M7484A
INSTALLATION
5
63-2273—1
Fig. 3—BCS 7700 internal block wiring diagram.
3
2
2
2
2
2
1
2
3
4
5
6
1
2
OIL
GAS
OIL SELECT
GAS SELECT
11K1
120 VAC
L1
(HOT)
L2
OIL LINE
PURGE VALVE
10K1
DIGITAL
MONITOR
DIGITAL
MONITOR
10K
11K
24VDC
RESET
PUSHBUTTON
RELAY
DRIVE
CIRCUIT
OPTOISOLATOR
INPUTS
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
50
51
52
53
54
55
56
ATOMIZING AIR
COMPRESSOR
MOTOR STARTER
TEMPERATURE
SENSOR
AMPLIFIER
SENSOR
POWER
SUPPLY
ANALOG
TO
DIGITAL
CONVERTOR
SIGNAL
COMMON
SIGNAL
SIGNAL
SIGNAL (BLUE)
SIGNAL (BLUE)
SIGNAL (BLUE)
COMMON
COMMON
COMMON (BLACK)
COMMON (BLACK)
COMMON (BLACK)
POWER (RED)
POWER (RED)
POWER (RED)
WATER TEMP.
SENSOR / CON-
FIG. ANALOG
OIL TEMP.
SENSOR
STEAM
PRESSURE
SENSOR /
CONFIG.
ANALOG
POWER
OIL
PRESSURE
SENSOR
GAS
PRESSURE
SENSOR
MICROCOMPUTER
PROGRAM MODULE AND
CHASSIS MODULE INTERFACE
SAFETY
RELAY
CIRCUIT
1K
OPTOISOLATOR
INPUTS
RUN-TEST
SWITCH
RELAY
DRIVE
CIRCUIT
2K
3K
4K
6K
7K
8K
ALARM
RELAY
9K
PLUG IN
FLAME
AMPLIFIER
RS485
BURNER
MOTOR
STARTER
4
5
6
10
L2
8
L1
11
12
16
7
6K1
PREINGINTION
INTERLOCKS
BURNER
SWITCH
RECYCLE
LIMITS
LOCKOUT
INTERLOCKS
F1, 10A
1K1
4K1
3K1
2K1
ATOMZING
AIR PROVING
SWITCH
PILOT
VALVE
IGNITION
TRANSFORMER
OIL MAIN
VALVE
GAS PRESSURE
SENSOR TEST VALVE
GAS MAIN
VALVE
KEYBOARD AND DISPLAY
LIQUID CRYSTAL DISPLAY
MICROCOMPUTER
A
B
C
A
B
C
KEYBOARD
120VAC
24VAC
40VA
INDICATES FEEDBACK SENSING TO
OPTOISOLATORS
WIRING SHOWN FOR INFRED FLAME DETECTOR FOR C7027
ULTRA VIOLET FLAME DETECTOR WIRE AS NOTED BELOW
– ULTRA VIOLETDECTECTOR BLUE LEAD - TERMINAL 31
– ULTRA VIOLET DETECTOR WHOTE LEAD - TERMINAL 30
THE ULTRA VIOLET FLAME DETECTOR WIRING IS POLARITY SENSITIVE,
REVERSING THE LEDS WIRES MAY DAMAGE THE SENSOR.
FOR ULTRA VIOLET C7012E,F WIRE AS NOTED BELOW:
– BLUE LEAD - TERMINAL 31 – YELLOW LEAD - TERMINAL 29
– WHITE LEAD - TERMINAL 27 – WHITE LEAD - L2
– BLACK LEAD - L1 – BLACK LEAD - L2
WIRE THESE TERMINALS WITH SHIEDLED CABLE PER SPECIFICATION. THE CABLE SHIELD
SHOULD NOT BE CONNECTED AT THE SENSOR END AND SHOULD BE TAPED TO AVOID
UNINTENTIONAL CONTACT. AT THE BOILER CONTROLLER END, THE SHIELD WIRES MUST BE
GROUNDED TO THE CONTROL PANEL WITH AS SHORT AS POSSIBLE A LEAD LENGTH.
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT WIRES TO ANY UNUSED TERMINALS.
TERMINALS 9, 17, 21, 22, 23, 28, 48 ARE NOT USED.
POWER SUPPLY FOR SYSTEM SENSORS.
FIELD WIRING INTERNAL CIRCUITRY.
3
2
1
G
T
Y
FIRING RATE MOTOR
OPEN
CLOSE
RS485
FLAME
DETECTOR
FIRING
RATE
M580A
49
E
15
14
13
9K2
9K1
ALARM
20
19
18
8K2
8K1
23
22
21
7K2
7K1
EARTH GROUND