Unit description
4
3 Unit
description
3.1 Unit
types
The type designation of the Ecoline low-temperature thermostats consists of the letter R (identification as
low-temperature unit), the control unit E 200 or E 300, and the type of bath and refrigeration system
Example: Control unit E 200 and bath RE 004 produces Thermostat Type RE 204.
Type RE 220 is supplied without bath cover. A bath cover is available as accessory.
(
➾
Section 10. Accessories).
3.2 Pumps
All units are equipped with a pressure pump with vario drive. The pump has an outflow with a rotatable
discharge elbow. An additional outflow provides circulation inside the bath.
By turning the setting knob it is possible to choose between both outlets or to divide the flows.
The pump ca n be used up to viscosities of 150 mm²/s however, to get an optimum accuracy of control a
viscosity of 30 mm²/s is recommended.
One of five pump output steps can be selected using the operating menu.
On small low-temperature thermostats (e.g. RE 204 or RE 306) and with operation as bath thermostat it
is advisable to use output step 2. The advantage is a low heat generation while having a uniform
circulation, that means, that the thermostat can work without cooling down to just above ambient
temperature.
When operating as circulation thermostat with an external circuit it is preferable to use a larger flow rate
in order to ensure a small temperature difference, especially at higher temperatures and in conjunction
with oil as the bath liquid.
The pump connections of Types RE 3xx are fitted with M 16x1 nipples.
The pump connection outflow can be closed off without causing any damage to the pump.
Pump characteristics
(
➾
Section 9. Technical data)
3.3
Temperature indication, control, and safety circuit
The unit is equipped with a 2-line LCD-Display with additional symbols for indicating bath temperature
and settings as well as operating states. On RE 3xx-Types the display has back-lightning. The input of
the setpoint and other additional adjustments are done using either two or three keys.
Remote operation is possible via an electrically isolated RS 232 interface
Summary of Contents for Ecoline RE 204
Page 2: ......
Page 8: ...Brief operating instructions 2 ...
Page 59: ...Circuit diagram 10 08 99 YACE0060 53 11 Circuit diagram ...
Page 60: ...Circuit diagram 54 ...
Page 63: ...Pipe plan 16 08 99 YACE0060 57 12 Pipe plan ...
Page 64: ...Pipe plan 58 ...
Page 65: ...Pipe plan 16 08 99 YACE0060 59 ...
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