Lennox SignatureStat 81M26 Quick Start Installation Manual

DELUXE
PROGRAMMABLE
THERMOSTATS
81M26 81M27 81M28
Models , and
Quick Start Installation Manual
111-318E
504,683M
3
Mark mounting hole locations on wall.
Mark mounting hole
locations on wall using
unit base as template.
Installation DOs and DON'Ts
DO
• Shut off all power to system before installing.
• Read entire manual before installing.
• Make sure that all wiring conforms to national and
local codes.
• Use twisted pair cabling (84X49) between the
SignatureStat and the outdoor temperature sensor.
• Consult the SignatureStat Service and Application
Manual 504,993M.
• If used with the Harmony II zoning panel, consult
Service and Application Note H-04-5.
DO NOT
• Install on voltages greater than 30 VAC.
• Short jumper across terminals on the gas valve or
at the system control.
• Install on outside walls or in direct sunlight.
• Use with commercial HVAC equipment.
4 3
Drill / " holes at marked locations on
16
wall. Insert plastic anchors into holes.
Drill 3 / 16 holes
a
b
Press anchors into holes until flush.
1
Select location for installation.
1"
a
Cut
1-1/2"
out
opening
1/4"
Remove 1/4" of insulation
from end of each wire
5
Align unit base over plastic anchors
embedded in wall and secure with the
screws provided.
2
Open the case with a screwdriver. Place
in slot and gently pry forward at all four
locations.
b
2
1
4 3
6
Connect wiring between unit and
furnace. For Model 81M26 (1H/1C
furnace applications):
Thermostat
TERMINAL DESIGNATIONS
C - Common 24 VAC
R - System transformer
Y1 - 1st stage cooling
C
R
W1- 1st stage heating
Y1
W2- not used
E/W1
Y2 - not used
D
L - System check
W2
Y2
O - Cool active reversing valve
L
B - Heat active reversing valve
G - Fan relay
H O B G
81M26
D - Dehumidification relay
H - Humidification relay
C
R
Y1
W1
C
L
G
Humidifier
B
O
H
DS
* Please refer to furnace
installation manual for Wiring
Terminals*
proper terminations
Note: To avoid electrical problems, use the system transformer for both
the thermostat and humidifier.
Furnace