Lennox SignatureStat 81M26, SignatureSu0001tat 81M27, SignatureSu0001tat 81M28 Programming And Application Manual

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E2007 Lennox Industries Inc.

Dallas, Texas, USA

Table of Contents

SignatureStatt 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

SignatureStatt 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 − SignatureStatt thermostat 1 − Outdoor temperature sensor

Litho U.S.A.

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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.

SignatureStat t Thermostat

The fully programmable SignatureStatt 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.)

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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 SignatureStatt 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

SignatureStat t

THERMOSTAT)

Features

Outdoor Temperature Sensor

The outdoor sensor is provided as a standard component of each SignatureStatt 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

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.

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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 WeekThe 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 WeekNext 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

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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

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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

HUMIDIFIER

MAINTENANCE

LENNOX, INC.

1−800−9LENNOX

DELAY RESET

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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:

setpoint

Outdoor Temp

+ 25 +

user dew point adjustment

Where: RH

user dew point adjustment

cannot exceed +/−15% and

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

−

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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

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Humiditrol

Accessory

If a Humiditrol

accessory is present in the equipment at hand, then the

SignatureStatt thermostat must be configured to properly operate the Hu- miditrol® accessory as follows (see Figure 6 for the Humiditrol operation flowchart):

1. From the Home screen, press MENU. Then select INSTALLER SETTINGS. Select HUMIDITROL, then select ENABLE. Verify that the HUMIDITROL ON is displayed in the INSTALLER SETTINGS menu.

2. Select MAIN MENU. Then select DEHUMIDIFY. Select MODE, then select HUMIDITROL. The SignatureStatt thermostat is now configured to operate the Humiditrol® accessory.

NOTE − Humiditrol® operation requires use of an outdoor sensor. If sensor is not connected and Humiditrol® is enabled, OUTSIDE ERR" is displayed on the main screen.

SignatureStatt thermostat operation with Humiditrol

enabled

Cooling onlyDehumidification will only occur if a dehumidification de-

mand is present, a cooling demand is not present, outdoor temperature is less than 95ºF, and the indoor temperature is not cooler than:

Heating setpoint + 2ºF (IF the difference between cooling and heating setpoints is greater than the deadband)

Cooling setpoint – deadband + 2ºF (IF the difference between cooling and heating setpoints is less than the deadband)

In this case, the 24 VAC is removed from the D" terminal and the Y2" terminal (if available) becomes activated with 24VAC. This will cycle the indoor variable speed motor to the dehumidification speed and cycle Y2 On" to the outdoor unit Cooling calls have priority over Humiditrol® calls.

Heating onlyThermostat will cycle heating On" and Off  to maintain heating setpoint. Dehumidification functions are disabled.

Calculating maximum allowable overcooling in cooling-only mode START

Maximum allowable overcooling is equal to the cooling setpoint minus the deadband plus 2ºF

Is the

cooling setpoint

minus heating setpoint greater than the

deadband

YES

Maximum allowable overcooling is equal to the heating setpoint plus 2ºF

Values below were calculated following this flow diagram

"2" in calculations below is for overcool," up to 2°F above heating setpoint.

Heating Only Setpoint

Cooling Only Setpoint

Deadband Setting (Range 3 to 8°F)

Maximum Allowable Overcooling:

75 °F 75 °F 4 °F 75 – 4 + 2 = 73°F (difference is

less than deadband setting)

80 °F 77 °F 5 °F 77 – 5 + 2 = 74°F (difference is

less than deadband setting)

74 °F 79 °F 6 °F 79 – 6 + 2 = 75°F (difference is

less than deadband setting)

70 °F 79 °F 6 °F 70 + 2 = 72°F (79 –70 = 9 > 6

therefore use heating setpoint)

AutochangeoverDehumidification will only occur if a dehumidification

demand is present, a cooling demand is not present, outdoor temperature is less than 95°F, and the indoor temperature is not cooler than 2ºF above heating setpoint.

In this case, the 24 VAC is removed from the D" terminal and the Y2" terminal (if available) becomes activated with 24VAC. This will cycle the indoor variable speed motor to the dehumidification speed and cycle Y2 On" to the outdoor unit. Cooling calls have priority over Humiditrol® calls. Humiditrol® mode is allowed to overcool up to 2°F above the heating setpoint.

Note: If the last thermostat demand was a heating demand, the thermostat does not require a cooling demand before Humiditrol® operation.

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Other Humiditrol® Accessory Notes:

If the outdoor sensor is disconnected while Humiditrol® is enabled, thermostat will not allow operation in dehumidification mode.

Set point range: 45 to 60% Relative Humidity (RH). Factory default − 50%.

Relative Humidity controls to within 2% on either side of RH set point.

When the D" terminal is activated with 24VAC,.dehumidification is inactive.

Basic, Precision and Humiditrol

modes are deactivated by default from

the factory.

When HOLD" modes (Temporary, Vacation) are activated, and Autochangeover is enabled, there is insignificant opportunity for dehumidification because cooling and heating use the same temperature setpoint.

As a precaution, regardless of how low the heating setpoint has been set, Humiditrol® dehumidification is inhibited below 65ºF indoor temperature.

Changing Time of Day / Day of Week

The time of day must be entered via the menu. This information appears on the top line of the home screen.

1. From the home screen press MENU. Use the UP or DOWN button to highlight DAY/TIME. Press SELECT.

2. Use the UP or DOWN button to highlight DAY, HOUR, or MINUTES. Press SET.

3. Use the UP or DOWN button to scroll through the days of the week, hours, or minutes. Press SET to select desired value. Press FINISHED when complete (see diagram).

Cycling the Fan

Fan Settings

1. From the home screen press MENU. Use the UP or DOWN buttons until FAN is highlighted. Press SELECT.

2. Use the UP or DOWN buttons to highlight FAN SETTINGS. Press SELECT.

3. Three fan setting choices are available:

ON will turn the indoor blower on continuously.

