CB780E/CB784E RELAY MODULES WITH VALVE PROVING
32-00150—03 14 750-234
Fig. 9. Typical wiring subbase and sequence for the CB780E/CB784E, with Valve Proving enabled.
POWER
00
OPERATING
CONTROLS
AND
INTERLOCKS
BURNER
FLAME
SIGNAL
FIRING
RATE
MOTOR
INITIATE
(INITIAL
POWERUP
ONLY)
POWER
STANDBY
POWER
PREPURGE
HOLD
DRIVE TO
HIGH FIRE
PREPURGE
HOLD
DRIVE TO
LOW FIRE
POWER
PILOT
FLAME
MAIN
POWER
PFEP
10 SEC.
(4 SEC. IF
JR1
CLIPPED
PILOT
FLAME
MAIN
POWER
MFEP
PILOT
FLAME
MAIN
RUN
POWER
POSTPURGE
POWER
STANDBY
00 00 10 25 00 1520
SWITCHING
MOTOR ACTION
BURNER/BLOWER MOTOR
IGN.
LIMITS AND BURNER CONTROLLER CLOSED
LOCKOUT INTERLOCKS CLOSED
PREIGNITION INTERLOCK CLOSED
LOW FIRE SW.
SAFE START CHECK FLAME PROVING
10 SEC. IGN./PILOT
8
10
5
5 SEC.
17
TO
7
20TO
5
18
TO
13 15
TO
13 12
TO
M24790A
INTERLOCK. CHECK
HIGH FIRE SW.
19TO
13 14
TO
13 14
TO
5
4
L1
MAIN VALVE
9
MV2 IS MAIN VALVE CLOSEST TO THE BURNER.
JR2 REMOVED FOR PILOT SEQUENCE.
1
TIMED
PREPURGE
POWER
FLAME
MAIN
PILOT
ALARM
POWER
FLAME
MAIN
PILOT
ALARMALARMALARMALARM
00
IC
SSC
LED
DISPLAY
PII
MV2
21
1
2
2
M28583A
G
L2
3
4
5
6
7
8
9
10
F
(L1)
13
14
15
16
17
18
19
20
21
22
12
LOCKOUT INTERLOCKS
(INC. AIR FLOW SWITCH)
MASTER
SWITCH
LOW FIRE
START SWITCH
5 SECOND IGNITION
(EARLY SPARK
TERMINATION)
MAIN FUEL VALVE 1
BURNER MOTOR
(BLOWER)
HIGH FIRE
COMMON
LOW FIRE
MODULATE
120V ALARM
10 SEC. INTERRUPTED
PILOT/IGNITION
PREIGNITION
INTERLOCK
SERIES 90
FIRING RATE
MOTOR
SERIES 90
CONTROLLER
FLAME DETECTOR
120V, 50/60 Hz (EC7840L 220-240 VAC) POWER SUPPLY.
PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
DO NOT WIRE TO ANY UNUSED TERMINALS.
SEE FLAME DETECTOR INSTALLATION INSTRUCTIONS
FOR CORRECT WIRING.
JR2 INTACT ON RM7800L/40L/EC7840L FOR DSI
FUNCTION.
FOR DIRECT SPARK IGNITION (OIL
OR GAS)
JR2 - INTACT
IGNITION
TRANSFORMER
MAIN VALVE 2
BURNER CONTROL
R
W
B
R
W
B
L1
(HOT)
L2
1
9
21
10
L2
833-2725
MV2 VALVE
MAIN VALVE 1
2
1
3
4
3
HIGH FIRE
PURGE SWITCH
2
VALVE PROVING
SWITCH
LIMITS
To Next Page
Loading...
Need help?
General
