Riello ALU PRO power Series Instructions For The Installer And The Technical Assistance Centre page 22

With a storage cylinder probe, the anti-legionella function
can be activated (H614) in the following ways:
H614 = 0
H614 = 1
H614 = 2
If the weekly mode is set, the function is activated at
02:00 on Wednesday.
If the daily mode is set, the function is activated every
day at 02:00.
If the clock is not working, the function is deactivated.
The setpoint value of the domestic hot water tempera-
ture during the Anti-legionella phase is 60°C (cannot be
changed).
With the OT+ input activated, the v button is disabled and
the domestic hot water control passes to the regulator con-
nected to OT+.
BOILER SET POINT IN DOMESTIC HOT WATER PHASE
The setpoint of the boiler delivery temperature during the
domestic hot water phase is calculated by adding to the
hot water temperature a value equal to parameter H510.
The setpoint is between a minimum value (H508) and a
maximum value (H509).
NB. The delivery temperature of the boiler in domestic
hot water mode cannot be higher than the maximum
value of the temperature of the individual modules
C517.
DOMESTIC HOT WATER PUMP MANAGEMENT MODE
Using parameter C805 to select the operating mode of
the domestic hot water pump.
- C805 = 0 - the hot water pump is managed upstream
of the water equalisation device: when there is a DHW
request, the primary pump remains off;
- C805 = 1 - the hot water pump is managed downstream
of the water equalisation device: when there is a DHW
request, the primary pump is switched on together with
the DHW circulator;
- C805 = 2 - the DHW pump is managed as a zone pump
downstream of the water equalisation device; the DHW
request is not handled; when there is a CH request,
both pumps are switched on (primary and DHW).
22
GENERAL
Anti-legionella disengaged
Anti-legionella weekly
Anti-legionella daily
ADDITIONAL FUNCTIONS
0-10V output (modulating pump)
The 0-10V analogue output available on the boiler is used
for a rapid control of the system pump that is managed so
as to maintain the boiler delivery-return delta at the value
set with parameter H605.
The signal outputs have the following meaning:
0V = switching off pump
1V = minimum speed
10V = maximum speed
The modulation field is between 1 V and 10 V, but it is
possible to limit this variation if conditions require it, by
setting a minimum value that can be set with parameter
H615. The value is in volts and limits the analogue output
above this value.
The modulating pump is controlled with PID logic.
Time band programming
It is possible to carry out weekly time band programming
for the heating circuit and one for the domestic hot water
circuit.
For each day it is possible to set up to 3 phases, during
which the circuit is enabled to operate, while outside the
phase any requests will be ignored.
Using the pre-selection parameter P900 for heating and
P960 for domestic hot water it is possible to select a time
period that is valid for the programming entered: for a
single day, for all the days of the week, for the period
Monday-Friday or for Saturday-Sunday.
It is also possible to set the default values using the
parameters P916 for heating and P976 for domestic hot
water.
SetPoint limitation with return line Probe
The temperature setpoint of the water is managed so
as to keep the outlet /return Delta in parameter H605
(delivery/return Delta for output reduction). Therefore the
temperature setpoint is limited to the value of the return
temperature sensor + the outlet /return Delta.
The switching off value remains that of the setpoint set +
the switching off value.
Example: Set = 80°C, delivery = 40°C, return = 25°C; if
the delivery /return Delta = 20°C, then the setpoint is lim-
ited to 25°C+20°C = 45°C; increasing the return tempera-
ture increases the temperature setpoint. The switching off
value remains at 80+delta_switching off = 84°C.