Emerson Sensi 1F87U-42WF Installation guide

Sensi™
Wi-Fi Thermostat
1F87U-42WF Installation Training

2
Sensi Wi-Fi Thermostat
Key Features
•Universal application (single-
stage, multi-stage and heat
pump)
•Compatible with popular smart
home platforms
•Contractor-On-Call feature
•Geofencing, flexible scheduling and
remote access can save homeowner’s
on energy costs.
•Smart alerts
•Keypad lockout
•Multi thermostat control

3
Compatibility and common wire
(c-wire) requirement
No common wire
required
•Conventional heating
and cooling systems
Common wire required
•Apple HomeKit
•Heat only or Cool
only (2 wire)
•Heat pumps
Not compatible
•Millivolt systems
*External 24 VAC Transformer
is an option
•Communicating
systems
•Line voltage systems
•Accessory control

44
Terminal outputs
The common wire could be labeled “C”, “B” or “X” on the old thermostat. Please refer to
the owner’s manual of the old thermostat.

5
What if I don’t have a common wire and need one?
There are a few options if the application does not have or will not allow the
pulling of a common wire (c-wire) through the wall.
1. Look for an unused wire in the thermostat cable bundle
–Video: Using an extra, unused wire as a common wire
2. Use the “G” (Fan wire)
–Video: Using a g-wire (fan wire) as a common wire
3. Install an Emerson Thermostat Common Wire Kit
–Video: Using an Emerson Thermostat Common Wire Kit

66
Do I need a RC/RH jumper?
•Sensi Wi-Fi Thermostat has a built
in RC/RH jumper, no need to field
install a jumper
•If you have separate wires to RC
and RH terminals (two transformer
systems)
–Label the wires RC and RH
separately and then clip the
jumper wire on the back of the
Sensi face plate.
•Sensi Wi-Fi Thermostat has a
jumper built in on the back of the
thermostat
No jumpers required RC/RH jumper location
No jumpers are required when installing the Sensi Wi-Fi Thermostat

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Heat pump jumper wires
•Some thermostats will may have additional jumpers installed
•Remove the jumper and label as shown below

8
Heat pump wiring exceptions
•Both wires will be labeled W/E and
attached to the same terminal. •“B” terminal can be used for more
than one. Here is the solution to
cross.
–If there is a wire on the “O” terminal,
label the B wire C
–If there is no wire on the “O” terminal,
label the B wire O/B
Separate W2 and E Wires B Terminal Wires

99
Wiring - single transformer –conventional
single stage or two stage systems
Special notes
*Internal jumper between RC and RH, located on back of thermostat
above the battery compartment
*Common connection required for Heat only or Cool only systems
Quick tip: Thermostat wiring does not follow a standardized color code. Take a picture
with your smart phone and label thermostat wires before removing old thermostat
from the wall.

1010
Wiring - two transformer - conventional
single stage or two stage systems
Special notes
*Two transformer systems (separate RC and RH Transformers, clip the internal RC/RH
jumper located on back of thermostat above the battery compartment
Clip the
jumper on the
back of the
thermostat
Quick tip: Thermostat wiring does not follow a standardized color code. Take a picture
with your smart phone and label thermostat wires before removing old thermostat
from the wall.