SD Carel USA
27
WATER IN THE CYLINDER TURNS BLACK:
Causes:
1. This is usually an indication that the minerals in the cylinder have overconcentrated and the pH of the water
has dropped causing a deterioration of the electrodes. Left unchecked, this will lead to a very short cylinder
life.
Remedies:
1. Check for sags & kinks that could trap condensate in the steam hoses that could cause a back pressure on
the cylinder.
2. Check the duct static pressure.
3. Check the fill valve and inlet strainer.
4. Check the drain valve operation.
5. Correct installation problems and replace cylinder.
HEAVY ARCING OCCURS WITHIN HOURS OF STARTUP:
Causes:
1. The feed water contains large amounts of Iron, Copper or other conductive contaminants.
Remedies:
1. Contact the factory for an optional drain timer to force additional drains to control the minerals.
2. If you are using a softener, check the salt being used. If it contains any additives, discontinue use, flush all
lines and convert to pure salt or unsoftened water.
3. Check the electrodes in the cylinder to be sure they were not damaged in shipping.
NO POWER TO CONTROLLER: as tested between wires 68 & 69 on back of controller
Causes:
1. Connectors on back of controller are loose.
2. Remote On/Off contact (terminals 20-21) is open.
3. Transformer is defective.
4. Unit On/Off switch is OFF.
5. Fuses are blown.
Remedies:
1. Push connectors back in tight and check that all wires are properly inserted and making contact.
2. Place a jumper across field wiring terminals 20-21. If unit starts, check any devices (hi-limit, air flow switch)
wired to these terminals to make sure their contacts are closed.
3. Check for proper primary voltage and taps on primary side of transformer. Check output from transformer
secondary. If lower than 24 Vac, retap transformer. Check fuses on transformer.
4. Turn On/Off switch to ON position.
5. Check the F1, F2, F3 fuses and any external disconnects.
ALL THE LEDS ON THE CONTROLLER ARE LIT, BUT THERE IS NO LCD DISPLAY:
Causes:
1. Low secondary power (under 20 Vac).
2. Fuse is blown.
3. Transformer is defective.
4. Short in wiring to humidistat or sensor.
5. Improper voltage supplied to the unit.
Remedies:
1. Check for proper primary voltage and taps on primary side of transformer. Check output from transformer
secondary. If lower than 24 Vac, retap transformer. Check fuses on transformer.
2. Replace blown fuses.
3. Replace defective transformer.
4. Check for proper wiring to humidistat or sensor. Check for skinned or grounded wires or shorts.
HUMIDIFIER HAS POWER AND DISPLAY BUT WILL NOT START:
Causes:
1. The external signal (CDP) or humidistat is not correct.
2. External devices are incorrectly wired.
3. DIP switch settings on back of controller are wrong.
4. Set point (CDH-CDD) is below the actual reading.
Remedies:
1-4. Check against the installation instructions. Check external devices.
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