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OUTDOOR
UNIT
1-Stage
Furnace
2-Stage
Model AC
Furnace
See Fig. 3
Model AC
Fan Coil
See Fig. 4
Step 3—Install Thermostat
Before installing thermostat, turn off all power to unit. There
may be more than 1 power disconnect. Electrical shock can
cause personal injury or death.
1. Turn OFF all power to unit.
2. If an existing thermostat is being replaced:
a. Remove existing thermostat from wall.
b. Disconnect wires from existing thermostat, 1 at a time. Be
careful not to allow wires to fall back into the wall.
c. As each wire is disconnected, record wire color and
terminal marking.
d. Discard or recycle old thermostat.
NOTE: Mercury is a hazardous waste and MUST be disposed of
properly.
3. Open thermostat rear door (mounting base) to expose mount-
ing holes. The base can be removed to simplify mounting.
Snap apart carefully at hinge to separate mounting base from
remainder of thermostat.
4. Route thermostat wires through large hole in mounting base.
Allow an extra 6 to 8 in. of wire for connection to terminals.
Remove outer sheath over this entire length for added flex-
ibility.
5. Level mounting base against wall and mark wall through 2
mounting holes.
6. Drill two 3/16-in. mounting holes in wall where marked.
7. Secure mounting base to wall with 2 anchors and screws
provided, making sure all wires extend through hole in
mounting base.
8. Adjust wire length and routing to allow proper closure of
thermostat. Strip each wire end no more than 1/4 in. to prevent
adjacent wires from shorting together. Match and connect
equipment lead wires to the correct terminals of the thermostat
connector. (See Table 1 and Fig. 2 through 13.) Both R and C
must be connected for proper thermostat operation.
Improper wiring or installation may damage the thermostat.
Check to make sure wiring is correct before proceeding with
installation or turning on unit.
9. Push excess wiring into wall. Seal hole in wall to prevent
drafts.
10. Snap hinge back together.
11. Close thermostat assembly.
12. Turn ON power to unit.
On power up, LCD readout will display AC, HP, A2, or H2
depending on the thermostat model and jumper status.
Table 1—Model Selection and Wiring Diagram Chart
AIR CONDITIONER
1 Speed
Model AC
See Fig. 2
Model HP
See Fig. 5
Model HP
See Fig. 6
2 Speed
Model 2S
See Fig. 8
Dual Fuel Thermostat
Model 2S
See Fig. 9
Dual Fuel Thermostat
Model 2S
Model HP
See Fig. 10
See Fig. 7
→
Step 4—Set Thermostat Configuration
Configuration options, like the R19 configuration jumper are
intended to be selected at installation and are normally not
modified by the homeowner. These options are not discussed in the
Homeowner's Guide and therefore must be made as part of the
installation. A special procedure allows entry into the configura-
tion mode. The thermostat will automatically exit this mode if no
button is pressed for 1 minute. While in the configuration mode, 6
option choices can be made:
1. Anticipator—Value Adjustment.
2. Zoning ON/OFF—Selection.
3. Fahrenheit/Celsius—Selection.
4. Clean Filter Timer—Selection and Value Adjustment.
5. Fan (G) ON/OFF with Heat (any W)—Selection.
6. High-Ambient Auxiliary Heat Lockout—Selection and Value
Adjustment.
An explanation for each of these and how to enter the configura-
tion mode follows.
To enter the configuration mode:
Press and hold the FAN button for approximately 10 sec until
room temperature disappears and display reads "1-". You are now
in the configuration mode.
NOTE: If the FAN button is pressed again or if no button is
pressed for 60 sec, the thermostat will exit the configuration mode
and return to normal operation. To re-enter the configuration
mode, the FAN button must be pressed and held for 10 sec again.
While in configuration mode, these option choices are available:
1- Anticipator—Value Adjustment
This adjustment controls the sensitivity and cycle rate of the
thermostat. Higher numbers decrease the sensitivity and slow the
cycle rate. Lower numbers increase sensitivity and increase cycle
rate. However, a limiting feature will not allow more than 4
equipment cycles per hour, regardless of setting. Values can range
from 1 to 9. Factory default setting is 3. This default selection will
provide optimum performance in nearly all installations. Try it
first. Do not change setting unless there is evidence of need to do
so.
Unlike conventional anticipators, this setting is not to be deter-
mined by current draw. There is no need to measure, know, or
compensate for current. There is also no droop with this thermo-
stat, regardless of anticipator setting. This adjustment controls only
sensitivity and cycle rate up to the maximum of 4 cycles per hour.
TO ADJUST:
1. Enter configuration mode (if not already there).
2. Use up and down buttons to display 1-.
3. Press MODE button once to display current value between 01
and 09. Factory default is 03.
4. Use up and down buttons to move between values.
2
HEAT PUMP
1 Speed
2 Speed
Requires
Model 2S
See Fig. 11
Requires
Model 2S
See Fig. 12
Model 2S
See Fig. 13
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