3
ATTACH THERMOSTAT BASE TO WALL
FIGURE 2 – Typical wiring diagram for heat only, 4-wire,
single transformer systems
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
TRANSFORMER
Heating
System
Fan
Relay
JUMPER
WIRE
For Heat only,
attach to RH and W
NOTE
FIGURE 3 – Typical wiring diagram for cool only, 4-wire,
single transformer systems
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER
THERMOSTAT
SYSTEM
Cooling
System
Fan
Relay
JUMPER
WIRE
FIGURE 4 – Typical wiring diagram for heat/cool, 5-wire,
single transformer systems
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
TRANSFORMER
Heating
System
Fan
Relay
Cooling
System
JUMPER
WIRE
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
for proper thermostat operation with this system.
NOTE
FIGURE 5 – Typical wiring diagram for heat/cool, 6-wire,
two transformer systems
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
HEATING
TRANSFORMER
Heating
System
Fan
Relay
Cooling
System
24 VAC
120 VAC
Hot
Neutral
COOLING TRANSFORMER
FIGURE 6 – Typical wiring diagram for heat pump with
reversing valve energized in COOL
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
TRANSFORMER
Reversing
Valve*
JUMPER
WIRE
Compressor
Contactor
JUMPER
WIRE
*Reversing valve is energized when the
system switch is in the COOL position
Fan
Relay
FIGURE 7 – Typical wiring diagram for heat pump with
reversing valve energized in HEAT
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
TRANSFORMER
Reversing
Valve*
JUMPER
WIRE
Compressor
Contactor
JUMPER
WIRE
*Reversing valve is energized when the
system switch is in the HEAT position
Fan
Relay
6. Wire the thermostat.
IMPORTANT! ENSURE THE POWER AT
THE HVAC EQUIPMENT IS OFF.
a. Make sure the fan switch is set to Auto and the Mode switch is
set to Off.
b. Strip 3” of cable insulation.
c. Strip 3/8” of insulation from each wire. Do not cut into the wire
when stripping insulation, as this can lead to eventual control
failure.
d. Secure the wires to the thermostat terminal strip according to
the wiring diagram for the model being installed (see
Figures
2 through 7
). Use a fl at screw driver with a 1/8” tip (terminal
screw driver). Use color coding where possible (i.e. red wire to
R terminal, white wire to W terminal, etc.).
e. Slide excess cable back into the wire entry wall opening and fi ll
the hole with insulation. Failure to seal the hole can cause drafts
to enter the thermostat and affect temperature sensing accuracy.
1. Remove the packing material from the thermostat. Gently pull the
cover straight off the base. Forcing or prying on the thermostat will
cause damage to the unit. Loss of internal programs may result from
static discharge to thermostat circuit board. Please touch a grounded
metal object before handling the thermostat. If necessary, move the
ELECTRIC/GAS
switch (see
ELECTRIC HEAT
on page 2).
2. Connect wires beneath terminal screws on base using appropriate
wiring schematic (see
Figures 2 through 7
).
3. Place base over wire access hole in wall, level for appearance, and
mark mounting hole locations on wall using base as a template.
4. Move base out of the way. Drill mounting holes with 3/16 inch drill bit.
5. Fasten base loosely to wall using two mounting screws as shown
in
Figure 1
. Place a level against bottom of base, adjust until level,
and then tighten screws. (Leveling is for appearance only and will not
affect thermostat operation.) If you are using existing mounting holes,
or if holes drilled are too large and do not allow you to tighten base
snugly, use plastic screw anchors to secure sub-base.
