Lauda Proline RP 845 C, Operating Instructions Manual

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Proline Edition X cooling thermostats
YACE0100/ October 4, 2018
Unit description
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4. Contact Module (Order No. LRZ 914) with connector to NAMUR NE28. Functionality as
LRZ 915, but only one output and one input on each of two DIN sockets. Coupling socket 3-pole,
LAUDA Order No. EQD 047 and coupling plug 3-pole, LAUDA Order No. EQS 048.
Further details can be found in section 8.5.
5. Profibus Module (Order No. LRZ 917).
Further details can be found in the operating instructions of the Profibus Modules YAAE0020.
6. Pt100-/LiBus-Modul (Order No. LRZ 918).
A Lemo socket (10S) for connecting an external Pt100 temperature probe and a socket (70S) for
connecting components via the Lauda internal bus, LiBus (Command remote control unit, shut
down unit/reverse flow protection, cooling water valve).
Plug: 4-pin Lemosa plug for Pt100 connection, catalog number EQS 022.
4.9 Cooling unit
The refrigerating machine mainly consists of one or two fully hermetically sealed compressors. The
heat from the condensation process and the motor is dissipated via a lamellar condenser. Here, fresh
air is drawn in at the front of the unit, heated towards the back and output at the side. To ensure proper
air circulation the ventilation slots must not be restricted. See Section 6.1.
The coolers of the Proline Series are equipped with the SmartCool technology which makes optimum
use of the compressor and only then cools when refrigerating capacity is demanded by the controller.
To achieve this, a number of sensors in the cooling circuit monitor the operating conditions.
The compressors are equipped with overtemperature cutouts, which respond to the compressor
temperature and the compressor current consumption. In addition, the refrigeration system is backed
up by a pressure control device against over pressure. The cooling unit is normally switched in
automatically, but can be switched manually via the operating menu. (

Section 7.6 with Command
and with Master).
When the fault circuit trips, the cooling unit is also switched off.
Cooling curves (

Section 11).
4.10 Avoidance of dewing
In order to avoid dewing on the edge of the bath when using the low temperature thermostats RP 855,
RP 870, RP 890 and RP 1290, these instruments are equipped with a device for heating the edge of
the bath, using the waste heat of the cooling unit.
As a standard feature, the minimum temperature thermostats RP 890 and RP 1290 are equipped with
an additional electric heating of the bath bridge. This can be ordered as an option for RP 855 and
RP 870.
With the bath covers of the minimum temperature thermostats, RP 890 and RP 1290, it is possible, by
means of a nipple, to let nitrogen or dry air into the bath with a low volume flow.
4.11 Heater rating and power consumption from the mains
The Proline Low-Temperature Thermostats have an extraordinarily high heater rating of 3.5 kW
maximum. If your mains fuse is rated below 16 A, the current consumption can be reduced in steps
from 16 A to 10 A (

7.7.5). The maximum heater rating of 3.5 kW is then, of course, also reduced
accordingly.