sensi 1F95U-42WF Series Touch Smart Thermostat User Guide

: October 30, 2023
: sensi

Table of Contents

sensi 1F95U-42WF Series Touch Smart Thermostat
Humidification & Dehumidification Wiring Diagrams
Wired Dehumidification
Frequently asked questions
Read User Manual Online (PDF format)
Download This Manual (PDF format)

sensi 1F95U-42WF Series Touch Smart Thermostat

Models: 1F95U-42WF series, ST75 series, NH-2WIFI series, OH-2WIFI series Version: April 2023

CONTRACTOR FIRMWARE UPDATE PROCESS
Connect the thermostat to Wi-Fi, and register to the customer’s account. After registration is complete, the thermostat will check for any available firmware updates available. You will see a drop down indicating a firmware update in progress if there is one. Make sure the firmware is updated before installing humidification accessories.

INSTALLATION – COMPATIBILITY AND WIRING

SENSI THERMOSTAT

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CONVENTIONAL SYSTEM CONNECTION

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HEAT PUMP SYSTEM CONNECTION

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RC†| Power for cooling, 24V
RH†| Power for heating, 24V
C| Common wire, 24V
Y| 1st 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)
G| 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)
L| No function| “L” terminal connection

Humidification & Dehumidification Wiring Diagrams

1°WIRE HUMIDIFICATION & DEHUMIDIFICATION

W2/* TERMINAL DEENERGIZES ON CALL FOR DEHUMIDIFICATION WITH CALL FOR COOL
Y2/* TERMINAL ENERGIZES ON CALL FOR HUMIDIFICATION WITH CALL FOR HEAT

sTech tip:
1 wire control is typically used to energize one side of a solenoid coil that already has the other side of a relay or solenoid coil attached to the common on the 24 VAC HVAC transformer.

Wired Dehumidification

Thermostat terminal W2/* de-energizes on call for dehumidification to lower the fan speed. The DHM/ DHUM terminal is only used on systems with a compatible dehumidification feature that have the required terminal connection on the control module or have a relay installed to lower fan speed.

Tech tip:
Wired dehumidification cannot be configured with two stage heating systems. If you’re unable to configure the thermostat for wired dehumidification, use the installer menu to make sure the HVAC Equipment for Indoor is set for single stage.

RELAY INSTALLED
A relay can be installed as shown below to switch fan speed to the next lower speed on a call for dehumidification from the thermostat. The reduction in air flow allows the coil to remove more humidity from the air. The relay should be rated for the blower motor load. Since this configuration reduces the air flow in cooling, the anti-freeze-up control or equivalent is recommended to prevent the air conditioning coil from freezing due to low air flow, dirty filters, low refrigerant pressure, etc.

CONFIGURATION – SETTING HUMIDIFICATION/DEHUMIDIFICATION CONTROL CAPABILITY ON/OFF

CONFIGURATION MENU ITEMS REFERENCE

10% – 100% (5% increments)

Humidify| Off 40%| Humidification Off/On 5%- 50% (5% increments)
Dehumidify| Off 50%| Dehumidification Off/On 40% – 95% (5% increments)

Press Advanced Set Up
Press Set Up HVAC Equipment
Make selections depending on the installed equipment
Press Add Additional Accessories, and press Yes for either a wired humidifier or a wired dehumidifier. Then press Save.

Note:
If you’re unable to toggle Yes then you are utilizing second-stage heating/cooling. Go back to the main HVAC Equipment menu and configure for single-stage heating/cooling.

USING THE FEATURE – TURNING HUMIDIFICATION CONTROL ON/OFF AND SETTING THE HUMIDITY SETPOINT
Adjust the humidification/dehumidification feature from either the thermostat or the Sensi app.

In the Advanced Set Up menu, the Humidify and Dehumidify feature controls are available. Humidification Press Humidifiy. In the Humidification menu, toggle the feature on or off. With Humidification on, adjust the set percentage to maintain using the up/down arrows. Press the back arrow button after you’re done. Wired Dehumidification Press Dehumidify. In the Dehumidification menu, toggle the feature on or off. With Dehumidification on, adjust the set percentage to maintain using the up/down arrows. Press the back arrow button after you’re done. Note: If you have selected wired dehumidification in the “HVAC Equipment” settings, then the overcooling option will not be there, only the wired dehumidifier option.

Dehumidification – Overcooling
If you don’t have an accessory installed for wired dehumidification, you can still use your cooling system to dehumidify your space. Press Dehumidifiy. In the Dehumidification menu, toggle the feature on or off. With Dehumidification on, adjust the set percentage to maintain using the up/down arrows. Press the back arrow button after you’re done.

Note:
This allows your cooling system to run longer, up to 3 degrees past your set temperature, to remove moisture.

Adjusting the humidity control 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 and adjust the percentage as needed or toggle the feature on/off.

Frequently asked questions

FAQ ANSWER

When can I get the firmware OTA update for humidity control?

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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?

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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?

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Use Y2/ for humidification and W2/ for dehumidification.

What types of humidifiers and dehumidifiers are supported?

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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?

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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?

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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?

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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.