35
ACCESSORIES
3.1: PERIODIC VENTILATION
If the control is installed on the machine and the fan is off because the thermostat function has been complied with,
there are fan
ON/OFF
cycles to allow the air probe to detect the effective temperature in the environment. This func-
tion is activated in both
heat
and
cool
mode.
HOT- START function:
The heat exchanger is pre-heated before the fan is activated. This function is only enabled in
heat
mode and takes
place in the two steps described below.
- Ventilation delay:
For control units with the valve thermostat action: there is a 180 second fixed delay between
activation of the heat governor and activation of the ventilating action to allow the valve to fully open. After 180
seconds, the ventilating action will still only start when the water probe detects a temperature of
39.5°C
or more.
This function is not available in control units with the fan thermostat action.
- Ventilation enabling:
The ventilating action will only start if the temperature of the water exceeds
39.5°C
. This
function is available in both control units with the valve thermostat action and in ones with the fan thermostat action.
Hysteresis graph of the thermostat action (valve or fan, depending on the type of control unit).
3.2: POST-VENTILATION
After the electric heating elements have been de-activated by the thermostat function, the ventilating action will con-
tinue for a further 90 seconds.
Graph showing the hysteresis of the thermostat action
Valve/ventilation ON
Water temp °C
Summary of Contents for TOP FAN
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