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H P 9 0 0 / 1 2 0 0 S P L I T P R E M I U M
I n s t a l l a t i o n a n d u s e r m a n u a l
P a g e
2 1
/ 3 6 V e r s i o n : 0 1 / 2 0 1 7
HEAT P
U
MP
MI
C
R
O
W
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L
L HP
Pressure test / Air purging
Sometimes bits of air and moisture remains in the refrigerant circuit. If this is not treated, following
symptoms may appear on your heat pump:
1.
Pressure in the system rises.
2.
Operating current rises.
3.
Heating or cooling efficiency drops.
4.
Blockage of capillary tube due to frozen moisture resulting in complete failure of the heat
pump.
5.
Corrosion of refrigerant circuit.
It is thus highly advised to take a leak test after evacuating the complete system. Leak test can be
performed with usual methods using manifold valve and/or soap water. Air purging can be performed
by most commonly applied methods with vacuum pump. This Installation and user manual elaborates
vacuum pump method.
When the condensing unit is pre-charged with refrigerant we do not
recommend a pressure test using nitrogen.
Air purging with vacuum pump
1.
Preparation
a.
Check that each tube (both liquid and gas) between the water and condensing units
have been properly connected and all wiring for the test run has been completed.
b.
Remove the service valve caps from both the gas and the liquid side on the
condensing unit. Please note that both the liquid and the gas side service valves on
CORRECT
INCORRECT
Even
Slanted
Uneven
Rough
Smooth, shiny without scratches
Same length all around
INCORRECT FLARING
Inclined / Surface damaged / Cracked / Uneven
thickness