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R4140G FLAME SAFEGUARD PROGRAMMING CONTROLS
60-2337—3
23
Ignition Trials
60 seconds—M4A closes; power is applied to terminals
18, 5 and 6, energizing the ignition transformer and
pilot valve (or main fuel valve(s) on terminal 7 if using
direct spark ignition).
— When a flame is detected, relay 2K pulls in, 2K2
opens, and the LS HTR stops heating; 2K1 and
2K3 close.
65 seconds—M9B opens; 5 second ignition (terminal 18)
de-energizes (pilot only until 70 seconds).
66 seconds—M3A closes, bypassing the low fire switch
and the timer switch.
70 seconds—M2B opens; pilot or ignition trial ends; a
flame must be detected by this time (2K pulled in and
2K1 closed) or safety shutdown occurs and the lockout
switch trips.
— M2A closes; power is applied to terminal 7,
energizing the main fuel valve(s).
— M11B opens; prevents 2K from pulling in after this
time.
80 seconds—M6B opens; 10 second interrupted pilot/
ignition (terminal 5) de-energizes.
85 seconds—M4A opens; 15 second interrupted pilot/
ignition (terminal 6) de-energizes.
100 seconds—M8A closes, M8B opens; firing rate motor is
released to modulate under control of the Series 90
Controller.
104 seconds—M5B opens; timer stops with the system in
the run condition.
Run Period (Burner is Firing)
Postpurge and Stop
104 seconds—When the operating setpoint is reached, the
burner controller contacts open; relay 1K and the main
fuel valve(s) (terminal 7) de-energizes.
— 1K2 closes; timer motor starts; postpurge begins.
— When the flame goes out, relay 2K drops out.
112 seconds—M8A opens; firing rate motor stops
modulating under control of the Series 90 Controller.
116 seconds—M8B closes; firing rate motor drives toward
low fire position (closed).
120 seconds—M1B opens; timer and burner motor stop;
cycle ends.
WIRING (FIG. 15 AND 16)
CAUTION
1. Disconnect power supply before beginning wiring
to prevent electrical shock and equipment
damage.
2. Wiring must comply with all applicable local
electrical codes, ordinances, and regulations.
3. All wiring must be NEC Class 1 (line voltage).