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Device Initiate Standby Purge
R7120D
10 sec.
*
2000
R7120D
1002
R7120D
3007
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.
PURGE
TIMER
SEQUENCE
STATUS
LED PANEL
KEYBOARD
DISPLAY
MODULE
(OPTIONAL)
Table 3. Sequence Timing for Normal Operation.
Flame
Establishing
Period
Pilot
Main
**
4 or 10
10, 15
sec.
a
sec.
or
intermittent.
10 or 15
sec
10 sec. or
intermittent
WIRING
SUBBASE
ADAPTER
PLATE
RUN/TEST
SWITCH
RELAY
MODULE
CONFIGURATION
JUMPERS
RESET
BUTTON
Fig. 9. R7120D Relay Module, exploded view.
Post
Purge
Run
Timing Interlock Circuits
*
15 sec. Pre-Ignition,
Running, Low Fire
Pre-Ignition,
Lockout High and
Low Fire
Pre-Ignition,
Running, isolated
Low Fire.
9
R7120D BURNER CONTROL MODULES
Firing
Energy
Rate
Saving
Circuit
Pre-Purge
4-wire
No
modulating
2-wire
isolated
On-Off-On
contacts
FLAME
AMPLIFIER
M32642
Approval
Code
Bodies
UL/CSA
Modulating
FM/IRI
Modulating
UL/CSA
On-Off.
66-1196EF—01
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