Lennox ComfortSense L3021H Operation Manual page 7

Table 2. L3021H Terminal Designations
Connections Description
O Reversing valve, cool active
B Reversing valve, heat active
R 24VAC
G Fan control
Y1 First stage cooling/heating,
compressor generated
W1 Auxiliary heating, furnace generated
L Service Indicator
C 24VAC common
E Emergency heat
T Outdoor temperature sensor
connection 1
T Outdoor temperature sensor
connection 2
Equipment Protection Timers
Minimum Compressor OFF time: 5 minutes
Minimum Compressor ON time: 4 minutes
Minimum Furnace ON time: 3 minutes
Minimum backup furnace cycle time (elapsed time be-
tween any furnace activation and the next furnace activa-
tion): 6 minutes.
Minimum elapsed time between any compressor activa-
tion 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 mini-
mum equipment cycle timer can be over−ridden by press-
ing 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 0 (Off), 1, 3, 6 or 12 months are available. When
programmed time has elapsed, a FILTER indicator is dis-
played.
Balance Point
0°F (OFF) to 55°F, user selectable.
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L3021H THERMOSTAT