Robur K18 Simplygas, Инструкция по установке, эксплуатации и обслуживанию

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Normal operation
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6
the presence of a signal coming from a timer, on which the time
slots must be set. This is the typical scenario in which you want
to have the buffer tank at a higher temperature (comfort) in the
peak usage time slots, while in the others you use a lower set-
point (reduced).
In this case the COM-DHW contact must be connected to the re-
quest signal from the external timer (SELV NO voltage-free con-
tact) and both parameter 227, which represents the value of the
comfort setpoint of the DHW buffer tank, and parameter 237,
which corresponds to the reduced setpoint of the DHW buffer
tank, must be set appropriately.
The K18 appliance will keep the DHW buffer tank temperature
around the value of the comfort setpoint, set in parameter 227,
if required by the external timer (COM-DHW contact closed).
Otherwise it will keep the DHW buffer tank temperature around
the value of the reduced setpoint, set in parameter 237.
5.4.2.5
Fixed setpoint with anti-legionella function (with
external timer)
▶
COM-DHW contact: connected to a daily/weekly timer
▶
Parameters to set: 227, 237
This mode must be chosen when you want to have the possi-
bility to activate the DHW request on a comfort setpoint and
activate the anti-legionella thermal disinfection in the presence
of a signal coming from a timer, on which the periodicity and
duration must be set.
In this case the COM-DHW contact must be connected to the
request signal from the external timer (SELV NO voltage-free
contact) and both parameter 227, which represents the value of
the anti-legionella disinfection setpoint of the DHW buffer tank,
and parameter 237, which corresponds to the comfort setpoint
of the DHW buffer tank, must be set appropriately.
The K18 appliance will keep the DHW buffer tank temperature
around the value of the anti-legionella setpoint, set in param-
eter 227, if required by the external timer (COM-DHW contact
closed). Otherwise it will keep the DHW buffer tank temperature
around the value of the comfort setpoint, set in parameter 237.
5.4.3 Delivery temperature
The water delivery setpoint used by the K18 appliance during
DHW service will be the sum of the value of parameter 227 or
237 (depending on the status of the COM-DHW contact) and the
value of parameter 236.
Parameter 236 expresses the increase in the delivery water tem-
perature setpoint compared to the setpoint in the DHW buffer
tank (expressed by parameters 227/237) which is necessary to
achieve adequate heat exchange in the DHW buffer tank.
For example, if parameter 227 is set to 55 °C and parameter 236
is set to 5 K, the setpoint value for the delivery water temper-
ature in the event of a DHW request with COM-DHW contact
closed will be (55+5) = 60 °C.
5.4.4 Correct setting of DHW parameters
The DHW production service always has priority over the space
heating service so, in case of an active DHW request, the three-
way diverter valve will be switched on the DHW service until the
DHW request is satisfied, ignoring any space heating requests
coming from the system.
Setting a setpoint too high for the DHW buffer tank will
mean that the K18 appliance will not be able to achieve
it and will therefore not be able to return to the space
heating service, generating a potential lack of comfort
in heated rooms.
The correct parameters setting for the DHW production service,
therefore, becomes decisive not only from an energy and eco-
nomic point of view, in order to obtain maximum efficiency from
the K18 appliance, but also to correctly meet both the DHW and
space heating service requests.
6 NORMAL OPERATION
This section is for the end user.
6.1 WARNINGS
General warnings
Prior to using the appliance carefully read the warnings
in Chapter III.1
p. 4, providing important information
on regulations and on safety.
First startup by TAC
First start-up may exclusively be carried out by a Robur
TAC (Chapter 5 p. 36).
Never power the appliance off while it is running
NEVER power the appliance off while it is running (ex-
cept in the event of danger, Chapter III.1 p. 4), since
the appliance or system might be damaged.
6.2
SWITCH ON AND OFF (HEATING
SERVICE)
Routine switching on/off
The appliance may be exclusively switched on/off using
proper control device (OQLT021, OCDS007 or external
request).
Do not switch on/off with the power supply switch
Do not switch the appliance on/off with the power sup-
ply switch. This may be harmful and dangerous for the
appliance and for the system.
Checks before switching on
Before switching on the appliance, ensue that:
„ gas valve open
„
appliance electrical power supply (main switch GS ON,
Figure 4.2 p. 31)
„
OQLT021 or OCDS007 power supply (if present)
„ water circuit ready and filled
6.2.1 How to switch on/off
▶
If the appliance is controlled by the OQLT021 controller, refer