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12 PRIMARY CIRCUIT PRESSURE SWITCH
12 .1 Function
The Primary circuit pressure switch ("A" in Figure 12.1) function
is to check the presence of water in the primary hydraulic circuit
and that the pressure is above the minimum.
B
Figure 12 .1
This device is connected to the main electronic control p.c.b. and
if, it does not activate the control board will indicate that a fault
condition (see section "4.1 Display diagnostic" on page 13 of
this manual) has occurred.
12 .2 Checks
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
Electrical check
It is possible to verify the general operation of the switch by
measuring the electric resistance between the contacts "C" and
"N.O." of the switch.
1 Measure the electrical resistance between the tabs "C" and
"N.O." (Figure 12.2).
The contact must close (resistance zero) with C.H. pressure
of 0,35 bar or higher.
N .O .
Figure 12 .2
PRIMARY CIRCUIT FLOW SWITCH
A
C
12 .3 Removal
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Remove the front and right hand side panels of the case, turn
off the flow and return isolation valves and empty the primary
circuit.
2 Remove the fixing spring "E" (Figure 12.3) and remove the
primary circuit pressure switch "D".
3 Disconnect the connectors "F" (Figure 12.3).
D
E
Figure 12 .3
4 Reassemble the primary circuit pressure switch in reverse
order of removal.
Warning: to lubricate the O-ring gaskets exclusively
use a silicone base grease compatible to be in con-
tact with foods and approved by the local water Au-
thorities .
F
- 33 -
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