Temperature Setpoint Range; Fan Control - Lennox ComfortSense 3000 Series Operation Manual

Figure 18. Changing Fahrenheit/Celsius Setting
Temperature Measurement Range
Measurement Scale: Fahrenheit
Measurement Range: 35°F to 99°F
Measurement Resolution: 0.5°F
Measurement Accuracy: +/-1°F
Field Offset: via DIP switches to +/-3°F
Sampling Method: temperature measurements sampled
every 15 seconds. Displayed temperature is the average of
the last four measurements.

Temperature Setpoint Range

Setting range: 50°F (10°C) to 90°F (32°C)
Setting resolution: 1°F (1°C)
Smart Setback Recovery (via DIP switch #6)
Smart Setback Recovery (SSR) affects the way the
thermostat responds to program events. If SSR is disabled,
the thermostat will react to a program event at the time the
event occurs. However, if SSR is enabled, the thermostat
will react to a program event before the event occurs such
hat the desired temperature is reached at the time of the
event, not after.

Fan Control

AUTO or ON modes, gas or electric heat compatible via
DIP switches (also see Thermostat Output section).
I/O Relays
All thermostat relays are latching type to minimize power
consumption.
Table 4. L3511C Terminal Designations
Terminals
R
Y1
W1
G
L
C
Equipment Protection Timers
Minimum Compressor OFF time: 5 minutes
Minimum Compressor ON time: 4 minutes
Minimum Furnace ON time: 3 minutes
Descriptions
24VAC
First stage cooling
First stage heating
Fan control
Service Indicator
24VAC common
7
Minimum furnace cycle time (elapsed time between any
furnace activation and the next furnace activation): 6
minutes.
Minimum elapsed time between any compressor activation
and the next compressor activation: 6 minutes.
NOTE - All protection timers (except the compressor OFF
timer) can be over-ridden if a heating or cooling demand
is initiated or terminated using the UP, DOWN, HEAT, or
COOL buttons.
Equipment Protection Override
Both the minimum compressor OFF timer and the minimum
equipment cycle timer can be over-ridden by pressing
and holding either the HEAT or COOL button down for 4
seconds.
Over-Temperature Protection
Thermal-mechanical switch opens W1 at 93°F+/-6°F.
Filter Reminder
Settings of Off, 1, 3, 6 or 12 (months of fan run time) are
available. When programmed time has elapsed, a FILTER
indicator is displayed.
Maintenance Reminder
Settings of Off, 6 or 12 (months of chronological time)
are available. When programmed time has elapsed, a
maintenance indicator "MAINT" is displayed.
Service Reminder
The SERVICE indicator is displayed only under the following
conditions:
• if the thermostat Y1 terminal has been activated with
24VAC for at least 5 minutes, AND the L terminal is
shorted to the R terminal;
OR
• if the thermostat Y1 terminal has been activated with
24VAC for at least 5 minutes, AND the L terminal is
shorted to the C terminal.
Power Loss/Recovery
Thermostat memory is retained for a minimum of 24
hours during a power loss (includes retention of program
information, HOLD status, programmed temperature
setpoint, heat/cool and fan mode settings, filter reminder
status, maintenance reminder status, and equipment
protection timers). After 24 hours of power loss, programmed
settings will be lost and replaced with default settings.
IMPORTANT
Power must be applied for at least six consecutive hours
prior to a power loss in order for memory to be retained
for the specified time.
LCD Backlight
Activated for 30 seconds when any button is pressed.
NOTE: During an electrical storm or similar disturbance, the
back-light may activate for a few seconds. This is
normal and will no longer occur after the electrical
disturbance has passed.