Instructions - Rittal

6 Commissioning
The recooling unit does not have its own main
switch to switch the recooling unit on and off. It must
be switched on and off by the higher-level controller.
6.1 Antifreeze
As standard, the units are not suitable for operation
below the specified minimum temperature (see
chapter 11). The units are always to be used with a
water-glycol mixture for the coolant with a maximum
glycol content of between 20 and 30% by volume.
The recommended antifreeze is Antifrogen N or our
Rittal Rifrost.
Other types of antifreeze are possible in specific
cases, however only in consultation with the manufacturer.
Note!
Only use distilled or de-ionised water in
recooling units specified for such use (see
chapter 11).
Caution!
Risk of damage for pipes and seals!
Other additives may damage the pipes
and the seal on the cooling medium
pump and are therefore not allowed.
To prevent problems in the cooling medium circuit
(also water-cooled units), it is imperative that the
VEB Cooling Medium Guidelines (VGB-R 455 P) are
observed.
You can read and determine the correct glycol content
with the aid of a refractometer, available from
the following supplier: Georg Pforr -gefo- GmbH &
Co. KG, Holterkamp 16, D-40880 Ratingen, Germany.
http://www.gefo.de.
6.2 Filling the recooling system with
cooling medium
The composition of the cooling medium is described
in chapter 8.
For commissioning, proceed as follows:
Ensure that any shut-off valves installed in the cooling
medium circuit are open.
1
6 Commissioning
Fig. 25 3318.610 and 3319.610 Filling with the cooling
medium
For types 3318.610 and 3319.610:
Fill the unit with cooling medium via the fill nozzle
(1) (see Fig. 25) up to the full mark in the tank.
For types 3320.6xx and 3334.6xx:
Fill the unit with cooling medium via the fill nozzle
(4) (see Fig. 4). Check the level on the level gauge
(3) (see Fig. 3).
For types 3318.600 and 3319.600:
For pressure-sealed cooling medium circuits: Fill the
circuit using a filler pump or water hose via the feed,
return or drain cock (Fig. 2), and build up a prepressure
of 1.2 – 2 bar. This pressure can be read
from the pressure manometer you have fitted.
For types 3318.6xx, 3319.6xx, 3320.6xx and
3334.6xx:
Switch on the power supply to the recooling unit via
the higher-level controller.
The indicators on the controller illuminate and indicate
the actual feed temperature of the cooling medium.
Check the direction of rotation of the motors (see
direction of rotation arrows on the cooling medium
pump and on the condenser fan).
Note!
If the compressor and condenser fan do
not start to operate, the temperature of the
cooling medium added is lower than the
setpoint temperature set.
If necessary, lower the setpoint temperature momentarily;
see section 7.4.
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EN