Spirax Sarco BC3250 - Page 30

IM-P403-89 EMM Issue 8
30
20 21 22
Bottom
blowdown
relay
Input
Open
Fig. 22 BCVxx Blowdown Valves with 24 Vac / dc Supply 1 cable / 2pt
* Must be common to both connection ends
** Must not be mixed between Vac and Vdc
1 2 3 4 5 6 7 8 9 10 11
Alarm 1 relay Control relay
3 A
Fuse
L
1 A
Fuse
N
Alarm
Norm
Input
3 A
Fuse
BACK
FRONT
Open
Input
3 A Fuse
Caution
live
terminal
AC supply Burner
supply
BCV4x,6x,7x & 8x
Optional Limit Switch
2a valve opening
2b valve closing
AVF234S
0V ( Common ) *
24 Vac / dc **
Limit Switch Box
4 5 6 7 8 9
S2 ( Xs2 )
Valve Closing
S1 ( Xs1 )
Valve Opening
2b 2a 21 1