A03 Stop Hysteresis Solar Circuit Pump; A07 Flow Rate Solar Circuit For Calculating Solar Yield; A09 Display Message Incorrect Circulation - Viessmann VITOTRONIC 200 Service Instructions Manual

Parameter group solar

7A03 Stop hysteresis solar circuit pump !

Only in conjunction with integral solar
control function ("Type solar control
unit 7A00"):
The set value determines the tempera-
ture differential between the collector
temperature sensor and the cylinder
temperature sensor at which the solar
circuit pump is stopped.
Note
The value for "Start hysteresis solar
circuit pump 7A02" must be greater
than the value for "Stop hysteresis
solar circuit pump 7A03".

7A07 Flow rate solar circuit for calculating solar yield !

Only in conjunction with integral solar
control function ("Type solar control
unit 7A00"):
This value is used to calculate the solar
yield. The value for the flow rate must be
calculated from the set pump rate of the
solar circuit pump and the pressure drop
in the solar circuit.

7A09 Display message incorrect circulation !

Only in conjunction with integral solar
control function ("Type solar control
unit 7A00"):
If the check valve in the solar circuit is
faulty, low collector temperatures can
result in unwanted incorrect circulation
(recirculation) within the solar circuit.
Display of the message "A4 Check
valve" is enabled by setting this param-
eter.
124
Delivered condi-
tion
30 (≙ 3 K)
Delivered condi-
tion
100 l /h
Valu Explanation
e
"0" Message does not appear.
"1" Message is displayed.
Delivered condi-
tion
1
Setting range
10 to 150
(≙ 1 to 15 K)
Setting range
10 to 500 l/h
Setting range
0 / 1