Herrtronic
®
RDU-D Supplement
I n s t a l l a t i o n , O p e r a t i o n , & M a i n t e n a n c e M a n u a l
8
www.herrmidifier-hvac.com
VII. TROUBLESHOOTING
Problem/Symptom
Reason / Correction
Steam Condensing on RDU sheetmetal or other objects.
1. Adjust louvers per figure 12
2. Fan not running. Check pressure switch for fail closed
condition. Herrtronic unit should not operate if fan is not
running.
3. Too little airflow. Increase fan speed.
4. Room is very cold, very humid, or objects are cold.
Decrease humidity setpoint at Herrtronic unit or humidity
controller.
Fan not energizing
1. Check that the fan rotates freely.
2. Check fuses in RDU.
3. Check wiring to fan.
4. Check voltage to fan - should be 220 VAC +/- 10%.
5. Replace fan and capacitor.
Fan speed adjustment not working.
1. Replace rheostat.
Water spitting out of manifold
1. Check condensate drain hose. If it is clogged, clean.
2. Make sure condensate drain hose is sloped properly
and there are no low spots or kinks.
Fan does not continue to operate for 15 minutes after
Herrtronic unit shuts down.
1. Check wiring to relay/timer.
2. Check that the 24 VAC is present between terminal #2
and #3 on relay timer. If so, replace timer.
Air pressure switch not closing.
1. Fan speed setting too low. Increase fan speed.
2. Check tubing on switch for clogging or out of position.
3. Faulty air pressure switch. Replace.
Blown fuses in RDU
1. Check fan for short circuit.
2. Check RDU wiring for short circuit.
