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No heat from heater
If the Heater Module is not generating heat and the yellow "heat" light does not flash,
check the following settings:
1. The heater set point is large (70
2. The measured temperature displayed on the PC is less than the set point
3. The heater window has "on/off with PWM max heat" checked
4. The max heat value is large (100%).
Then check to see if there is a red light in the Heater Control fiber optic connection on
the ERT Control/Gating Module. If the above are all true, and there is no red light, the
problem must be a communication problem between the PC and ERT Control/Gating
Module. The problem has nothing to do with the Heater Module. It is confined to the
PC, the ERT Control/Gating Module and the cable between the two units.
If there is a red light then check the following:
1. Power is applied to the Heater Module. If the green light is not on, check the
switch and/or internal fuse.
2. Red light is present on the fiber optic cable connected to heater control.
3. The heater control fiber is seated in the connector (should snap in place).
4. Check inside the fiber optic connector for lint.
If still the yellow light does not flash, contact SAII's Customer Service.
Low heat from heater
If the yellow heat LED is flashing, but the temperature from the Heater Module is low,
follow these instructions.
Using the 1.5 m tube from the Heater Module and the 7 m tube between the Fan and
Heater, the temperature at the end (or just inside the end) of the outlet of the 1.5 m tube
o
should be 55
C. The ERT module can be used to measure the temperature.
You can pretty well tell what the control electronics in the Heater Module is doing by
observation of the yellow heat LED. When the system is first turned on and with the
Fan Module off (with set point very high and duty cycle to 100%) The yellow LED should
flash continuously until the temperature just inside of the heater (inside the hole labeled
Warm Air) rises to a standby level of about 40
standby level, the yellow LED should only flash occasionally to maintain that
temperature.
When the fan is turned on, the processor senses a difference in
temperature between the thermisters located at the inlet and outlet of the Heater
Module.
In this case the processor allows the outlet temperature to rise to
o
approximately 85
C correspondingly the temperature at the end of the 1.5 m tube is
o
about 55
C. When that temperature is reached the yellow LED will flash only when
current is required to maintain the temperature.
Look inside the holes of the Heater Module. You will see a thermister at each end. The
thermisters should stand erect and not be bent against the heat chamber. If the Heater
o
C)
o
C. Once the temperature reaches the
Revision C, August 2013
Troubleshooting
C-5
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