2 "AA" alkaline batteries are included in the thermostat. To in-
stall 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. Once fully
down, snap the door back into position.
Thermostat installation and all components of the control
system shall conform to Class II circuits per the NEC
Remove Old Thermostat
To replace the batteries, set system to OFF, following the
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
Figure 1 – Battery door shown open
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 the wall.
“AA” Alkaline Batteries
Installing New Thermostat
1. Pull the thermostat body off the thermostat base. Forcing
or prying on the thermostat will cause damage to the unit.
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 op-
tional battery back-up. When battery power remaining is ap-
proximately half, the will be displayed. When "Cambiar
" is displayed, install fresh “AA” alkaline batteries imme-
diately. For best results, replace all batteries with a premium
brand alkaline battery such as Duracell® or Energizer®. We
recommend replacing batteries every 2 years. If the home is
going to be unoccupied for an extended
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 snugly,
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.
period (over 3 months) and
is displayed, the batter-
ies should be replaced before leaving. When less than two
months of battery life remain, the setpoint temperature will
offset by 10 degrees (10 degrees cooler in Frio mode / 10
degrees warmer in Frio mode). If offset occurs, the normal
5. Connect wires to terminal block on base.
6. Push excess wire into wall and plug hole with a ﬁre resis-
tant material (such as ﬁberglass insulation) to prevent
drafts from affecting thermostat operation.
setpoint can be manually reset with
7. Carefully line the thermostat up with the base and snap
offset will occur within two days if batteries are not replaced.
Figure 2 – Thermostat base and rear view of thermostat
(Conventional or Heat Pump Selection)
The SS/HP switch is factory set to the SS position. In this posi-
tion, 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).
(for appearance only)
(for appearance only)
Gas/Elec Switch (Fan Option)
The GAS/ELEC 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 cool.
If your system requires that the thermostat power the circula-
tor 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
When the thermostat is conﬁgured for Heat Pump, the thermo-
stat will always power the circulator fan on a call for heat in the