Lennox SignatureS
tat 81M26 Programming And Application Manual 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 high-
light HUMIDIFY. Then press SE-
LECT 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 SE-
LECT.
6. In the HUMIDIFY CONTROL
screen, use the UP/DOWN but-
tons to adjust the desired relative
humidity. At the desired level,
press SELECT.
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
↑
44 %
↓
HUM MENU SELECT
Page 7
The humidification adjustment control may be adjusted in 1 percent
increments; dew point range. Setting limits: Min. 15%, Max. 45%. De-
fault 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 ter-
minal 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 ac-
tive 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 ac-
tive, must elapse before the HUMIDIFIER MAINTENANCE screen is dis-
played.
When the interval has expired, the
screen will appear as shown to the
right. Press DELAY to be reminded lat-
er 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 ter-
minal 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.
HUMIDIFIER
MAINTENANCE
LENNOX, INC.
1−800−9LENNOX
DELAY RESET
SignatureStat t Thermostat