Specification Sheet

RC RH C W/E W2 O/BY G Y2/* L
TERMINAL DESIGNATIONS
Sensi Wi-Fi Thermostat
1F87U-42WF
RATED DIFFERENTIALS (@ 6˚F / HR)
Heat (conventional gas/oil/elect):
Cool (central air):
Heat pump (heat and cool):
Heat pump (aux):
Fast Med Slow
0.5˚F 0.75˚F 1.9˚F
0.9˚F 1.2˚F 1.7˚F
0.9˚F 1.2˚F 1.7˚F
0.5˚F 0.75˚F 1.9˚F
SENSI ALERT
High temperature:
Low temperature:
High humidity:
Loss of heat/cool:
Trigger
Above 99˚F
Below 45˚F
Above 78%
Temp goes up or
down 5˚F during cycle
COMPATIBILITY
Conventional heating
and cooling system:
Heat pump*, heat only
and cool only systems:
Power Source
Battery (power sharing)
or hardwired (c-wire)
Hardwired only
(c-wire)
‡Thermostat has internal jumper on RC and RH. On two transformer systems, clip red
jumper wire on thermostat.
DUAL FUEL APPLICATIONS
Automatic staging for heat pump/gas
furnace without the need for outdoor
sensor or additional equipment.
AUTO CHANGEOVER
Automatically switches between heating
and cooling within the set range.
KEYPAD LOCKOUT
Ideal for light commercial applications –
lock the thermostat keypad and keep the
control from the Sensi app.
BACKLIT DISPLAY
Easy-to-read screen in low light.
REMOTE ACCESS
Set, change and program home
comfort from anywhere.
FLEXIBLE SCHEDULING
Program a schedule for each day
of the week.
LOCAL WEATHER
Get easy weather updates.
HUMIDITY SENSOR
Displays indoor humidity on the
thermostat and in the app.
ADVANCED FEATURES
emerson.com/sensipro
The Sensi and Emerson logos are trademarks
and service marks of Emerson Electric Co.
©
2017.
All rights reserved.
ELECTRICAL RATING
20 to 30 VAC, 50/60 Hz
1.5 Amps maximum per terminal
2.5 Amps maximum (all
terminals combined)
STANDARD SYSTEMS
Single-stage gas, oil, electric
Single-stage heat pump
Multi-stage gas, oil, electric
Multi-stage heat pump
SETPOINT RANGE
50˚F to 99˚F (10˚C to 36˚C)
ACCESSORIES
Wallplate: F61-2663 (6.75” x 4.50”)
Thermostat guard: F29-0198
DIMENSIONS
5.88˝ W x 3.75˝ H x 1.00” D
SPECIFICATIONS
STORAGE
-20˚ to 150˚F (-29˚ to 65˚C)
0%-90% RH non-condensing
OPERATING AMBIENT
32˚F to +105˚F
(0˚C to +41˚C)
OPERATING HUMIDITY
90% non-condensing max
DISPLAY TEMPERATURE RANGE
32˚F to +99˚F (0˚C to 37˚C)
*The Sensi thermostat provides
automatic dual fuel control without an
outdoor sensor. A fossil fuel kit may be
added if user selectable balance point
settings are desired.
R-4552-6
The app changes color to
let you know at a glance
whether the system is
heating or cooling.
Model
Program
Options
Max Stages
Heat/Cool
Applications
Power
Source
Selectable Performance Features Comfort & Convenience Features
Model
Number
Wi-Fi Control/Smart
Home Qualifi ed
7 Day
Non-
Programmable
Conventional
Heat Pump
Gas/Oil/Electric
3 Wire Zone
Millivolt
PTAC Compatible
Battery
Hardwired (24V)
Auto Changover
Circulating Fan
EMR/ Early
Start Program
Temperature Limits
Humidity Display
Dual Fuel Control
Remote Sensor
Filter Change
Reminder
Auto DST Adjust
Keypad Lockout
Cont. backglow
w/ Common
Permanent Memory
1F87U-42WF
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