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Removing and Installing Thermostat
The thermostat hinges on tabs on the top of the subbase;
no tool is needed to remove the thermostat from the sub-
base. Pivot the bottom of the thermostat outward (releas-
ing the snaps), then lift up to remove.
To install it, first position the top tilted toward the wall brack-
et and align it until you feel the tabs and slots engage; then,
while the top is in place, pivot the bottom toward the wall
until the thermostat snaps into place.
Thermostat Output Table
Table 2 depicts the L3722C thermostat output states for
various input conditions. The following notes described
terms used in the table.
Table 2. Thermostat Outputs
Condition
Gas Heat, Auto Fan
Heat Demand, SMALL
Heat Demand, LARGE
Cool Demand, SMALL
Cool Demand, LARGE
No Demand
Gas Heat, Continuous Fan
Heat Demand, SMALL
Heat Demand, LARGE
Cool Demand, SMALL
Cool Demand, LARGE
No Demand
Electric Heat, Auto Fan
Heat Demand, SMALL
Heat Demand, LARGE
Cool Demand, SMALL
Cool Demand, LARGE
No Demand
Electric Heat, Continuous Fan
Heat Demand, SMALL
Heat Demand, LARGE
Cool Demand, SMALL
Cool Demand, LARGE
No Demand
NOTE − X = output is activated with 24VAC.
NOTE − The temperature ranges expressed in the following def-
initions of SMALL/LARGE" demands are for guidance only; ac-
tual temperatures may vary.
With a SMALL heat demand, temperature is:
setpoint –0.5F
below
AND 30-minute upstage timer HAS NOT expired.
With a LARGE heat demand, temperature is:
setpoint –1.5F
less than
OR 30-minute upstage timer HAS expired.
With a SMALL cool demand, temperature is:
setpoint +0.5F
above
AND 30-minute upstage timer HAS NOT expired.
With a LARGE cool demand, temperature is:
setpoint +1.5F
above
OR 30-minute upstage timer HAS expired.
W1
W2
Y1
Y2
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
setpoint –1.5F
but above
setpoint +1.5F
but below
Default Thermostat Settings
Default thermostat settings are in table 3 and the default
program is shown in table 4.
Table 3. Default Thermostat Settings
Mode
Heat Setpoint (Perm Hold)
Cool Setpoint (Perm Hold)
Fan
Filter Reminder
Maintenance Reminder
Equipment Protection Timers
Autochangeover
Table 4. Default Program Settings (Time/Temp)
Programs
All days − A
G
All days − B
All days − C
All days − D
X
Technical Specifications
X
Thermostat Type
stat for 2−Stage (gas or electric) Heat/2-Stage Cool, non−
heat pump, non−power robbing applications.
X
Table 5. L3722C Terminal Designations
X
Terminal
Description
X
R
24VAC
X
Y1
First-stage cooling
X
W1
First-stage heating
Y2
Second-stage cooling
X
W2
Second-stage heating
X
G
Fan control
X
L
Service Indicator
X
C
24VAC common
T
Outdoor temperature sensor connection 1
T
Outdoor temperature sensor connection 2
X
X
Power Supply Range
X
nal), 60Hz
X
X
24VAC is present on the terminals of the thermostat
bracket. If removing the thermostat from the wall,
use caution and avoid touching any of the connec-
tor terminals on the wall bracket.
Also, when working with the thermostat dip
switches, use a non−conductive tool and take cau-
tion to avoid making any contact with the circuit
board, its imprinted circuitry and its connector
prongs.
Temperature Display
Celsius user selectable (via DIP switch; see figure 18)
Display range
Display resolution
Display Accuracy
Page 7
Heat (Perm. Hold)
70°F (or 21°C)
78°F (or 26°C)
Auto
OFF
OFF
Reset Back to Zero
OFF
Time
Temp.− Heat
6:00am
70_F / 21°C
8:00am
62_F / 17°C
6:00pm
70_F / 21°C
10:00pm
62_F / 17°C
Electronic programmable thermo-
18VAC − 30VAC (24VAC nomi-
CAUTION
Display Scale: Fahrenheit or
. . . . . . . . . . . . .
35°F (2°C) to 99°F (37°C)
. . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
L3722C 7−DAY PROGRAMMABLE THERMOSTAT
Temp.− Cool
78_F / 26°C
85_F / 29°C
78_F / 26°C
82_F / 28°C
1°F (1°C)
+/−1°F
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