Grain Systems PNEG-297 - Manual (Page 21)

PNEG-297 Chi-Town Heater 21
11. Time Delay Operation
Time Delay Reset (HH-1089E) Operation
The electronic time delay will indicate the operating condition of the heater through the LED light shown
in
Figure 11A . This light should be on the exterior control panel of the heater when the unit is installed
correctly. This light is very helpful in identifying the status of the flame probe (open or closed) and will
indicate a lock out condition.
Start-Up
The light should be ON when the ON/OFF switch is set to ON. This indicates that the heater has power
and the flame probe is closed. The gas solenoid should open and ignitor should spark. The light will remain
on until the flame probe opens. The light should go OFF if flame is established within the 30 second trial
for ignition.
If flame is not present or the probe does not open, then the light will blink continuously after the 30 second
time period. It will blink continuously until the heater is reset.
Turn power OFF for 10 second to reset a lock out condition. The light will stop blinking after the 10 second
time period. The heater cannot be restarted if the light is blinking continuously.
Thermostat Cycle
The heater thermostat will cycle the gas solenoid OFF when temperature is reached. The flame probe
should cool to a closed condition when this occurs. The thermostat will also cool to a closed condition with
a drop in plenum temperature. The thermostat closure is a call for heat and the normal start-up for the
time delay begins again.
A condition can occur where the thermostat can call for heat before the flame probe cools to a closed
condition. The light ON the time delay will flash once at thermostat closure and remain OFF until the flame
probe closes again. The heater will not operate until this “closed” condition of both switches is achieved.
Figure 11A Flame Probe Light ON Time Delay
Light Status Indication
ON
Flame probe is closed.
Time delay in 30 second trial for
ignition period.
OFF
Normal operation with flame present.
Flame probe open. Thermostat closed.
Normal operation with no flame present.
Flame probe open. Thermostat open.
BLINKING
Lock out: Flame probe closed after
30 second.
To reset: Turn power OFF. Wait
10 second. Turn power ON.