Lennox LXTFZ01M Mode D'emploi page 54

readout is not accurate.
By changing the value of this parameter the display readout can be
corrected of the equivalent amount being this a value which is actually
added to the acquired temperature reading.
P13 and P14: These two parameters set the range of the setpoint
temperature when in heating mode. In details P13 is the lower limitd,
while P14 is the upper limit.
P15 and P16: These two parameters set the range of the setpoint
temperature when in cooling mode with the same logic as those in the
former step. When the heating/cooling mode is changed, the limits of the
setpoint temperature are automatically modified in turn.
P17: This parameter defines an anti-freeze temperature, that is a minimum
temperature which is maintained in the room even when the regulator is
turned off.
Regulation according to this temperature will only take place when the
regulator is set in heating mode; the fan speed will be limited to the lowest
one. Setting the value to 0.0°C (32°F) disables the anti-freeze function.
P18: This value defines the entity of a temperature reduction step (in °C o
°F) used to perform the "Economy" function.
The actual setpoint is therefore reduced (when in heating mode) or raised
(when in cooling mode) by this step, once the "Economy" function is made
active.
Setting this parameter to 0.0 the "Economy" function is always disabled.
P19: This parameter sets the hysteresis (in °C o °F) used in the room
temperature regulation process when on-off loads are used.
P20: In case the controller is configured for a neutral zone operation this
parameter determines the neutral zone amplitude.
P21: This parameter allows to set a delay time
(in seconds) from the valve opening to the fan turn-on, in order to allow
some time for the heat exchanger to heat-up or cool-down.
P22: This parameter allows to set a delay time (in seconds) from the
valve closing to the fan turn-off, in order to allow some time for the heat
exchanger or electric heater to dissipate the residual heat.
P23: This parameter defines the threshold above which the delivery
water is considered sufficiently hot for the cut-off temperature function
in heating mode.
In case this function is not wanted, set the parameter to zero.
P24: This parameter defines the threshold below which the delivery water
is considered sufficiently cold for the cut-off temperature function in
cooling mode.
In case this function is not wanted, set the parameter to 99.
P25: This parameter sets the time after which the "Dirty Filter Warning"
is shown; it can be set in the range 0..50 x 100h. As an example "10"
means that the warning will be shown after 10 x 100 = 1000 hours of
fan operation.
When set to 0 the function is disabled.
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LXTFZ01M-IOM-1502