EMERSON 1F87U-42WF Smart Thermostat Installation Guide

: June 7, 2024
: Emerson

Table of Contents

Overview
Features
Sensi Smart Thermostat Comparison
Compatibility and common wire (c-wire) requirement
Terminal outputs
**Heat pump wiring exceptions
Terminal outputs
System configuration
System Compatibility List – Humidity Control
How to Set Up Humidity Control on the Sensi Thermostat
Connecting to Wi-Fi is simple
Connect with your customers – Anytime. Anywhere.
Grow your business with a light commercial solution from Sensi
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

EMERSON 1F87U-42WF Smart Thermostat

Sensi™
Smart Thermostat
1F87U-42WF Installation Training

Sensi Smart Thermostat Best Value

EMERSON 1F87U-42WF Smart Thermostat - fig1

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 Thermostat
Heat 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

EMERSON 1F87U-42WF Smart Thermostat - fig7

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

EMERSON 1F87U-42WF Smart Thermostat - fig8

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

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

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

EMERSON 1F87U-42WF Smart Thermostat - fig10 |
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Connect with your customers – Anytime. Anywhere.

EMERSON 1F87U-42WF Smart Thermostat - fig19

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

EMERSON 1F87U-42WF Smart Thermostat - fig20

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/mtm
Total Comfort Control
Monitor multiple commercial thermostats from anywhere through the intuitive portal featuring dragand-drop functionality.|
Keypad Lockout & Temperature Limits
Maintain total control of your thermostat settings by setting temperature limits or disabling changes made outside of the online control portal.
Group Scheduling Monitor
Easily consolidate and customize settings across multiple thermostats by grouping and sorting.
Energy Saving Features
Remote 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 Alerts
** Enable optional notifications that let you know when and where extreme temperature or humidity changes are detected in your building(s).