Shellab SVAC4-2 - Manual (Page 16)

16
4/ Controller set too low –be sure that it is more than 5 degrees over desired
set point; check if Over Temperature light is on continuously; turn controller
knob completely clockwise to see if problem solved then follow instructions in
section 6.6 for correct setting.
5/ electrical noise
–remove nearby sources of RFI including motors, arcing
relays or radio transmitters.
Will not maintain set point
1/ assure that set point is at least 5 degrees over ambient room temperature
2/ see if ambient room temperature is fluctuating
Display and Reference thermometer
don’t match
1/ calibration error-recalibrate.
2/ Main temperature sensor failure
–evaluate if Heating light is operating
correctly
3/ Main controller failure
–evaluate if Heating light is operating correctly
4/ allow at least two hours to stabilize
5/ verify that reference thermometer is certified
Can't adjust set points or calibration
1/ turn entire unit off and on to reset
2/ if repeatedly happens-call Customer Service
Calibrated at one temperature, but
not at another
This can be a normal condition when operating temperature varies widely. For
maximum accuracy, calibration should be done as close to the set point
temperature as possible.
MECHANICAL
Glass door not sealing
Check physical condition of gasket-replace if worn.
Outer door not sealing
1/ see if hinges are out of adjustment
2/ Confirm that unit has not been damaged and body out of square.
Oven won’t hold vacuum
1/ check door gasket for damage, wear or lack of compliance
2/ assure all vent and feed valves are closed tightly
3/ assure tight connections to pump
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
Wall fuse/circuit breaker is blown
1/ check wall power source
2/ 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., heater, and just controller is off
4/ check all wiring connections, esp. around the on/off switch.
Unit is smoking –Out of box
This is common during initial operation. Put unit under vent and run at full
power for two hours.
Contamination in chamber
1/ see cleaning procedure in operator’s manual
2/ develop and follow standard operating procedure for specific application;
include definition of cleaning technique and maintenance schedule
SERVICE
If this product should require service, contact Customer Service (800) 322-4897 or [email protected] . If return of the
product is necessary, an authorization number must be obtained and the product shipped according to your
representative, to the proper service center. To insure prompt handling, the return authorization number should be
placed on the outside of the package or container. Make sure a detailed explanation of the reason for return is
enclosed with the item.