Grant Instruments RC - Manual (Page 8)

Recirculating Chiller
Part No 09931/Issue 8 Page 8 August 2001
2.6
Remote Alarm Socket
This alarm is operative whenever the liquid temperature goes outside the user-setable bands
around the set point. The factory setting for these alarms is 10
°C above and below the set point;
to alter the setting, refer to section 3.3. During the initial heat up or cool down phase, or
whenever the set temperature is changed, the alarm is disabled. The alarm is also operated by
the flow fail and a separate overtemperature cutout that operates when the equipment has gone
outside its upper range. The alarm relay contacts are connected to a three pin Alarm output
socket on the rear of the unit, for the attachment of an external alarm device - a light or buzzer for
example. The contact ratings are 2A at 240V
Connect the external alarm socket pins as follows:
Pin1 Ground
Pin 2 Output
Pin 3 Output
2.7 Remote
Probe
Plug remote probe into socket on rear panel, if required.
Place remote probe in liquid which is to be temperature controlled. Clamp in position so that it
cannot be accidentally pulled out of liquid.
3 Operation
Grant
flow fail cooler
Alarm override on water / glycol power
¦ ¦ ¦ ¦
off water
Figure 3
Power switch
Water / glycol switch
Cooler on / off switch
Flow fail override switch
General alarm light
Switch to water if water is being used.
Switch to water / glycol if water /
glycol is being used
Press to turn on cooler
Press for five seconds after switching on the
main power switch or to restart after flow fail
Lights during alarm state
Not applicable for RC3000G
Controller (see fig 4)