LAUDA Ultra-Thermostats
UB 20(-D), UB 25, UB 50, UB 30, UB 40
UB 20 F, UB 20 J, UB 30 J, UB 40 J, UB 65 J
UB 20 JL, UB 30 JL, UB 40 JL
YATE0013 /10.04.02
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8
Cooling the thermostats
Because of the frictional heat of the circulating pump, thermostating without cooling can
only start appreciably above the ambient temperature (see Technical data, working
temperature range, lower limit). For lower temperatures it is essential to work with
cooling.
The following possibilities are available for cooling:
8.1
Mains water cooling
Depending on the water temperature down to 15°C. The thermostats are equipped with
a cooling coil (at the rear) which is linked by tubing to the water tap and to the drain. The
flow should be kept as low as possible; this saves water and improves the temperature
control. Controlled cooling is possible when using a solenoid valve (see Item 3.7)
8.2
Through-flow chillers DLK 10, DLK 25 and DLK 45
Can be used, depending on the thermostat type, down to -10°C (DLK 10), -30°C
(DLK 25) or -40°C (DLK 45). Use insulated hoses for the connection between the flow
and return connections of the pump and the nipples of the through-flow chiller. If the
thermostat operates in a closed external circuit the chiller is connected in series in the
return line from the external system to the thermostat.
Always use water-glycol mixture (ratio 1:1).