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emmeti TAM-15 Manual De Instalacion Y Uso página 45

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The function is activated by setting the time-to-maintenance on parameter
P25. The thermostat will count the fan operation time and when the
threshold set in P25 (per 100 hours) is reached, the "
on the display. Once the filter has been cleaned, to reset the warning and
the time counter keep the " " button pressed for 10 seconds, until the
"
" filter icon disappears from the display.
TEMPERATURE REGULATION
This device can drive in a proportional way both valves and fan in order
to control room temperature with the highest comfort and energy saving.
Nonetheless each different environment needs a different set for some
parameters in order to get an accurate regulation.
Parameters responsible for the regulation accuracy are:
- Proportional band: C03 and C04
- Integral time: C05 and C06
For each of the settings two parameters are available, because the user
is allowed to set different values for heating and cooling mode. The
proportional band in °C or °F is the difference between the setpoint
value and room temperature that ensures the valve is fully opened by the
regulator and/or turns on the fan at the maximum speed.
The narrower the proportional band, the fastest is the regulator to
counteract temperature variations in the room. Yet a too "narrow" value
for this parameter can result in room temperature oscillations or system
instability.
A too "wide"value could result in the impossibility to reach the setpoint
temperature in the room. When the integral time is set to zero, no integral
action is made and therefore the regulation is purely proportional (P type).
When an integral time different from zero is set the resulting regulation is
made of a Proportional plus an Integral action (P + I type).
The smaller the integral time, the greater the influence of the integral action
and vice-versa: with a greater integral time the resulting integral action is
" filter icon blinks
softer. A too soft or null integral action could result in the impossibility
to reach the setpoint temperature, meanwhile a too strong integral
action could possibly generate oscillations in the room temperature. It is
necessary to adjust these parameters according to the actual environment
in which the regulator is installed to get the best regulation accuracy.
The proportional control of the valves can only take place when they are
controlled by the 0..10V outputs. Proportional control cannot take place if
using ON/OFF valves, they will be driven either always ON or always OFF
with hysteresis set on parameter P19.
The fan will be proportional driven only when it is set in automatic speed
(AUTO). The fan speed will be proportional regulated (P + I) even when the
fan motor is a three speeds one.
The distance between the three speed stages is calculated dividing by three
the proportional band and rounding down. For example if the proportional
band is 2°C (35,6 °F), the distance between stages will be 0.6°C (33,08 °F).
INSTALLER CONFIGURATION
Installer configuration defines the thermostat operation and allows to
adapt it to the different types of plants and systems. To access the
configuration menu, simultaneously press the " " e "" buttons for a
few seconds until "COn" (configuration) appears on the display.
Once entered in configuration menu, pressing " " scrolls through the
various parameters, identified with P and the parameter number, from
P01 to P25. The configuration end is displayed with "End". Press " "
again to save the configuration and and return to normal operation.
Press the " " button, at any time, to exit from the configuration menu
without saving the changes.
45

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