sauter EQJW145, Operating Manual

Page: 29 / 110

EQJW145: Heating controller
Commissioning
7010015003 A
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© Fr. Sauter AG
T
R F m ax .
T
L 0 (R F )
T
A (R F)
T
L 0B W (R F )
T
L U (R F )
T
A
B 1 09 8 0
Fig. 4: Limitation function
The following parameters are available to set the limiting function:
SP23
Upper value of maximum limit for primary return temperature
(T
LO(RF)
) for heating.
SP24
Lower value of maximum limit for primary return temperature
(T
LU(RF)
) for heating.
SP25
Outdoor temperature (T
A(RF)
) at which the sliding portion of
the limiting function for the primary return temperature starts
during heating.
SP26
Slope (S
L(RF)
) of the sliding portion of the limiting function for
the primary return temperature for heating.
SP27
Maximum limit (T
LOBW(RF)
) for the primary return temperature
during DHW heating.
In MOD1 or MOD2, if the heating is in reduced or normal mode and DHW
heating occurs at the same time, the maximum limit value for the primary
return temperature is checked with the outdoor-temperature-dependent value
for the heating circuit and the fixed value for the DHW during this time.
To make the return temperature limitation effective, return temperature
recording must be enabled (see SP13). In summer mode, or if the heating is
in back-up mode, the limitation on the return temperature for the heating is
not enabled.
Intervention intensity if return temperature is exceeded
If the limiting function for the return temperature set with SP23-SP27 is
exceeded, the setpoint for the flow temperature is reduced by the value
indicated in SP28 for each degree of the excess.
SP 28