Wiring Diagram Boiler house Level controls
2
STANDBY/ BURNER INPUT (24Vdc)
14
MIN/ BB VALVE
CLOSE
OPEN
MAX
1
1
2.3 62
2
3
3
4
1
1
M 0.5 A (semi-delay)
12
13
13
13
11
7
Conductivity Probe
8
9
10
5
6
Item 1
Fixing screws for terminal strip
2 MIN alarm output contact or Bottom Blowdown (BB) output contacts 3 Output contacts for activating the control valve 4 MAX alarm output contact 5 Connection of supply voltage 24 Vdc with fuse 0.5 A (semi-delay) provided on site 6 Actual value output 4-20 mA 7 2 wire Pt 100 temperature sensor input 8 Bottom blowdown (BB) link input 9 Bottom blowdown (BB) switch input 10 Data line for operating and display unit BHD50 11 Conductivity Probes - See figure 5 12 Central earthing point (CEP) in control cabinet 13 Earthing point at the auxiliary equipment (e.g. CP30/CP40) 14 Standby/burner input (24 Vdc), ON = standby/burner on, OFF = normal running/burner off
TI-P693-21 EMM Issue 1
Page 4 of 5
BCR3250 BHD50 Blowdown Controller Operating and Display Unit
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