IV. Maintenance
The technical conditions of the wires of the ST-28 controller
should be inspected prior to the heating season as well as
during its duration. The mounting of the controller should be
checked and the dust and other contamination should be
removed. Furthermore, the measurements of the grounding
efficiency of the electric motors (of CH pump, UHW pump and
fan) must be taken.
No. Item
Unit
1
Power supply
V
230V/50Hz +/-10%
2
Power input
W
2
3
Environment temperature
O
C
10
÷5
0
4
Circulation pump output load
A
1
5
Fan output load
A
1
6
Temperature measurement range
O
C
0
÷85
7
Measurement accuracy
O
C
1
8
Temperature setting range
O
C
30÷80
9
Temp. Sensor durability
O
C
-
25 ÷100
10
Fuse
A
,
2 5
13