Lennox SignatureStat 81M26, SignatureSu0001tat 81M27, SignatureSu0001tat 81M28 Programming And Application Manual
Page 1
E2007 Lennox Industries Inc.
Dallas, Texas, USA
Table of Contents
SignatureStatt Thermostat 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Date Code & Serial Number 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Home Screen & Main Menu 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming the Thermostat 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heating and Cooling Cycles 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Humidification 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dew Point Control 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dehumidification 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Humiditrol® Accessory 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing Time of Day / Day of Week 11. . . . . . . . . . . . . . . . . . . . . . . .
Cycling the Fan 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User Settings and Options 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change Temperature Settings 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting Vacation Mode 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installer Settings 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Outdoor Sensor 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Lights 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Protection 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EPA ENERGYSTAR® Recommended Setpoints 21. . . . . . . . . . . . . . .
Resetting Program to Factory Conditions 21. . . . . . . . . . . . . . . . . . . . .
Thermostat−specific Information 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flow Diagrams 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Diagrams 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PROGRAMMING AND
APPLICATION GUIDE
SignatureStatt Thermostat
CONTROLS
505,232M
06/07
Supersedes 2/07
81M26 shown
NOTE − This thermostat is equipped with automatic compressor protection
to prevent potential damage due to short cycling or extended power outages. The short cycle protection provides a 5−minute delay between heating or cooling cycles to prevent the compressor from being damaged.
Shipping and Packing List
1 − SignatureStatt thermostat
1 − Outdoor temperature sensor
Litho U.S.A.
505232 06/07
Page 2
WARNING
Always turn off power at the main power source by unscrewing
fuse or switching circuit breaker to the OFF position before installing, removing, or cleaning this thermostat.
WARNING
All wiring must conform to local and national building and electrical codes and ordinances.
WARNING
Do not switch system to cool if the temperature is below 45°F (7°C).
This can damage the cooling system and may cause personal injury.
CAUTION
This is a 24VAC low−voltage thermostat. Do not install on voltages
higher than 30VAC.
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.
IMPORTANT
Commercial use of the SignatureStatt thermostat can only be with
approved split-system matches, and which meets the following
installation criteria:
S installation uses 18 GAUGE thermostat wire or larger,
S thermostat wire run length DOES NOT EXCEED 300’ (91m),
S load from any thermostat connection is LESS THAN 1 AMP.
Connect outdoor sensor (if used) to the thermostat using separate
twisted-pair cable, 22 awg min., 300’ (91m) max., Lennox cat. no.
84X49 (1000’ roll) or X3790 (500’ roll).
If used with Harmony II® Zone Control System, consult Application
Note H−04−5.
IMPORTANT
Read this manual before programming this thermostat.
Use this thermostat only as described in this manual.
SignatureStat t Thermostat
The fully programmable SignatureStatt thermostat offers all of the features of a high−performance thermostat. It also offers enhanced capabilities
which include humidification measurement and control, dew point adjustment control, dehumidification measurement and control, Humiditrol® capability, and equipment maintenance reminders.
The 24VAC thermostat also features worry−free memory storage and a
menu−driven display.
This document supports the following products:
S 81M26 − 1 stage heat / 1 stage cool, conventional or heat pump (When
configured for a single−stage heat pump, no auxiliary backup heat is
supported.)
SignatureStat t Thermostat
Page 3
S 81M27 − 2 stage heat / 2 stage cool, conventional
S 81M28 − 2 stage heat / 2 stage cool, heat pump (Provides 2 stages of
heat pump cooling and one stage of heat pump heating. A second−
stage of auxiliary backup heat is also provided.)
S 46M98 − Outdoor temperature sensor (included with thermostat)
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.
Date Code & Serial Number
The date code and serial number are on the back of the SignatureStatt
thermostat (shown in figure 1). Date code identifies when the thermostat
was manufactured; serial number uniquely identifies each thermostat for
tracking purposes.
Figure 1. Date Code and Serial Number
DATE
CODE
(0411)
SERIAL
NUMBER
(02634)
(BACK OF
SignatureStat t
THERMOSTAT)
Features
Outdoor Temperature Sensor
The outdoor sensor is provided as a standard component of each SignatureStatt thermostat. In addition to measuring and displaying outdoor tem-
perature, the outdoor sensor provides dew point adjustment and control for
all models. It can also be used with the multistage heat pump thermostat
(81M28) to provide optimal heating equipment operation via programmable
balance points.
