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6-6 l Troubleshooting
Shut Down Alarms
Problem
A4 Regen Heater High
Temperature – The snap switch
in the regeneration heater tube
activated due to excessive tem-
perature.
A5 Carousel Index Too Long
Alarm – If the carousel index
was more than 1.5 times the
normal index time, it shuts
down the dryer.
A6 Carousel Index Failure –
If the carousel index is
requested but no contact transi-
tion from on to off is seen
within 5 sec, it shuts down
dryer.
A7 Return Air High
Temperature – If the return air
temperature at the inlet to the
blower is greater than 180°F
(82.2°C), it shuts down the
dryer.
Possible cause
The regeneration exhaust is blocked or
the air hoses are loose.
The isolation contactor failed in the
closed position.
The heater solid state relays (SSRs)
failed.
The limit switch is not adjusted
correctly.
The limit switch is not adjusted
correctly.
The bed drive motor is damaged.
The set screw on the bed drive motor
shaft plate is loose.
The bed drive motor relay has failed.
The hopper does not contain enough
material.
You are drying at a high drying temp
(above 250°F [121.1°C]) or you are run-
ning at low throughputs.
If an optional aftercooler is installed, it
does not have enough water.
The aftercooler coils are dirty.
Solution
Check that the bed plates are in the
proper position (lined up with the
hoses). See “Adjusting the limit switch”.
Tighten any loose hoses.
Replace the isolation contactor.
Replace the failed heater solid state
relays (SSRs).
Adjust the limit switch so that it drops
into the groove and stops the bed plates.
See “Adjusting the limit switch”.
Adjust the limit switch so that it drops
into the groove and stops the bed plates.
Replace the bed drive motor.
Tighten the set screw. Make sure it is on
the flat of the D shaped shaft.
Replace the bed drive motor relay.
Make sure your material supply system
is working properly.
Add an optional aftercooler, if one is not
currently installed.
Turn on the water supply, or fix any
leaks or blockages.
Clean the aftercooler coils. See
“Cleaning the Aftercooler”.