AUTO will turn the indoor blower on only when there is a call for heating or cooling.

INTERMITTENT will turn the indoor blower on for a set period of time for a given interval. Highlight the choice you desire and press SELECT.

Intermittent fan default ON time is 5 minutes; Default OFF time is 20 minutes. This function allows users to cycle the indoor blower for a selectable number of minutes per hour during periods of inactivity of heating/cooling system. ON time can be set from 1 to 20 minutes in 1−minute steps; OFF time can be set from 10 to 40 minutes in 1−minute steps.

If the HVAC system runs for a longer period than the ON cycle, the OFF cycle will start counting over again when the system shuts off (see diagram).

MAIN MENU

DAY / TIME FAN ↑ USER SETTINGS ⏐ INSTALLER SETTINGS

HOME SELECT

MAIN MENU DAY FRIDAY HOUR 12 PM MINUTES 06

HOME SET

MAIN MENU DAY FRIDAY HOUR 12 PM MINUTES 06

FINISHED SET

MAIN MENU

DAY / TIME FAN ↑ USER SETTINGS ⏐ INSTALLER SETTINGS

HOME SELECT

FAN MENU FAN SETTINGS FAN PROGRAM

HOME SELECT

FAN SETTINGS ON AUTO INTERMITTENT

MAIN MENU SELECT

INTERMITTENT FAN

ON TIME 5 MIN ↑ OFF TIME 20 MIN ↓

FAN MENU SELECT

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Fan Program

This function allows the user to select whether the indoor blower operates in ON or AUTO modes during each programmed event period. For example, the indoor blower could be programmed to run in AUTO mode during the WAKE and MORN event periods and run in ON mode during the EVE and NIGHT event periods. The indoor blower may be set to run continuously during the occupied times to improve indoor air quality.

1. From the home screen press MENU. Use the UP or DOWN buttons until FAN is highlighted. Press SELECT.

2. Use the UP or DOWN buttons to highlight FAN PROGRAM. Press SELECT.

3. Use the UP or DOWN buttons to highlight the days or day you want to program. You can choose MON to SUN, MON to FRI, SAT to SUN, or individual days of the week. Press SELECT.

4. Use the UP or DOWN buttons to highlight the event you want to program.

5. Press SELECT. ON/AUTO is highlighted. Use the UP or DOWN buttons to highlight the ON or AUTO. Press SELECT. Press SET to select desired value. Press FINISHED when complete.

MAIN MENU

DAY / TIME FAN ↑ USER SETTINGS ⏐ INSTALLER SETTINGS

HOME SELECT

FAN MENU FAN SETTINGS FAN PROGRAM

HOME SELECT

SELECT PROGRAM DAYS

MON TO SUN MON TO FRI ⏐ SAT TO SUN ↓ MONDAY

MAIN MENU SELECT

MON−SUN PROGRAM

FAN WAKE 6:30 AM AUTO MORN 8:30 AM AUTO EVE 4:30 PM AUTO NIGHT 10:30 PM AUTO

MAIN MENU SELECT

MON−SUN PROGRAM

FAN WAKE 6:30 AM AUTO MORN 8:30 AM AUTO EVE 4:30 PM AUTO NIGHT 10:30 PM AUTO

MAIN MENU SELECT

MON−SUN PROGRAM

FAN WAKE 6:30 AM AUTO MORN 8:30 AM AUTO EVE 4:30 PM AUTO NIGHT 10:30 PM AUTO

MAIN MENU SELECT

MON−SUN PROGRAM

FAN WAKE 6:30 AM ON MORN 8:30 AM AUTO EVE 4:30 PM AUTO NIGHT 10:30 PM AUTO

MAIN MENU SELECT

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User Settings and Options

User settings allow you to personalize your thermostat and change the way information is displayed on the home screen, and it helps to optimize the HVAC system to your comfort level.

1. From the home screen press MENU. Use the UP or DOWN buttons until USER SETTINGS is highlighted. Press SELECT.

2. Choose the setting you would like to change by pressing the UP or DOWN button to highlight the desired selection; then press SELECT. The first four settings may be set as follows:

ºF or ºC settingYou can choose to display the temperature in either Fahrenheit (F) or Celsius (C).

Press the UP or DOWN button to select the temperature display that you want, then press SELECT.

12 or 24 hour settingYou can choose to display the time in 12−hour format (default) or 24−hour format (international option).

Press the UP or DOWN button to select the time display that you want, then press SELECT.

SHOW SET TEMP settingEach event has a setpoint temperature, and the default is to display the setpoint on the HOME screen. Choose whether to display this value or not.

Press the UP or DOWN button to select whether you want the setpoint temperature displayed or not, then press SELECT.

EVENTS/DAY settingThis screen allows users to select the number of events per day. The default number of events per day is 4 (WAKE, MORN, EVE, and NIGHT); the alternate setting is two events (WAKE and NIGHT).

Press the UP or DOWN button to select the number of events you want for the day, then press SELECT.

3. Differential and delay settings determine when a first− or secondstage demand exists and desired delay time before the second stage operation can begin.

4. Choose one of the differential or relay settings from the User Settings menu. The screen changes to the differential settings menu. 1ST STAGE DIFFerential is used in all thermostats.

