20079566
24
GB
Appendix - Electrical panel layout
START-UP AND SHUTDOWN
9
Appendix - Electrical panel layout
Thermostat
Flame signal
Air pressure switch
Gas pressure switch
Transformer
Gas valve V1
Gas valve V2
Motor
Operation
Loch-out signal
Fan speeed
(Rotations/min.)
Operating status
Description
Stop
Pre-purge
Start-up
Min. - Max.
Post-purging
Stop
Burner operation
Standby
Standby
On
Se
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l te
s
t
P
re
-p
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(
p
re
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re
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w
it
c
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s
t)
Pr
e
-p
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rg
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S
p
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e
d
S
ta
n
d
b
y
o
f s
ta
rt-
u
p
Ig
n
iti
o
n
S
ta
b
ili
s
a
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o
n
F
la
m
e
V
a
lv
e
g
a
s
Po
s
t-
p
u
rg
in
g
Off
Must disappear
Must appear
Non-influential
Variable between on and off
V
a
lv
e
te
s
t
S8993
Fig. 21
