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.
1
Mark mounting hole locations on wall.
3
Drill
3
/
16
” holes at marked locations on
wall. Insert plastic anchors into holes.
4
Align unit base over plastic anchors
embedded in wall and secure with the
screws provided.
5
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.
2
1
2
3
4
