©2017 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
Shipping and Packing List
Shipped with Product
1 - Thermostat
2 - Plastic wall anchors
2 - Screws
1 - Operation manual
Optional Accessories (not included)
Remote indoor sensor: 47W37
Wall Plate: X2659
INSTALLATION INSTRUCTION
C0STAT05FF1L CS3000
Commercial Programmable
Thermostat
CONTROLS
507517-02
6/2017
Supersedes 507517-01
C0STAT05FF1L 5/2 Day Programmable
Thermostat
The Lennox ComfortSense® 3000 Series Commercial
Programmable Thermostat, Model C0STAT05FF1L
(11Y05) is a 5/2 day programmable and 2-heat / 2-cool
electronic thermostat. This thermostat is suitable for the
following Lennox Commercial systems:
Heat/cool systems (conventional)
Packaged heat pumps (2-20 tons)
Split heat pump systems (7-10 tons)
NOTE - Not for use with small 3-5 ton split heat pump
systems.
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It includes a programmable filter change reminder,
equipment maintenance reminder and a system check
indicator to notify the user when the equipment requires
service.
The remote indoor sensor when connected and configured
will act as a room temperature sensor instead of internal
temperature sensor available with the thermostat. The dip
switch is used to select either built-in or external remote
indoor temperature sensor used for temperature control.
WARNING
This product contains a chemical known to the State of
California to cause cancer, birth defects, or other
reproductive harm.
CAUTION
Do not short (jumper) across terminals on the gas valve
or at the system control to test installation. This will dam
age the thermostat and void the warranty.
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.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury
or loss of life. Installation and service must be performed
by a qualified installer, service agency or the gas supplier
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.
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5/2 DAY PROGRAMMABLE THERMOSTAT
Requirements
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.
Installation
NOTE - If this thermostat is replacing an existing
thermostat, 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 sub-base
from the body. Carefully pry the sub-base away from the
body along the bottom edge of the sub-base near the
two mounting snaps; then lift the sub-base upward.
4. Use the sub-base 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 sub-base 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
sub-base terminal block. Make thermostat connections
as described in table 1.
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 3 for DIP switch settings.
10. Carefully attach the thermostat body to the sub-base by
first engaging the hinges at the top of the unit, then
pivoting the body downward until it snaps onto the
sub-base.
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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 sub-base.
After installation is complete, no tool is needed to remove
the thermostat from the sub-base. Pivot the bottom of the
thermostat outward (releasing the snaps), then lift up to
remove.
Thermostat Terminals
On Lennox Commercial heat pumps listed below the
reversing valve is controlled by W1 through a transfer relay.
Commercial packaged heat pumps (2-20 tons)
Commercial split heat pump systems (7-10 tons)
NOTE - Not for use with small 3-5 ton split heat pump
systems.
Table 1. Terminal Designations
Terminal Description
R 24VAC
Y1 Compressor Stage 1 cooling
W1 Stage 1 heating (gas, electric or heat pump
heating on certain size and types
systems*.)
Y2 Compressor Stage 2 cooling
W2 Stage 2 heating (electric)
G Fan
L Service indicator
C Common 24VAC
T Remote Indoor Temperature Sensor
connection 1
T Remote Indoor Temperature Sensor
connection 2
OC Occupancy output (economizer)
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5/2 DAY PROGRAMMABLE THERMOSTAT
OC R Y1 W1 Y2 W2 G L C T T
Figure 1. Terminal Strip (11Y05)
DIP Switch Settings
DIP Switch Settings
This thermostat includes six DIP switches which are located
on the back side of the thermostat body. These switches
may be used to re-calibrate the thermostat (Cal 1, Cal 2 and
Cal±) and to select the internal or remote indoor
temperature sensor.
Thermostat includes a DIP switch used to indicate whether
electric or gas heat will be used. Also, SSR (Smooth
Setback Recovery) can be enabled or disabled. When
enabled, this feature provides additional comfort when
changing from one program period to the next. If SSR is
disabled, the HVAC equipment will respond to a program
change at the time the change is set to occur.
However, if SSR is enabled, the HVAC equipment will
respond to a program change before the change is set to
occur. Refer to table 3 for DIP switch function descriptions.
Thermostat Calibration
Cal 1, Cal 2, Cal± DIP switches may be used to offset or
recalibrate the room temperature display. Table 2 provides
DIP switch settings and corresponding temperature offset
values.
Table 2. DIP Switch Temperature Offset
Cal 1 Cal 2 Cal +/- Temperature Offset
Off Off Off +0°F (no offset)
On Off Off +1°F
Off On Off +2°F
On On Off +3°F
Off Off On -0°F (no offset)
On Off On -1°F
Off On On -2°F
On On On -3°F
Page 6
Table 3. DIP Switch Function Description
ID Dip switch Description Off On Default
1 Cal 1 Room temperature offset: 1°F 0°F 1°F 0°F
2 Cal 2 Room temperature offset: 2°F 0°F 2°F 0°F
3 Cal +/- Room temperature offset: Sign Positive Negative Positive
4 Temp Sensor (I/R) Select Int / Ext (Remote) for selecting
temperature sensor
Internal Remote Internal
5
Fan option (E/G) Select electric (E) or gas (G) heating fan operation G E G
6 SSR Enable or disable Smooth Setback Re
covery
Disable Enable Disable
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