NOTE − Outdoor sensor must use twisted pair wiring (Lennox Cat, No.
84X49 [1000’] or X3790 [500’]).
When an outdoor sensor is connected,
the temperature is displayed on the
LCD at the right hand side. For example, the display will show OUTSIDE
90" if the outdoor temperature is measured to be 90°F.
NOTE − For proper operation of Humiditrol
®
applications, the outdoor sen-
sor MUST be installed.
L" Input
"L" input from the equipment is used to notify the user if the equipment fails.
The "L" terminal is connected to common through a resistor, LED, and voltage regulator. The CHECK LED is illuminated when 24 VAC is applied to
the L terminal. Nothing is displayed on the user interface screen.
Compressor Short Cycle Protection
A 5−minute compressor short cycle protection timer begins when a compressor output is de−energized.
MONDAY 3:29 PM
AUTO
FAN AUTO
SET AT 78
OUTSIDE 90
27%RH
HOLD TEMP MENU
78
ºF
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Home Screen and Main Menu
The home screen displays the present time, indoor temperature, indoor relative humidity, and outdoor temperature (if the outdoor sensor is installed).
To access the main menu screen, press the menu button on the home
screen (see figure 2).
MENU
BUTTON
Figure 2. Home/Main Menu Screen
UP/DOWN
BUTTONS
Main menu options
The main menu includes eight options, displaying four options at a time.
Press the DOWN arrow button to see the remaining options (see figure 3).
Press SELECT to choose the option you wish to program. All menus will
time out" after 20 seconds; therefore, the previous menu will be displayed if
you fail to select an option within 20 seconds.
MAIN MENU
PROGRAM
HEAT / COOL
HUMIDIFY
DEHUMIDIFY
HOME SELECT
MAIN MENU
DAY / TIME
FAN
USER SETTINGS
INSTALLER SETTINGS
HOME SELECT
Figure 3. Main Menu
Programming the Thermostat
Program the thermostat by choosing an event. An event is the beginning of
a programming period. The default number of events per day is four. The
thermostat may be programmed for two or four events per day. The names
for the events are: WAKE, MORN, EVE, and NIGHT. The time for an event
is selected based on when you want the event to occur. Four events are
common for working households.
Programming may be performed in groups of days or individual days, as
follows:
MON TO SUN − allows every day to be set the same.
MON TO FRI − allows for weekday programming.
SAT TO SUN − allows for weekend days to be adjusted separately.
MONDAY through SUNDAY − allows individual days of the week to be
programmed separately.
NOTE − After using one of the groups of days described above, the
program does allow you to subsequently change individual days to
suit your needs.
SignatureStat t Thermostat
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Programming for Full Week or Work Week
The programming process for MON TO SUN, MON TO FRI, and SAT TO
SUN is identical.
Full WeekThe least complex program is the full week MON TO SUN"
program, wherein the events for every day of the week are the same. If this
is chosen, follow steps 1 through 6, below, setting time and temperature for
each event. One time through all the events completes the programming
process.
Work WeekNext in complexity to the full week program is the work week
program wherein the events are set for a typical work week (MON TO FRI)
and different events are set for the weekend (SAT TO SUN). If MON TO FRI
is chosen, follow steps 1 through 6, below, setting time and temperature for
each event. Then repeat the same process for SAT TO SUN to complete
the programming process.
1. From the home screen, press MENU. Use the Up or Down button to
highlight PROGRAM. Press Select.
2. Select the appropriate time span
from the program days list. For
this example, choose the MON
TO SUN program days and press
Select.
3. Use Up/Down buttons to select
the event to program. The unit
can be set for two or four events
per day. After choosing an event
to program, press select. See
User Settings" for Events Per
Day selection.
4. The time for the first event should
be highlighted. Use the UP or
DOWN button to change the time.
Press SET TIME.
5. The heating setpoint for the first
event is highlighted. Use the UP
or DOWN button to change the
desired temperature. Press SET
HEAT.
6. The cooling setpoint for the first event will be highlighted. Use the UP
or DOWN button to change the desired temperature. Press SET
COOL. The next event, e.g. MORN will then be highlighted. Continue
programming until all event times and heat/cool settings are set as
desired.
