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30 | Air Evacuation
3.
Open the Low Pressure side of the manifold gauge. Keep
the High Pressure side closed.
4.
Turn on the vacuum pump to evacuate the system.
5.
Run the vacuum for at least 15 minutes, or until the
Compound Meter reads -76cmHG (-10
6.
Close the Low Pressure side of the manifold gauge, and
turn off the vacuum pump.
7.
Wait for 5 minutes, then check that there has been no
change in system pressure. Disconnect Vacuum Machine
before opening service valves.
8.
If there is a change in system pressure, refer to Gas Leak
Check section for information on how to check for leaks.
If there is no change in system pressure, unscrew the cap
from the packed valve (high pressure valve).
9.
Insert hexagonal wrench into the packed valve (high
pressure valve) and open the valve by turning the wrench
in a 1/4 counterclockwise turn. Listen for gas to exit the
system, then close the valve after 5 seconds.
10. Watch the Pressure Gauge for one minute to make sure
that there is no change in pressure. The Pressure Gauge
should read slightly higher than atmospheric pressure.
Note on Adding Refrigerant
Some systems require additional charging depending on pipe lengths. The standard pipe length varies according to local
regulations. The additional refrigerant to be charged can be calculated using the following formula:
Connective Pipe Length (m)
Air Purging Method
< Standard pipe length
> Standard pipe length
CAUTION
DO NOT mix refrigerant types.
6 720 869 159 (2016/12)
Pa or 1.5 Torr).
5
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Vacuum Pump
Liquid Side: Ø 6.35 (ø 0.25")
Vacuum Pump
(Pipe length - standard length) x 15g/m (Pipe length -
standard length) x 0.16oZ/ft
11.
Remove the charge hose from the service port.
12. Using hexagonal wrench, fully open both the high pressure
and low pressure valves.
13. Tighten valve caps on all three valves (service port, high
pressure, low pressure) by hand. You may tighten it further
using a torque wrench if needed.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal wrench until it
hits against the stopper. Do not try to force the valve to open
further.
Inverter R410A:
Fig. 7.2
Additional Refrigerant
N/A
Liquid Side: Ø 9.52 (ø 0.375")
Inverter R410A:
(Pipe length - standard length) x 30g/m (Pipe length - standard
length) x 0.32oZ/ft
Installation Manual
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