2ATM74004Thermostat 2

72 °F SEN1 78 °F SEN2 LOCAL YS4004-UC YoLink Thermostat 2 Installation & User Guide Revision Apr. 29, 2024 . Welcome . Before You Begin . In the Box . Required Items . Get to Know Your Thermostat 2 . Install the App . Add Your Thermostat 2 to the App . Installation . Operations: Set the Cool/Heat . Operations: Navigating the Menu System . Operations: Schedules: Editing & Copying . Operations: Y & Aux Config . Operations: Date & Time . Operations: Temperature Settings . Operations: Display & Sound . Operations: Factory Reset . App Functions: Device Screen . App Functions: Device Details Screen . App Functions: Schedule . App Functions: ECO settings . App Functions: Smart - Scene . App Functions: Smart – Automation . App & 3rd-Party Services . Factory Reset . Firmware Update . Specifications . Troubleshooting . Warnings . Warranty . FCC Statement . Contact Us A B C D E F G H I J K L M N O P Q R S T U V W X Y Z AA AB AC AD AE 01 02 04 05 06 07 08 10 16 17 18 21 22 24 26 27 29 31 33 34 35 36 37 38 39 40 42 45 47 48 50 Contents 01 Welcome! Thank you for purchasing YoLink products! We appreciate you trusting YoLink for your smart home & automation needs. Your 100% satisfaction is our goal. If you experience any problems with your installation, with our products or if you have any questions that this manual does not answer, please contact us right away. See the Contact Us section for more info. Thank you! YoLink Customer Support A User Guide Conventions The following icons are used in this guide to convey specific types of information: Very important information (can save you time!) Good to know info but may not apply to you 02 Before You Begin B Download the most current version of the user guide by scanning the QR code: Visit our YoLink Thermostat 2 support page on our website, for the latest installation guides, additional resources, information and videos by visiting: https://www.yosmart.com/support/YS4004-UC Or by scanning the QR code: 03 Before You Begin, Continued B Before you begin installation, please note, the Thermostat requires a C (Common) wire. It will not function without a C wire. If the thermostat location does not have a C wire, a new C wire, or a C wire adapter, must be installed. Please contact us for additional information and technical support on this topic. This thermostat works with common 2-stage 24 volt AC systems such as forced air, hydronic, heat pump, oil, gas, and electric. It will not work with millivolt systems, such as a gas fireplace, or with 120/240 volt systems such as baseboard electric heat. Your Thermostat connects to the internet via a YoLink hub, and it does not connect directly to your WiFi or local network. In order for remote access to the device from the app, and for full functionality, a hub is required. This guide assumes the YoLink app has been installed on your smartphone, and a YoLink hub is installed and online (or your location, apartment, condo, etcetera, is already served by a YoLink wireless network). 04 In the Box C Thermostat 2Mounting Plate (“Back Plate") Quick Start Guide Wire Labels Wall Screws (4) & Drywall Anchors (4) & xxxxxx xxxxxx xxxxxx xxxxxx xxxxxx xxxxxx xxxxxx xxxxxx 05 Required Items D The following items may be required: Drill with Drill BitsMultimeter Medium Phillips ScrewdriverSmall Slotted Screwdriver Level Alternative Mounting Hardware Pencil 06 72 °F SEN1 78 °F SEN2 LOCAL Get to Know Your YoLink Thermostat 2 E Please take a moment to familiarize yourself with your new Thermostat. 20 21 22 23 191817161514 123456 13 12 11 10 9 8 7 1) Current day of the week 2) Current time of day 3) Current Date 4) Master Sensor Temperature (Local) 5) Fahrenheit/Celsius indicator 6) Connection status (white if connected, red if disconnected) 7) ECO (Energy Conservation Operation) Leaf appears if in ECO mode 8) Cooling set point 9) Temperature up button 10) Status (“Cooling" if in cooling mode, “Heating" if in heating mode) 11) Temperature down button 12) Heating set point 13) Schedule status (“RUN" if running on a schedule, “HOLD" if not running on a schedule) 14) Schedule button (press to activate or deactivate schedules) 15) Fan status (“AUTO" if fan will run on demand, “ON" if the fan is on) 16) Fan button (press to switch the fan between AUTO and ON mode) 17) Mode button (press to switch between system modes: AUTO, HEAT, COOL, OFF) 18) Mode status (“AUTO" if cooling or heating automatically, “HEAT" if only heating is running, “COOL" if only cooling is running) 19) Menu button (press to access the Thermostat's menu system) 20) Menu indicator 22) Current humidity level (%) 22) Guest Sensor 1 Temperature (SEN1) 23) Guest Sensor 2 Temperature (SEN2) 07 Install the App F Open the app and tap Sign up for an account. You will be required to provide a username and a password. Follow the instructions, to set up a new account. Allow notifications, when prompted. You will immediately receive a welcome email from [email protected] with some helpful information. Please mark the yosmart.com domain as safe, to ensure you receive important messages in the future. Log in to the app using your new username and password. The app opens to the Favorite screen. This is where your favorite devices and scenes will be shown. You can organize your devices by room, in the Rooms screen, later. If you are new to YoLink, please install the app on your phone or tablet, if you have not already. Otherwise, please proceed to the next section. Scan the appropriate QR code below or find the “YoLink app” on the appropriate app store. Apple phone/tablet iOS 9.0 or higher Android phone/tablet 6.0 or higher 08 Add Your Thermostat to the App G 1. Tap Add Device (if shown) or tap the scanner icon: Scanner icon 2. Approve access to your phone’s camera, if requested. A viewfinder will be shown on the app. 3. Hold the phone over the QR code so that the code appears in the viewfinder. If successful, the Add Device screen will be displayed. 09 Add Your Thermostat to the App, C…