Programming Day-by-Day
Individual day programming, MONDAY through SUNDAY, is done similar
to full week or work week. However, with this mode, a down arrow" appears next to the SELECT. Using the down button, an additional option is
available, COPY. After programming events for a selected day, for example
MONDAY, you can select COPY. Another screen with the remaining days
of the week appears. Use the up/down arrow buttons to scroll to another
day, for example, THURSDAY, and press YES/NO. YES will appear next to
THURSDAY. (Another press of the YES/NO button clears the YES" display [toggles back to NO]). Do this for each day to which you want to copy
the individual day’s program.
SELECT PROGRAM DAYS
MON TO SUN
MON TO FRI ⎮
SAT TO SUN ↓
MONDAY
MAIN MENU SELECT
MON−SUN PROGRAM
HEAT COOL
WAKE 6:30 AM 70 78
MORN 8:30 AM 62 85
EVE 4:30 PM 70 78
NIGHT 10:30 PM 62 82
MAIN MENU SELECT
MON−SUN PROGRAM
HEAT COOL
WAKE 6:30 AM 70 78
MORN 8:30 AM 62 85
EVE 4:30 PM 70 78
NIGHT 10:30 PM 62 82
BACK SET TIME
MON−SUN PROGRAM
HEAT COOL
WAKE 6:30 AM 70 78
MORN 8:30 AM 62 85
EVE 4:30 PM 70 78
NIGHT 10:30 PM 62 82
BACK SET HEAT
505232 06/07
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Heating and Cooling Cycles
NOTE − AUTO CHANGEOVER will appear in the HEAT/COOL menu only
if enabled via Installer Settings."
GO TO: MENU > INSTALLER SETTINGS > AUTO CHANGEOVER > ENABLE [SELECT]
1. From the home screen press
MENU. Use the UP or DOWN
buttons to highlight HEAT/COOL.
Press SELECT.
2. Use the UP or DOWN buttons to
highlight HEAT, COOL, or AUTO
CHANGEOVER. Press SELECT.
Pressing SELECT will turn on or
off the selected cycle.
You do not have to turn off HEAT to turn on COOL. When HEAT or
COOL or AUTO CHANGEOVER is turned on, all others are
automatically shut off. After pressing SELECT, the home screen will
automatically appear.
Determining if Heating or Cooling is ON
The thermostat display indicates the operating mode, HEAT, COOL, or
AUTO. When the indoor temperature decreases or increases, the HEATING or COOLING cycle will turn on based on the displayed mode. When
the HVAC system is on, LEDs along the bottom of the thermostat housing
will turn on.
Humidification
Humidification is provided only when the thermostat is in heat mode. The
humidification signal (H terminal) to the humidifier is off when the thermostat is in the COOL mode.
The H terminal controls humidification. When the thermostat is powered,
the H terminal is normally inactive (open circuit) in any mode (HEAT,
COOL, OFF). When a humidification demand is present, H terminal and G
terminal are energized (24V).
Also while humidification is occurring, a small water drop icon with a +"
symbol inside (shown in margin) is displayed on the screen.
The default humidification setpoint is 45% Relative Humidity (RH). The default mode for humidification is OFF and needs to be activated during installation.
Humidification Modes
In BASIC mode, humidification occurs if these conditions are met and signals are present at specific terminals:
S humidification mode has been enabled, and
S the unit is in HEAT mode, and
S humidification demand exists (24V present at H), and
S heat demand exists (W energized [for gas heat, W may be energized
with G de−energized]).
In PRECISION mode, humidification occurs (with or without a heat demand) when:
S humidification has been enabled, and
S the unit is in HEAT mode, and
S humidification demand exists (24V present at H).
NOTE − The D terminal is inactive (reverse logic, the terminal is powered)
during humidification. For complete terminal descriptions, see tables 3, 5,
and 7, on pp 22 and 23.
MAIN MENU
PROGRAM
HEAT / COOL ⏐
HUMIDIFY ↓
DEHUMIDIFY
HOME SELECT
HEAT / COOL SETTINGS
OFF
HEAT
COOL
AUTO CHANGEOVER
MAIN MENU SELECT
+
SignatureStat t Thermostat
Page 7
Adjust Humidification Level
1. NOTE − Basic or precision mode
must be turned on before you can
adjust the humidification level on
the thermostat. From the home
screen press MENU.
