Shellab SRI20-2 - Manual (Page 10)

10
TROUBLESHOOTING and SERVICE
When troubleshooting, always make a visual inspection of the incubator and control
console to find loose or disconnected wires which may be source of the trouble. In the
event the incubator does not operate properly, check the following before calling for
service.
TEMPERATURE
Temperature too high
1/ controller set too high-see section 5.5
2/ controller failed on
– call Customer Service
3/ wiring error – call Customer Service
Display reads "HI" or "400"+
probe is unplugged, is broken or wire to sensor is broken – trace wire
from display to probe; move wire and watch display to see intermittent
problems
Chamber temp spikes over set point and
then settles to set point
Recalibrate – see Section 5.6
Temperature too low
1/ Overtemperature set too low – see section 5.7
2/ controller set too low – see section 5.5
3/ unit not recovered from door opening – wait for display to stop
changing.
4/ unit not recovered from power failure or being turned off
– incubators
will need 24 hours to warm up and stabilize.
5/ element failure
– see if heating light is on; compare current draw to
data plate.
6/ controller failure
– confirm with front panel lights that controller is
calling for heat.
7/ Overtemperature Thermostat failure
– confirm with front panel lights
that thermostat is operating correctly.
8/ wiring problem
– check all functions and compare wiring to schematic
in section 8.0 - especially around any areas recently worked on.
9/
LOOSE CONNECTION
–
CHECK SHADOW BOX FOR LOOSE CONNECTIONS .
Display reads "LO"
1/ sensor is plugged in backwards – reverse sensor wires to controller
2/ if ambient temperature is lower than range of unit – compare set points
and ambient temperature to rated specifications in section 8, Unit
Specifications.
Unit will not heat over a temperature that
is below set point
1/ confirm that fan is moving and that amperage and voltage match data
plate
– check fan motor motion in shadow box and feel for air movement
in chamber
2/ confirm that set point is set high enough
–turn Thermostat all the way
clockwise and see if HEATING light or OVER TEMP light comes on
3/ check connections to sensor
4/ check calibration
– using independent certified thermometer, follow
instructions in section 5.6
Section
7