15 Options
15
56
Rittal Liquid Cooling Package
15.6
Low temperature unit
15.6.1
General information
As standard, the condenser unit of the LCP DX can be
operated at outdoor temperatures as low as -20 °C. If
this minimum temperature is undershot (minimum tem-
perature -40 °C), the optional low temperature unit must
be deployed.
The low temperature unit consists of the winter kit mod-
ule and a special condenser unit suitable to work till -
40 °C that replaces the 3311.363 standard condenser.
The winter kit module consists of a metal box that can
also be installed outdoors. The following components
are installed in this metal box:
– a liquid receiver
– a speed control for the condenser fans
– a small heater with the associated thermostat to pre-
vent excessively low temperatures in the winter kit
module, and
– a non-return valve loose, to be installed in the refriger-
ant discharge line
The condenser is equipped with special fan motors for
deployment at temperatures as low as -40 °C as well as
two refrigerant valves that channel off the refrigerant for
inadequate pressure in the condenser beforehand.
15.6.2
Installation
The winter kit module can be installed near the condens-
er and connected with copper pipes, diameter
d=12 mm, 1 mm thick. The winter kit module must be
fastened to the base with the supplied fastening material
in accordance with the installation diagram.
Fasten the winter kit module to the base of the instal-
lation location with the supplied fastening material.
Connect the winter kit module, the condenser and the
supplied non-return valve in accordance with the re-
frigerant scheme (see fig. 67).
Fill the LCP DX with refrigerant (see section 6.2 "Notes
on pipework").
15.7
High temperature condenser
15.7.1
General information
As standard, the condenser unit of the LCP DX can be
operated at outdoor temperatures as high as +45 °C. If
this maximum temperature is overshot (to maximum
+53 °C), the optional high temperature condenser that
replaces the 3311.363 standard unit must be deployed.
For the above-mentioned maximum temperature, the
maximum cooling capacity with the optional condenser
is 7.55 kW.
15.7.2
Installation prerequisites
Note the larger dimensions of the high temperature con-
denser compared with the 3311.363 standard unit
(fig. 62).
15.8
Air filter
15.8.1
General information
When the LCP DX is deployed in the "Room" or "Row"
operating modes (Inline configuration), it can be
equipped with an air filter of the class G3 that prevents
contamination, in particular for the evaporator, such as
by dust in the air flow.
In addition to the air filter, installed in the rear door, a dif-
ferential pressure sensor measures the pressure loss
through the filter. If this value exceeds the specified
threshold, an appropriate warning will be issued. The fil-
ter should then be cleaned.
Because the LCP DX can operate with air flows of differ-
ent strengths, different pressure losses at the filter can
result. Therefore, the above-mentioned threshold for the
warning message for the associated installation of the
LCP DX must be customised accordingly. Otherwise, no
warning message will ever be issued for a threshold that
is too high, conversely, warning messages will be issued
continually for a threshold that is too low.
The following table provides a guide for appropriate set-
ting values.
15.8.2
Setting the threshold
Set the threshold appropriate for the air flow directly at
the adjustment screw of the differential pressure sen-
sor (see Table 30).
Note:
When this option is used, the filling volume of
the refrigerant increases to 4.8 kg (rather
than 2.8 kg).
Note:
When this option is used, the filling volume of
the refrigerant decreases to 2.65 kg (rather
than 2.8 kg).
Fan speed
Setting value
30%
20 Pa
50%
60 Pa
75%
100 Pa
100%
180 Pa
Tab. 30:
Assignment of the fan speed to the setting value
