CLIMAVENETA a-CHD U-2T Serie Manual De Instalación Y Funcionamiento página 77

WALL-MOUNTED CONTROLS
DESCRIPTION OF FUNCTIONS
SUMMER mode of operation
The Summer mode is selected by setting the mode selector
on the relative symbol .
In this mode the resources are managed as follows:
- the summer mode valve is always ON;
- the winter mode valve is always OFF;
- the fans are always enabled according to the Too Cool
function and operate at the speed set with the fan speed
selector.
WINTER mode of operation
The Winter mode is selected by setting the mode selector
on the relative symbol .
In this mode the resources are managed as follows:
- the summer mode valve is always OFF;
- the winter mode valve is always ON;
- the fans are always enabled according to the Hot Start
function and operate at the speed set with the fan speed
selector.
AUTO mode of operation
The controller automatically selects the mode of operation in
relation to the type of plant selected:
- 2 pipes system: selects the mode of operation in relation
to the water temperature;
- 4 pipes system: selects the mode of operation in relation
to the air temperature.
AUTO fan mode
The controller will define the fan speed as much high as the
difference between the desired room temperature against
the current one.
Hot Start function
This function is available in the heating mode and it only
activates the fan if the water is hot enough. It is not available
if the heating element is installed.
Too Cool function
This function is available in the cooling mode, but only acti-
vates the fan if the water in the coil is cold enough.
CONFIGURATION OF THE ATW CONTROL
Analog inputs
Air sensor input included in ATW control:
- analog input used for temperature control.
Water sensor input (kit included):
- analog input used for measuring water or coil temperature;
- sensor length: 3000 mm;
- sensor position without valve: inserted in a copper bulb in
direct contact with the copper water pipe.
Digital outputs
YV1 Valve control (max 0,1 A).
This is used for opening the delivery valve and the conse-
quent water flow into the coil, as described below:
- 2-pipe system: the valve controls either the COOL circuit
or the HEAT circuit;
- 4-pipe system: the valve controls just the COOL circuit.
Place the water probe on the hot water coil.
YV2 Valve or heating element control (max 0,5 A).
This is used to govern according to the application:
- 2-pipe system: the control or additional heating elements;
- 4-pipe system: the delivery valve of the HEAT circuit.
Digital inputs
Digital inputs configurable is available:
- window contact: contact close, stop cooling/heating func-
tion.
- economy contact: contact close, the set point increases in
cooling mode or reduce in heating mode to obtain energy
saving;
- remote summer/winter: remote changeover heating or
cooling mode.
Dip Switch
5 dipswitches (DS) are available so that the installer can set
type of the system. All the thermostats have the 5 DS in the
OFF position by DEFAULT.
For further information see the instruction sheet on the com-
mand board.
Failure display
When the ventilation is inhibited by inadequate temperature
mode of operation required and there is a request for ther-
moregulation, led associated with the request flashes.
Temperature sensors failure. If the ambient temperature
sensor is damaged, led for selected mode of operation win-
kles with the sequence: 1 flash and pause for 3,5 sec.
If the heat exchanger temperature sensor is failure (short-
circuit), led for selected mode of operation winkles with the
sequence: 2 flashes and pause for 2,5 sec.
Window contact standy. If the entry ID1 is activated and
configured as a contact window, the decommissioning
expenditure is reported by the flash led corresponding to the
mode of operation and intensity of ventilation required.
Reduce leds' brightness
While pressing the keyboard mode of operation for at least 2
sec, causes halving or restoring indicator lamps' brightness.
User
35
EN