Models
81M26
,
81M27
and
81M28
Quick Start Installation Manual
111-318E
504,683M
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.
Select location for installation.
Mark mounting hole locations on wall.
Drill
3
/
16
” holes at marked locations on
wall. Insert plastic anchors into holes.
Align unit base over plastic anchors
embedded in wall and secure with the
screws provided.
Connect wiring between unit and
furnace. For Model 81M26 (1H/1C
furnace applications):
6
1-1/2"
1"
opening
out
Cut
1/4"
a
b
Mark mounting hole
locations on wall using
unit base as template.
Drill
3
/
16
holes
a
b
Press anchors into holes until flush.
Y1
R
C
E/W1
H O B G
Furnace
Terminals*
Wiring
Thermostat
C - Common 24 VAC
R - System transformer
Y1 - 1st stage cooling
W1- 1st stage heating
W2- not used
Y2 - not used
L - System check
O - Cool active reversing valve
B - Heat active reversing valve
G - Fan relay
D - Dehumidification relay
H - Humidification relay
TERMINAL DESIGNATIONS
W2
D
Y2
C
C
H
R
Y1
W1
L
G
L
B
O
* Please refer to furnace
installation manual for
proper terminations
Note: To avoid electrical problems, use the system transformer for both
the thermostat and humidifier.
81M26
Humidifier
DS
Remove 1/4” of insulation
from end of each wire
DELUXE
PROGRAMMABLE
THERMOSTATS
Open the case with a screwdriver. Place
in slot and gently pry forward at all four
locations.
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