EQJW145:
Heating controller
Commissioning
7010015003 A
31
© Fr. Sauter AG
A limit value of between 16 and 60 pulses / minute cannot be entered
because the measurement accuracy required for control is no longer
available in this range. If a value in the range from 60 to 16,000 has been
entered for one of the limit values (SP29, SP30 or SP31), the other two
limit values must be in the range from 60 to 16,000 or must be disabled
(value of SERVice parameter = 'no'). Otherwise, there may be faulty
monitoring of the limit value leading to faulty control behaviour. During DHW
heating at increased DHW temperature, the limiting function is not enabled
so that protection against legionella can be enabled if required.
Intervention intensity in case of violation of maximum limit value for quantity
measurement
The flow temperature is reduced each minute by the value that was entered
for SP32 if the limit for quantity metering is violated. The flow temperature is
adapted 'continuously' (i.e. about once a second) to its value in this case. If
the value falls below the limit value for quantity measurement again, the flow
temperature is increased again at 1/5 of the set intervention intensity.
Limit value for minimum flow or power
This function is used to limit see page. It prevents a constant low flow if the
energy requirement is low. In this case, the mixer is closed and only opened
again if a control divergence of over 5 K occurs. The value is entered in
pulses / min.
To convert the limit value for flow or power into a value in units of pulses /
min, see the examples given with the explanations for SP29 to SP32.
Functions for DHW
The plant structure for control model MOD1, 2 (see SP06, control models)
can be extended by adding DHW preparation. SP34 must be set as per the
existing DHW preparation.
separate charge pump diverter valve
one DHW sensor
SP34 = 1,
SP34 = 3
two DHW sensors
SP34 = 2 SP34 = 4
Tab. 3: DHW preparation
If the SERVice parameter has value 0, the DHW functions are not enabled
(except with MOD3).
SP32
SP33
SP34
To Next Page
Loading...
