5–2
1. The Fault light is triggered when the heating elements overheat. There can be
several possible causes. Begin by checking for a blockage in the reactivation air
stream. Once the unit cools down, you may be able to reset it by turning the Auto/
Off/Manual switch to Off, then back to Auto or Manual. You should still check the
installation carefully for any possible problems.
2. The heating elements may also overheat if the AC line voltage rises much above the
specified AC voltage. The line voltage should be within ±10% of the specified
voltage.
3. If the reactivation blower is overloaded, it will stop automatically. This may cause
the heater to overheat, and trip the Fault light. Once the motor has cooled, it should
restart automatically.
During the overheat condition, the fusible links on the heating elements may open.
When the unit restarts, you may find that there is no reactivation heat. See the
section on “Checking the Heating Elements.”
4. Model HC-150I only – The thermistor for the solid-state power controller (TSE1) may
be bad. See section 5.8, Checking the Thermistor.
5.4 REACTIVATION OUTLET TEMPERATURE IS TOO LOW
1. The air at the outlet for the reactivation air should be about 120°F, ±5°. This mea-
surement gives you a way of making a quick check of the overall operation of the
HC-150.
2. The temperature may be too low if you try to operate the HC-150 without any
ductwork. This can allow too much process air through the unit. Install a damper
downstream of the process outlet. See section 3.6, Adjusting the Dampers.
3. If the unit is overloaded, and is trying to remove too much moisture, the temperature
at the outlet will drop below 120°. (You can think of the excess moisture as “cooling
off” the stream of heated air.) Is there some reason why the air in the system has
suddenly become much more humid? This change could be overloading the HC-150.
4. You can see a similar problem if the unit is trying to handle too much of the damp air
at once. The volume of process air (the “process volume”) may be too great.
Change the volume of process air by adjusting the damper. Set the position of the
process damper to produce a temperature at the reactivation outlet of 120°F (±5°).
If the temperature at the reactivation outlet is less than this, the volume of the
process air must be reduced. (Notice that you’re changing the position of the
process
damper to affect the temperature at the
reactivation
air outlet.) Close the
process damper completely. Wait ten minutes for the temperatures in the machine
to stabilize.
5. Check the temperature at the reactivation outlet again. The temperature should now
be at least 120°F.
6. Open the process damper a bit. Wait ten minutes before checking the reactivation
outlet temperature again. If it is still above 120°F, open the process damper and
wait again. Continue doing this until you find the setting which causes the reactivation
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