R7120D BURNER CONTROL MODULES
66-1196EF—01
6
Fig. 4. Internal block diagram of the R7120D3007 with pre-ignition interlocks.
L1
L2
S2
S1
A
8
7
6
5
13
12
11
12
10
X
W
R
B
W
R
B
11
12
10
X
F
X
P
D
M
3
L2/N
L1/L
11
10
FLAME
DETECTOR
(UV)
BURNER/
BLOWER
MOTOR
VALVE
PROOF OF
CLOSURE
FLAME MONITOR
TERMINALS
FLAME MONITOR
TERMINALS
4-20 mA
MOTOR
135 OHM
FIRING RATE
MOTOR
4-20mA
CONTROLLER
135 OHM
CONTROLLER
AUTO
LO
COM
HI
AUTO
LO
COM
HI
LIMIT
OPERATING
SWITCHES
BURNER
SWITCH
RUNNING
INTERLOCK
D10/EP100 OR D20/EP200
TYPICAL WIRING
LOW FIRE START
INTERLOCK
PURGE INTERLOCK
MASTER
SWITCH
LOCKOUT
ALARM
MAIN FUEL
VALVE(S)
PILOT
VALVE(S)
IGNITION
TRANSFORMER
1
1
1
1
1
1
1
2
3
3
2
2
USED ONLY ON D10 OR EP100 SERIES PROGRAMMERS.
LOCATE THE PURGE INTERLOCK WIRE CONNECTION ON TERMINAL D, REMOVE AND CONNECT TO TERMINAL M.
R120D2000, JUMPER WIRE ADDED BETWEEN 8 AND M PROVIDES 30 MFEP ON TERMINAL 6, IF JR2 IS REMOVED.
M32638