Error on the probe
An error on a probe only affects the functions that use the probe. The controller can no longer execute the
affected function correctly and stops controlling this function. All other functions of the controller continue to
work properly.
Error on the probe
Terminal
Effect on control
Inlet temperature, primary (TVL)
1,
^
The controller takes 75 °C as the preliminary
value so that regulation can continue to be
carried out.
Hot water temperature, secondary (TWW)
2,
^
The controller uses the temperature value of
the E.1 and T probes for regulation.
Source temperature, primary (TQ)
3,
^
The source temperature has no effect on reg-
ulation.
Cold water temperature, secondary (TKW)
4,
^
The cold water temperature has no effect on
regulation
Hot water temperature, secondary
E.1, T
FriwaMini Basic and Premium: Regulation
stops. FriwaMidi, FriwaMaxi, FriwaMega: The
hot water temperature at terminals 2,
^
is
used for regulation. An error on E.1, T has no
long-term effect on regulation.
Medium flow rate, secondary
E.1, V‘
Regulation stops.
Check the temperature probe Pt1000
DANGER!
Danger of death due to electric shock!
Before opening the unit, ensure that all cables that lead to the unit are disconnected from the mains and
cannot be inadvertently connected to the mains!
1.
Remove the terminal cover.
2.
Disconnect the temperature probe.
3.
Measure the resistance of the temperature probe with an ohmmeter and compare them with the table
below. Slight variations are permitted.
4.
Attach the terminal cover.
Correlation between temperature and resistance
Temperature
[°C]
-30
-20
-10
0
10
20
30
40
50
60
70
Resistance [Ω]
882
922
961
1000
1039
1078
1117
1155
1194
1232
1271
Temperature
[°C]
80
90
100
110
120
130
140
150
160
170
180
Resistance [Ω]
1309
1347
1385
1423
1461
1498
1536
1573
1611
1648
1685
33
Содержание EFS 25
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