MANUALP/4000_SERVICE_0712 July2012
14
POWER CONTROL AND HI-LIMIT PANEL (RIGHT HAND SIDE)
The Power Control and Hi-Limit Panel is fitted at the top right hand side of the
enclosure. This panel contains the ON/OFF Switch, FUSE and user adjustable
Temperature HI-LIMIT thermostat.
1 CO
2
SAMPLE PORT
This fitting allows the user to SAMPLE the atmosphere inside the cabinet.
The fitting cover MUST be fitted after sampling to minimise CO
2
loss.
Note: A sample should NOT be taken within 5 seconds of the CO
2
INJECT LED coming on.
2 TEMPERATURE HI-LIMIT THERMOSTAT
This is a mechanical thermostat which directly monitors the temperature
of the enclosure. If the temperature exceeds this setting the power to the
element will be switched off and the associated Hi-Limit (3) neon will
illuminate when the controller applies power to the element. This can be
observed by watching the HEAT LED on the front panel. This thermostat
should be set to operate just above the set point temperature. See
Setting Hi-Limit Thermostat below.
3 HI-LIMIT NEON
This RED neon lights whenever the Hi-Limit Thermostat is activated.
Whenever the neon is illuminated no power is being supplied to the
enclosure heating elements (this is an additional safety against
inadvertent enclosure overheating).
4 ON/OFF SWITCH
This turns the power on or off. The fitting also contains an electrical
noise filter.
5 FUSE : The fitting contains a 5AMP fuse.
6 POWER LEAD SOCKET: The power lead plugs into this socket.
7 FRIDGE ON/OFF SWITCH:
If fitted, this turns the fridge on or off. When operating at 37
o
C in an air-
conditioned room, it is recommended to set the ‘FRIDGE Switch’ to OFF.
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