MAIN MENU

DAY / TIME FAN ↑ USER SETTINGS ⏐ INSTALLER SETTINGS

HOME SELECT

USER SETTINGS Y F OR C F° 12 OR 24 HR 12 SHOW SET TEMP 78°F EVENTS/DAY 4

MAIN MENU SELECT

TEMPERATURE

ºF

ºC

USER MENU SELECT

CLOCK

12 HOUR 24 HOUR

USER MENU SELECT

DISPLAY SETPOINT

TEMPERATURE

YES

USER MENU SELECT

BB B B B

0 6 12 18 24

SELECT

EVENTS/DAY 4

USER MENU SELECT

USER SETTINGS Y 1ST STAGE DIFF 1.0°F 2ND STAGE DIFF 2.0°F 2ND STAGE DELAY 20

COOLING LIMIT 45°F

MAIN MENU SELECT

DIFFERENTIAL SETTINGS

1ST STAGE DIFF 1°F 2ND STAGE DIFF 2°F 2ND STAGE DELAY 20

MAIN MENU SELECT

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The default is 1.0°F but can be programmed between 0.5° and 3.0°F in 0.5°F increments. See figure 4 for first−stage heating and cooling operations.

Figure 4. First−Stage Differential Settings

0°C

100°C

1st-stage ON

Setpoint + 0.5°F

No action

Setpoint

1st-stage OFFNo action

0°C 100°C

1st-stage ON

No action

Setpoint

1st-stage OFF

No action

Setpoint + 1st-stage diff

− 0.5°F

Setpoint

− 0.5°F

Setpoint

− 1st-stage diff + 0.5°F

HEATING MODE

COOLING MODE

2ND STAGE DIFFerential (multistage models only). The low limit

(and default) is 2.0°F but can be programmed up to 8.0°F in 0.5°F increments. See figure 5 for second−stage operation heating and cooling modes.

NOTE − On the 81M28 thermostat, the second−stage operation can be LOCKED OUT using the balance point settings. This second− stage lockout will OVERRIDE the operation shown in figure 5.

Figure 5. Second−Stage Differential Settings

0°C

100°C

Setpoint

− 1st stage diff

− 2nd stage diff + 0.5°F

2nd-stage ON

Setpoint + 0.5°F

1st-stage OFFIf 2nd-stage

timer expires,

then turn on

2nd-stage

Setpoint

2nd-stage OFF

Setpoint

−1st-stage diff + 0.5°F

1st-stage ON & reset 2nd-stage timer

Setpoint

− 0.5°F

No action No action

0°C

100°C

Setpoint + 1st-stage diff + 2nd-stage diff

− 0.5°F

2nd-stage ON

Setpoint

− 0.5°F

1st-stage OFF If 2nd-stage

timer expires,

then turn on

2nd-stage

Setpoint

2nd-stage OFF

Setpoint + 1st-stage diff

− 0.5°F

1st-stage ON & reset 2nd-stage timer

Setpoint + 0.5°F

No action No action

No actionNo action

COOLING MODE

HEATING MODE

2ND STAGE DELAY timer (multistage models only). Default delay is

20 minutes but can be programmed from 5 to 40 minutes in 5−minute increments. If first stage fails to advance the ambient temperature toward the setpoint by 1.0°F in the programmed delay time, then the second stage is activated (see figure 5).

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5. Heating and cooling limits help prevent user−settings to extreme temperatures. The homeowner can limit the maximum setting for the heating and cooling modes, thus helping to conserve energy and costs. Press the UP or DOWN button to select the highest or lowest temperature for heating or cooling, then press SELECT. Programmed setpoints will be changed if they are higher (heating) or lower (cooling) than the minimum allowed setpoint. A warning screen appears before programmed setpoints change. COOLING LIMITThe default is 45°F. The minimum cooling setpoint can be programmed from 45° to 90°F in 1.0°F increments. HEATING LIMITThe default is 90°F. The maximum heating setpoint can be programmed from 45° to 90°F in 1.0°F increments.

6. Security settings are available to prevent tampering with the program and the user’s desired settings. Two levels of security are available; the default security setting is OFF.

ALLOW TEMPERATUREthis level permits temporary changes to temperature only while disallowing change to other programming.

RESTRICT ALLthis disallows any changes to System, Fan, Pro- gram, or setpoint. If security is activated, a screen pops up into which a 4−digit user security code is to be entered before any change is permitted.

Entering Security CodeSecurity is enabled after you enter a user−selectable 4−digit, numeric security code at the SECURITY SETTINGS screen.

Security remains enabled until the same security code is entered some time later, when changes to other settings are attempted. After the security code is entered, complete access to all features and functions is provided. To enable security again, re−enter a security code via the SECURITY SETTINGS screen.

A From the home screen press MENU. B Use the UP or DOWN button to highlight USER SETTINGS.

Press SELECT.

C Use the UP or DOWN button to highlight SECURITY. Press SE-

LECT.

D Use the UP or DOWN button to highlight select ALLOW TEM-

PERATURE or RESTRICT ALL. Press SELECT.

NOTE − Choosing ALLOW TEMPERATURE places the security code on all programming except the temperature. Other users can still change the temperature up or down. Such changes remain effective until the time of the next programmed event. RESTRICT ALL prevents any change without first entering the security code.

E Use the UP/DOWN buttons to select the first digit for the code,

then press SELECT.

F After you choose the first value, the second digit is highlighted.

Repeat for all four digits.

G When the correct code is in, press a final SELECT. Future pro-

gramming changes will now require the code to be entered before changes can be made.

USER SETTINGS Y

2ND STAGE DELAY 20 COOLING LIMIT 45°F

HEATING LIMIT 90°F

SECURITY OFF

MAIN MENU SELECT

WARNING: CHANGING MIN/MAX VALUE WILL CHANGE PROGRAMMED TEMPERATURE SETTINGS. CONTINUE:

NO YES

SET COOLING LIMIT

LOWEST COOLING

SETTING ALLOWED

45°F

USER MENU SELECT

SET HEATING LIMIT

HIGHEST HEATING

SETTING ALLOWED

90°F

USER MENU SELECT

USER SETTINGS Y 2ND STAGE DELAY 20 COOLING LIMIT 45°F HEATING LIMIT 90°F SECURITY OFF

MAIN MENU SELECT

SECURITY

ALLOW TEMPERATURE RESTRICT ALL

USER MENU SELECT

ENTER SECURITY CODE

FOR USER SETTINGS

0 0 0 0

USER MENU SELECT

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IMPORTANT

Stress to the homeowner the importance of remembering the Security Code  if code is forgotten or misplaced, the universal code 4199" can be used. If the thermostat is reset, all schedules are erased and full reprogramming is required.

