MAXA HWA1-A 0140, Manual

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HWA1-A
Air/water chillers with axial fans
15
In case you want to produce gelid water, it is necessary to modify the actions of antifreeze resistances, as well as the set of
activation of the antifreeze alarm (
A08 = 4°C by default) and its hysteresis ( A09 = 3.0°C by default).
12 REMOTE ON/OFF CONTROL
The ON/OFF function is already enabled by default. Remove the bridge of the terminal block then the unit will be placed in stand-
by mode (in such status the display of the on-board unit controller will show the "
E000 " code). When the contact is closed, the
machine exits from standby mode and the circulation pump will run for 2 minutes.
To modify this function, enter at the parameters PRG
→
PSS
→
PRG
→
(introduce the maintainer password)
→
PRG
→
PAr
→
PRG
→
CnF.
See paragraph 17.2.
Parameter Unit Value Description Terminals Notes
H47 Num
2
(default)
Remote On/Off digital input ID3-ID3 Voltage free digital input
13 SIGNALIZATIONS FOR HWA1-A MODELS
In cooling-only versions, on the DO7 - DO7N terminals (Parameter H85 ), you can set a 230Vac signal output voltage by setting the
following user parameters by entering the installer password in the control panel that is situated on the front panel.
Values Description
21
Signalization of defrosting period
•
The digital output is activated at the beginning of defrosting cycle, once the Pa d06 time period has terminated
•
The digital output is deactivated at the end of defrosting cycle, once the Pa d07 time period is terminated.
24 Signalization heat pump alarm
31
Signalization plant season.
•
The output is active in COOLING operation
•
The output is not active in heating operation
•
The output is not active when the unit s OFF.
During the DHW production and defrosting cycle, the output keeps the settings of the provenance season.
47
The output is activated if one the below alarms is active with the following conditions must be fulfilled:
Alarm Recovery condition
E001 Manual
E002 Manual
E005 Manual
E006 Manual
E008 Manual
E018 Automatic
E041 Manual
E101 Automatic
E102 Automatic
Sensor error Automatic
13.1 Machine lockout signalization
You can configure a digital output for the machine lockout warning. One of the DO must be configured with the value 47 in order
to enable this type of output.
The output switches will be activated if one of the following alarms is active with the following conditions:
14 OTHER CONTROL FUNCTIONS WITH THE PLANT MANAGEMENT GI-MODULE (optional)
The presence of GI optional plant management kit allows you to get a third controller located inside the electrical board acting as
an I/O ports expansion module. By mean of this last controller, it is therefore possible to increase the number of logic functions
that can be managed by the main controller; in particular, these logic functions concerns the plant management, as described
below. The following functions can be activated by the on-board controller which is located on the front panel of the unit.
14.1 Free-cooling
The free-cooling function allows the pre-cooling of the plant return water using air heat exchanger if allowed by the climatic
conditions. The function is active in cooling mode.
Herein below is reported the chart showing the free-cooling activation demand based on the outdoor and intake temperatures: