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1.8
Circulator residual discharge head
The boiler is equipped with a high-efficiency modulat-
ing circulator (already hydraulically and electrically con-
nected) whose effective available performance values
are indicated in the graphs below.
Modulation is managed by the board, via parameter
P4.05 (INSTALLER access level).
1000
950
900
850
800
750
700
DIFFERENTIAL PRESSURE SWITCH
650
600
INTERVENTION ZONE
550
500
450
400
350
300
250
200
150
100
50
0
0
100
200
300
400
500
1.9
Variable speed circulator
The modulating circulator function is only active in heat-
ing mode. When switched to DHW, the circulator always
works at the maximum speed. The modulating circulator
function only applies to the circulator of the boiler, not to
circulators of any external devices that may be connected
(e.g. a relaunch circulator).
In this mode, the boiler board determines what flow rate
value to adopt according to the instantaneous flow rate
supplied by the boiler. Go to menu P4, parameter P4.05, if
you want to change the modulation value:
100= no modulation
60 = max modulation
85= default value
600
700
800
900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400
flow rate (l/h)
The boiler has an anti-lockout system that launches
an operating cycle after 24 hours of stoppage in any
operating status.
9
The "anti-locking" function is only activated when
the boiler is electrically powered.
1.10 Manual circulator reset
If a manual reset is needed, proceed as follows:
ƒ remove the circulator plug
ƒ use a flathead screwdriver to rotate the shaft, taking care
not to force the seat.
HPR 55-70
11
GENERAL REMARKS
PWM P4.05=100 (No Mod.)
PWM P4.05=85 default
PWM P4.05=60
HPR 35-45
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