Installation Method - TECH ST-21D5 User Manual

Microprocessor temperature controller
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Errors displayed
c2
– Heat source sensor error
c1
– Tank sensor error
AL2
– The message and the current T2 temperature are displayed
alternately when the anti-freezing function is turned on (T2 sensor
signal).
AL1
– The message and the current boiler temperature are displayed
alternately when the anti-freezing function is turned on (boiler sensor
signal).
-A-
– Message indicating that the anti-stop function is on.
NOTE: The occurrence of any alarm will activate the pump
irrespective of the current temperature.

Installation method

Installation should be carried out by a qualified electrician! The sensor
should be fastened using a cable tie and protected isolated from external
influences using insulating tape. Power cord should be connected as
follows:
blue and brown cables: 230V,
yellow-green protective conductor: ground.
Distance between fixing holes is 86.5 mm.
Item Specification
1
Power supply
2
Power consumption
3
Ambient temperature
4
Load on central heating pump output
5
Temperature adjustment range
6
Measurement accuracy
7
Thermal resistance of the sensor
8
Thermal resistance of the sensor2
9
Fuse link
10
Sensor cable length
The controller is protected with WT cylindrical fuse link 1.6 A.
Unit
V
230V/50Hz +/-10%
W
2
O
C
5÷50
A
1
O
C
0÷90
O
C
+/- 1
C
-25÷90
O
O
C
-25÷90
m
1,5
A
1,6

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