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Engineered air DG series Manual de usuario Pagina 16

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A G-TRAC MANUAL
Page 11 Revised: 03/17/99
Pre-Purge Timer Light
The pre-purge timer light will activate when there is a call for heat and the burner is in the pre-purge mode.
The combustion blower should be running but there should be no flame. When this light goes out, if the heat
call is still present, the burner-enabled light will come on. Note that pre-purge time is pre-set at the factory. The
higher the burner turn down and the larger the heat exchanger, the longer the pre-purge. Pre-purge time is
set by cutting jumpers as noted in Section XIV about field replacement of the control.
Burner Enabled Light
Pre-purge time is complete. The burner should be firing and will maintain discharge temperature as per the
control system wired to the G-TRAC.
XIII. TROUBLE SHOOTING
Supply Blower Not Starting
G-TRAC DIAGNOSTIC LIGHTS
HEAT
CALL
PRE-
PURGE
TIMER
BURNER
ENABLE
COMBUS-
TION
BLOWER
OPERATING CONDITIONS OR
PROBLEM DIAGNOSIS
OFF OFF OFF OFF
Check for 24 VAC on terminals “H and N”.
Allow 45 seconds for fan start up.
ON OFF OFF OFF Check for shorted combustion air switch.
ON ON OFF OFF Check combustion blower motor circuit ***
ON ON OFF RUNNING
Normal for morning start up. Supply fan is
held off by pre-purge cycle
XXX
ON OFF OFF ON
No power to A/S terminal. Check for open
A/S or failed combustion fan.
OFF OFF OFF ON
Pre-purge complete. No heat call, S/A fan
will start in 36 seconds.
ON OFF ON ON Blower will start in 36 seconds.
*** This condition is unlikely to occur. If the combustion blower stops, The air switch (AS) will open circuit and
the pre-purge light will go off.
XXX If this is the first start and the discharge air sensor is warm but the O/A is cool, then the supply fan may not
start for 36 seconds or it may cycle.
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