3.9
WATER FLOW GUAGE
The. water. flow. gauge. (4. fig.. 3). intervenes,.
blocking. burner. functioning,. if. it. detects.
that. there. is. insufficient. water. circulating.
in. the. primary. circuit. and. in. the. case. the.
600
500
400
300
200
100
0
82
pump.not.functions.
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.
25/55 OF ErP
200
400
600
3.10
HEAD AVAILABLE TO SYSTEM
(fig. 17)
Residual. head. for. the. heating. system. is.
shown. as. a. function. of. rate. of. flow. in. the.
graph.in.fig..17..
800
1000
1200
PORTATA.(l/h)
FLOW.RATE.(l/h)
Fig..17