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R7120D BURNER CONTROL MODULES
L1
RESET
PUSHBUTTON
STATUS LEDs
LIMITS CONTROLLER
DDL
DDL
COMMUNICATIONS
1
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
R7120D2000 DOES NOT HAVE A PURGE INTERLOCK
66-1196EF—01
CONFIGURATION
JUMPERS
RUN/TEST
SWITCH
MICROCOMPUTER
SAFETY RELAY
CIRCUIT
R1
PII
13
LOW FIRE SWITCH
D
PURGE INTERLOCK
2
SWITCH
8
6K1
3K1
KEYBOARD
DISPLAY MODULE
RS485
1
2
REMOTE
3
RESET
Fig. 2. Internal block diagram of the R7120D1002 and D2000.
L1
(HOT)
L2
1
120 Vac,
50/60 Hz
PLUG-IN PURGE
TIMER CARD
FLAME SIGNAL
PLUG-IN
FLAME
AMPLIFIER
TEST
2K
3K
4K
RELAY
5K
DRIVE
6K
CIRCUIT
7K
8K
9K
1K
POWER SUPPLY
RUNNING/
LOCKOUT
INTERLOCK
1K1
4K1
3
P
7K1
2K2
HIGH FIRE
X
8K1
COMMON
10
8K2
MODULATE
11
9K1
9K2
LOW FIRE
12
4
L2
TEST
JACK
F
G
17
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
CONTROL
POWER
R1
5
PILOT
6
PILOT/V2
7
MAIN VALVE
M
BLOWER
A
ALARM
INDICATES FEEDBACK SENSING
OF RELAY CONTACT STATUS
AND LINE VOLT INPUTS
FIELD WIRING
INTERNAL WIRING
M32636
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