Step 3—Install Thermostat
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing thermostat, turn off all power to unit. There
may be more than 1 power disconnect.
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 (mounting base) to expose mounting holes.
The base can be removed to simplify mounting. Snap apart
carefully to separate mounting base from remainder of ther-
mostat.
NOTE: If thermostat will not separate, insert a small screwdriver
into top slots for ease of opening.
4. Route thermostat wires through large hole in mounting base.
Level mounting base against wall (for aesthetic value
only—thermostat need not be leveled for proper operation)
and mark wall through 2 mounting holes.
5. Drill two 3/16-in. mounting holes in wall where marked.
6. Secure mounting base to wall with 2 anchors and screws
provided, (additional anchoring holes available for more
secure mounting if needed) making sure all wires extend
through hole in mounting base.
7. Adjust length and routing of each wire to reach proper
terminal and connector block on mounting base with 1/4 in. of
extra wire. Strip only 1/4 in. of insulation from each wire to
prevent adjacent wires from shorting together when con-
nected.
8. Match and connect equipment wires to proper terminals of the
connector blocks. (See Table 1.)
ELECTRICAL OPERATION HAZARD
Failure to follow this caution may result in equipment damage
or improper 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 any excess wire into wall and against mounting base.
Seal hole in wall to prevent air leaks. Leaks can affect
operation.
10. Snap case back together.
11. Close thermostat assembly making sure pins on back of circuit
board align with sockets in connector.
12. Turn ON power to unit.
NOTE: If a common wire has not been connected, two AA
batteries must be used to power the thermostat.
On power up, LCD readout will display AC, HP, A2, or H2
depending on the thermostat model status. See "Power On Check"
under "Operational Information" on page 11 for explanation.
Step 4—Set Thermostat Configuration
Configuration options are intended to be selected at installation
and are normally not modified by the home owner. 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 configuration mode. The thermostat will automatically exit
this mode if no button is pressed for 3 minutes. While in the
configuration mode, up to 14 option choices can be made:
Option 01: Anticipator setting
Option 02: Clean filter setting
Option 03: Fahrenheit or Celsius selection
Option 04: Enable fan (G) on with W/W1 output
Option 05: HP / AC
Option 06: Cooling Lockout (available only if an outdoor air
temperature sensor is present)
Option 07: Enable zoning
Option 08: Auxiliary heat lockout temperature adjustment (avail-
able only on heat pump systems and if an outdoor air temperature
sensor is present)
Option 10: O (reversing valve) ON with Heat or Cool (present on
Heat Pump models only)
Option 13: Room temperature offset adjustment
Option 15: Enable AUTO mode
Option 18: Backlight Configuration
Option 19: Equipment Present
Option 21: Keypad Lockout
Table 1—Model Selection and Wiring Diagram Chart
OUTDOOR UNIT
AIR CONDITIONER HEAT PUMP
1 Speed 2 Speed 1 Speed 2 Speed
1-Stage
Furnace
Model AC
See Fig. 2
Model 2S
See Fig. 8
Requires
Dual Fuel Thermostat
Requires
Dual Fuel Thermostat
2-Stage
Furnace
Model AC
See Fig. 3
Model HP
See Fig. 5
Model 2S
See Fig. 9
Requires
Dual Fuel Thermostat
Requires
Dual Fuel Thermostat
Typical Fan Coil
Model AC
See Fig. 4
Model HP
See Fig. 6
Model 2S
See Fig. 10
Model HP
See Fig. 7
Model 2S
See Fig. 11
Variable-Speed
Fan Coil
(FK4D, FV4, 40FK)
Model AC
See Fig. 12
Model HP
See Fig. 13
Model 2S
See Fig. 14
Model HP
See Fig. 15
Model 2S
See Fig. 16
2
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