After the security code is set, when any button on the thermostat is pushed, a screen appears that requires the security code to be entered. After the correct security code is entered, security is turned off. After revisions are made to the settings, the user must reenter the code to reestablish security

Change Temperature Settings

NOTE − If auto changeover is enabled at the time a temperature hold is invoked, the thermostat MAY CHANGE OVER from heating to cooling and vice versa, to maintain the temperature hold setpoint. The auto changeover deadband is still used to determine whether changeover occurs. This applies to all of the following hold modes.

Brief Temperature Change

1. From the home screen, press the UP or DOWN button. Press the UP/DOWN buttons to adjust to the desired temperature.

2. This setting will hold for 3 hours or until the next programmmed event begins, whichever time period is shorter.

3. After pressing SET TEMP or after 5 seconds, the home screen indicates new setpoint and duration. RESUME PROGRAM cancels a temporary setpoint change and returns to programmed setting.

Hold Settings Menu

Make permanent, temporary, or vacation changes through the HOLD SETTINGS menu. To access the menu, press HOLD TEMP from home screen.

Change Temperature Permanently

In the permanent change mode, the setpoint is maintained indefinitely. The thermostat must not be in OFF mode to enter this mode. To resume programmed operation press the RESUME PROGRAM button from the main screen.

1. From the home screen, press the HOLD TEMP button Then select PERMANENT HOLD.

2. Use the UP or DOWN button to set the temperature to the desired level. Press SET TEMP.

3. The home screen will now indicate a PERMANENT HOLD. RESUME PROGRAM will cancel a permanent hold and return to the programmed temperature setting.

Change Temperature Temporarily

The setpoint and temperature are held for up to 24 hours.

1. From the home screen, press the HOLD TEMP button Then select TEMPORARY HOLD.

SET AT

↑ ↓

UNTIL 4:00 PM

HOME SET TEMP

°F

SET AT

↑ ↓

UNTIL 5:00 PM

HOME SET TEMP

°F

SET AT 78 UNTIL 5:00 PM

AUTO

FAN INT

27%RH OUTSIDE 95

RESUME

PROGRAM MENU

ºF

HOLD SETTINGS PERMANENT HOLD TEMPORARY HOLD VACATION HOLD

HOME SELECT

PERMANENTLY AT

↑ ↓

HOLD MENU SET TEMP

°F

PERMANENTLY SET AT 75

AUTO

FAN INT

27%RH OUTSIDE 95

RESUME

PROGRAM MENU

ºF

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2. The temperature should be highlighted. Press the UP or DOWN button to adjust the temperature. Press SET TEMP.

3. The time should be highlighted. Press the UP or DOWN button to adjust the time. Press SET TIME.

4. The home screen will now indicate a TEMPORARY HOLD until the desired time. RESUME PROGRAM will cancel the temporary hold and return to the programmed temperature setting.

Setting Vacation Mode

The setpoint and temperature are held to up to 45 days.

1. From the home screen, press the HOLD TEMP button Then select VACATION HOLD.

2. The temperature should be highlighted. Use the UP or DOWN button to change to the desired temperature. Press SET TEMP.

3. The number of days should be blinking. Use the UP or DOWN button to set the length of your vacation. Press SET DAY.

4. The home screen will now indicate the VACATION settings. RESUME PROGRAM will cancel the vacation settings and return to the programmed temperature setting.

Installer Settings

The INSTALLER SETTINGS are programmed during the initial installation and are selected based on the type of equipment used in the application. This feature should be set only by a certified HVAC technician. Incorrect use of these settings could result in higher energy costs and may even damage the HVAC equipment.

1. From the home screen press MENU. Use UP/DOWN buttons to highlight INSTALLER SETTINGS. Press SELECT.

2. The INSTALLER SETTINGS screen appears. Use the UP/ DOWN buttons to scroll to all the installer settings.

NOTE − DEADBAND setting will not appear if AUTO CHANGEOVER is disabled. BALANCE POINT settings appears only on 81M28 units only and require that an outdoor temperature sensor be installed.

3. Select SYSTEM SETUP. The resulting screen depends on which system and thermostat are being installed and are described as follows:

SYSTEM SETUPUse the 81M26 thermostat’s system setup screen to choose the system component that the thermostat will control. Use UP/DOWN buttons for desired selection; press SELECT.

TEMPORARILY AT

↑ ↓

UNTIL 4:00 PM

HOME SET TEMP

°F

TEMPORARILY SET AT

↑ ↓

UNTIL 10:00 PM

HOME SET TEMP

°F

SET AT 72 UNTIL 10:00 PM

AUTO

FAN INT

27%RH OUTSIDE 95

RESUME

PROGRAM MENU

ºF

VACATION SETTING

↑ ↓

FOR 2 DAYS

HOME SET DAY

°F

VACATION SETTING

↑ ↓

FOR 45 DAYS

HOME SET DAY

°F

SET AT 78 FOR 45 DAYS

AUTO

FAN INT

27%RH OUTSIDE 95

RESUME

PROGRAM MENU

ºF

MAIN MENU

DAY / TIME FAN ↑ USER SETTINGS ⏐ INSTALLER SETTINGS

HOME SELECT

INSTALLER SETTINGS Y SYSTEM SETUP GAS RESIDUAL COOL 120 LOW BALANCE 28°F HIGH BALANCE 28°F

AUTO CHANGEOVER ON EER ON DEADBAND 4.0°F HUMIDITROL OFF

SECURITY OFF CONTACT INFO SERVICE INT REMINDER CLNDR

TEMP OFFSET 0.0°F

MAIN MENU SELECT

SYSTEM SETUP

FURNACE HEAT PUMP

INSTALL MENU SELECT

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NOTE − In addition to non−heat pump single-stage applications, the 81M26 thermostat supports a single-stage heat pump with NO auxiliary heat source.

