MRC 1425, Инструкция по эксплуатации, Страница: 15 / 21

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3/ check calibration – using independent thermometer,
follow instructions in section 6.5
Unit will not heat up at all
1/ verify that controller is asking for heat by looking for
Heating light – if pilot light is not on continuously during
initial start up, there is a problem with the controller
2/ check amperage – amperage should be virtually at
maximum rated (data plate) amperage
3/ do all controller functions work?
4/ is the Controller set high enough? – for diagnostics,
should be fully clockwise with the Over Temperature light
never on
5/ has the fuse blown? Check fuse at inlet.
6/ Units will need at least some vacuum in chamber to keep
unit air tight - verify with Vacuum Gauge is above “0”
Indicated chamber temperature
unstable
1/ ± 1. may be normal
2/ is ambient room temperature radically changing – either
door opening or room airflow from heaters or air
conditioning ? – stabilize ambient conditions
3/ sensor miss-located, damaged or wires may be
damaged - check mounts for Main and Controller sensors,
then trace wires or tubing between sensors and controls
4/ calibration sensitivity – call Customer Service
5/ 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
6/ electrical noise – remove nearby sources of RFI
including motors, arcing relays or radio transmitters
7/ bad connection on temperature sensor or faulty sensor –
check connectors for continuity and mechanical soundness
while watching display for erratic behavior; check sensor
and wiring for mechanical damage
8/ bad connections or faulty solid state relay – check
connectors for mechanical soundness and look for corrosion
around terminals or signs of arcing or other visible
deterioration
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 – see section 6.6
2/ Main temperature sensor failure – evaluate if Heating
light is operating correctly
3/ Main controller failure – evaluate if Heating light is