Shellab SCO26H-2 - Manual (Page 14)

3/ verify that relays are working
4/ verify that float switch is working
5/ confirm that heater is working
a- power to coil
b- is unit burned/shorted out
6/ pressure switch is working
7/ plumbing leak
Humidity unstable
1/ circulating fan failure
a- motor failure or no voltage to motor
b- fan not turning
c- ducts blocked
2/ relative humidity is lower than the unit can achieve at that operating
temperature
3/ chamber leaks
a- motor shaft seals
b- door seal
c- air intake flapper
MECHANICAL
Door not sealing
1/ adjust hinge blocks or twist the door.
2/ Confirm that unit has not been damaged and body is not square.
Motor doesn't move
1/ if shaft spins freely: check connections to motor and check voltage to
motor;
2/ if shaft rubs or is frozen, relieve binding and retest
Motor makes noise
1) Make sure that the fan or blower wheel is not contacting its housing. Adjust
the motor mounting bracket position to re-center the fan or blower wheel, if
necessary.
2) Check the fan or blower wheel for damage or out of balance condition.
Replace the fan or blower wheel if it is damaged or out of balance.
3) Turn the motor shaft to make sure that it spins freely. If it binds or the
bearings make a rubbing or scrapping sound then replace the motor.
Water leaking
1/ If leaking inside: dry chamber, run at temperature with door open. Check
all seams with flashlight including front face.
2/ If leaking outside: dry out and see if leak repeats and find source of leak.
Sources may include: fittings that need tightening, condensation due to
missing insulation or a leak developed in humidity generator.
OTHER
Controller on at all times - "locked-up"
1/ Adjust set point to room temperature. If the light goes out but is still
heating, replace the solid state relay.
2/ turn unit off and on to reset
3/ if cannot change any condition on the front panel, call Customer Service
Front panel displays are all off
1/ Check for wire damage.
Unit or wall fuse/circuit breaker is blown
1/ check wall power source
2/ compare current draw and compare to specs on data plate
3/ see what other loads are on the wall circuit
Unit will not turn on
1/ check wall power source
2/ check fuse/circuit breaker on unit or in wall
3/ see if unit is on, e.g., fan or heater, and just controller is off
4/ check all wiring connections, esp. around the on/off switch
Condensate appears on interior chamber
walls
1/ Some condensation may be normal
2/ Minimize the movement of air around the unit and reduce the number of
door openings
3/ Turn the humidity control counterclockwise until the condensation level is
acceptable
Condensate appears on interior glass door
surface