Emerson Sensi Gebrauchs- und Wartungshandbuch

SENSI™SMART THERMOSTAT

Humidity control guide

Models: 1F87U-42WF, ST55, NH-AWIFI, OH-AWIFI

R-5622

Sensi smart thermostat | HUMIDITY GUIDE 2

1. CONTRACTOR FIRMWARE UPDATE PROCESS

Connect the thermostat to Wi-Fi, register to the customer's account to make

sure the thermostat has the latest ﬁrmware release.

2. INSTALLATION – COMPATIBILITY AND WIRING

SENSI THERMOSTAT CONVENTIONAL SYSTEM CONNECTION HEAT PUMP SYSTEM CONNECTION

RC†Power for cooling, 24V Power for cooling, 24V

RH†Power for heating, 24V Power for heating, 24V

CCommon wire, 24V Common wire, 24V

Y1st stage cool 1st stage heat and cool (compressor)

Y2/* 2nd stage cool

(or humidiﬁer) 2nd stage heat and cool (or humidiﬁer)

W/E 1st stage heat 1st stage auxiliary/emergency

heat (2nd stage heat)

W2/* 2nd stage heat

(or dehumidiﬁer) 2nd stage auxiliary/emergency heat

(3rd stage heat or dehumidiﬁer)

GIndoor blower (fan) Indoor blower (fan)

O/B

Heat pump changeover, zone panel

or 3-wire hot water zone valve

connection. (conﬁgurable as O, B

or 2 in the installer menu)

Heat pump changeover (reversing

valve) connection (conﬁgure as

O or B in the installer menu)

Lno function “L” terminal connection

Sensi smart thermostat | HUMIDITY GUIDE 3

W2/* TERMINAL DE-ENERGIZES ON CALL

FOR DEHUMIDIFICATION WITH CALL FOR COOL

Y2/* TERMINAL ENERGIZES ON CALL

FOR HUMIDIFICATION WITH CALL FOR HEAT

HUMIDIFIER

Valve 24V

O/B

W/E

Y2/*

W2/*

FURNACE/AIR HANDLER

TERMINAL STRIP

THERMOSTAT

SYSTEM

TRANSFORMER

LINE VOLTAGE

COMMON

HOT

DHUM

1-WIRE HUMIDIFICATION & DEHUMIDIFICATION

DEHUMIDIFICATION WITH RELAY INSTALLED

FURNACE/AIR HANDLER

TERMINAL STRIP DHM

THERMOSTAT

RELAY

90-293Q

OR EQUIVALENT

NORMAL HIGH

MED

DEHUM

SPEED FAN

LOW

HEAT FAN OUTPUT

COOL FAN OUTPUT

1. NORMAL COOL SPEED POSITION (DHM ENERGIZED)

2. DEHUM SPEED MODE (DHM DE-ENERGIZED)

Sensi smart thermostat | HUMIDITY GUIDE 4

3. CONFIGURATION – SETTING HUMIDIFICATION/DEHUMIDIFICATION CONTROL CAPABILITY ON/OFF

CONFIGURATION MENU ITEMS REFERENCE

Display

Code Menu item Default Options

Wireless setup

Connects thermostat to wi-ﬁ network — Connect

Fahrenheit or celsius F F

Outdoor equipment conﬁguration

Cooling 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)

AC0 – No cooling

Indoor equipment conﬁguration

For gas or electric heat EL2

EL1– Electric 1 (single-stage)

EL2– Electric 2 (two-stage)

FAn

GA1 – Gas 1 (single-stage)

GA2 – Gas 2 (two-stage)

Reversing valve position

Selects “O” or “B” setting

For heat pumps only

Fn Circulating fan OFF Off/10% – 100% (5% increments)

H AA Humidiﬁcation

Add accessory OFF Off/On

H SP Humidiﬁcation

Set point OFF Off/5% – 50% (5% increments)

dH AA Dehumidiﬁcation

Add accessory Od

Od/Oc

Od – Optimal dehumidiﬁcation

(overcool to dehumidify)

