HTW PREMIUM R32 Manuel De L'utilisateur Et D'installation page 43

manifold valve assembly reads -1.0Mp (-75cmHg), if not, it indicates there is leak
somewhere. Then, close the switch fully and then stop the vacuum pump.
(6). Wait for sorne time to see if the system pressure can remain unchanged, 3 minutes for
the units less than 18K, 5 minutes for the 18K-24K units, 1 O minutes for the 36/42/48/60K
units. During this time, the reading of the pressure gauge at the low pressure side can
not be larger than 0.005Mp (0.38cmHg).
(7). Slightly open the liquid valve and let sorne refrigerant go to the connection pipe to
balance the pressure inside and outside of the connection pipe, so that air will not come
into the connection pipe when removing the hose. Note that the gas and liquid valve can
be opened fully only after the manifold valve assembly is removed.
(8). Place back the caps of the liquid valve, gas valve and also the service port.
P r essur e gauge (Low- press ure ) gaug e manif old
Gas valve
Service port
Fig.10
Note:
For the large-sized unit, it has the service port for both the gas valve and the liquid valve.
During evacuation, it is available to connect two hoses of the manifold valve assembly to two
service ports to quicken the evacuating speed.
2. Additional Charge
Refrigerant suitable for a piping length of 5m is charged in the 12-42K outdoor unit at the
factory, and for 48-60K outdoor unit refrigerant is charged for a piping length of 7.5m.
When the piping of 18-42K unit is longer than 7.5m or the piping of 48-60K unit is longer
than 9.5m, additional charging is necessary.
7
HTW-UO-035SKR32
HTW-UO-052SKR32
HTW-UO-071SKR32
HTW-UO-105SKR32
HTW-UO-120SKR32
Pressure gauge (Hi-pressure )
Vacuum pump
Model Additional Refrigerant Amount for Extra Pipe
15===================
. . . . .
·•
16g/m
30g/m