M23740N6-03 01/10/07
page
19
CONTROL
CONTROL
(FOR UNIT WITH CTS TERMINAL SPACE ELECTRONICS AND HID-T2 ,
HID-T3 , HID-TI2 THERMOSTAT)
21.0
REMOTE
ECO
AUTO
Ec
o
Sw
ing
LOCAL OR REMOTE MANAGEMENT
The unit can be managed locally from the thermostat or remotely through the use of a RS485 serial line with MODBUS
protocol.
ON
The unit can be switching on/off:
•
by thermostat
•
by digital input (set by parameter)
•
by net (set by parameter)
OPERATION
The unit has 2 set-points: one for heating and one for cooling. The first one is automatically kept lower than the second one
with a difference of at least 1°C.
The regulation module compares ambient temperature with the set-point and tries to keep it as close as possible to it;
therefore, it varies the fan speed, the water capacity or both of them according to the configuration.
The unit operating is enabled only if the water temperature:
•
in WINTER is higher than 30°C
•
in SUMMER is lower than 20°C
OPERATING MODES
AUTOMATIC
The modules automatically commute in cooling or heating mode.
The change occurs according to the input water temperature (2-pipe unit) or return air (4-
pipe unit.
Set the P31 parameter = 1
MANUAL
You choose manually if activating cooling mode
or heating mode
using the relevant
keys
Set the P31 parameter= 0
ECO
Economic operation, it prefers saving energy more than comfort
in cooling mode the setECO is higher than the standard set
in heating mode, it is lower
the deviation value is defined by P10 OffsetEco
MANUAL FAN
Fan speed is set manually;
however, the unit regulates the environment temperature according to the AUTO, MANUAL
or ECO modes
ANTI-TAMPERING
LOCK
Any attempt to change settings is prevented: the thermostat keys are deactivated.
CHANGE OF AUTOM ATIC M ODE – 2-PIPE UNIT
In this mode, a neutral zone is foreseen when the unit is positioned in a CHANGE OVER status for a time sufficient to probe
water temperature.
The status is displayed by a “CO” flashing.
After that time, if water temperature is out of limit, the H2O alarm is signalled.
Water temperature is detected (therefore, the cooling/heating modes are defined) only if power is demanded. In this operation
type, COOLING and HEATING sets are activated simultaneously; when one of the set is bypassed, water temperature is
detected and the mode is defined.
When thermo-regulator sets are met, the last operation mode is displayed.
The set that is the opposite to the actual one is determined internally by the regulator by a constant that is defined
ZoneChangeOver:
with unit in COOLING: set heating (opposite)= current set – ZonaChangeOver
with unit in HEATING: set cooling (opposite) = current set + ZonaChangeOver