1ST STAGE HEATINGUse the 81M27 thermostat’s 1st stage heating screen to choose gas/oil or electric first−stage heating.

Use UP/DOWN buttons for desired selection; press SELECT.

AUXILIARY HEATUse the 81M28 thermostat’s auxiliary heat screen. Use UP/DOWN buttons for desired selection; press SELECT.

If using an electric furnace, select STANDARD − COMP = ON; if using a gas furnace (dual fuel), use ADD ON − COMP = OFF).

4. BALANCE POINTSBalance point settings are only available on the 81M28 thermostat. This screen appears only when optional out- door sensor 46M98 is connected to the thermostat.

When sensor is used with the 81M28, you can set the lower and upper temperatures to disable or enable second stage heat.

Use the UP/DOWN buttons to select either LOW or HIGH BALANCE. Press SELECT. Now use the UP/DOWN buttons to adjust the balance point temperature. Setting range: −20F to +75F.

NOTE − High Balance cannot be set lower than the LOW setting; Low Balance cannot be set higher than the HIGH setting.

5. RESIDUAL COOLTo ensure greatest cooling efficiency, the indoor blower can be programmed to run after a cooling demand has been

met by adjusting the residual cool setting. This is the amount of time that the indoor blower will run after a call for cooling has been satisfied. This ensures that any residual cool air will be pushed out of the ductwork and into the living area. Residual cool may interfere with proper system operation, especially in humid climates.

Set residual cool to run for 30, 60, 90, or 120 seconds after the compressor has shut off (default: OFF).

6. AUTO CHANGEOVER / AUTOCHANGE DEADBANDWhen

AUTO CHANGEOVER (default − DISABLED) is turned ON, the thermostat will switch automatically between heating and cooling to maintain the optimal temperature in the home.

From the INSTALLER SETTINGS menu, select AUTO CHANGEOVER, then select ENABLE.

The minimum allowable difference between the heating and cooling setpoints is the auto changeover deadband (default − 4.0 degrees). DEADBAND appears only when auto changeover is ENABLED as described above. The deadband may be adjusted from 3.0 to 8.0 degrees in 0.5 degree increments.

From the INSTALLER SETTINGS menu select DEADBAND. Use the UP and DOWN arrows to adjust.

With default settings as described, the thermostat is essentially shipped as a HEAT/COOL thermostat).

HEATING/1ST STAGE HEATING

GAS / OIL

ELECTRIC

INSTALL MENU SELECT

AUXILIARY HEAT

STANDARD − COMP = ON ADD ON − COMP. = OFF

BACK SELECT

BALANCE POINTS

LOW BALANCE 45 °F HIGH BALANCE 75 °F

INSTALL MENU SELECT

RESIDUAL COOL

SECONDS DELAY

OFF

INSTALL MENU SELECT

AUTO CHANGEOVER

DISABLE

ENABLE

INSTALL MENU SELECT

AUTOCHANGE DEADBAND

4ºF

INSTALL MENU SELECT

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7. ENERGY EFFICIENT RECOVERYWith energy efficient recovery

enabled, the recovery will start before the programmed time. When disabled, the control will start a recovery at the programmed time. The control assumes a heating capacity of 6°F per hour and a cooling capacity of 4°F per hour. The control then turns on before the programmed time by determining the difference between the actual temperature and the recovered setpoint.

The control then calculates how much in advance the low−cost first stage will operate to be at the setpoint at the programmed time. The second stage is locked" out until 20 minutes before the programmed time.

The energy efficient recovery default setting is on (ENABLE). To turn it off, use UP/DOWN buttons to highlight DISABLE; press SELECT.

NOTE − When the EER causes the equipment to be activated ahead of the programmed event time, EER will be displayed on the home screen in the place of the outdoor temperature.

8. HUMIDITROL If a Humiditrol

accessory is present in the equip-

ment at hand, then the SignatureStatt thermostat must be config- ured to properly operate the accessory. An outdoor sensor is re- quired when using Humiditrol. Configure the thermostat as follows (see Figure 6 for the Humiditrol operation flowchart):

From the Home screen, press MENU. Select INSTALLER SETTINGS, then HUMIDITROL, then ENABLE. Verify that the HUMIDITROL ON is displayed in the INSTALLER SETTINGS menu.

From Home screen, press MENU, then DEHUMIDIFY, then MODE, then HUMIDITROL. The thermostat is now configured to operate the accessory.

9. SECURITY CODEA security code prevents changes to the IN-

STALLER settings. The default security code setting is OFF. This level of security restricts access to the installer menus. All other thermostat and user settings are available. When SECURITY is selected, a screen appears for entering a four−digit installer security code.

If the installer settings security code is forgotten or misplaced for some reason, the universal code "0801" can be used.

10. CONTACT INFORMATIONThis will provide information to the

homeowner regarding who and when to contact in case of trouble, or for routine service. Contact information is displayed in the event of a service maintenance interval (such as an elapsed system monitor timer). You can program two full lines of character information via the user interface. The top line can contain up to 20 characters, and the bottom line can contain up to 14 characters.

At the contact screen, push the EDIT button then the UP/DOWN buttons to choose correct contact information. Push NEXT to advance to next character. When finished with the first line, press ACCEPT. The cursor advances to the next line.

Continue choosing contact information, then push ACCEPT to finish.

