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69-0653-6 INSTALLATION
7
Heating System Table
Note
: Setting the screw “out one turn” means turning the screw 360° counter-clockwise, or one complete turn.
Step 5. Wire the thermostat terminals
Type of system Screws A and B Fuel switch
Warm air, gas, or oil heating system with an efficiency rating under 90%.
(The furnace efficiency rating should be on the furnace.)
Use factory setting
A–leave in
B–leave in
F
High-efficiency furnace such as a 90% or greater AFUE (Average Fuel
Utilization Efficiency) unit
A–out one turn
B–leave in
F
Hot water boiler A–out one turn
B–leave in
F
Electric furnace A–leave in
B–out one turn
E
Fig. 9
Fig. 10
a. Hold the thermostat as shown in Fig. 9.
b. Using the labels on the wires, match the letter of your old
thermostat wire with the corresponding terminal on the back of
your new thermostat.
Note:
If the letters on the old thermostat terminals do not match
the letters on the new thermostat terminals, you might not need
to connect all of the old wires to the new thermostat. See the
special wiring instructions on page 9 for details.
c. Loosen the terminal screws and slip each wire beneath its
matching terminal (Fig 10).
d. Securely tighten the terminals.
W
Y
G
R
M20125
INSERT
STRAIGHT
UNDER
SCREW HEAD
5/16 in.
(8 mm)
STRIP
END OF WIRE
VISIBLE HERE
M20126