Grant Instruments LTC2 - Manual (Page 12)

30933 V2 LTC2
Page 11 Operating Manual
www.grantinstruments.com
5.2.3 Product description, refrigeration unit front panel (grille removed)
The refrigation unit has a resetable over temperature protection which protects the unit
from overheating. This will be actuated when the working fluid temperature is between
110°C and 120°C. The unit can be reset by waiting for the liquid to cool below 100°C,
then unscrewing the black cap and pushing in the revealed button. Note, this protection
is in addition and separate from the over temperature protection on the control unit.
The freezing protection switch uses a low temperature thermostat to ensure the working
fluid never drops below 5°C. With the switch in the depressed/in position the cooling will
be switched off by a low temperature protecting thermostat. If water is used in the bath
this will prevent it from freezing. In the out/off position the thermostat is bypassed
allowing the unit to run at temperatures below 5°C.
The drain port and insert allow convenient emptying of the refrigeration bath. To drain
the unit first remove the drain insert from the holder and connect a suitable length of
hosing with a bore of 12.7mm (½’') to the drain insert. Have the non connected end of
tubing in a receptacle, suitable for the liquid to be drained. Push the drain insert into the
drain port and let the liquid drain. To release the drain insert push down the grey button
on the drain body and extract the drain insert. Liquid to be drained should not be below
10°C or above 50°C.
Power switch
Over temperature protection reset
Freezing protection, 5˚C switch
Drain port
Drain insert
Condenser fins