8
-4-3.
Install (first by hand-tightening, then securely with
a wrench) flare nuts and bonnets at all service
valves in the refrigeration circuit where evacuation
will take place. This process is highly important
to completely evacuate the system.
8
-4-4.
Check that the blue/green connector is properly
attached. (Figs.9-2 and 9-3)
8
-4-5.
Turn the disconnect switch ON (if it has been
OFF) to open the two solenoid valves (SVA and
SVB). (Figs.9-2 and 9-3)
8
-4-6.
With both the " Lo " and " Hi " knobs of the
manifold valve open, run the vacuum pump. The
operation time varies with the capacity of the
pump. (Run the pump at least 30 minutes.)
Evacuation is successful if the vacuum gauge
reading remains – 75 cmHg or more for at least 10
seconds after closing both the " Lo " and " Hi "
knobs of the manifold valve.
8
-4-7.
With the vacuum pump still running, turn both the
narrow and wide service valves all the way in to
close the valves (position -a-).
Then stop the pump.
8
-4-8.
After removing the vacuum hoses from the service
valves, replace the flare nuts and bonnets on the
valves. The refrigerant circuit is now ready for
charging.
8
-5. Refrigerant charging
8
-5-1.
After evacuation is completed, charge the circuit
with the proper amount of refrigerant.
The proper amount of refrigerant is specified on
the nameplate of the outdoor unit and in Section
"2-1. Unit Specifications" in the service manual.
8
-5-2.
Use a hose to connect the narrow tube service
valve to the liquid port of the charging cylinder.
(Figs.9-4 and 9-5)
8
-5-3.
Purge air from the hose. Do this by opening the
charging cylinder valve, then slightly loosening the
connection to the narrow tube service valve. Wait
a few moments, then retighten the connection.
NOTE
35
Power
Supply
Disconnect switch
(Field supply)
Charging cylinder
Open
Unit B
Unit C
Unit A
Hex wrench
1
2
3
4
5
6
7
8
9
10 11 12
Terminal plate
GRN
BLU
GRV227M3C5
Fig.9-4
1
2
3
4
5
6
7
8
Terminal plate
GRN
BLU
COND
SVC
SVA
SVB
CAPI
CAPI
CAPI
LI
CAPI
CM2
Power
Supply
Disconnect switch
(Field supply)
Lo
Hi
Vacuum pump
Manifold
valve
Unit A
Unit B
Unit C
Vaccum gauge
GRV340M3C5
Fig.9-3
