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9. Leak Test and Air Evacuation
Serene Wall Hung Split System
1.
Run interconnecting pipe work from condenser to
evaporator.
2.
Connect the liquid and suction pipe to the indoor and
outdoor unit flare connections (please see refrigerant piping
connection instruction).
3.
Fit service gauge to the service port on the outdoor unit.
4.
Fit a nitrogen to the service gauge.
5.
Pressurise the system to 4000kPa. A recommended
pressure test is to be performed for no less than 1 hour at
4000kPa Bubble test system and ensure pressure does not
drop during this time.
To indoor unit
N
I
T
R
o
G
E
N
refrigerant pipes
4000 kPa leak test
for 1 hour
Leak Test
Fig. 9.1
CAUTION
• Use a vacuum pump and a vac stat reading lower than 500 microns and an air discharge capacity above 40L/min.
• The outdoor unit does not need vacuuming
DO NOT
open the outdoor unit’s gas and liquid stop valves.
• Ensure that your vac stat reads 500 micron or below after 2 hours. If after three hours of operation and the vac stat
reading is still above 500 microns, check re-pressurise system and check for gas leak. If there is no leakage, perform
another evacuation for 1 to 2 hours or until the vac stat reads 500 microns or below.
•
DO NOT
use refrigerant gas during a leak test of a system.
Evacuation Instructions