Once fully down, snap the door back into position. To
replace the batteries, set system to OFF, following the
Thermostat installation and all components of the
control system shall conform to Class II circuits per
the NEC code.
Figure 1 – Battery door shown open
Remove Old Thermostat
“AA” Alkaline Batteries
A standard heat/cool thermostat consists of three basic parts:
1. The cover, which may be either a snap-on or hinge type.
2. The base, which is removed by loosening all captive screws.
3. The switching subbase, which is removed by unscrewing
the mounting screws that hold it on the wall or adapter
plate. Before removing wires from old thermostat,
label each wire with the terminal designation from
which it was attached. Disconnect the wires from the old
thermostat one at a time. Do not let wires fall back into
Thermostat can be powered by system AC power or Battery.
is displayed the thermostat is battery powered. If
is not displayed, thermostat is system powered with
optional battery back-up. When battery power remaining is
approximately half the will be displayed. If the home is
going to be unoccupied for an extended period (over 3
months ) and is displayed, the batteries should be
replaced before leaving. When Change is displayed,
install fresh “AA” alkaline batteries immediately. The setpoint
temperature will offset by 10 degrees (10 degrees cooler in
heat mode / 10 degrees warmer in Cool mode) when less
than two months of battery life remain. (If offset occurs the
Installing New Thermostat
1. Pull the thermostat body off the thermostat base. Forcing
or prying on the thermostat will cause damage to the unit.
2. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.
3. Move base out of the way. Drill mounting holes. If you
are using existing mounting holes and the holes drilled
are too large and do not allow you to tighten base snug-
ly, use plastic screw anchors to secure the base.
4. Fasten base snugly to wall using mounting holes shown
in Figure 2 and two mounting screws. Leveling is for
appearance only and will not affect thermostat operation.
5. Connect wires to terminal block on base.
normal setpoint can be manually reset with
batteries are not replaced another offset will occur within two
Figure 2 – Thermostat base and rear view of thermostat
6. Push excess wire into wall and plug hole with a fire re-
sistant material (such as fiberglass insulation) to prevent
drafts from affecting thermostat operation.
7. Carefully line the thermostat up with the base and snap
(for appearance only)
(for appearance only)
(Conventional or Heat Pump Selection)
The SS/HP switch is factory set to the SS position. In this
position, thermostat is configured as conventional single
stage. If you have a single stage heat pump system, switch
SS/HP to HP position (see figure 2).
Electric/Gas Switch (Fan Option)
The ELEC/GAS switch is factory set to the GAS position. In
this position, the thermostat will not power the circulator fan
on a call for heat, but will power the circulator on a call for
If your system requires that the thermostat power the
circulator fan on a call for heat, this switch should be set to
the ELEC position. Typically, gas and oil heating systems do
not require the thermostat to power the circulator fan during
a call for heat. If your heat is gas or oil, the switch should be
set to the GAS position.
Refer to equipment manufacturers' instructions for specific
system wiring information. After wiring, see CONFIGURA-
TION section for proper thermostat configuration.
TERMINAL DESIGNATION DESCRIPTIONS
When the thermostat is configured for Heat Pump, the
thermostat will always power the circulator fan on a call for
heat in the HEAT mode.
O/B . . . . . Changeover valve for heat pump
Y . . . . . . Compressor Relay
2 "AA" alkaline batteries are included in the thermostat. To
install the batteries, pull the battery door as shown by the
arrow and lift open. Using the polarity indicated inside the
battery door, insert the batteries. To close the battery door,
swing the door down while pulling in the direction of arrow.
W . . . . . . Heat Relay
G . . . . . . Fan Relay
RH . . . . . Power for Heating
RC . . . . . Power for Cooling
C . . . . . . Common wire from secondary side of cooling
system transformer or heat only system transformer