ABATEMENT AQUATRAP AT100S Instruction Manual - page 10
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TROUBLESHOOTING GUIDE – LGR COMMERCIAL DEHUMIDIFIER
Warning: Some instructions contained herein are for use by qualified personnel only.
Troubleshooting may involve fire, shock, explosion, or mechanical injury hazards that can cause
personal injury or death.
SYMPTOM
CAUSE
CHECK / CORRECTION
Restricted airflow through unit.
Check for dirty air filter. Replace as
necessary. Also check for dirty air-to-air-
heat exchanger, evaporator, or
condenser. Clean as necessary.
Air is very dry.
It is normal for the unit to initiate defrost
cycles when the air is very dry because
the unit must operate at a very low dew
point to extract moisture.
Unit initiates defrost
cycle when air being
humidified is very warm.
Low Refrigerant Charge
Contact qualified service personnel.
Low voltage.
Voltage should be within nameplate limits.
Blocked Air Outlet.
Check for debris lodged in the air
discharge screen. Clean as necessary.
Outlet Ducting too long or restricted.
Refer to maximum duct length/minimum
diameter and maximum pressure
parameters in the Instruction Manual.
Blower operating intermittently, blower rotating slowly,
or not at all.
There should be a generous volume of air
being discharged through the air outlet. If
not, contact qualified service personnel.
Compressor Short
Cycles
Faulty or incorrect compressor overload.
Contact qualified service personnel.
Unit partially or fully unplugged
Push power plug in fully.
Fuse or circuit breaker tripped.
Replace or reset as necessary.
Defective compressor relay or electronic board.
Contact qualified service personnel.
No power to electronic board.
Contact qualified service personnel.
Kinked or plugged drain hose.
Inspect and correct.
Drain hose connection not fully inserted in drain fitting.
Inspect and correct.
Broken, shorted, loose, or incorrect wiring.
Contact qualified service personnel.
Defective compressor capacitor or external overload
Contact qualified service personnel..
Low voltage or no voltage to compressor.
Voltage should be within nameplate limits.
Compressor windings open.
Contact qualified service personnel.
Compressor Will Not
Run
Seized compressor.
Contact qualified service personnel.
Shorted or incorrect wiring.
Contact qualified service personnel.
Shorted capacitor.
Contact qualified service personnel.
Compressor short cycling.
See “Compressor Short Cycles”
Fuse or breaker setting too low.
Check nameplate fuse size.
Broken, shorted, loose, wiring, or miswired.
Contact qualified service personnel.
Low voltage or no voltage.
Voltage should be within nameplate limits.
Seized or seizing compressor.
Contact qualified service personnel.
Unit Trips Fuse / Circuit
Breaker
Defective fan relay.
Contact qualified service personnel.
Defective compressor.
Contact qualified service personnel.
Overcharged refrigerant quantity.
Contact qualified service personnel.
Refrigerant lines contacting each other, or other parts
Contact qualified service personnel.
Loose impeller or loose compressor mounts.
Contact qualified service personnel.
Unit Rattles or is Noisy
Humming reversing valve solenoid.
Contact qualified service personnel.
Air is too dry to remove any more water
Move unit or ducting to an alternate
location or increase the evaporation rate
out of the building materials using fans.
Low refrigerant charge
Contact qualified service personnel.
Excessive refrigerant charge
Contact qualified service personnel.
Male hose fitting not fully inserted in Female fitting
receptacle.
Fully insert to ensure internal shut-off
valve opens.
Drain pan hose not inserted into pump reservoir.
Re-insert hose as far into pump reservoir
as possible.
Compressor and
Motorized Impeller run,
but there is no water
being pumped from unit
Reversing valve stuck in defrost position
Contact qualified service personnel.
Refrigeration tubing insulation is missing, or damaged.
Contact qualified service personnel.
Water Drips from Unit
AT100S unit was not manually purged prior to
relocating.
Leave unit plugged in for 15 minutes after
final shut-down. After 15 minutes (or
more) press PURGE button to drain pump
reservoir completely before moving unit.
*This troubleshooting guide is intended for use by qualified service personnel.