Installation and User Guide
4
Part No. 37-7775005
09/2020 11-HD17D1-1C-EN
4. Installation
4.1 Location
The
302 and 303
is designed for installation in climate controlled
living spaces. Place the unit in a central location with good
circulation.
For proper temperature sensing, avoid exposing the
302 and 303
to heat radiated from lamps, sun light, fireplaces or any other
radiant heat source.
Avoid locations close to windows, behind doors or alcoves with
poor air circulation, adjoining outside walls, or doors that lead to
the outside.
Select a location that prevents the 302 and 303 from being directly
exposed to air currents from supply registers or ceiling fans.
Mount the Control on a section of interior wall that does not
contain hot or cold water pipes or duct work.
FIGURE 1. PLACEMENT OF THE 302 AND 303
Incorrect
Placement
Ceiling Fan
Natural heat
dissipation
from the
Touch Screen
Onboard
Thermistor
5 FEET
Optimum
Zone
2 FEET
Correct
Placement
Heat from the screen may be trapped
within the body of the Control by an
external top-down airflow source, such
as a ceiling fan.
The onboard thermistor may be biased
by this heat causing the displayed
indoor temperature to be elevated.
4.2 Mounting / Installation
Follow these steps to mount the
302 and 303
Control to the wall.
1.
Turn OFF all power to heating and cooling equipment.
2.
If an existing thermostat is being replaced:
a. Remove the existing thermostat from the wall.
b. Record color and terminal marking of each wire.
c. Disconnect the wires from the existing thermostat
being careful not to allow them to fall back into the wall.
3.
Pull the thermostat body off the thermostat base. Forcing
or prying on the thermostat will cause damage to the unit.
4.
Place base over hole in wall and mark mounting hole
locations on wall using base as template. (See Fig. 1)
5.
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.
6.
Fasten base snugly to wall using mounting holes shown
in Figure 1 and two mounting screws. Leveling is for
appearance only and will not affect thermostat operation.
7.
Connect wires to terminal block on base using appropriate
wiring diagram.
8.
Push excess wire into wall and plug hole with a fire resistant
material (such as fiberglass insulation) to prevent drafts
from affecting thermostat operation.
9.
Carefully line the thermostat up with the base and snap into
place.
WARNING
!
Thermostat installation and all components of the
control system shall conform to Class II circuits per
the NEC code.
4.3 Battery Location
Two “AA” alkaline batteries are included in the thermostat at the
factory with a battery tag to prevent power drainage. Remove the
battery tag to engage the batteries.
To replace batteries, set system to OFF, remove thermostat
from wall and install the batteries in the rear along the top of
the thermostat (see Figure 2). For best results, use a premium
brand “AA” alkaline battery such as Duracell® or Energizer®. 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.
4.4 Power Stealing Switch
The power stealing switch is set to OFF. Placing the switch in
the ON position may extend battery life. Power stealing is not
compatible with every furnace. Cycle the furnace and verify the
inducer and/or indoor blower do not run continuously or with no
call for heat. If they do, return switch to OFF position.
