Page 26
12-Burner Control A3
WARNING
Shock hazard. Spark related components
contain high voltage which can cause
personal injury or death. Disconnect
power before servicing. Control is not
result. If control is inoperable, simply
replace the entire control.
The ignition controls are located in the heat section areas
below the compressors. The controls are manufactured
UTEC. See TABLE 4 for LED codes.
attempt sequence provides three trials for ignition before
After lockout, the ignition control automatically resets and
provides three more attempts at ignition. Manual reset af-
ter lockout requires breaking and remaking power to the
ignition control. See FIGURE 14 for a normal ignition se-
timings for the ignition controls are shown in FIGURE 16.
TABLE 4
LED Flashes Indicates
Slow Flash Control ok, no call for heat
Fast Flash Control ok, call for heat present.
Internal control fault or no power
Steady On Failure Control internal failure
1 Flash Rollout switch open
2 Flashes
Limit open or lockout from to many
tries during a single heat demand
3 Flashes
Pressure switch open with inducer
4 Flashes
losses.
Flame sensed out of sequence
6 Flashes
Pressure switch closed with induc-
7 Flashes Gas valve relay failure
8 Flashes
Lockout due to too many pressure
switch openings during one heat
demand
NORMAL IGNITION SEQUENCE - TIMINGS NOMINAL
THERMOSTAT DEMAND
COMBUSTION AIR BLOWER
GAS VALVE
IGNITION SPARK
BLOWER
011053030SDNOCES
OFF / OPEN
END OF
DEMAND
1
COMBUSTION AIR PROVE SWITCH
5 570
FIGURE 14
RETRIALS - IGNITION ATTEMPT SEQUENCE - TIMINGS NOMINAL
THERMOSTAT DEMAND
COMBUSTION AIR BLOWER
GAS VALVE
IGNITION SPARK
BLOWER
SECONDS0 30 35 70
ON
OFF
65 100 105
WATCHGUARD
COMBUSTION AIR PROVE SWITCH
5
FIGURE 15
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