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Close the Low Pressure side of the manifold
6.
gauge, and turn off the vacuum pump.
Wait for 5 minutes, then check that there
7.
has been no change in system pressure.
If there is a change in system pressure, refer
8.
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).
Insert hexagonal wrench into the packed valve
9.
(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
10.
to make sure that there is no change in
pressure. The Pressure Gauge should read
slightly higher than atmospheric pressure.
Remove the charge hose from the service port.
11.
Note on Adding Refrigerant
Some systems require additional charging depending on pipe lengths. The standard pipe length varies
according to local regulations. For example, in North America, the standard pipe length is 7.5m (25').
In other areas, the standard pipe length is 5m (16'). The refrigerant should be charged from the
service port on the outdoor unit's low pressure valve. The additional refrigerant to be charged can be
calculated using the following formula:
Connective Pipe
Air Purging
Length (m)
Method
< Standard pipe length Vacuum Pump
> Standard pipe
Vacuum Pump
length
For R290 refrigerant unit, the total amount of refrigerant to be charged is no more than:
387g(<=9000Btu/h), 447g(>9000Btu/h and <=12000Btu/h), 547g(>12000Btu/h and <=18000Btu/h),
632g(>18000Btu/h and <=24000Btu/h).
CAUTION
DO NOT
Page 30
ADDITIONAL REFRIGERANT PER PIPE LENGTH
R410A:
(Pipe length – standard length) x 15g/m
(Pipe length – standard length) x 0.16oZ/ft
mix refrigerant types.
Flare nut
alve body
V
alve stem
V
Using hexagonal wrench, fully open both the
12.
high pressure and low pressure valves.
Tighten valve caps on all three valves (service
13.
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.
Additional Refrigerant
N/A
(Pipe length – standard length) x 30g/m
(Pipe length – standard length) x 0.32oZ/ft
Cap
Fig. 6.2
R410A:
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