89
ES
PT
GB
3.8
WATER FLOW
GUAGE
The water flow gauge (8 fig. 4) intervenes,
blocking burner functioning, if it detects
that there is insufficient water circulating in
the primary circuit (< 450 l/h).
To r es t or e burner functioning, check
system pressure and the functioning of the
pump and the flow switch, and the cleaning
of the “Aqua Guard Filter System” filter.
N.B.: when replacing the flow meter valve,
verify that the arrow printed on its body
is pointing in the same direction of the
water flow.
3.9
HEAD AVAILABLE TO SYSTEM
Residual head for the heating system is
shown as a function of rate of flow in the
graph in fig. 14.
To obtain the maximum head available to
the system, turn off the by-pass by turning
the union to the vertical position (fig. 15).
0
600
200
1200
1000
800
600
400
PORTATA (l/h)
PREV
ALENZA RESIDU
A (mbar)
500
400
100
200
300
Mur
elle HE BF - T
OP BF
25 BF - TOP 25 BF
30 BF - TOP 30 BF
35 BF - TOP 35 BF
con by-pass
senza by-pass
By-pass inserito
By-pass escluso
Fig. 15
0
600
200
1200
1000
800
600
400
PORTATA (l/h)
PREV
ALENZA RESIDU
A (mbar)
500
400
100
200
300
Mur
elle HE BFT - T
OP BFT - S
Y
S
TEM
12 BFT - 12 SYSTEM
20/25 BFT - 20 SYSTEM
con by-pass
senza by-pass
30 BFT - TOP 25 BFT - 30 SYSTEM
35 BFT - TOP 30 BFT - 35 SYSTEM
Fig. 14
RESIDU
AL
HEAD (mbar)
FLOW RATE (l/h)
RESIDU
AL
HEAD (mbar)
FLOW RATE (l/h)
By-pass on
By-pass off
By-pass on
By-pass off
By-pass off
By-pass on
Summary of Contents for MURELLE HE 12 BFT
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