Disassembly; Mount Base To Wall - Aprilaire 8870 Installation Instructions Manual

DO NOT
locate the thermostat:
• Behind doors, in corners or other dead air spaces.
• In direct sunlight or near lamps, appliances or other sources of radiant heat.
• On an outside wall or wall exposed to an unconditioned space (i.e. garage, etc.).
• In the flow path of a supply register, in stairways or near outside doors.
• On a wall where concealed pipes and/or ductwork will affect the thermostat.
• Near sources of electrical interference such as arcing relay contacts.
WITH REMOTE TEMPERATURE SENSORS
Follow the guidelines for placement of the sensors and locate the thermostat indoors where
operating range (see specs) will not be violated (i.e. do not install in a cold garage or hot
equipment room). See the sensor installation literature for additional details.

4. DISASSEMBLY

No tools required – use hands to pull the front
panel off of the base ( Figure 2 ). While holding
the base of the thermostat, apply pressure to the
base of the latch with your thumb ( Figure 3 ).
Both sides have a latch, but it is easiest to
unlatch one side at a time.
CAUTION: Loss of internal programs may result from static discharge to thermostat circuit
board. Installer must touch a grounded metal object before handling the circuit board.
4
FIGURE 3

5. MOUNT BASE TO WALL

There are four screw holes located on the base of the thermostat; two are for a junction box
mounting, along with two for alternate mounting spacing. Use one of the holes on the top
and one on the bottom.
a) Place the base over the wire hole opening in the wall; level the base and mark the screw
hole mounting locations (leveling required for appearance only).
b) If using supplied wall anchors, drill 3/16" hole in the center of the marked locations and
tap in the wall anchors. If using the supplied screws only, drill a 3/32" hole in the center
FIGURE 2 of the marked locations.
c) Fasten the base to the wall with the supplied screws.
d) Seal wire entry using caulk, drywall putty or insulation.
CAUTION: Minimize wire entry hole size and seal – drafts from
inside the wall could affect temperature readings.
Press
base here
Latch
5