Shellab SCO12WE-2 - Manual (Page 21)

20
Feeding continuously or abnormally
high CO2 usage
1/ do decay test: if more than 1% decay in an hour, check for leak
: door gasket tightness, motor inlet to chamber, sensor and probe
inlet to chamber
2/ check output signal from controller
3/ check solenoid valve for correct operation
4/ leak in plumbing including between regulator and CO2 tank
5/ door being opened too often
Won’t hold calibration – Fyrite reading
varies but display stable
1/ atmospheric pressure fluctuations
2/ top of unit exposed to cold air drafts
3/ unit being operated without shadow box cover in place
4/ condensation collecting on CO2 sensor
5/ CO2 sensor or interface failure
6/ unit incorrectly calibrated, see section 5.4
7/ taking Fyrite reading too soon after the door has been opened
8/ air leak around CO2 sensor mounting plate
MECHANICAL
Door not sealing
1/ check physical condition of gasket
2/ confirm that door latch pulls door in tightly
3/ assure that gasket is in original location
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.
Solenoid valve buzzing
After removing solenoid clean with alcohol for carbon build-
up then blow out. Check valve seat or channels for
contamination. Check CO2 filter and/or grade of CO2 used. If
seat is worn, replace.
OTHER
Controller on at all times - "locked-up"
1/ turn unit off and on to reset
2/ 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