Heating/Cooling Selection - Lennox LXTFF01M Manual

APPENDIX

HEATING/COOLING SELECTION

Heating or cooling modes are selected by keeping the
button depressed for some seconds, until the display shows one of
the following texts which indicates the current mode:
 : Heating mode
 : Cooling mode
Then, by pressing the """ or "" or " ", the user can change the
desired mode, cycling between heating and cooling. Depressing
any of the other buttons results in saving the choice and quitting
the menu.
When the thermostat is confi gured for automatic or centralised
heating/cooling selection, the selection cannot be manually
changed and if tried, the display shows the fl ashing " " icon.
DELIVERY WATER SENSOR
This controller features an input for the delivery water temperature
sensor: when this sensor is installed the controller can automatically
understand whether it should be working in "cooling" mode or
in "heating" mode: this function is called "water temperature
changeover".
The water temperature is also used to perform the "cut-off
thermostat" function.
Alternatively a bimetallic thermostat can be wired to the input to get
the "cut-off" function.
EXTERNAL INPUTS - TERMINALS 3, 4 AND 16
The thermostat has three external inputs that can be associated to
different functions through parameters C14, C15 and C16.
Signals to terminals 3 and 4 can be connected to terminals 3 and 4
of other thermostats in the same building for centralised functions.
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The signal on terminal 16 cannot be connected
to other thermostats.
Functions that can be associated to the inputs are:
"menu"
"Centralised Heating/Cooling" function:
When installations have multiple thermostats in a single building,
the centralised inputs of each thermostat can be connected
together and controlled by the central heating room.
This way the central heating room determines whether the
thermostats must operate in the heating or cooling mode.
"Economy" function:
The input activates/deactivates the economy mode (see the
"Economy function" paragraph). This function can be associated
with the following icon: "
input status changes
and not to the level, so it is always possible to change the economy
status with the " " button (if enabled).
"Regulation stop" function
The input can suspend or reactivate room temperature regulation.
When temperature regulation is suspended the fan is stopped, the
valves remain closed and the relevant symbols on the display will
fl ash. This function can be associated with one of these icons: "
" or " " o " ". When an input is confi gured for the "regulation
stop" function and the "
performed. Connecting a window contact to the input, when the
window is open the "
temperature regulation will be suspended.
Note: there are limitations for window contact use. Carefully read
the paragraph "ATTENTION".
"Thermostat ON / OFF" function
The input turns the thermostat on or off, like pressing the " "
button. Since the thermostat is sensitive to input status changes
". The thermostat is sensitive to the
" icon, the "window contact" function is
" icon will appear on the display and the
LXTFF01M-IOM-1511