i-HWAK V4
Chillers and inverter air / water heat pumps with axial fans
15
7.4.3
Plant drainage system
When it is necessary to drain the plant, close at first the inlet and outlet manual gate valves (not supplied) and then remove the
pipes that are disposed externally on the water inlet and on the water outlet in order to spill away the liquid contained in the unit
(for easier operation, it is recommended to install externally two draining valves, on the water inlet and on the water outlet,
between the unit and the manual gate valves).
7.4.4
Hydraulic circuit
Models: i-HWAK V4 06 and 08
Models: i-HWAK V4 10 and 12
A
B
H
F
G
E
D
C
i-HWAK 06/08 V4
A
B
H
F
G
E
D
C
i-HWAK 10/12 V4
SERIE i-HWAK V4 14 and 16
A
B
H
F
G
E
D
C
i-HWAK 14/16 V4
KEY
A
Plate heat exchanger
E
Expansion vessel
B
Flow switch
F
Manual air vent valve
C
Service valve
G
Safety valve
D
High efficiency circulating pump with
H
Pressure gauge
During the operations of charging/topping up, the plugs of the air vent valve must
be partially unscrewed in order to allow the air to flow freely out of the valves.
(1)
Plug of the air vent valve
WARNING:
The air vent valve is manual. Therefor, Purging should be performed
periodically in order to eliminate the accumulated air from the system as aleready
described.
You can use the service valve, when it is necessary to refill the plant or adapt the
concentration of glycol. Unscrew the cap of the service valve and connect to the
hose a pipe of 14 mm or (inner diameter size - check the faucet model that is
installed on your own unit) connected to the water network, and then load the
system by unscrewing the knurled nut. When the operation is concluded, retighten
the knurled nut and screw on the cap. In any case, we recommend you to use for
the water loading of the plant an external tap whose arrangement is by the
installer.
Cap with gasket
Knurled nut
1