ENERGY EFFICIENT

RECOVERY

DISABLE

ENABLE

INSTALL MENU SELECT

INSTALLER SETTINGS Y AUTO CHANGEOVER ON EER ON DEADBAND 4.0°F HUMIDITROL OFF

MAIN MENU SELECT

HUMIDITROL

DISABLE

ENABLE

INSTALL MENU SELECT

ENTER SECURITY CODE

FOR INSTALLER

SETTINGS

0 0 0 0

INSTALL MENU SELECT

CONTACT INFORMATION

BACK EDIT

CONTACT INFORMATION

MY HVAC COMPANY

1−800−123−456

ACCEPT NEXT

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11. SERVICE INTThese settings

establish criteria for service messages and alert the homeowner when filters or cooling/heating system need servicing. This monitor counts the run time hours or calendar days of operation of the indoor blower. When the programmed time is reached, a message will appear on the HOME screen (message programmable via the CONTACT INFORMATION screen).

The service interval setting can be adjusted for intervals from 20 to 980 hours (in 20-hour increments), and to reset the timer and warning message. The OFF setting disables the CHANGE FILTER warning.

Two choices are available on this menu: the Service Monitor and the Filter Monitor. Both can be set based on the HVAC system run time or the calendar. (See Reminder Interval.)

Choose a MONITOR: COOL, HEAT (SYSTEM on 81M28), or FILTER. Press SELECT. The Checkup Interval screen appears.

Use the UP or DOWN button to adjust the number of hours or days for the service interval. Press SELECT when you reach the desired number.

12. REMINDERThe reminder period can be set for either HVAC sys-

tem run-time (hours) or based on the calendar (days).

If RUN TIME is chosen, the service reminder will be set in hours and displayed on the INSTALLER SETTINGS menu as RUN.

After indoor blower has operated for selected number of hours, a Service Reminder alerts homeowner that it is time to service system or filter.

If CALENDAR TIME is chosen, the service reminders will be set in days and displayed on the INSTALLER SETTINGS menu as CLNDR. After the selected number of days has passed, a Service Reminder will be displayed to alert the homeowner that it is time to service the system or filter.

13. TEMP OFFSETThis feature adds or subtracts the amount of the

setting to/from the detected room temperature.

For example, if actual room temperature is 75ºF and the offset were set at −1.0ºF, the thermostat’s display would show 74ºF.

The temperature offset is programmable from −3 to +3°F, and the default offset is zero.

Remote Outdoor Sensor

The remote outdoor sensor (46M98) can be used to aid in the comfort of the home or simply as a sensing device for outdoor conditions.

In most applications, the SignatureStatt thermostat will have a display of the temperature sensed by the remote outdoor sensor. With the heat pump system, the remote outdoor sensor can help determine when to turn on the second stage of heating for optimal comfort.

When the outdoor sensor is connected, the temperature displays on the right−hand side of the screen. For example, the display will show OUTSIDE 77°F" if the outdoor temperature is 77°F.

SERVICE MONITOR MENU

COOL MONITOR 980 HEAT MONITOR 980 FILTER MONITOR 980

INSTALL MENU SELECT

COOLING SYSTEM CHECK−UP

HEATING SYSTEM CHECK−UP

FILTER REPLACEMENT

INTERVAL 600 HRS

SERVICE MENU SELECT

SERVICE MONITOR MENU

SERVICE MONITOR 180 FILTER MONITOR 120

INSTALL MENU SELECT

SYSTEM CHECK−UP

INTERVAL

90 DAYS

SERVICE MENU SELECT

REMINDER PERIOD

RUN TIME CALENDAR TIME

INSTALL MENU SELECT

TEMPERATURE OFFSET

↑

−1.0 ºF ↓

INSTALL MENU SELECT

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Installing Remote Outdoor Sensor

Install the remote outdoor sensor on a northern wall of the home, away from direct sunlight or other heat sources that may affect its sensitivity.

IMPORTANT

The outdoor sensor must be connected with twisted pair wire (84X49 [1000’ roll] or X3790 [500’ roll]). For operating a system with a Humiditrol® accessory, the remote sensor MUST be installed.

Display Lights

The display lights indicate HVAC system operation.

S HEAT or COOL light will be illuminated with a call for heating or cooling

(81M26 and 81M27 models).

S AUX light indicates the second stage of heating − W2 is active (81M28

model only).

S EMER light indicates that the emergency heat is enabled in HEAT/

COOL menu, regardless of heat demand (81M28 model only). Emergency heat is activated via the E/W1 terminal.

S CHECK light comes on when a 24V signal is present on the L" termi-

nal. This indicates that the equipment requires service by a qualified technician (all models).

Memory Protection

The thermostat stores all the information concerning its programming (state, mode, program information, last temperature measured) in a nonvolatile memory.

This function avoids the loss of the state of the thermostat when a power− down occurs. The only thing that might be lost is the time. A super−cap provides 2 hours of power reserve (for power outages). When a power down occurs (due to a power outage) the thermostat is able to switch off all relays. The O and B relay will maintain their last state.

EPA ENERGYSTAR® Recommended Setpoints

EPA ENERGYSTAR® recommended setpoints for heating and cooling can help the household save energy.

The following time and temperatures are preprogrammed into the control to conform to Energy Star requirements.

Table 1. ENERGYSTAR

Setpoints

Time Winter Heating Summer Cooling

Morning 70°F (21°C) 78°F (25°C)

Day 62°F (17°C) 85°F (29°C)

Evening 70°F (21C) 78°F (25°C)

Night 62°F (17°C) 82°F (28°C)

NOTE − Humidification and dehumidification are not part of the ENERGYSTAR® program. A higher utility bill may occur when not using the setpoints in table 1.

Resetting Program to Factory Conditions

To reset the SignatureStatt thermostat to factory conditions, press the UP button and the LEFT button at the same time. Hold for 8 seconds. The time of day will display 12:00 indicating a reset has occurred or until LENNOX  or the software version is shown on LCD.

NOTE − This will erase all programming and return the thermostat to the factory conditions, including the installer settings. Use this only as a last resort.

