Instructions - Rittal

3.1.2 Safety devices
The recooling unit has a pressure switch in accordance
with EN 12263, tested at component level, in
the refrigerant circuit; this device is set to the maximum
permissible pressure (PS). An automatic reset
device ensures that the system continues to work
after the pressure drops (autoreset).
Temperature monitoring prevents the evaporator
coil from icing over. If there is a risk of icing, the
compressor switches itself off and automatically
switches itself back on again at higher temperatures.
The refrigerant compressor motor and the fan motors
are equipped with thermal winding protection
switches against excess current and excess temperatures.
To ensure that the compressor runs reliably and
without problems (for example after reaching the
setpoint temperature or after a fault), the compressor
automatically switches back on after a delay of
180 seconds.
The recooling unit has two integrated floating fault
signal contacts (see circuit diagram of the relevant
unit type, sections 13.4 and 13.5). Individual fault
messages can be interrogated via an integrated
Sub-D socket using an external PLC controller.
3.1.3 Filter mats
If there is coarse dust and fluff in the ambient air, we
recommend fitting an additional filter mat (available
as an accessory) in the recooling unit (provision has
been made for installation). You will need to replace
the filter regularly depending on the amount of dust.
For air that contains an oil mist, we recommend
metal filter mats (accessory). These may be cleaned
with suitable detergents and reused.
Automatic filter mat monitoring is built into recooling
units (turned off by default). The device measures
the dirt in the filter mat by comparing the ambient
temperature and the air output temperature on the
condenser. As the filter mat becomes increasingly
dirty, the pressure in the refrigerant circuit rises and
with it the temperature of the output air. This results
eventually in a fault message.
3 Device description
3.2 Proper use
Rittal recooling units have been developed and designed
in accordance with the state of the art and
the recognised rules governing safety. Nevertheless,
if used improperly, they may pose a threat to
life and limb or cause damage to property.
The TopTherm recooling units described in these
instructions must only be used for cooling water or a
water-glycol mixture.
If using other fluids (e.g. de-ionised water), please
refer to the technical specifications contained in the
appendix, or contact the manufacturer. Under no
circumstances should the limit values specified in
the technical specifications be exceeded.
Explosion hazard!
The use of the recooling unit for cooling
inflammable or explosive substances is
prohibited.
3.3 Supply includes
The unit is supplied in packaging in a fully assembled
state.
Please check the scope of supply for completeness.
Check the packaging carefully for signs of damage.
Traces of oil on damaged packaging indicate a loss
of refrigerant. The unit may have leaked. Any packaging
damage may be the cause of a subsequent
functional failure.
Qty. Description
1 Recooling unit
1 Dispatch bag with:
1 – Operating and installation instructions
1 – Eyebolt for transportation
Tab. 1 Supply includes
Page 8 of 61
EN