R7140G,L,M BURNER CONTROL MODULES
66-1153—2
24
1.
In Pre-Purge Drive To High Fire Position (R7140L), the
Run/Test Switch, when placed in the TEST position,
holds in PREPURGE with the firing rate motor in the
High Fire position.
2.
In the measured PREPURGE sequence, the Run/Test
Switch, when placed in the TEST position, causes the
PREPURGE timing to stop. The firing rate motor is in
the High Fire position.
3.
In Pre-Purge Drive to Low Fire position, the Run/Test
Switch, when placed in the TEST position, holds the
burner sequence in PREPURGE with the firing rate
motor in the Low Fire position.
4.
In PFEP, the Run/Test Switch, when placed in the TEST
position, stops the timer during the first 8 seconds when a
10-second PFEP is selected or during the first 3 seconds
when a 4-second PFEP is selected, allowing pilot-turn-
down test and other burner adjustments to be made. This
activates a 15-second flameout timer that permits pilot
flame adjustment without nuisance safety shutdowns. The
Run/Test Switch is ignored during PFEP for the R7140L if
terminals 5 and 7 or 7 and 6 are jumpered.
5.
During Run, the Run/Test Switch, when placed in the
TEST position, drives the firing rate motor to the Low
Fire position.
NOTE: When R7140 is switched to the Test mode, it stops and
holds at the next Run/Test Switch point in the operating
sequence. Make sure that the Run/Test Switch is in the
RUN position before leaving the installation.
SETTINGS AND ADJUSTMENTS
Selectable Site-Configurable Jumpers
The R7140 has three site-configurable jumper options; see
Fig. 19 and Table 7. If necessary, clip the site-configurable
jumpers with side cutters and remove the resistors from the
Relay Module.
The R7140M has two additional jumpers located on the back
of the chassis. These must be cut if a spring return damper
motor is used.
Fig. 19. Selectable site-configurable jumpers.
Table 7. Site Configurable Jumper Options.
a
Pilot Valve/First Stage Oil Valve (Valve/Start) terminal 6.
b
A 30 second MFEP can be accomplished by adding a jumper wire between terminals 15 and 8.
SERVICE NOTE
: Clipping and removing these site-configurable jumpers enhances the level of safety. Removal after 200 hours
of main valve operation will result in a hard lockout, Code 110.
RUN/TEST SWITCH
NOTE: CONFIGURATION JUMPERS SHOWN FOR RM7800G/RM7840G.
SELECTABLE CONFIGURATION JUMPERS
M12301
Jumper Number
Description
Intact
Clipped
RM7800/RM7840 Type
JR1
Pilot Flame Establishing
Period (PFEP)
10 seconds
4 seconds
All
JR2
Pilot Valve
a
/Main Flame
Establishing Period (MFEP)
10 seconds
Intermittent
15 or 30 seconds Interrupted
b
R7140G
JR3
Start-up Interlock Check
Disabled
Enabled
All