Special Function: Switching Contacts; Smartstart Function - Daikin RoCon BF Operating Instructions Manual

3 x Operation
Switch-off condition:
Tdhw < T or Tdhw < [T-HS Setpoint] info parameter (see
HZUmin
chap. 3.6.3)
If the switch-off condition is fulfilled, the heating support from the
hot water storage tank is set and the burner takes over the
heating operation.
The [Power BIV] parameter limits the maximum power that can
be removed. The [T vbh1 max] parameter limits the maximum
temperature that can enter the heating system.

3.6.13 Special function: Switching contacts

By setting the [AUX Fct] parameter, the switching conditions for
the potential-free AUX switching contact (toggle switch output A).
This switching contact can be used to control an external heat
generator, for example.
If one of the switching conditions is fulfilled, the potential-free
switching contact is switched after the time set in the [AUX time]
parameter.
AUX switching contact (toggle switch output A) is not switched
if
setting =
0: function deactivated.
AUX switching contact (toggle switch output A) is switched if
setting =
1: storage temperature (Tdhw) ≥ value [T-DHW 1 min] param-
eter.
2: if an error is pending.
3: outside temperature < [Equilibrium Temp] parameter value.
4: hot water generation heat requirement.
5: room heating heat requirement.
6: room heating or hot water generation heat requirement.
3.6.14

SmartStart function

The SmartStart function was developed to avoid frequent
switching of the burner when there is a low room heating heat re-
quirement.
Here, the burner runtime is recorded after a burner start for room
heating.
If this burner runtime is shorter than the minimum burner runtime
set in the [BST Control] parameter, the SmartStart function is au-
tomatically activated. The requirement for room heating is tempo-
rarily covered by the heat stored in the storage tank.
If the storage temperature drops so far that a requirement for hot
water generation (Tdhw < (current hot water target temperature -
[Hysteresis DHW] parameter)) is pending, this takes place at a
greater target value (current hot water target temperature + [Exp
delta WW ] parameter).
The SmartStart function remains active until the next requirement
for hot water generation is pending. This then takes place again
according to the normal control algorithm after which the hot
water generation is ended when Tdhw reaches the current hot
water target value.
If, after a burner start, the burner runtime is longer than the set
minimum burner runtime for room heating, the SmartStart
function is not activated.
The [HT Protect] parameter (see tab. 6-2) limits the raised target
value of the storage temperature.
Operating instructions
28
Daikin RoCon
Daikin Control unit
008.1543999_00 – 03/2017 – EN