Setting The Domestic Hot Water Parameters - Beretta POWER MAX 50 P DEP Installation And Operation Manual

3 2 4 Setting the domestic hot water
parameters
The parameter 2035 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 heat-
ing 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 be-
low 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 fol-
lowing:
Par
Description
No
2036 Defines the hysteresis to initiate the domestic hot
water demand.
2037 Defines the hysteresis to stop the domestic hot
water demand.
Defines the primary circuit's set-point increase in
2038 degrees compared to the temperature set for the
domestic hot water tank.
Defines the primary circuit's restart hysteresis in
2039 modes 1 and 2 of DHW (valid both for cascade
and stand-alone applications).
Defines the primary circuit's shut-off hysteresis in
2040 modes 1 and 2 of DHW (valid both for cascade
42 and stand-alone applications).
0048 Establishes the DHW storage tank set-point.
The set point value can be set directly without entering
the parameter list as indicated on Par. "USER navigation
MENU".
Mode 2
(DHW production with storage tank controlled by a ther-
mostat)
In this case the thermal module is activated when the con-
tact in boiler's thermostat is closed and is deactivated
when the latter is opened.
The parameters that control DHW production are the fol-
lowing:
Par
Description
No
Defines the primary circuit's set-point increase in
2038* degrees compared to the temperature set for the
domestic hot water tank.
Defines the primary circuit's restart hysteresis in
2039 modes 1 and 2 of DHW (valid both for cascade
and stand-alone applications).
Defines the primary circuit's shut-off hysteresis in
2040 modes 1 and 2 of DHW (valid both for cascade
and stand-alone applications).
Par
Description
No
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 de-
grees, the module turns on at the minimum to al-
2041
low maintenance till the set point plus hysteresis.
If this parameter is equal to 2036, this function is
inactivated and the thermal module starts at the
maximum sanitary power.
0048 Establishes the DHW storage tank set-point.
Parameter 2038 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
efficiency is maximized.
The set point value can be set directly without entering
the parameter list as indicated on Par. "USER navigation
MENU".
Priority setting
The parameter 2042 sets the priorities between the DHW
and CH circuit.
Four modes are envisaged:
: priority allocated to the DHW circuit
1 On
: priority given to the heating circuit
2 Off
: timed priority between the two circuits. In the
3 Time
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
2043. 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
: both circuits operating simultaneously, with
4 Parallel
the proviso that the water delivery temperature of
the primary circuit must be lower than the setpoint
requested by the heating circuit. When the primary
circuit's temperatures exceeds the CH setpoint, the
heating pump is switched off and the priority is revert-
ed to the DHW circuit.
Anti-Legionella function
This function is only on when the circuit for DHW production
is on mode 1.
The anti-legionella function is activated automatically on
the module start up and it is repeated every 7 days (this
parameter can be modified).
If the appliance is electrically discharged, the cycle de-
scribed below will be repeated at the next start.
During the cycle of anti-legionella the thermal module gen-
erates a demand for the sanitary gathering set with a pre-
set set point of 60 ° C (not modifiable). Once the temper-
ature of 60 ° C is reached, the temperature is maintained
for 30 minutes during which the system checks that the
temperature of the probe does not drop below 57°C. At the
end of this time, the anti-legionella function is terminated
and the normal operation of the thermal module is reset.
Anti-legionella mode has the priority over other requests
regardless of the several parameters setting.