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Fig. 2—BCS 7700 internal wiring diagram.
OIL
GAS
11K1
55
10K1
DIGITAL
50
MONITOR
DIGITAL
51
MONITOR
RELAY
10K
DRIVE
CIRCUIT
11K
RESET
PUSHBUTTON
RUN-TEST
SWITCH
OPTOISOLATOR
INPUTS
RELAY
DRIVE
A
CIRCUIT
B
RS485
C
6K1
L1
PREINGINTION
INTERLOCKS
BURNER
SWITCH
RECYCLE
LIMITS
KEYBOARD AND DISPLAY
LIQUID CRYSTAL DISPLAY
RS485
A
MICROCOMPUTER
B
C
9
KEYBOARD
1
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
– WHITE LEAD - TERMINAL 27
– BLACK LEAD - L1
2
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
3
PROTECTION AS REQUIRED.
52
OIL SELECT
53
GAS SELECT
OIL LINE
PURGE VALVE
54
ATOMIZING AIR
56
COMPRESSOR
MOTOR STARTER
OPTOISOLATOR
TEMPERATURE
INPUTS
SENSOR
AMPLIFIER
24VDC
SENSOR
POWER
SUPPLY
5
ANALOG
TO
DIGITAL
CONVERTOR
MICROCOMPUTER
PROGRAM MODULE AND
CHASSIS MODULE INTERFACE
SAFETY
RELAY
CIRCUIT
24VDC
2K
3K
4K
6K
PLUG IN
ALARM
9K
FLAME
RELAY
7K
AMPLIFIER
8K
BURNER
4
MOTOR
STARTER
5
7
LOCKOUT
1K1
INTERLOCKS
6
8
F1, 10A
120VAC
24VAC
INDICATES FEEDBACK SENSING TO
OPTOISOLATORS
– YELLOW LEAD - TERMINAL 29
– WHITE LEAD - L2
– BLACK LEAD - L2
L1
L2
(HOT)
3
49
120 VAC
SIGNAL
WATER TEMP.
32
2
SENSOR / CON-
COMMON
FIG. ANALOG
33
8
SIGNAL
34
OIL TEMP.
2
COMMON
SENSOR
35
POWER (RED)
36
STEAM
PRESSURE
SIGNAL (BLUE)
37
SENSOR /
2
CONFIG.
COMMON (BLACK)
38
ANALOG
8
POWER
39
SIGNAL
40
COMMON
41
POWER (RED)
42
OIL
SIGNAL (BLUE)
PRESSURE
2
43
SENSOR
COMMON (BLACK)
44
POWER (RED)
45
GAS
SIGNAL (BLUE)
2
PRESSURE
46
SENSOR
COMMON (BLACK)
47
24
1K
FIRING
25
RATE
26
27
28
29
30
7
1
31
L2
PILOT
VALVE
4K1
IGNITION
10
TRANSFORMER
3K1
OIL MAIN
11
VALVE
ATOMZING
16
AIR PROVING
SWITCH
GAS PRESSURE
SENSOR TEST VALVE
2K1
GAS MAIN
12
VALVE
40VA
FIRING RATE MOTOR
2
OPEN
3
1
CLOSE
G
T
Y
DO NOT CONNECT WIRES TO ANY UNUSED TERMINALS.
4
TERMINALS 9, 17, 21, 22, 23, 28, 48 ARE NOT USED.
5
POWER SUPPLY FOR SYSTEM SENSORS.
6
FIELD WIRING
INTERNAL CIRCUITRY.
7
SEE FLAME DETECTOR WIRING FIGURE IN FORM NO 63-2991.
8
SEE TYPICAL STACK TEMPERATURE SETUP FIGURE
IN FORM 63-2991.
9
USE 120 OHM TERMINATING RESISTOR ON DEVICE FURTHEREST
FROM BC7700 CHASSIS MODULE (120 OHM TERMINIATING
RESISTOR INSTALLED BETWEEN TERMINALS A AND B.)
3
SPECIFICATIONS
E
EARTH GROUND
20
15
8K2
9K2
19
LOAD
14
ALARM
DEMAND
8K1
9K1
18
13
23
7K2
22
UNUSED
7K1
21
2
FLAME
DETECTOR
M602C
63-2287—1
ST7700
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