hose
LO
Closed
HI
Closed
Valve Setting
Air Purging
I001903
LO
Closed
HI
Open
LO
Closed
HI
Closed
Refrigerant
Cylinder R-410A
Valve Setting
Specified Amount
of Refrigerant
High Pressure Valve
High Pressure
Side Tube
Process Tube Fitting
Valve of
Refrigerant
Cylinder
Weight
