Lennox ComfortSense L3511C, ComfortSense L3522C, ComfortSense L3532H, ComfortSense 3000 Installation Instructions Manual
INSTALLATION
E2008 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
L3511C/L3522C/L3532H 5/2 Day
Programmable Thermostats
The Lennox ComfortSenset 3000 Series 5/2 day programmable electronic thermostats provide excellent temperature control and have a large, easy to read display.
Also provided is a programmable filter−change reminder,
an equipment maintenance reminder, and a system check
indicator. The system check indicator will notify the user
when the equipment requires service.
Thermostat model L3511C is suitable for non-heat pump,
single stage heat/single stage cool applications using a
gas or electric furnace.
Thermostat model L3522C is suitable for non-heat pump,
two-stage heat/two-stage cool applications using a gas or
electric furnace.
Thermostat model L3532H is suitable for heat pump,
three-stage heat/two-stage cool applications using a gas
or electric auxiliary heat source. An optional outdoor temperature sensor provides auxiliary heat lockout, balance
point operation, and dual−fuel compatibility.
General
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
INSTRUCTIONS
ComfortSenset 3000 Series
Models L3511C/L3522C/L3532H
5/2 Day Programmable
Thermostats
CONTROLS
506077−01
02/08
Supersedes 505,051M
Table of Contents
5/2 Day Programmable Thermostats 1. . . . . . . . . . . . .
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . .
Requirements 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat Operation 3. . . . . . . . . . . . . . . . . . . . . . . . . .
DIP Switch Settings 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Diagrams 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List
Shipped With Product
1 − Thermostat (L3511C, L3522C, or L3532H)
2 − Plastic Wall Anchors
2 − Screws
Optional Accessories
Outdoor Sensor (Used with L3532H only): X2658
Wall Plate: X2659
Requirements
Litho U.S.A.
IMPORTANT
Read all of the information in this manual before using
this thermostat.
All wiring must conform to local and national building
and electrical codes and ordinances.
This is a 24VAC low−voltage thermostat. Do not install
on voltages higher than 30VAC.
Be sure that power routed to the thermostat has been powered off before beginning installation.
This thermostat should be used only as described in this
manual.
Do not install the thermostat on outside walls (where there is
unconditioned space on opposite side of wall) or in locations
where direct sunlight may be present.
Install thermostat about 5 feet up from the floor.
02/08 506077−01
*2P0208* *P506077-01*
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 warranty.
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 connections as follows:
D L3511C − See table 1 and figure 1.
D L3522C − See table 2 and figure 2.
D L3532H − See table 3 and figure 3.
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 pivoting the body downward until it snaps onto the subbase.
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.
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 thethermostat outward (releasing the snaps), then lift up to remove.
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 separate wires are not provided for both E and W1, jumper
the E terminal to the W1 terminal on the thermostat subbase. 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.
506077−01 02/08
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