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Thermostat−Specific Information

81M261 Stage Heat / 1 Stage Cool, Heat Pump without Auxiliary Heat, or Non−Heat Pump

Table 2. 81M26 LED Indicators

COOL Cooling mode (Y is active)

CHECK 24V signal is present on the L" terminal

HEAT Heating mode (W is active)

Fan AutoWhen COOLING, the indoor blower will cycle with calls for

cooling. When HEATING, and with the thermostat set for gas/oil, the indoor blower (G) does not cycle with a call for Heat. The independent fan control in the flue will cycle the indoor blower as necessary.

GO TO: MENU > INSTALLER SETTINGS > SYSTEM SETUP > FURNACE > GAS/OIL

When in electric heat, the indoor blower (G) cycles with the call for heat.

GO TO: MENU > INSTALLER SETTINGS > SYSTEM SETUP > FURNACE > ELECTRIC

When the single stage heat pump is activated, the indoor blower cycles with every call of heating and cooling.

GO TO: MENU > INSTALLER SETTINGS > SYSTEM SETUP > HEAT PUMP

Fan ONThe indoor blower is ON continuously regardless of whether

the heating or cooling equipment is running.

Table 3. 81M26 Terminal Designations

R 24 Vac power input

C 24 Vac common

Y1 Energized on call for COOL

E/W1 Energized on call for HEAT

G Energized on call for FAN

H Energized on a call for humidification

D De−energized on a call for dehumidification (reverse logic)

O COOL active (always energized when the stat is in COOL mode,

default value is OFF)

B HEAT active (always energized when the stat is in HEAT mode,

default value is ON)

L Illuminates CHECK LED when energized with 24VAC

NOTE − High−temperature PEPI disables W1 when ambient temperature exceeds 95°F.

Thermostat Off" ModeIn this mode, the heating and cooling and

H/D terminals are inactive. The O or B terminal is active. This is determined by the last state of O/B. For example, if the mode goes from heat (B active) to off, then B will be active in the off mode. Default on power−up is B active. The G terminal may be active if FAN ON is selected from the menu.

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81M272 Stage Heat & Cool, Non−Heat Pump

Table 4. 81M27 LED Indicators

COOL Cooling mode (Y is active)

CHECK 24V signal is present on the L" terminal

HEAT Heating mode (W1 is active)

Table 5. 81M27 Terminal Designations

R 24 Vac power input from HVAC system

C 24 Vac common

Y1 Energized on call for 1st stage COOL

Y2 Energized on call for 2nd stage COOL

E/W1 Energized on for 1st stage HEAT

W2 Energized on for 2nd stage HEAT

G Energized on call for FAN

H Energized on a call for humidification

D De−energized on a call for dehumidification (reverse logic)

O COOL active (always energized when the stat is in COOL mode,

default value is OFF)

B HEAT active (always energized when the stat is in HEAT mode,

default value is ON)

L Illuminates CHECK LED when energized with 24VAC

NOTE − High−temperature PEPI disables W1 ands W2 when ambient temperature exceeds 95F.

Fan AutoIn COOLING, the indoor blower cycles with calls for cooling.

In HEAT, and with the thermostat set for gas/oil, the indoor blower (G) does not cycle with a call for heat. The independent fan control in the flue will cycle the indoor blower as necessary.

GO TO: MENU > INSTALLER SETTINGS > SYSTEM SETUP > GAS/OIL

When in electric heat, the indoor blower (G) cycles with the call for heat.

GO TO: MENU > INSTALLER SETTINGS > SYSTEM SETUP > ELECTRIC

Fan ONThe indoor blower is ON continuously regardless of whether

the heating or cooling equipment is running.

Thermostat Off" ModeIn this mode, the heating and cooling and

81M282 Stage Heat & Cool Heat Pump

Table 6. 81M28 LED Indicators

AUX W2 is active.

CHECK 24V signal is present on the L" terminal

EMER Emergency heat is enabled in menu.

Table 7. 81M28 Terminal Designations

R 24 Vac power input from HVAC system

C 24 Vac common

Y1 Energized on for 1st stage HEAT or COOL (heat pump com-

pressor control)

Y2 Energized on call for 2nd stage COOL

E/W1* Energized on call for emergency heat

W2* Energized on for 2nd stage HEAT

G Energized on call for FAN

H Energized on a call for humidification

D De−energized on a call for dehumidification (reverse logic)

O COOL active (always energized when the stat is in COOL

mode, default value is OFF)

B HEAT active (always energized when the stat is in HEAT

mode, default value is ON)

L Illuminates CHECK LED when energized with 24VAC

* Factory-installed jumper between E/W1 and W2.

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NOTE − High−temperature PEPI disables W2, E and Y1 (in heat mode only) when ambient temperature exceeds 95F.

Table 8. 81M28 Output Characteristics

(with electric heat backup and no outdoor sensor)

Mode Outputs Activated

First−stage heat pump − cool Y1, G, O

Second−stage heat pump − cool Y1, G, O, Y2

First−stage heat pump − heat Y1, G, B

Second−stage heat pump − heat (Combination of heat pump and electric backup heat)

Y1, G, B, W2

First−stage emergency heat E/W1, G, B

Second−stage emergency heat E/W1, G, B, W2

81M28 Output Characteristics (with electric or gas (dual fuel) heat backup and outdoor sensor)

The above output characteristics become restricted when high and low balance points are used.

1. Balance points are used only when the outdoor temperature sensor (46M98) is attached to the unit.

2. When the thermostat is in heat mode and a heat demand exists, if the temperature measured by outdoor sensor is below the low balance point, the heat pump is turned off and only the electric (or gas) heat can cycle.

3. When the thermostat is in heat mode and a heat demand exists, if the temperature measured by outdoor sensor is above the high balance point, the electric (or gas) heat is turned off and only the heat pump can cycle.

