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First start-up
Installation, use and maintenance manual – K18 Simplygas
41
5
managed by an external controller or is completely absent.
▶
Also in the case of direct management of DHW production
by the appliance, if there is also an auxiliary boiler, it is nec-
essary to install the DHW charging circuit temperature probe
(GHP', detail 16 in Figure 3.2
p. 23) and connect it to the
AUX PROBE 2 input (Paragraph 4.8.3
p. 35); then assign the
value 1 (DHW regulation probe) to parameter 209.
▶
If weather compensation is activated (see Paragraph
6.6.1
p. 46), the installation of an outdoor temperature
probe EXT.T (optional OSND007) is recommended; install this
probe in north facing, protected by direct sunlight and far
from heat sources (windows, discharges, ecc.) and connect
it to AUX PROBE 2 input (see Paragraph 4.8
rameter 209 to 2 (outdoor temperature probe). If this probe
is not installed weather compensation will be based on the
value provided by outdoor temperature probe onboard unit,
a little less accurate. However, if the system requires all three
GHP, GHP' and GHP'' probes, the outdoor temperature probe
cannot be installed. In this case the regulation based on cli-
mate curve can only use the value provided by the outdoor
temperature probe installed onboard the appliance.
5.3.6
Settings depending on auxiliary heat source
presence
To activate the control of an auxiliary boiler set parameter 49 to:
1. for auxiliary boiler controlled by 0-10 V signal
2. for auxiliary boiler controlled by ON/OFF signal
▶
With reference to the possible functions of the auxiliary boil-
er for the space heating service (see Paragraph 1.1.5
and further on in this Paragraph), set parameter 50 to:
1. for emergency mode
2. for integration mode
3. (default value) for integration and replacement mode
▶
In the presence of the DHW service, with reference to the
possible functions of the auxiliary boiler for this service (see
also further on in this Paragraph), set parameter 51 to:
0. to exclude the auxiliary boiler from operating on the
DHW service (DHW produced exclusively with the K18
unit)
1. for the emergency mode (activation of the auxiliary boil-
er only in case of an alarm on K18 unit)
2. for the integration mode (activation of the auxiliary boil-
er in addition to the K18 unit, when necessary)
3. for replacement mode (DHW produced only with auxil-
iary boiler)
4. (default value) for the integration and replacement
mode (activation of the auxiliary boiler in addition and,
in certain conditions, in replacement of the K18 unit)
▶
Referring to Paragraph 4.9
p. 35, if auxiliary boiler is con-
trolled by 0-10 V signal to communicate required setpoint
(parameter 49 set to 1), it is necessary to configure the 0-10V
AUX BOILER output voltage / temperature curve, in order to
match the one required by the auxiliary boiler; this informa-
tion must be available in the documentation provided by
the auxiliary boiler manufacturer. Proceed as follows:
1. Set parameter 52 to the temperature value which must
correspond to 0 V output.
2. Set parameter 53 to the temperature value which must
correspond to 10 V output.
3. If the 0-10 V signal is also used as request signal (second
case described in Paragraph 4.9
p. 35), parameter 54
must also be set to the temperature that corresponds
to the minimum switch-on level of the auxiliary boiler;
if this value can be varied from the configuration of the
parameters of the auxiliary boiler, it must be set to the
lowest possible value, and then set parameter 54 of the
K18 unit accordingly.
Through this setting, the K18 unit requests a "dummy"
service on the auxiliary boiler, providing the minimum
setpoint value when only the water pump of the auxil-
iary boiler must be switched on.
If, on the other hand, the 0-10 V signal is only used to
communicate the setpoint value, while the service re-
quest is activated from the ON/OFF request (third case
described in Paragraph 4.9
p. 35), leave parameter 54
set to its default value (0 °C).
▶
With reference to Paragraph 4.9
p. 35, if the auxiliary boiler
is only controlled from the ON/OFF request, parameter 41
must be adequately configured. In order to do this:
1. Obtain the switch-off delay of auxiliary boiler circulating
pump with respect to the switch-off of the heat source
(in the case of a boiler: burner switch-off) by referring to
the documentation of the auxiliary boiler or alternative-
ly, verifying experimentally; generally, this delay lasts a
few minutes.
2. Set parameter 41 to the next lower value (for example, if
the switch-off delay is 3 minutes, set parameter 41 to 2).
Through this setting, the K18 unit briefly activates the
ON/OFF request, according to the timing set in param-
eter 41, when only the circulating pump of the auxiliary
boiler must be switched on.
▶
With reference to Paragraph 4.9
p. 35, if the auxiliary boiler
can provide an alarm signal if the boiler itself is unavailable
(for this purpose, refer to the documentation provided by
the manufacturer of the auxiliary boiler), this signal can be
controlled by setting parameter 55 to:
1. if the alarm signal of the auxiliary boiler is normally open
(NO)
2. if the alarm signal of the auxiliary boiler is normally
closed (NC)
The availability and actual connection and configura-
tion of the auxiliary boiler alarm signal is necessary for
the integration and replacement operating mode of the
auxiliary boiler to be used (parameter 50 set to 3 and/or
parameter 51 set to 4).
▶
The setpoint value communicated by 0-10 V signal to the
auxiliary boiler can be increased by a constant boost value
with respect to the actual system setpoint. This is sometimes
useful to guarantee that the outlet manifold can actually
reach the setpoint, even despite water mixing occurring on
the secondary circuit. If required, set parameter 203 to the
desired boost value. It is recommended to limit the boost
value to that which is strictly needed.
▶
It is possible to inhibit auxiliary boiler operation in integra-
tion mode for space heating service (not for DHW service)
above a set outdoor temperature threshold.
To use this function, set parameter 185 to the desired
outdoor temperature threshold value.
To disable this function, set parameter 185 to maximum
value (40 °C).
Even when inhibited by the above function, the auxiliary
boiler remains active for the emergency function.
The function uses the filtered value with a constant time