EMERSON 1F87U-42WF Smart Thermostat Installation Guide

Table of Contents

Sensi™Smart Thermostat1F87U-42WF Installation Training

Sensi Smart Thermostat Best Value

Overview

Home comfort control – Anytime. Anywhere.
Intuitive app and hardware design validated by research and reviews
A traditional look that covers 90% of existing thermostat footprints
Extensive compatibility: heat, cool, heat pump, dual fuel
No c-wire is required in most cases (except HomeKit)

Features

Remote app control
Auto changeover
Large backlit display
Humidity control
Usage reports in-app for heating, cooling, and fan run time
Contractor branding on device and in-app
Popular smart home platform integrations – Amazon Alexa, Google Assistant, Apple HomeKit, SmartThings and Wink
Geofencing smart feature and flexible scheduling options for energy savings
Multi thermostat control capable for light commercial applications

Sensi Smart Thermostat Comparison

THERMOSTAT FEATURE
MSRP	$169	$129
Aesthetics	Modern / Simple / Sleek	Traditional /Approachable
Interface	Capacitive Touchscreen	Buttons
System Type	Universal 4H/2C	Universal 4H/2C
Contractor branding	App-only	Device & App
C-Wire Required	Yes	No
Humidity Control
Dual Fuel
Smart Feature – Geofencing
Keypad Lockout

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 4

SYSTEM TYPE	COMPATIBILITY	MODIFICATIONS
Conventional heating and cooling• Gas furnace• Air conditioner• Electric furnace• Boiler	Yes	None
Heat only• Gas furnace• Electric furnace• Boiler	Yes	Requires a common wire (c-wire)
Cool only• Air conditioner	Yes	Requires a common wire (c-wire)
Heat pump	Yes	Requires a common wire (c-wire)
Communicating proprietary	systems	No Needs for standard HVAC wiring
Line voltage	No	Requires low voltage (20-30VAC)
Millivolt systems	No	Requires 20-30VAC

Terminal outputs

OLD THERMOSTAT	SENSI THERMOSTAT	CONVENTIONAL SYSTEM	HEAT PUMP SYSTEM
RH	RH’	Power for heating, 24V
RC, R	RC’	Power for cooling, 24V
C, X, B	** C	Common wire, 24V
Y, Y1	Y	1st stage cool	1st outdoor stage heat
Y2	Y2/*	2nd stage cool or humidifier	2nd indoor stage 2nd stage auxiliary/ emergency heat or dehumidifier
W, Wl, Aux/E, E	W/E,	1st indoor stage heat	1st stage auxiliary/ emergency heat
W2	W2/*	2nd outdoor stage heat and cool or humidifier	2nd indoor stage 2nd stage auxiliary/ emergency heat or dehumidifier
G	G	Indoor blower (fan)
L	L	no function	“L” terminal connection

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.|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.

Look for an unused wire in the thermostat cable bundle- Video: Using an extra, unused wire as a common wire
Use the “G” (Fan wire) Video: Using a g-wire (fan wire) as a common wire
Install an Emerson Thermostat Common Wire Kit Video: Using an Emerson Thermostat Common Wire Kit

Do I need an RC/RH jumper?

No jumpers required

Sensi 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 faceplate.

RC/RH jumper location

Sensi Thermostat has a jumper built-in on the back of the thermostat

No jumpers are required when installing the Sensi Smart ThermostatHeat pump jumper wires

Some thermostats will have additional jumpers installed
Remove the jumper and label as shown below

JUMPER WIRE LABELING
Old thermostat jumper terminals	Label wire from wall
Y	W	Y
Y2	W2	Y2
W2	E	W/E

Wiring – two transformer – conventional single-stage or two-stage systems

A quick tip: Thermostat wiring does not follow a standardized color code.Take a picture with your smartphone and label thermostat wires before removing the old thermostat from the wall.Wiring – heat pumps single-stage or multi-stage systems

A quick tip: Thermostat wiring does not follow a standardized color code.Take a picture with your smartphone and label thermostat wires before removing the old thermostat from the wall.

Heat pump wiring exceptions

Separate W2 and E Wires

Both wires will be labeled W/E and attached to the same terminal.