2. Use UP/DOWN buttons to highlight HUMIDIFY. Then press SELECT to choose MODE.
3. By default, humidification is OFF;
turn on by selecting BASIC or
PRECISION for humidification
mode (modes are described
above).
4. The HUMIDIFY MENU appears.
The mode, shown as BAS (basic)
is displayed on the right−hand
side of the screen.
5. Use the UP/DOWN button to
highlight HUMIDIFY; press SELECT.
6. In the HUMIDIFY CONTROL
screen, use the UP/DOWN buttons to adjust the desired relative
humidity. At the desired level,
press SELECT.
The humidification adjustment control may be adjusted in 1 percent
increments; dew point range. Setting limits: Min. 15%, Max. 45%. Default setting: 45%.
Humidifier Maintenance Interval
The humidifier maintenance interval is a fixed (cannot be changed),
6−month interval that is measured when the thermostat H terminal is active.
The HUMIDIFIER MAINTENANCE screen will be displayed after the H terminal has been active for a total elapsed time of 6 months (or 4,368 hours).
For example, if the interval timer started 2 days ago, the H terminal was active for 3 hours yesterday and 4 hours today; so far the H terminal has been
active for 7 hours. Another 4,361 hours, during which the H terminal is active, must elapse before the HUMIDIFIER MAINTENANCE screen is displayed.
When the interval has expired, the
screen will appear as shown to the
right. Press DELAY to be reminded later or RESET to reset the interval. The
delay lasts for two hours.
Humidification Sensor Fault
If the reading from the humidification sensor is out of range, then the H terminal becomes inactive, the D terminal goes to 24V, and the humidification
reading display is blank. The out-of-range signal is an open or short circuit
on the humidification sensor.
MAIN MENU
PROGRAM
HEAT / COOL ⏐
HUMIDIFY ↓
DEHUMIDIFY
HOME SELECT
HUMIDIFY MENU
MODE OFF
HUMIDIFY 44%
MAIN MENU SELECT
HUMIDIFY MODE
OFF
BASIC ⏐
PRECISION ↓
BASIC/DP
HUM MENU SELECT
HUMIDIFY MENU
MODE BAS
HUMIDIFY 45%
MAIN MENU SELECT
HUMIDIFY MENU
MODE BAS
HUMIDIFY 45%
MAIN MENU SELECT
HUMIDIFY
CONTROL
↑
↓
HUM MENU SELECT
%
44
HUMIDIFIER
MAINTENANCE
LENNOX, INC.
1−800−9LENNOX
DELAY RESET
505232 06/07
Page 8
Dew Point Control
NOTE − Dew point control is only available when an outdoor sensor is attached.
Select ADJ from the HUMIDIFY MENU. Dew point adjustment will change
the humidification setpoint based on the outdoor temperature and a user−
defined dew point adjustment setting.
NOTE − In dew point adjustment mode, the humidification setpoint has no
effect whatsoever on unit operation. Only the user−defined dew point adjustment setting affects operation per the following:
Formula:
RH
setpoint
=
Outdoor Temp
2
+ 25 +
RH
user dew point
adjustment
Where: RH
user dew point adjustment
cannot exceed +/−15% and
RH
setpoint
minimum is 15% and cannot exceed 45%.
Turn on and Adjust Dew Point Control
The dew point adjustment control may be adjusted in 1 percent increments;
relative humidity range. To locate the DEW POINT ADJ CONTROL screen:
1. From the home screen press
MENU. From the main menu
screen select HUMIDIFY. Press
SELECT.
2. Use the up or down button to highlight MODE. Press SELECT.
3. To turn on the dew point control in
either basic or precision mode,
use the up or down button to highlight BASIC/DP or PRECISION/
DP. Press SELECT to choose the
mode you want to set.
4. The HUMIDIFY MENU screen reappears, this time with an additional option, DEW POINT ADJ.
5. Use the UP/DOWN button to
highlight DEW POINT ADJ; press
SELECT. Limits: Min. −15%, Max.
+15%. Default setting: 0%.
