Heidolph Rotacool - Manual (Page 8)

8
E
7. Filling the cooling liquid
Only an externally closed system can be connected to the rotary chiller. Shut off the
discharge valve (20) (so that the slit is vertical). Fill the circulation cooler via the filler neck
after removing the cover (1) up to approx. 1 cm below the max. mark on the filling level
indicator (14).
The rotary evaporator cooler is vented by turning on the cooling and pump on the
ROTACOOL with the On/Off button (9). The circulating condenser aerates itself via the built-
in expansion vessel.
The coolant overflow is on the rear of the unit.
During operation of your circulating chiller, the fluid level can fall below
the min. mark on the filling level indicator (14), so that the level switch
responds by switching off the cooling and pump. The warning message
‘H2o’ will flash on the display (6). Refill with cooling liquid.
In order to turn off the ‘H2o’ warning message and return the unit to
normal operation, turn the unit briefly off and on using the main switch
(10).
At temperatures below + 10 °C, the cooling liquid can freeze (see also the
chapter ‘Assembly’, ‘5. Cooling Liquid’). Should the cooling liquid freeze,
the cooling and pump systems will switch off after a certain period during
operation of your circulating chiller
. The warning message ‘H2o’ will flash
on the display (6).
In order to turn off the warning message ‘H2o’ and return the unit to
normal operation, wait until the cooling liquid has thawed. This can take
up to 24 hours. You must also then briefly turn the unit off and on using
the main switch (10).
8. Discharging the cooling liquid
Remove the sealing screw (18) of the discharge socket (19) and slide a tube with an inner
diameter of 8 mm over the discharge socket (19). Secure the tube to prevent inadvertent
slippage. Hold the other end in a collection vessel and open the discharge valve (20) (so that
the slit is horizontal).
Every time before disconnecting the condenser from the rotary evaporator
you must first empty the circulating chiller in the way described if a large-
capacity condenser (e.g. condenser G4) is being used. This is necessary
because the circulating volume is greater in this case than the capacity of
the expansion vessel.
open closed
closed open
(20)
(20)