19
i-32V5
Pompe di calore inverter aria/acqua con ventilatori assiali
control.
10.3.2
SUMMER/WINTER MODE CHANGE
The function can be set on digital input ID 2 (terminals X16.1/X16.2).
Heating or cooling mode of the heat pump can be managed by remote control.
I/O resource - Parameter
Value
Function
ID2 can be activated via H46
3
Open contact -> heat pump in cooling mode.
Closed contact -> heat pump in heating mode.
The poles of the digital input can be swapped by setting H75 = 2
10.3.3
DHW CALL FROM DIGITAL INPUT
Function which can be activated instead of managing the double setpoint.
If DHW mode is enabled, instead of using the temperature probe, the domestic hot water function can be activated by the opening/closing of
a digital input on the unit. This function is recommended when using two or more heat pumps in cascade hydronically connected to the same
domestic hot water storage tank; this way activation of the domestic hot water function is controlled by the tank probe connected to the first
unit, while the other units are enabled automatically by digital consent.
The system goes to sanitary mode when the digital input closes and exits DHW production when it opens.
I/O resource - Parameter
Value
Function
ID9 can be activted via H53
28
Closed contact -> active DHW call.
Open contact -> inactive DHW call.
The poles of the digital input can be swapped by setting H76=1
The SAN setpoint of the heat pump is not considered, the designer is in charge of managing this setpoint, taking into account domestic hot
water protection and configuration of the entire system.
10.4
SYSTEM WATER REMOTE PROBE
In some engineering solutions (e.g. heat pump in parallel to boiler on same hydronic circuit and shut off diverter valve) it could be necessary to
enable a system temperature probe so that the controller can correctly process the management.
I/O resource- Parameter
Value
Description
ST7 can be activated via H18
41
Enables plant remote probe
The plant remote probe controls the temperature of the heat pump only during the compressor start-up phase. Shutdown is managed by the
probe on the heat pump delivery line.
The table below illustrating operation of the system helps to understand this concept:
Operating mode
Heat pump call active
heating
Temperature detected by the heat pump delivery probe <
Hea
setpoint -
0.5°C
and
Temperature detected by system remote probe <
Hea
water setpoint -
b22
cooling
Temperature detected by the heat pump delivery probe >
Coo
s
0.5°C
and
Temperature detected by system remote probe >
Coo
se
b22
Nota
: b22=5°C. See paragraph 13.
10.5
AUXILIARY HEATERS
In certain engineering solutions, it could be necessary to use an additional heater for the plant or for domestic hot water.
Parameter
r24
must be set to define the operating mode of the additional heaters:
-
r24=0
integration heaters not used;
-
r24=1
only plant integration heater used;
-
r24=2
only DHW integration heater used;
-
r24=3
both plant and DHW integration heaters used.
10.5.1
PLANT HEATER
If the regulation temperature remains below
water setpoint in heating (Hea) – 0.5°C
for a time equal to
r12
the integration heater is activated
according to operation of the machine in joint time slots or in substitution, as indicated in Paragraph 10.11.
The heater switches off when the setpoint is reached (also taking into account an offset set with parameters
r29
or
r30
).
If the regulation temperature remains below the
water setpoint minus r11
(°C) and the machine is blocked due to triggering of an alarm, the
heater switches on. It switches off when the machine exits the alarm block.
I/O resource - Parametro
Value
Function
r10
1
Function enabling
