32
ACCESSORIES
Valve management includes an ON/OFF control with valve shut signal when the set-point has been reached accor-
ding to the hysteresis cycles of the heating/cooling graphs. The valves required are the normally closed type with
endothermic actuators and opening/closing times of approx. 3 minutes.
The fan is managed with the time settings described in the VENTILATION CONTROL section in order to keep the
ambient temperature constantly monitored.
THERMOSTAT MODE HYSTERESIS:
The hysteresis value is 1°C for the controls on the machine and 0.6°C for the wall-mounted controls.
Position of the water probe
2.3: ELECTRIC HEATING ELEMENTS
Electric heating elements can only be used with the upgraded thermostat in the configuration with 2 pipes. The elec-
tric heating elements can operate either in substitution or as an integration:
- HEATING ELEMENTS IN SUBSTITUTION: Heating is only obtained with the heating elements. In this case, the
output of the 2nd valve is now used to pilot a bank of electric heating elements using a suitable relay. After the hea-
ting elements have been turned off, there is a post-ventilation phase lasting 90 seconds to allow them to cool down.
- INTEGRATED HEATING ELEMENTS: The heating element and the valve operate together. Heating occurs with:
the heating elements if the H
2
O temperature is less than 39°C; with the water, if the temperature is 39.5°C or more,
with a central hysteresis of 1°C (±0.5°C) in relation to the 39°C.
Heating regulation with electric heating elements
Water temp.
Operating
hysteresis
Temperature
Heating elements in sobstitutions
Valve always off
Integrated heating in sobstitutions
SEE NOTE
Water at 39.5° C
Water at <39.5° C
Water at 41° C
Temperature
Operating
hysteresis
Heat mode operation
Cool mode operation
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