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COMMISSIONING AND MAINTENANCE
3.1.5
Setting the domestic hot water parameters
The parameter 35 defines the various operation modes of the
thermal module for DHW production
Mode 0
(No production of domestic hot water)
In this mode the thermal module will work only for the heating
circuit (see paragraph "Setting the heating parameters")
Mode 1
(DHW production with storage tank and storage cylinder probe)
In this mode, the thermal module is activated when the tem-
perature recorded by the storage cylinder probe falls below the
DHW setpoint by an amount equal to the hysteresis value and is
deactivated when the temperature rises above the DHW setpoint
by the value of the hysteresis.
The parameters that control DHW production are the following:
Par.
Description
No.
Defines the hysteresis to initiate the domestic hot
36
water demand.
Defines the hysteresis to stop the domestic hot water
37
demand.
Defines the primary circuit's set-point increase in de-
38
grees compared to the temperature set for the domes-
tic hot water tank.
Defines the primary circuit's restart hysteresis in modes
39
1 and 2 of DHW (valid both for cascade and stand-
alone applications).
Defines the primary circuit's shut-off hysteresis in
40
modes 1 and 2 of DHW (valid both for cascade and
stand-alone applications).
Defines the value referred to the Delta T of the tank for
maintenance purposes. E.g.: if it is set on 3, when the
tank has a set point lowered of 3 degrees, the module
41
turns on at the minimum to allow maintenance till the
set point plus hysteresis. If this parameter is equal to
36, this function is inactivated and the thermal mod-
ule starts at the maximum sanitary power.
48
Establishes the DHW storage tank set-point.
The setpoint value can be set directly, without entering the list
of the parameters:
− Press MENU and select "Domestic Hot Water" using the ▲
/ ▼ keys.
Menu
"
"
Central Heating (CH)
"
"
Domestic Hot Water (DHW)
"
"
Information
"
"
Settings
"
"
− Press the ● key to confirm.
Domestic Hot Water (DHW)
"
"
DHW Setpoint
45.0
"
"
− Use the ► key to highlight the value, and use the ▲ / ▼
keys to change the selected value. Press the ● key to con-
firm/save the new settings..
the DHW value can be changed only when the "domestic hot
water" function is enabled. See paragraph "Password access"
for instructions about outdoor recovery.
Mode 2
(DHW production with storage tank controlled by a thermostat)
In this case the thermal module is activated when the contact in
boiler's thermostat is closed and is deactivated when the latter
is opened.
The parameters that control DHW production are the following:
Par.
Description
No.
Defines the primary circuit's set-point increase in de-
38*
grees compared to the temperature set for the domes-
tic hot water tank.
Defines the primary circuit's restart hysteresis in modes
39
1 and 2 of DHW (valid both for cascade and stand-
alone applications).
Defines the primary circuit's shut-off hysteresis in
40
modes 1 and 2 of DHW (valid both for cascade and
stand-alone applications).
48
Establishes the DHW storage tank set-point.
(*)
Parameter 38 is active on such mode even if the
tank probe is not installed and it influences the flow
temperature of the module.
It can be used to limit the difference between the flow and set
temperature on the tank thermostat so that the system efficien-
cy is maximized.
Also in this case,the setpoint value can be set directly, without
entering the parameters list, by accessing the "Domestic Hot
Water" menu, as already earlier for mode 1.
70
Priority setting
The parameter 42 sets the priorities between the DHW and CH
circuit.
°C
Four modes are envisaged:
"
"
0
Time: timed priority between the two circuits. In the event
of a simultaneous demand, initially the domestic hot water
circuit is made to operate for a number of minutes equal to
the value assigned to the parameter 43. At the end of this
time period, the CH circuit is operated (also for the same
amount of time) and so on until demand for one or the
other circuit stops
1
Off: priority given to the heating circuit
2
On: priority allocated to the DHW circuit
3
Parallel: simultaneous operation of both circuits provided
that the delivery temperature requested by the DHW circuit
is lower than or equal to the setpoint requested by the
heating circuit. When the temperature requested by the
DHW circuit exceeds the heating setpoint, the circulation
pump of the heating is turned off and priority is switched
to the DHW.
Anti-Legionella function
When the production of domestic hot water is activated (Par.
35= 1), using the parameters 107 and 108 it is possible to carry out
a weekly scheduling of the "Anti-legionella" function.
Parameter 107 sets the day of the week on which the activity is
performed, whilst parameter 108 sets the time.
At the planned time, the thermal module generates a heat de-
mand for DHW storage tank with a pre-set set-point of 60°C (not
adjustable). After reaching 60°C, the temperature is maintained
for 30 minutes, during which the system checks that the probe's
temperature does not fall below 57°C. At the end of this time
interval, the Anti-Legionella function stops and standard oper-
ation of the thermal module is resumed.
Operation in "Anti-Legionella" mode has priority over other de-
mands independently from the setting of the parameter42.
Par.
Description
No.
Sets the weekday on which the anti-Legionella proce-
107
dure is carried out.
Sets the time of the day during which the anti-Le-
108
gionella procedure is carried out.
COMMISSIONING AND MAINTENANCE
3.1.6
Scheduled programme
The Scheduled Programme is designed to program the opera-
tion of the various circuits managed by the thermal module, (CH,
DHW and additional mixed zones).
Seasonal Programme
The Seasonal Programme is use to exclude additional mixed
zones during the summer season.
It does not control any DHW parameter.
Holiday Programme
The Holiday Programme is used to exclude part of or all the cir-
cuits at a certain time of the year.
A holiday can be set both on the full system and on various
groups of circuits.
The group system enables the user to add various circuits to the
group to set a holiday period for several circuits at the same
time. (For instance, to manage a semi-detached house with a
centralised heating system when one of the two families is on
holiday and the other is not).
The set-point type can be adjusted so as to correspond to the
desired setting.
The system can control up to a total of 16 "Mixed" zones. The
programming of mixed areas is only allowed with an accessory.
At the same time as these 16 areas, it is also possible to enable
the CH zone (direct zone for central heating only).
Clock Program
"
"
Program Group
"
"
Burn hours till service
"
"
Reset Service Reminder
"
"
Holiday Settings
"
"
The time programme includes the following parameters:
Group Programming
Group
1
"
"
Group Holiday
Enabled
"
"
"
"
Select Ext. Zones in Group
"
"
Select Dep. Zones in Group
"
"
It enables the user to select a group to add zones to the selected
group. It also enables the user to enable/disable the group in
question.
Group settings are used to add zones to the groups.
The "Group programming" menu enables the use to chose
among 8 groups. Each of them can be enabled or disabled.
Within it, it is possible to select zones to be added to the group
(direct zone (CH) - mixed zones from 1 to 16)
Select Ext. Zones in Group
1
"
"
External Zone
CH
Disabled
"
"
"
"
"
"
External Zone
1
Disabled
"
"
"
"
External Zone
2
Disabled
"
"
"
"
External Zone
3
Disabled
"
"
"
"
N.B.
The programming of mixed areas is only allowed with an
accessory.
71
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