A2B Accorroni HPE Series, User'S And Installer'S Manual

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Each unit is also provided, on the basement of the hydronic kit (accessible from the right sides panels), with a hole that can allow
to drain any condensation that may escape from plumbing pipes. As well as the pipes are well ‐ insulated, the production of
condensate is however very low and therefore the connection of a drainage pipe to that hole is not required.
7.4.2 Service valve
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 (inner diameter) 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.
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). In the case of V2+ series, you also need to connect a hose to the service valve and
make sure to fully discharge the heat exchanger by the mean of the knurled nut as described in paragraph 7.4.2.
7.4.4 Hydraulic circuit
Models: N ‐ i ‐ HWAK/WP V2 Models: N ‐ i ‐ HWAK/WP V2+
A
B
H
F
G
E
D
C A
B
H
F
G
E
D
I
C
KEY
A Plate heat exchanger F Air vent valve
B Water flow switch G
Safety valve
C Service valve H
Pressure gauge
D Pump I Reverse ‐ flow 4 ‐ way valve
E Expansion vessel
Drainage pipe fitting Drainage pipe fitting housing Drainage pipe fitting connected to the unit
Cap with gasket
Knurled nut