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CAUTION
Do not short (jumper) across terminals on the gas
valve or at the system control to test installation.
This will damage the thermostat and void the war-
ranty.
Installation
NOTE − If this thermostat is replacing an existing thermo−
stat, carefully label the existing thermostat wires so that
they can be identified later.
1. If a previously-installed thermostat exists, remove it; if
none exists, identify the location for installation (locate,
or install wiring as necessary). To facilitate installation,
enlarge the hole where the thermostat wires protrude
through the wall to about 3/4" wide by 3/4" high.
2. Pull about 3 inches of the thermostat wiring through
the wall opening. Strip 1/4" of the insulation from the
ends of the thermostat wires.
3. Use a screwdriver to remove the thermostat subbase
from the body. Carefully pry the subbase away from
the body along the bottom edge of the subbase near
the two mounting snaps; then lift the subbase upward.
4. Use the subbase as a template to mark the desired
mounting hole locations on the wall.
5. Drill two 3/16" holes at the marked locations on the
wall. Insert the provided plastic wall anchors provided
into the holes. Press the anchors into the holes until
anchors are flush with the wall.
6. Align the subbase over the plastic anchors and secure
it to the wall using the provided screws.
7. Use a small slotted screwdriver to secure all wires to
the subbase terminal block. Make thermostat connec-
tions as follows:
L3511C − See table 1 and figure 1.
D
L3522C − See table 2 and figure 2.
D
L3532H − See table 3 and figure 3.
D
8. After wiring is complete, thoroughly seal the hole in the
wall with a suitable material to prevent unconditioned
air in the wall space from entering the thermostat.
9. Set the thermostat DIP switches as required for the
application. See table 4 for DIP switch settings.
10. Carefully attach the thermostat body to the subbase by
first engaging the hinges at the top of the unit, then piv-
oting the body downward until it snaps onto the sub-
base.
The thermostat is now ready for operation. Turn on
power to the thermostat and refer to the appropriate
5/2 Programmable Thermostat Operation Manual.
11. Remove the clear protective film from the face of the
thermostat display.
Note: After this film is removed, some dark streaks or
lines may temporarily appear on the display. These
are normal and should disappear within a few minutes.
506077−01 02/08
Removing Thermostat
The thermostat hinges on tabs on the top of the subbase.
After installation is complete, no tool is needed to remove
the thermostat from the subbase. Pivot the bottom of the-
thermostat outward (releasing the snaps), then lift up to re-
move.
Table 1. L3511C Terminal Designations
Terminal
Description
R
24VAC
Y1
First stage cooling
W1
First stage heating
G
Fan control
L
Service Indicator
C
24VAC common
Table 2. L3522C Terminal Designations
Terminal
Description
R
24VAC
Y1
First-stage cooling
W1
First-stage heating
Y2
Second-stage cooling
W2
Second-stage heating
G
Fan control
L
Service Indicator
C
24VAC common
Table 3. L3532H Terminal Designations
Term. Description
B
Reversing valve, heat active
O
Reversing valve, cool active
R
24VAC
Y1
First-stage cooling/heating, compressor
energized
W1*
Auxiliary heating, furnace energized
Y2
Second-stage cooling/heating, compressor
energized
E*
Emergency heat
G
Fan control
L
Service Indicator
C
24VAC common
T
Outdoor temperature sensor connection 1
T
Outdoor temperature sensor connection 2
* For most applications, E will be jumpered to W1. If sep-
arate wires are not provided for both E and W1, jumper
the E terminal to the W1 terminal on the thermostat sub-
base. For applications involving the use of a balance
point (whereby the outdoor temperature is to be used to
restrict either heat pump operation or backup heat
source operation), the optional outdoor sensor (part
number X2658) MUST be installed.
Page 2
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