Shellab SHC28R-2 - Manual (Page 14)

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1/ assure that exhaust fan is working
2/ assure that exhaust fan blower casing is free of pooled water
3/ check solid state relay
4/ set point has to be 10 percentage points below reading on control to turn
exhaust fan on
5/ injection valve stuck open
6/ condensate drain tube plugged and pool of water in bottom of chamber
Can't adjust set points or calibration
1/ confirm all wire connections
2/ confirm software revision
3/ call Customer Service
Steam generator not working
1/ check if fill solenoid, injection valve, relief valve, float switch and relays are
working
– see schematic in manual
2/ check for water leaks around steamer
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
REFRIGERATION
SHC10Rs (HC9Rs) & SHC28Rs (HC30Rs) ONLY
Temperature will not reach set point
1/ assure that power is going to heating coils
2/ if the displacement is erratic, see if air is being circulated
3/ confirm that controller is calling for heat (check front panel light)
4/ if light not coming on, check control set point and High Limit set point
5/ confirm that fan is operating and airflow is not blocked
6/ reset by turning unit off and on
Unit won't cool
If the compressor is running:
1/ see if condenser is cold but free of ice
2/ be sure that fan is circulating air in the chamber and over the compressor
3/ confirm proper sensor location and operation
4/ look for leaks in the chamber or around the door gasket
5/ assure ample room around the unit as described in manual
–5cm minimum
6/ adjust calibration on controller
7/ compare ambient specifications to specs in the manual
8/ call customer service
If
compressor isn’t running:
9/ check for non-operating solid state relay
10/ confirm that motor is operable
11/ check if motor has voltage to it
12/ see if refrigeration is running too hot and thermal cutoff activated:
a- dirty coil or poor circulation
b- coil next to heat source
c- ambient temperature too high
Making noise
1/ assure that fan is not miss-aligned
2/ Steady internal clicking may be broken spring or valve
– call Customer
Service
MECHANICAL