Emerson 1F95-1280, Installation And Operating Instructions Manual

Page: 2 / 16

Remove Old Thermostat
Before removing wires from old thermostat, mark wires for
terminal identification so the proper connections will be made
to the new thermostat .
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 snugly,
use plastic screw anchors to secure the base .
4 . 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 .
5 . Connect wires to terminal block on base using appropriate
wiring schematic .
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 .
7 . Carefully line the thermostat up with the base and snap
into place .
Battery Location
2 "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 1) . For best results, use a premi-
um brand "AA" alkaline battery such as Duracell
® or Ener-
gizer
®
. 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 .
Power Stealing Switches
The Power Stealing Switches (Fig . 1) should be left in the
"On" position for most systems . The information in the
following table details the thermostat power method and
switch options .
WARNING
!
Thermostat installation and all components of the
control system shall conform to Class II circuits per
the NEC code.
INSTALLATION
Figure 1 – Thermostat Base Multi-Stage 1F95-1280
2 "AA" Batteries
Power
Stealing
Switches
Stack
Power
Stealing
Switch
Mounting
Hole
Mounting
Hole
Place Level
across Mounting Tabs
(for appearance only)
Place Level
across Mounting Tabs
(for appearance only)
+
S
A1
-
W/E
6
Y2
O/B
L
Y
W2
Rear view of thermostat
Thermostat Power Method Switch Position/Description
Battery Powered,
no 24
Volt system power available .
Switches
"On"
, thermostat
runs on batteries .
Hardwired with Battery
Back-up,
for 24 Volt systems
with common connection from
transformer to "C" terminal
on thermostat .
Switches "On" , thermostat
runs on power directly from
transformer with battery back-
up .
*Battery Powered with
Power Stealing Assist,
for 24 Volt systems with no
common connection from
transformer to "C"
terminal on
thermostat .
Switches "On" , thermostat
runs on batteries and
supplemental power drawn
through the heat or cool circuit .
*Power Stealing Assist is very reliable to increase battery life,
but on a small number of heating or cooling systems with high
impedance electronic modules you may observe one of the
following conditions:
1 . The furnace draft inducer motor may run with no call for
heat .
2 . The furnace fan may turn on with no call for heat or may
not turn off .
3 . The furnace may not turn off when the call for heat ends .
4 . The air conditioner may not turn off when the call for cool
ends .
If the Power Stealing Assist method is not compatible with
your system, place the Power Stealing Switches to
"Off" . This
cancels Power Stealing Assist, operates the thermostat on
batteries and corrects the condition .
2