Dectron, Inc. March 2012
DECTRON
DSH/DSV/RSH/DBH/RBH Series Dehumidifier Owner’s Manual
Data subject to change without notice.
304
Service Diagnostics - Mechanical
Problems not indicated by Supervisaire
®
Controller
SYMPTOM POSSIBLE CAUSES CHECKS & CORRECTIONS
Unit not cooling
(continued)
Wrongly adjusted head pressure
bypass valve (ORI-6 5/8)
(continued)
Compressor will
not start
No demand
• Adjust the set points to the values on the
unit nameplate.
Anti-short-cycle timer prevents
startup for 3 minutes.
Wait.
Compressor overload is turned
off or has tripped (three-phase
units only)
• Turn the overload on (where so equipped).
Compressor thermal protector is
open
• Allow one hour for compressor to cool.
Open water-pressure switch
circuit
• Check circuit continuity. Check for water
flow. Check pressure switch adjustment.
Loose control or power wiring
• Check for electrical continuity under load.
Water exit temperature above
120°F
• Check the water flow rate.
• Clear the fault code.
Closed isolation valves for
outdoor condenser
Check position of ball valves.
• Open valves.
Defective relay on S5 relay board
Check whether the A/C three-way valve is
energized.
• Replace defective relay.
Room load exceeds the cooling
capacity of the unit
Check the air temperature differential through
the DRY-O-TRON®.
• If the differential is 8°F - 10°F (4.5°C - 5.5°C)
the unit is cooling properly.
Check controller
status messages.
4. To adjust this valve, close it
completely and then open it one
turn.
• Replace defective valve.
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