Oc – Optimal comfort (wired dehumidiﬁcation)

dH SP Dehumidiﬁcation

Set point OFF Off/40% – 95% (5% increments)

Wireless radio

Turns wi-ﬁ radio on/off ON Off/On

Sensi smart thermostat | HUMIDITY GUIDE 5

HUMIDIFICATION CONTROL AT THE THERMOSTAT

Ensure HVAC settings are single stage

To set up a wired humidiﬁer accessory on this model, you will need to ensure that you have conﬁgured the HVAC

settings for single stage ﬁrst. (Single stage cooling to use a humidiﬁer or single stage heating to use a dehumidiﬁer.)

If you have the thermostat conﬁgured for multi-stage, the humidity control options won't be in the menu.

Setting up wired humidiﬁcation

With the thermostat showing the room

temperature, press Menu.

Press Next 7 times.

Use the Up Arrow button to toggle Humidity On.

Press Next.

Use the Up Arrow button to change the set percentage

(SP) to your desired percentage to maintain.

Press Exit.

Setting up wired dehumidiﬁcation

With the thermostat showing the room

temperature, press Menu.

Press Next 8 times. - This may be different depending on

what other settings you have. Look for the "dH AA" menu.

Use the Up Arrow button to toggle Dehumidity "On."

Press Next.

Use the Up Arrow button to change the set percentage

(SP) to your desired percentage to maintain.

Press Exit.

Sensi smart thermostat | HUMIDITY GUIDE 6

HUMIDIFICATION CONTROL IN THE SENSI APP

Adjusting the humidity features from the Sensi app

After initially turning the feature on in the thermostat menu, you can edit them from the Sensi app.

Open the Sensi app.

Tap your Thermostat Name.

Tap the Settings Gear.

Tap System Settings.

Scroll to the Humidity Control section.

You can toggle the humidiﬁcation features on/off

here, as well as adjust the set percentage.

*If you don't have wired dehumidiﬁcation conﬁgured,

you will have a different dehumidiﬁcation

option here that you can utilize. It will use your

cooling system to remove moisture from the air

by overcooling your space up to 3 degrees.

Sensi smart thermostat | HUMIDITY GUIDE 7

Frequently asked questions

FAQ ANSWER

When can I get the ﬁrmware OTA

update for humidity control? OTA updates are pushed via Wi-Fi after being

registered to the customer's account on the Sensi app.

Which versions of Sensi thermostats are

compatible with humidity control?

Sensi Touch (1F95U) and Sensi (1F87U) smart

thermostats are all backward compatible. 1F86U

and UP500W models are currently not compatible.

What terminals should I use to

enable humidity control? Use Y2/* for humidiﬁcation and

W2/* for dehumidiﬁcation.

What types of humidiﬁers and

dehumidiﬁers are supported?

Humidiﬁers: Any 24VAC humidiﬁer. Currently,

Sensi does not support independent

(call for heat) humidiﬁcation.

Dehumidiﬁers: HVAC systems with dehumidify

mode (slowing of the system's fan speed) or 24VAC

dehumidiﬁers. Currently Sensi does not support

independent (call for cool) dehumidiﬁcation.

What is an appropriate humidity setpoint?

Depending on the outdoor temperature, the

ideal indoor humidity level is between 30-50%

RH. In cold weather, if condensation appears on

your windows, lower the humidity setpoint.

What is overcooling to dehumidify?

On air conditioning systems without a

dehumidiﬁer, the dehumidiﬁcation feature allows

Sensi to overcool to a maximum of 3⁰ below

the AC setpoint to help control the humidity.

Overcooling is an option to dehumidify without

having to wire additional accessories.

Why is my system unable to reach

my humidity setpoint?

During extremely cold and dry or hot and

humid climates, your humidiﬁer or dehumidiﬁer

may not be able to increase or decrease

humidity enough to reach your setpoint

depending on the size of your equipment.

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