Page 24
D-GAS HEAT COMPONENTS
1-Control Box Components A3, A55, T3, K13
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.
Burner Ignition Control A3
The ignition controls are located in the heat section areas
below the compressors. The controls are manufactured
UTEC. See table 6 for LED codes.
The ignition control provides three main functions: gas
attempt sequence provides three trials for ignition before
provides three more attempts at ignition.
Manual reset after lockout requires breaking and remak-
sequence with retrials (nominal timings given for simplic-
TABLE 6
LED Flashes Indicates
Internal control fault or no power
Control internal failure
Rollout switch open
Limit open or lockout from to many
tries during a single heat demand
Pressure switch open with inducer
losses.
Pressure switch closed with induc-
Gas valve relay failure
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
IGNITION TRIAL
011053030SDNOCES
ON / CLOSED
OFF / OPEN
END OF
DEMAND
1
COMBUSTION AIR PROVE SWITCH
5 570
FIGURE 11
RETRIALS - IGNITION ATTEMPT SEQUENCE - TIMINGS NOMINAL
THERMOSTAT DEMAND
COMBUSTION AIR BLOWER
GAS VALVE
IGNITION SPARK
BLOWER
IGNITION TRIAL
SECONDS0 30 35 70
ON
OFF
65 100 105
WATCHGUARD
LOCKOUT
COMBUSTION AIR PROVE SWITCH
5
FIGURE 12
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