82
gas. valve. when. the. fumes. are. continual-
ly. forced. back. into. the. environment,. in. a.
quantity.that.can.be.dangerous..If.the.boiler.
repeatedly. stops,. it. will. be. necessary. to.
carefully. check. the. chimney,. and. to. carry.
out.all.modifications.and.take.all.measures.
necessary.to.restore.it.to.an.efficient.wor-
king.state..
After. every. intervention. carried. outon. the.
device,. check. correct. functioning.. In. the.
case.of.replacement,.use.only.original.spare.
parts.
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..
0
600
200
1200
1000
800
600
400
PORTATA.(l/h)
PREV
ALENZA.RESIDUA.(mbar)
500
400
100
200
300
Mur
el
le
.ErP
25 OF ErP
30 OF ErP
Fig..17
RESIDUAL
.HEAD
.(mbar)
FLOW.RATE.(l/h)
Summary of Contents for Murelle 25 OF
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