Use and Care Manual

TROUBLESHOOTING GUIDE – LGR COMMERCIAL DEHUMIDIFIER
WARNING: Some diagnostics contained herein are for the guidance of qualified service personnel
only. Improper troubleshooting or servicing could result in fire, shock, explosion, or mechanical
injury hazards that can cause personal injury or death.
SYMPTOM
POSSIBLE CAUSE
CHECK / CORRECTION
Unit not extracting water
at expected rate
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.
Low voltage.
Voltage should be within nameplate limits.
Air is very dry.
Test humidity. Unit will not extract moisture
from air below 30 grains.
Low Refrigerant Charge
Contact qualified service personnel.
Compressor Short
Cy cles
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.
Reduce duct length or increase duct
diameter to ensure pressure at the outlet,
external to the unit, does not exceed 0.15”
water column external static pressure.
Blower operating intermittently, blower rotating slowly,
or not at all.
Insure a generous volume of air is
being discharged through the air outlet. If
not, contact qualified service personnel.
Faulty or incorrect compressor overload.
Contact qualified service personnel.
Compressor Will Not
Run
Unit partially or fully unplugged
Push power plug in fully.
Fuse or circuit breaker tripped.
Replace or reset as necessary.
Defective compressor relay
Contact qualified service personnel.
No power to control panel.
Contact qualified service personnel.
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.
Seized compressor.
Contact qualified service personnel.
Unit Trips Fuse / Circuit
Breaker
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, or improper wiring.
Contact qualified service personnel.
Low voltage or no voltage.
Voltage should be within nameplate limits.
Seized or seizing compressor.
Contact qualified service personnel.
Defective fan relay.
Contact qualified service personnel.
Unit Rattles or is
Excessively Noisy
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.
Humming reversing valve solenoid.
Contact qualified service personnel.
Compressor and
Motorized Impeller run,
but there is no w a ter
being pumped from unit
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.
Drain Valve is open
Ensure that valve is shut. The red ring
should be visible. See STORAGE Section.
Drain pan hose not inserted into pump reservoir.
Re-insert hose as far into pump reservoir
as possible.
Reversing valve stuck in defrost position
Contact qualified service personnel.
Water Drips from Unit
Refrigeration tubing insulation is missing, or damaged.
Contact qualified service personnel.
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.