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R4140G FLAME SAFEGUARD PROGRAMMING CONTROLS
60-2337—3
19
Fig. 12. Timer sequence for R4140G1171, R4140G1122 and R4140G1114 Programmers.
M10057
1
2
3
4
5
6
TERMINAL NUMBERS (CIRCLED).
SLOPE DEPENDS ON MOTOR TIMING.
TIMER STOPS AT 60 SECONDS UNTIL LOW FIRE PROVING
SWITCH CLOSES.
FIRING RATE MOTOR MODULATES UNDER CONTROL OF SERIES 90
CONTROLLER FROM 148 TO 168 SECONDS (INCLUDING RUN
PERIOD WHILE BURNER IS FIRING).
TIMER STOPS FOR THE RUN PERIOD WITH THE BURNER FIRING.
RUNNING INTERLOCKS (INCLUDING THE AIRFLOW SWITCH)
MUST REMAIN CLOSED THROUGH THE RUN PERIOD.
MOTOR
DRIVES
DAMPER
OPEN
MOTOR
DRIVES
DAMPER
CLOSED
MOTOR DRIVES
DAMPER CLOSED
2
2
2
2
4
3
LOW
LOW
12 TO 11
TIMER
SECONDS
TIMER DIAL
TIMER MOTOR
BURNER
MOTOR
(BLOWER)
5 SECOND
INGITION
INTERRUPTED
PILOT/INGITION
MAIN FUEL
VALVE(S)
(GAS OR OIL)
ACTUAL
DAMPER
OPERATION
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180
START
STOP
START
STOP
START
STOP
IGN
MAIN
PURGEPREPURGE
PILOT
6
RUNNING INTERLOCKS (PROVEN AIRFLOW)
1
3
8
18
5
6
6
7
3
5
30 SECONDS (WITHOUT JUMPER)
60 SECONDS (WITH JUMPER)
10 SECONDS
MODULATE
LOW FIRE POSITION
14 TO 11
1
HIGH FIRE POSITION
10 TO 11
Step-By-Step Operation
(R4140G1171, R4140G1122 and R4140G1114)
Start and Prepurge
0 seconds—On a call for heat, the burner controller contacts
close. If the limits and start interlock(s) are closed, relay
1K pulls in through M7B, 2K2, the LS HTR (lockout
switch heater—thus proving its continuity), and LS2.
— 1K1 closes and 1K2 opens; timer starts (through
M3A and M5B); power is applied to terminal 8,
starting the burner motor (blower); 1K3 closes.
— Prepurge begins.
5 seconds—M10A closes, M10B opens; firing rate motor
drives toward high fire position (open).
6 seconds—M1B closes, bypassing 1K1; the timer
completes its revolution if shutdown occurs.
10 seconds—M11B closes; flame relay 2K can pull in if a
flame (or a condition simulating a flame) is detected. If
detected during prepurge (until 67 seconds), 2K pulls
in, 2K2 opens, 1K drops out, and the system shuts
down; the timer completes its revolution and recycles
the programmer.
13.5 seconds—M7B opens; running interlocks must be
closed (airflow must be proven) or 1K drops out, 1K3
opens, and ignition trials cannot be started. Running
interlocks must remain closed through the Run period
or the system shuts down; the timer completes its
revolution and recycles the programmer.
40 seconds—M10B closes; firing rate motor drives toward
low fire position (closed).
60 seconds—M3A opens; timer stops until the low fire
proving switch closes; timer can be stopped by opening
the timer switch (until 76 seconds when M3A closes
again).
67 seconds—M7A closes; the LS HTR (lockout switch
heater) begins heating in preparation for ignition trials.