Text truncated - open the document above for the full version.

YoSmart Inc. YoSmart Inc. U.S. Agent Designation for Service of Process (Applicant and U.S. Agent are Separate Parties) TO: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046, USA ATTENTION: FCC Certification – Section 2.911(d)(7) Information Designated U.S. Agent Company Name: YoSmart Inc. FRN: 0028563856 Contact Name: Manxiang Xu Address: 25172 Arctic Ocean Drive, Suite 106, Lake Forest, California, United States 92630 Telephone No: 9498255958 Email: [email protected] This letter is to confirm that we (“the Designated U.S. Agent) have accepted the responsibility to act as the Designated U.S. Agent for Service of Process as required by section 47 CFR 2.911(d)(7) on behalf of the Applicant noted below. U.S. Agent Signature: Date: Signed by (Printed Name/Title): The Applicant acknowledges that they must maintain an agent for no less than one year after terminating all marketing and importation OR the conclusion of any Commission-related proceeding involving the equipment. The applicant further acknowledges their responsibility to inform the FCC whenever the Designated U.S. Agent information above changes. Applicant Company name: YoSmart Inc. Grantee Code: 2ATM7 FCC ID: 2ATM74004 FRN: 0028563856 Contact Name: Manxiang Xu Address: 25172 Arctic Ocean Drive, Suite 106, Lake Forest, California, United States 92630 Telephone No: 9498255958 Email: [email protected] Applicant Signature: Date: 2024.06.25 Signed by (Printed Name/Title): Manxiang Xu / Manager

YoSmart Inc. 2024.06.25 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for FCC ID: 2ATM74004 [YoSmart Inc.] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Sincerely, (Applicant signature) (Applicant printed name) Manxiang Xu YoSmart Inc. 2024.06.25 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for FCC ID: 2ATM74004 [YoSmart Inc.] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Sincerely, (Applicant signature) (Applicant printed name) Manxiang Xu

