SATK22
16
IMPORTANT!
•
Any DHW production that occurs during the time band
(3:00 -3:30) will be at 60°C.
•
The cycle execution time band (3:00 - 3:30) is established
in accordance with the time set on the remote control unit.
Incorrect time setting will result in execution of the
anti-legionella function in a different actual time band.
Due to the effect of exchanger thermal inertia, temporary
DHW production at high temperature could proceed also
beyond the time of 3:30.
If the function is enabled thermostatic mixing valves should
be installed on the users level (washbasin/shower, etc.).
DHW Comfort Function - Pre-heat, DHW Re-circulation
The comfort function can be, alternatively, preheating of the
DHW plate heat exchanger or management of DHW
recirculation. They are enabled by setting to ON or PROG the
comfort function (see page 12).
DEFAULT SETTING: DHW exchanger preheating function
(parameter t02 = 0)
During periods when the domestic water
cycle is not used, if the DHW probe detects a temperature 10˚C
below the SET value, the regulator partially opens the domestic
hot water modulating valve for the time required (max. 5 min.)
to bring the exchanger to the condition wherein it can assure
rapid DHW production.
The active pre-heating cycle is indicated by the blinking
symbol. This function is of lower priority than any domestic
water or heating cycles.
OPTIONAL SETTING: management of DHW recirculation in the
apartment (parameter t02 = 1)
In alternative to the DHW comfort function it is possible to
manage DHW recirculation, using a similar logic. During
periods when the domestic water cycle is not used, if the DHW
probe detects a temperature 10˚C below the SET value, by
means of an auxiliary microswitch (see page 17), the regulator
closes the circuit supplying the circulation pump (not supplied)
generating a DHW cycle lasting for a pre-set amount of time.
This amount of time is pre-set to 2 minutes. It can be changed
by acting on parameter t09 on the technical menu (1 unit = 10
seconds).
The circulator has to be fed through the auxiliary microswitch
so that the control of recirculation is carried out by the heat
interface unit. DHW recirculation (t02=1) disables the other
functions operating on the auxiliary microswitch described on
page 17. Refer to page 17 for the electrical characteristics of the
microswitch.
Both comfort functions can be enabled according to user
defined weekly time programming. Refer to the remote user
interface manual
Anti-Legionella Function
DEFAULT SETTING: anti-legionella function OFF (technical
parameter t08 = 0)
Enabling the anti-legionella function by means of technical
parameter t08 = 1, in time band 3:00 - 3:30:
•
the DHW set point will be temporarily increased to the
maximum value (60˚C) - the comfort/recirculation function
will be forced ON.
As a result of the temperature rise of the set point, at time 3:00
a comfort function (either pre-heating or recirculation) will be
triggered, bringing the temperature to a value close to 60˚C,
such as to rapidly reduce the presence of any bacteria.
During execution of the cycle, the user interface display will
show the blinking symbol (refer to the adjacent figure).