6. In the DEW POINT ADJ CONTROL screen, use UP/DOWN
buttons to adjust desired dew
point limit. When you reach the
desired level, press SELECT.
Dehumidification
Dehumidification is provided only when the thermostat is in cool mode. The
dehumidification signal (D terminal) is used to reduce the speed of the indoor blower during dehumidification. It does this by de−energizing the D terminal (terminal is an open circuit). Otherwise, the D terminal is activated
with 24VAC. This is always the case when the thermostat is in HEAT or
OFF mode.
The D terminal controls dehumidification. When the thermostat is powered,
the D terminal is always active (24V present) in HEAT and OFF modes and
is also active in the COOL mode EXCEPT when there is a call for dehumidification. When a dehumidification demand is present, the D terminal is de−
energized (open circuit), and the Y1 terminal becomes activated with
24VAC. Y2 (if available) also becomes activated with 24VAC.
The default mode for dehumidification is OFF and needs to be activated
during installation. When dehumidification is occurring, a small teardrop
icon with a −" symbol inside (shown in margin) is displayed on the screen.
MAIN MENU
PROGRAM
HEAT / COOL ⏐
HUMIDIFY ↓
DEHUMIDIFY
HOME SELECT
HUMIDIFY MENU
MODE OFF
HUMIDIFY 44%
MAIN MENU SELECT
HUMIDIFY MODE
BASIC
PRECISION ↑
BASIC/DP ⏐
PRECISION/DP
HUM MENU SELECT
HUMIDIFY MENU
MODE BAS/DP
DEW POINT ADJ 10%
MAIN MENU SELECT
HUMIDIFY MENU
MODE BAS/DP
DEW POINT ADJ 0%
MAIN MENU SELECT
DEW POINT ADJ
CONTROL
↑
↓
HUM MENU SELECT
%
10
−
SignatureStat t Thermostat
Page 9
Dehumidification Modes
In BASIC mode, dehumidification occurs if these conditions are met and
signals are present at specific terminals:
S dehumidification has been enabled, and
S the unit is in COOL mode, and
S cooling demand exists (Y1 energized), and
S dehumidification demand exists.
In PRECISION mode, dehumidification occurs if these conditions are met:
S dehumidification has been enabled, and
S the unit is in COOL mode, and
S dehumidification demand exists , and
S the room temperature is no lower than 2°F below the setpoint.
S (If in Auto Changeover Mode) there has been at least one sensible
cooling call made prior to the dehumidification demand.
NOTE − The H terminal is inactive (open circuit) during dehumidification.
DEHUMIDIFY MODE Screen
NOTE − Basic or Precision mode must be turned on before you can adjust
the dehumidification level on the thermostat.
DEHUMIDIFY CONTROL may be adjusted in 1 percent increments; relative humidity range. To locate and adjust the DEHUMIDIFY CONTROL:
1. From the home screen press
MENU. Use the UP or DOWN
button to highlight DEHUMIDIFY.
Press SELECT for the DEHUMIDIFY MENU.
2. From the DEHUMIDIFY MENU,
press SELECT again to choose
MODE.
3. The default setting for dehumidifi-
cation is OFF. To turn on basic dehumidification mode, select BASIC. To turn on precision
dehumidification mode, select
PRECISION.
4. If you selected BASIC in the pre-
vious step, BAS is displayed on
the right−hand side of the screen.
5. Use the UP/DOWN button to
highlight DEHUMIDIFY; press
SELECT. Setting limits: Min. 45%,
Max. 60%. Default setting: 50%.
6. In the DEHUMIDIFY CONTROL
screen, use the UP/DOWN buttons to adjust for the desired humidification level; press SELECT.
MAIN MENU
PROGRAM
HEAT / COOL
HUMIDIFY
DEHUMIDIFY
HOME SELECT
DEHUMIDIFY MENU
MODE OFF
DEHUMIDIFY 50%
MAIN MENU SELECT
DEHUMIDIFY MODE
OFF
BASIC
PRECISION
HUM MENU SELECT
DEHUMIDIFY MENU
MODE BAS
DEHUMIDIFY 50%
MAIN MENU SELECT
DEHUMIDIFY MENU
MODE BAS
DEHUMIDIFY 50%
MAIN MENU SELECT
DEHUMIDIFY CONTROL
↑
↓
DEHUM MENU SELECT
%
50
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