YoSmart Inc. 2024.06.25 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR EUT NAME: Thermostat 2 Trademark: N/A MODEL : YS4004-UC YS4004-UA FCC ID : 2ATM74004 To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the - Block Diagram - Schematics - Operational Description required to be submitted with this application be permanently withheld from public review. The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. Please contact me if there is any information you may need. Sincerely, Client’s signature: Client’s name / title : Manxiang Xu /Manager Contact information / address: 25172 Arctic Ocean Drive, Suite 106, Lake Forest, California, United States 92630

YoSmart Inc. 2024.06.25 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Shenzhen BCTC Testing Co., Ltd to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Client’s signature: Client’s name / title : Manxiang Xu /Manager Contact information / address: 15375 Barranca Parkway, Ste G-105 Irvine, CA 92618, USA

YoSmart Inc. Model Difference Product description: Thermostat 2 Model name: YS4004-UC, YS4004-UA Trade Name: N/A FCC ID: 2ATM74004 All the model are the same circuit and RF module, except model names. Regards Sincerely Client’s signature: Client’s name / title : Manxiang Xu/N/A Contact information / address: 25172 Arctic Ocean Drive, Suite 106, Lake Forest, California, United States 92630

External Photos

Label & label location 3 20mm*10mm FCC ID:2ATM74004 Label location

Internal Photos Antenna

FCC §15.247 (i), §2.1091 – RF Exposure FCC ID:2ATM74004 Applied procedures / limit According to FCC §15.247(i) and §1.1307(b)(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. Limits for Occupational / Controlled Exposure Frequency Range (MHz) Electric Field Strength (E) (V/m) Magnetic Field Strength (H) (A/m) Power Density (S) (mW/ cm 2 ) Averaging Time |E| 2 ,|H| 2 or S (minutes) 0.3-3.0 614 1.63 (100)* 6 3.0-30 1842 / f 4.89 / f (900 / f)* 6 30-300 61.4 0.163 1.0 6 300-1500 F/300 6 1500-100,000 5 6 Note: ƒ is frequency in MHz * = Power density limit is applicable at frequencies greater than 100 MHz Limits for General Population / Uncontrolled Exposure Frequency Range (MHz) Electric Field Strength (E) (V/m) Magnetic Field Strength (H) (A/m) Power Density (S) (mW/ cm 2 ) Averaging Time |E| 2 ,|H| 2 or S (minutes) 0.3-1.34 614 1.63 (100)* 30 1.34-30 824/f 2.19/f (180/f)* 30 30-300 27.5 0.073 0.2 30 300-1500 F/1500 30 1500-100,000 1.0 30 Note: f = frequency in MHz * = Plane-wave equivalent power density MPE PREDICTION Predication of MPE limit at a given distance, Equation from OET Bulletin 65, Edition 97-01 Where: S = power density P = power input to antenna G = power gain of the antenna in the direction of interest relative to an isotropic radiator R = distance to the center of radiation of the antenna, R=0.2m TEST RESULTS LoRa:102.82dBuV/m Below 1GHz: dBm=dBuV/m-95.2-4.7 Conclusion: For the max result : 0.00337≤ 0.61, compliance with FCC's RF Exposure Tune up Produce power Maximu m peak output power (dBm) Output power to antenn a (mW) Antenna Gain (numeric) Power Density (S) (mW/ cm2) Limit (mW / cm2 ) Result LoRa 3±1 4 2.51 0.675 (-1.71dBi) 0.00337 0.61 Pass

