R7120D BURNER CONTROL MODULES
9
66-1196EF—01
a
15 second MFEP with JR2 clipped, and 30 seconds with JR2 clipped and jumper from terminal M to terminal 8.
*
STANDBY and RUN can be an infinite time period.
** PURGE will be determined by which ST7800A purge card is selected; 15 timings are available from 2 seconds to 30 minutes.
Fig. 9. R7120D Relay Module, exploded view.
Table 3. Sequence Timing for Normal Operation.
Device
I
nitiate Standby Purge
Flame
Establishing
Period
Run
Post
Purge
Timing Interlock Circuits
Firing
Rate
Circuit
Energy
Saving
Pre-Purge
Approval
Code
Bodies
Pilot
Main
R7120D
2000
10 sec.
*
**
4 or 10
sec.
10, 15
sec.
a
or
intermittent.
*
15 sec. Pre-Ignition,
Running, Low Fire
4-wire
modulating
No
UL/CSA
Modulating
R7120D
1002
10 or 15
sec
Pre-Ignition,
Lockout High and
Low Fire
FM/IRI
Modulating
R7120D
3007
10 sec. or
intermittent
Pre-Ignition,
Running, isolated
Low Fire.
2-wire
isolated
On-Off-On
contacts
UL/CSA
On-Off.
WIRING
SUBBASE
BURNER CONTROL
RELAY
MODULE
ADAPTER
PLATE
KEYBOARD
DISPLAY
MODULE
(OPTIONAL)
RESET
POWER
PILOT
FLAME
MAIN
ALARM
FLAME
AMPLIFIER
M32642
PURGE
TIMER
RESET
BUTTON
CONFIGURATION
JUMPERS
RUN/TEST
SWITCH
SEQUENCE
STATUS
LED PANEL