HEAT PUMPS WITH SEPARATE WIRES ON W2 AND E
Old thermostat	Label wire from wall
W2	Separate wire	W/E	Both wires will be attached to the W/E terminal
E	Separate wire	W/E

B Terminal Wires

“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

B TERMINAL LABELING
Old thermostat	Label wire from wall
B	Wire on “O” terminal	C
B	No wire on “O” terminal	O/B

Terminal outputs

OLD THERMOSTAT	SENSI THERMOSTAT	CONVENTIONAL SYSTEM	HEAT PUMP SYSTEM
RH	RH’	Power for heating, 24V
RC, R	RC’	Power for cooling, 24V
C, X, B**	** C	Common wire, 24V
Y, Y1	Y	1st stage cool	1st outdoor stage heat
Y2	Y2/*	2nd stage cool or humidifier	2nd indoor stage 2nd stage auxiliary/ emergency heat or dehumidifier
W, Wl, Aux/E, E	W/E,	1st indoor stage heat	1st stage auxiliary/ emergency heat
W2111	W2/*	2nd outdoor stage heat and cool or humidifier	2nd indoor stage 2nd stage auxiliary/ emergency heat or dehumidifier
G	G	Indoor blower (fan)
0,B,” 0/8	0/B	Changeover (reversing valve) connection for heat pump or zone panel systems
L	L	no function	“L” terminal connection

Note that Y2/* and W2/* are being used for wired humidification or dehumidification, respectively

System configuration

CONFIGURATION MENU ITEMS REFERENCE
Display Code	Menu item	Default	Options
Wireless SetupConnects Thermostat to Wi-Fi network	–	Connect
Fahrenheit or Celsius	F	FC
Outdoor Equipment ConfigurationCooling or heat pumps	AC2	AC1 – Conventional Cooling 1 (Single Stage) AC2- Conventional Cooling 2 (Two-Stage) HP1- Heat Pump 1 (Single Stage) HP2- Heat Pump 2 (Two-Stage) ACO- No Cooling
Indoor Equipment Configurationfor Gas or Electric heat	EL2	ELF1 Electric 1 (Single Stage) EL2- Electric 2 (Two-Stage) FAn GA1 Gas 1 (Single Stage) GA2 Gas 2 (Two-Stage)
Reversing Valve Position O Selects “0” or ‘Er Setting For Heat Pumps Only	0	OB2
Fn	Circulating Fan	OFF	Off/10% – 100% (5% increments)
H AA	HumidificationAdd Accessory	OFF	Off/On
H SP	HumidificationSetPoint	OFF	Off/5% – 50% (5% increments)
DH AA	DehumidificationAdd Accessory	Od	Od/OcOd – Optimal dehumidification (overcool to dehumidify)Oc – Optimal comfort (Wired dehumidification)
DH SP	DehumidificationSetPoint	OFF	Off/40% – 95% (5% increments)
Wireless RadioON Turns Wi-Fi Radio On/Off	ON	On/Off

System Compatibility List – Humidity Control

Heat only: Humidifier only
Cool only: Dehumidifier only
1 stage heat, 1 stage cool: Humidifier and Dehumidify
1 stage heat, 2 stages cool: Dehumidifier only*
2 stage heat, 1 stage cool: Humidifier only*
2 stage heat, 2 stages cool: None*

* Note: if the staging on a 2 stage heat or 2 stages cool system can be handled by the furnace/air handler board, that will open up the Y2 or W2 terminal for hum/dehum use.

How to Set Up Humidity Control on the Sensi Thermostat Installation

Install humidifier/dehumidifier equipment– Wire the whole-house humidifier to the Y2/* terminal– Wire the whole-house or standalone dehumidifier to the W2/* terminal
New menu items H AA and DH AA (Additional Accessory)– For wired dehumidification, select OC (Optimal Comfort)– For dehumidification through overcooling, select Od (Optimal Dehumidification)
Depending on installed equipment, select the appropriate configuration

Connecting to Wi-Fi is simple

Connect with your customers – Anytime. Anywhere.

Register your company at www.SensiRegistration.com– Upload your logo which will be displayed on your customer’s phone
During installation, enter your registered phone number in the Sensi app– The Sensi app stores your contact information in your customer’s phone.
When your customer needs service, you’re just a tap away.– Also, if your customer receives a smart alert due to a system issue, your contact information will be included

Grow your business with a light commercial solution from Sensi

Sensi Multiple Thermostat Manager offers a simple, affordable solution for property-wide comfort control, connected in one place.Learn more and take a FREE test drive at sensi.emerson.com/mtmTotal Comfort ControlMonitor multiple commercial thermostats from anywhere through the intuitive portal featuring dragand-drop functionality.|Keypad Lockout & Temperature LimitsMaintain total control of your thermostat settings by setting temperature limits or disabling changes made outside of the online control portal.Group Scheduling MonitorEasily consolidate and customize settings across multiple thermostats by grouping and sorting.Energy Saving FeaturesRemote control and flexible batch scheduling can minimize energy waste and help you save money.Extensive Compatibility*Works with HVAC systems in most facilities. All you need are our highly-rated Sensi Smart Thermostats.Smart AlertsEnable optional notifications that let you know when and where extreme temperature or humidity changes are detected in your building(s).