Shenzhen HX Antenna Co., LTD T e l ： 0755-23205219 W e b ： http://www.hxrf-antenna.com/ Address ： West Floor 2, Building C10, Xin 'an Second Industrial Zone, Gushu Second Road, Xixiang Baoan District, Shenzhen China. Contents 1 ： Antenna Overview &Dimension 2 ： The test project 1. Antenna Matching Network 2. Gain & Efficiency3. The Free Space 3D Data Shenzhen HX Antenna Co., LTD T e l ： 0755-23205219 W e b ： http://www.hxrf-antenna.com/ Address ： West Floor 2, Building C10, Xin 'an Second Industrial Zone, Gushu Second Road, Xixiang Baoan District, Shenzhen China. Antenna Overview & Dimension unitu unit:mm Shenzhen HX Antenna Co., LTD T e l ： 0755-23205219 W e b ： http://www.hxrf-antenna.com/ Address ： West Floor 2, Building C10, Xin 'an Second Industrial Zone, Gushu Second Road, Xixiang Baoan District, Shenzhen China. 2.7PF 10nH 2.7PF 10nH Shenzhen HX Antenna Co., LTD T e l ： 0755-23205219 W e b ： http://www.hxrf-antenna.com/ Address ： West Floor 2, Building C10, Xin 'an Second Industrial Zone, Gushu Second Road, Xixiang Baoan District, Shenzhen China. 915 Aatenna Gain&Efficiency Frequency ID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Frequency (MHz) 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0Efficiency (dBi) -9.06 -8.88 -8.73 -8.49 -8.20 -7.91 -7.62 -7.28 -6.97 -6.71 -6.50 -6.32 -6.16 -6.03 -5.95 Gain (dBi) -4.97 -4.74 -4.63 -4.58 -4.44 -4.34 -4.11 -3.88 -3.66 -3.60 -3.64 -3.43 -3.16 -2.88 -2.66 Efficiency (%) 12.41 12.93 13.41 14.16 15.12 16.17 17.30 18.69 20.07 21.32 22.39 23.32 24.20 24.95 25.40 Frequency ID 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Frequency (MHz) 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0Efficiency (dBi) -5.87 -5.79 -5.74 -5.65 -5.48 -5.33 -5.20 -5.07 -4.93 -4.79 -4.67 -4.62 -4.54 -4.43 -4.37 Gain (dBi) -2.48 -2.28 -2.20 -2.14 -1.95 -1.85 -1.80 -1.71 -1.63 -1.51 -1.43 -1.33 -1.22 -1.03 -0.89 Efficiency (%) 25.86 26.39 26.65 27.22 28.31 29.33 30.20 31.13 32.14 33.20 34.10 34.48 35.17 36.10 36.55 Frequency ID 31 32 33 34 35 36 37 Frequency (MHz) 950.0 955.0 960.0 965.0 970.0 975.0 980.0Efficiency (dBi) -4.40 -4.41 -4.39 -4.40 -4.45 -4.50 -4.50 Gain (dBi) -0.81 -0.72 -0.58 -0.52 -0.46 -0.48 -0.48 Efficiency (%) 36.34 36.23 36.36 36.28 35.89 35.46 35.45 Shenzhen HX Antenna Co., LTD T e l ： 0755-23205219 W e b ： http://www.hxrf-antenna.com/ Address ： West Floor 2, Building C10, Xin 'an Second Industrial Zone, Gushu Second Road, Xixiang Baoan District, Shenzhen China. Free Space 3D Active data Shenzhen HX Antenna Co., LTD T e l ： 0755-23205219 W e b ： http://www.hxrf-antenna.com/ Address ： West Floor 2, Building C10, Xin 'an Second Industrial Zone, Gushu Second Road, Xixiang Baoan District, Shenzhen China. Free Space 3D Active data Shenzhen HX Antenna Co., LTD T e l ： 0755-23205219 W e b ： http://www.hxrf-antenna.com/ Address ： West Floor 2, Building C10, Xin 'an Second Industrial Zone, Gushu Second Road, Xixiang Baoan District, Shenzhen China. Free Space 3D Active data Shenzhen HX Antenna Co., LTD T e l ： 0755-23205219 W e b ： http://www.hxrf-antenna.com/ Address ： West Floor 2, Building C10, Xin 'an Second Industrial Zone, Gushu Second Road, Xixiang Baoan District, Shenzhen China. THANKS

