Expanding The Working Temperature Range With External Cooling - Lauda PROLINE P 5 C Operating Instructions Manual

6.2

Expanding the working temperature range with external cooling

Operation with internal cooling coil

Operation of the LCZ 9662 coolant valve with drinking water
Operation of the cooling liquid valve LCZ 9662 on a central cooling water system
Operation with high-temperature cooler
02/2022
 A different cooling source, for example tap water, can be connected as standard to the
cooling coil.
 Tubing with 10 mm inner diameter must be used.
 The lowest operating temperature of the thermostat without external consumer can be
reduced to a value of 5 °C above the temperature of the cooling liquid.
 In combination with the cooling liquid valve LCZ 9662 (controlled by Proline by means of
LiBus) as optional accessory the cooling water will only be opened if cooling is required.
The LCZ 9662 cooling liquid valve is approved for Proline heating thermostats up to a bath
temperature of 155 °C if they are operated on a drinking water line with an unpressurized
outlet into the waste water system. Safe operation of the coolant valve with water on a Pro-
line thermostat above 100 °C is possible here because the coolant can flow out of the ther-
mostat's cooling coil and does not have to be completely evaporated first.
If the cooling liquid valve opens and cooling water enters the cooling coil at a bath tempera-
ture of over 100 °C, a brief burst of steam occurs, which is why the free hose end of the
cooling coil must be fixed at the outlet.
The cooling capacity of the cooling coil depends on the bath temperature of the thermostat
and the temperature of the cooling water.
If oil is used as the heat transfer liquid instead of water, a slightly lower cooling capacity at the
same bath temperature can be assumed. However, if higher bath temperatures (up to
155 °C) are used, the cooling capacity increases further due to the higher temperature gra-
dient between the heat transfer liquid and the cooling water.
The LCZ 9662 cooling liquid valve is approved for Proline heating thermostats up to a bath
temperature of 100 °C when operated on a central cooling water system.
In practice, the operating pressures in a central cooling water system vary greatly and the
return lines are not depressurized. This means that the cooling coil does not run empty when
the cooling liquid valve is closed. The temperature control process is therefore massively im-
paired at temperatures above the boiling point of the cooling water due to the high heat ex-
traction when the cooling water evaporates in the cooling coil. Furthermore, the effect of
possible steam blasts on the central cooling water circuit and consumers connected to it
cannot be estimated.
When operating Proline heating thermostats above 100 °C to 300 °C, we recommend the
LAUDA high-temperature cooler HTC, order number LCZ 9663.
Proline heating thermostat 21 / 123