Page - IOM / @DNOVA-µAC-0907-E
Free-cooling function
In shelter-type units, energy saving can be achieved using a
damper on the external air (output Y1 for 0-10Vdc or three-
point with outputs out3 and 4, or on-off type with output out3)
to control the free-cooling function, using the external probe
B2, and setting an activation temperature differential using the
parameter rL. In addition, this function is limited by setting a
set point rn for the supply temperature B4. For the operating
diagrams, see Fig. 6. The parameters to be selected are
Hc, rL and rn. The compressor alarms and PA alarm enable
the opening of the damper independently of the external
temperature.
Hd Function of probe B3
Enables probe B3 as humidity sensor or for the control of
condensation pressure.
0=
Humidity control
1=
Condensation control
Range: 0÷1 flag Def.:0
He on/oFF digital input
Enables the digital input ID1 as Remote ON/OFF. With the
input open the machine is in stand-by (signalled by the symbol
“OFF” on the display); applying, on the other hand, a voltage
of 24V the unit is turned on (signalled by the symbol “ON” on
the display).
0=
Absent
1=
Present
Range: 0÷1 flag Def.: 0
HF Logic of the alarm relay (out 6)
Selects the logic of the relay, normally energised or de-
energised, and the category of alarms which activate this
relay.
0=
Relay de-energised for all alarms
1=
Relay energised for all alarms
2=
Relay de-energised only for serious alarms
3=
Relay energised only for serious alarms
Range: 0÷3 flags Def.: 0
HG Delay on start-up
Sets the delay time on each switching from stand-by to ON
or POWERON. During this phase the green LED is on but all
actuators remain off.
Range: 0÷300s Def.:0
HH UseR password
Sets the value of the user password to access the User
parameters.
Range: 0÷200 Def.:22
Hi Keypad lock
Prevents non-authorised personnel from modifying the
parameters.
0=
no lock
1=
locks all parameter modification, alarm reset and hour
counter functions (except for access to the user password
and switching off via keypad); the lock symbol appears on
the display.
Range: 0÷1 flag Def.:0
HL Parameter sets
Allows various configurations of parameter levels (see table
of parameters at the start of chapter 6).
Range: 0÷3 flags Def.:0
Hn select data shown on display
Selects which values are shown on the display, in normal
conditions: temperature and humidity read by the probes or
the set point, or, if the clock board is present, the current time.
In the latter two cases, pressing the button shows the values
read by the probes.
0=
Probes B1, B3 (if present)
1=
Temperature and humidity set points (if present)
2=
Day and time (if clock present)
Range: 0÷2 flags Def.: 0
Ho supervisory network serial address
Sets the address of the device in the RS485 supervisory
network.
Range: 1÷200 Def.:1
HP supervisory network serial baudrate
Sets the line speed in the RS485 supervisory network.
1=
1200 Baud
2=
2400 Baud
3=
4800 Baud
4=
9600 Baud
5=
19200 Baud
Range: 1÷5 flags Def.: 5
Hr software version
Displays the software version of the µAC in the format n.nn.
DESCRIPTION AND CONFIGURATION OF THE PARAMETERS
