Page
Flare nut
Cap
Valve body
Valve stem
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.
Fig. 6.2
Air Evacuation
Open the Low Pressure side of the manifold
gauge. Keep the High Pressure side closed.
Turn on the vacuum pump to evacuate the
system.
5
Run the vacuum for at least 15 minutes, or
until
5
6
Close the Low Pressure side of the manifold
gauge, and turn off the vacuum pump.
Wait for 5 minutes, then check that there
has
been no change in system pressure.
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.
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
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Some systems require additional charging depending on pipe lengths. The standard pipe length is
5
(
5
).
The additional refrigerant to be charged can be calculated using the following formula:
Connective Pipe
Length (m)
Air Purging
Method
Additional Refrigerant
< Standard pipe length Vacuum Pump
N/A
> Standard pipe
length
Vacuum Pump
Inverter R410A:
(Pipe length – standard length) x 0.16o /ft
5
DO NOT
mix refrigerant types.
5
6 5
5
9 5
Inverter R410A:
(Pipe length – standard length) x 30g/m
!
ARNING
!