Longo programmable controller LPC-2.P02
1 DESCRIPTION
LPC-2.P02 control panel special module is used for room temperature regulation.
Controller is equipped with temperature sensor, light intensity sensor and two push buttons:
“WARMER -
▲
” and “COOLER -
▼
”. To increase temperature set point “WARMER” push button is
used and to decrease “COOLER” push button is used. Temperature set point command or controller
switched off is represented with LED bar-graphs (refer to the Table 3). Light intensity sensor is
primary used for LED bar-graph intensity control, so LEDs do not disturb customer during the night if
desired.
LPC-2.P02 has many integrated settings and functions which allows adaptation to required system
and regulation diagram. Settings can be done and functions can be enabled or disabled using LPC
Manager software.
Maximum and minimum temperature set point range can be set to scale temperature set point.
Default range is between 18 °C and 24 °C.
If economic function is set, controller will start cooling when room temperature will raise above
max. temperature set point and stop when temperature will drop 1 °C below max. temperature set
point. On the other hand, when room temperature will fall below min. temperature set point
controller will start heating and stop when temperature will raise 1 °C above min. temperature set
point.
When four pipe (default) system is selected, controller will activate hot command when heating and
cool command when cooling is required. In case of two pipe system selection, hot command is
always activated when heating or cooling is required (depends on heating or cooling mode
selection). For example that two pipe system, cooling mode is selected and room temperature is
higher than temperature set point on the control panel, controller will activate cooling with hot
command (cool command is off if heating or cooling is required).
In case that balcony door and/or window function is enabled and door and/or window contact is
opened, valves for heating or cooling will be closed.
Frost protection function activates heat command when room temperature measured by the panel
drops below 5 °C. This function has priority over all control panel integrated functions.
LPC-2.P02 control panel is possible to switch off using off command is set from LPC Manager
software. In this case cool, heat commands are switched off. Cool and heat commands are also
switched off when temperature measured by the panel is inside dead band (default = 0.5 °C)
temperature values.
Control panel PI regulator output variable range is 0 to 10000. Values from 4999 down to 0
represents cooling and vales from 5000 up to 10000 represents heating.
Example: If proportional – P parameter (default = 25) is set to 1 and difference between measured
temperature and temperature set point is +1 °C, the control panel regulator output value will be
5100. On the other hand if the difference is -1 °C, the control panel regulator output value will be
4900.
If integral – I parameter (default = 5) is set to 1 and difference between measured temperature and
temperature set point is +1 °C, the control panel regulator output will increase every second by 100.
On the other hand if the difference is -1 °C, the control panel regulator output will decrease every
second by 100.
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