16
Auxiliary microswitch
Event/condition
Value
DHW tapping in progress
1
Heating cycle in progress
2
Comfort cycle (pre-heating/recirculation) in progress
4
HIU OFF
8
Error not active
16
Error active
32
The HIU is equipped with a contact, driven by a relay incorporated in
the circuit board, the intervention logic of which can be programmed
in accordance with requirements by setting technical parameter t05.
Each event linked to operation of the HIU is linked to a numerical
value, according to the following table:
Closing of the contact on the occurrence of multiple events conditions
is programmed by setting parameter t05 to a value corresponding to
the sum of the single events/conditions.
We give some practical examples below:
example 1 - Driving an external primary flow pump, normally OFF.
The contact must be closed if any HIU function is active (DHW
production, heating, pre-heating)
Parameter t05 must be set to: 1 + 2 + 4 = 7
This value (t05 = 7) is
set by default
.
example 2 - Distinction of consumption for DHW production from
total consumption (in combination with heat meter equipped with
dedicated function)
The contact must be closed both if DHW tapping is in progress and if
activation of the comfort function is requested (pre-heating or
recirculation).
Parameter t05 must be set to 1 + 4 = 5.
Closing of the microswitch is shown on the user interface by the
symbols shown alongside.
N.B. if the DHW recirculation function is enabled with t02 = 1
(see page 13) the auxiliary microswitch intervention logic
described above is not operational. In this case, the contact is
used to control the recirculation pump.
N.B.: the auxiliary microswitch can be used to drive electric
loads directly, taking account of the following operating limits:
- Max voltage: 230 Vac
- Max current: 3 A
If the electric load to be controlled is not included within the
parameters indicated an external relay must be interposed.
Connection
For information on how to access the dedicated terminals, consult the
“auxiliary microswitch” section on page 19.