4. When the thermostat is in heat mode and a heat demand exists, if the temperature measured by outdoor sensor is between the high and low balance points, both the heat pump and electric (or gas) heat and can cycle.

5. Emergency heat is enabled whenever it is selected by the user (and a heat demand exists) and is NOT restricted by the balance points.

NOTE − See figure 7 for a detailed flowchart of Dual Fuel operation.

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Fan AutoIn COOLING, the indoor blower cycles with calls for Cooling.

In HEAT, and with the thermostat set for standard, the indoor blower (G) cycles with a call for first stage of heating. Note the indoor blower and compressor stay on when the second stage of heating activates.

GO TO: MENU > INSTALLER SETTINGS > SYSTEM SETUP > STANDARD−COMP=ON

When in add−on heat, the indoor blower (G) again cycles with the call for first stage heat. Note that the compressor turns off (comp=off) when the second stage of heat activates, but the indoor blower remains on.

GO TO: MENU > INSTALLER SETTINGS > SYSTEM SETUP > ADD ON−COMP=OFF

Fan ONThe indoor blower is ON continuously regardless of whether

the heating or cooling equipment is running.

Thermostat Off" ModeIn this mode, the heating and cooling and

H/D terminals are inactive. The O or B terminal is active. This is determined by the last state of O/B. For example, if the mode goes from Heat (B active) to Off, then B will be active in the Off mode. Default on power−up is B active. The G terminal may be active if FAN ON is selected from the menu.

System SetupDefault setting is STD (STANDARD−COMP=ON). The

auxiliary heat may be configured for standard or ADD on. Standard means the auxiliary stage supplements the compressor stage (the compressor and auxiliary are on at the same time). Add−on (ADD ON−COMP=OFF) means that the compressor turns off before the auxiliary turns on. When the auxiliary turns off, the compressor may turn on again.

Low Balance PointDefault setting is 25°F. This option will only be

available if an outdoor sensor is installed. If the outside temperature is below the programmed low balance point, then the compressor stage operation is disallowed. This protects the compressor from operation and damage in cold outdoor temperatures. Also, if the heat pump is not effective at a low outdoor temperature, then it is more comfortable and efficient to go directly to the second stage. The options are from −20°F to the high balance point temperature in 1.0°F steps.

High Balance PointDefault setting is 50°F. This option is only avail-

able if an outdoor sensor is installed. If the outside temperature is above the high balance point, then the auxiliary heat stage is disallowed. This prevents the expensive auxiliary heat stage from operating, and makes the low

cost heat pump satisfy the call. Both the compressor and auxiliary heat may not be disabled at the same time by the low and high balance points.

SignatureStatt Humiditrol® Logic Diagram

RUN EQUIPMENT

IN NORMAL

HEATING MODE

RUN EQUIPMENT

IN NORMAL

COOLING MODE

DEACTIVATE

ALL

EQUIPMENT

81M SignatureStatt Equipment Operation with Humiditrol® Enabled

IS THERE A

HEATING

DEMAND?

start

IS THERE A

COOLING

DEMAND?YES

IS THERE A

DEHUMIDIFICATION

DEMAND?

YES

COOLSET – HEATSET

> DBND

IS INTEMP >

COOLSET – DBND

+2ºF

IS INTEMP >

2ºF ABOVE

HEATSET

run

Humiditrol

LEGEND:

COOLSET = COOLING SETPOINT DBND = DEADBAND HEATSET = HEATING SETPOINT INTEMP = INDOOR TEMPERATURE

YES

IMPORTANT!

HUMIDITROL® IS NOT ALLOWED TO RUN IF:

S OUTDOOR

TEMPERATURE IS GREATER THAN 95ºF OR,

S INDOOR

TEMPERATURE IS LESS THAN 65ºF.

YES

Figure 6

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Figure 7 shows a Dual Fuel Flowchart for 81M28 Thermostat.

Figure 7

Dual Fuel Flowchart for 81M28 Thermostat

Abbreviations: aux = auxiliary comp = compressor LBP = Low Balance Point temp = temperature tstat = thermostat

Gas heat lockout (when set for aux heat = add (comp = off))

De−energize

Y1 & G

Energize

Heat pump lockout (when set for aux heat = add (comp = off))

YES

Outdoor

temp above

LBP

De−energize

Energize

Y1, B & G

YES

De−energize

2nd stage

heat demand

Indoor

tstat heat

demand

2nd stage

heat demand

Indoor

tstat heat

demand

2nd stage

heat demand

Indoor

tstat heat

demand

De−energize

Outdoor

temp above

LBP

YES

YES YES

YES

Wiring DiagramsThermostat wiring connections with various units,

including dual fuel, zone control, and applications that include the Humiditrol® accessory. See figures 8 and 9.

Figure 8

Typical Condensing Unit/Humiditrol

Accessory

Wiring Diagram

RED

YEL

BLU

BLK

BRN

SignatureStat

THERMOSTAT

INDOOR UNIT

OUTDOOR UNIT

TWISTED PAIR

PUR

OUTDOOR SENSOR (46M98)

BLK

Y1Y2 JUMPER − IN FOR SINGLE− STAGE COOLING; REMOVED FOR 2−STAGE COOLING

RED

BLK

PUR

EDA UNIT

FAN RELAY

NOTES − /1\ NOT REQUIRED FOR APPLICATIONS WITHOUT LSOM /2\ NOT REQUIRED WITH SINGLE-SPEED OUTDOOR FAN) /3\ NOT REQUIRED FOR SINGLE STAGE /4\ ON 81M28 MODEL, E/W1 AND W2 TERMINALS MUST BE JUMPERED

TOGETHER FOR MOST APPLICATIONS

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Figure 9

Wiring Diagrams

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Lennox SignatureStat 81M26, SignatureSu0001tat 81M27, SignatureSu0001tat 81M28 Programming And Application Manual

Specifications and Main Features

Frequently Asked Questions

User Manual