No.：BCTC/RF-EMC-005 Page 1 of 34 Edition：B.2 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2405246930E Applicant: YoSmart Inc. Product Name: Thermostat 2 Test Model: YS4004-UC Tested Date: 2024-05-16 to 2024-06-06 Issued Date: 2024-06-06 Report No.: BCTC2405246930E No.：BCTC/RF-EMC-005 Page 2 of 34 Edition：B.2 FCC ID:2ATM74004 The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen BCTC Testing Co., Ltd, this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. Product Name: Thermostat 2 Trademark: N/A Model/Type reference: YS4004-UC YS4004-UA Prepared For: YoSmart Inc. Address: 25172 Arctic Ocean Drive, Suite 106, Lake Forest, California, United States 92630 Manufacturer: YoSmart Inc. Address: 25172 Arctic Ocean Drive, Suite 106, Lake Forest, California, United States 92630 Prepared By: Shenzhen BCTC Testing Co., Ltd. Address: 1-2/F., Building B, Pengzhou Industrial Park, No.158, Fuyuan 1st Road, Zhancheng, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: 2024-05-15 Sample tested Date: 2024-05-16 to 2024-06-06 Issue Date: 2024-06-06 Report No.: BCTC2405246930E Test Standards: FCC Part15.249 ANSI C63.10-2013 Test Results: PASS Tested by: Approved by: Tang Changyu/ Project Handler Zero Zhou/Reviewer Report No.: BCTC2405246930E No.：BCTC/RF-EMC-005 Page 3 of 34 Edition：B.2 Table Of Content Test Report Declaration Page 1. Version .................................................................................................................. 4 2. Test Summary ....................................................................................................... 5 3. Measurement Uncertainty ..................................................................................... 6 4. Product Information And Test Setup ..................................................................... 7 4.1 Product Information ............................................................................................... 7 4.2 Test Setup Configuration ...................................................................................... 7 4.3 Support Equipment ............................................................................................... 8 4.4 Channel List .......................................................................................................... 8 4.5 Test Mode ............................................................................................................. 8 5. Test Facility And Test Instrument Used .................................................................. 9 5.1 Test Facility ........................................................................................................... 9 5.2 Test Instrument Used ............................................................................................ 9 6. Conducted Emissions ........................................................................................... 11 6.1 Block Diagram Of Test Setup .............................................................................. 11 6.2 Limit .................................................................................................................... 11 6.3 Test Procedure ................................................................................................... 11 6.4 EUT Operating Conditions .................................................................................. 11 6.5 Test Result .......................................................................................................... 12 7. Radiated Emissions ............................................................................................. 14 7.1 Block Diagram Of Test Setup .............................................................................. 14 7.2 Limit .................................................................................................................... 15 7.3 Test Procedure ................................................................................................... 16 7.4 EUT Operating Conditions .................................................................................. 17 7.5 Test Result .......................................................................................................... 18 7.6 Field Strength Calculation ................................................................................... 22 8. 100 KHz Bandwidth Of Frequency Band Edge.................................................... 23 8.1 Block Diagram Of Test Setup .............................................................................. 23 8.2 Applicable Standard ............................................................................................ 23 8.3 Test Procedure ................................................................................................... 23 8.4 EUT Operating Conditions .................................................................................. 23 8.5 Test Result .......................................................................................................... 24 9. 20 Db Bandwidth ................................................................................................. 26 9.1 Block Diagram Of Test Setup .............................................................................. 26 9.2 Limit .................................................................................................................... 26 9.3 Test Procedure ................................................................................................... 26 9.4 EUT Operation Conditions .................................................................................. 26 10. Calculation of Average Factor ........................................................................…

Text truncated - open the document above for the full version.

16. EUT Test Setup Photographs Conducted Measurement Photo Radiated Measurement Photos