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
specied AC voltage. The line voltage should be within ±10% of the specied 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.
4. During the overheat condition, the fusible links on the heating elements may open.
When the unit restarts, you may nd that there is no reactivation heat. See the sec-
tion on “Checking the Heating Elements.”
5. The thermistor for the solid-state power controller (TSE1) may be bad. See the sec-
tion on “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-300.
2. The temperature may be too low if you try to operate the HC-300 without any duc-
twork. This can allow too much process air through the unit. See the material on
“Adjusting the Dampers” in the section on “Installation and Start-Up.”
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-
300.
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. Turn the HC-300 on
and allow it to warm up. Check the reactivation outlet temperature – it should still
be low. Close the process damper completely, then wait about 10 minutes for the
temperatures and air volumes in the HC-300 to stabilize. Check the reactivation
temperature again. It should be quite a bit higher than 120°F. Now open the damper
a bit, wait another 10 minutes, and check the outlet temperature again. Keep doing
this until you nd the process damper setting which causes the reactivation outlet
temperature to drop to 120°F. This is the correct setting for the process damper.
5. One of the heating elements may have stopped working. See the section on
“Checking the Heating Elements.”
6. A low outlet temperature can also be caused by a problem with the reactivation
blower. Turn off the HC-300 and try to spin the blower by hand. It should turn freely.
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