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INSTALLATION INSTRUCTIONS & USER'S MANUAL
SYMPHONY CHOIR CEILING CASSETTE INDOOR UNIT
For Model Numbers:
WMMS-12EC-V2B(59)2
WMMS -18EC-V2B(59)2
WMMS -24EC-V2B(59)2
Thank you for choosing this YMGI product. Please read the user's manual carefully before installation/operation and retain for your records
and future reference. If you need a replacement copy, please contact your local agent or visit www.ymgigroup.com to download a current
electronic version.
This product is designed and manufactured to be free from any defects in material and workmanship during normal use and
maintenance. Installation, operation, maintenance and repair must follow all standards and professional practices for regular cooling
and heating equipment, such as NEC, State, or Local Codes and all related documents/manuals provided by YMGI. Failure to follow
and adhere to all codes and documentation can cause damage to equipment, property even personal injury.
Installer: Currently licensed/certified HVAC technicians only. Must Read the manual and all provided documents prior to installation.
Complete and fill out all required information on the warranty registration card.
User: Retain this manual and all supplied documents for your records and future reference.
Servicer: Use this manual for information concerning servicing and maintenance of this product.
Only qualified technicians should install and service this equipment. The installation, startup, operation and servicing of this equipment
can be hazardous and requires a HVAC professional who has been trained, licensed and certified. Installations, adjustments or any
equipment alterations done by an unqualified person could result in serious injury and even death. When working on the equipment,
observe all precautions in the provided documents, on the tags, stickers, and labels that are attached to or placed on the equipment.
YMGI: Engineered Comfort Products for An Efficient
DC INVERTER MULTIPLE ZONE (59)2 EC
SAFETY WARNING
and Sustainable Green World!
NOTICE
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Related Manuals for YMGI WMMS-12EC-V2B592
Summary of Contents for YMGI WMMS-12EC-V2B592
- Page 1 WMMS -24EC-V2B(59)2 Thank you for choosing this YMGI product. Please read the user’s manual carefully before installation/operation and retain for your records and future reference. If you need a replacement copy, please contact your local agent or visit www.ymgigroup.com to download a current electronic version.
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Page 2: Table Of Contents
Cleaning and Care ............................39 Cleaning Air Filters ............................39 Cleaning Air Intake ............................40 Troubleshooting ............................. 41 Error Codes for the Indoor Unit ........................43 Installation, Maintenance and Service Notes ....................47 YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 3: Introduction
Refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs), may affect the ozone layer. Not all refrigerants have the same potential impact on the environment. YMGI Group advocates for the responsible handling of all refrigerants including industry replacements for CFCs such as HCFCs and HFCs. -
Page 4: Copyright
Copyright This document and the information contained therein are the sole property of YMGI Group and shall not be used or reproduced in whole or in part, without the written permission of YMGI Group. YMGI Group reserves the right to revise this manual at any time and to make changes to its content without obligation to notify anyone about any modifications, revisions or changes. -
Page 5: Note From Ymgi
YMGI Group is the MEDIA AUTHORITY: YMGI Group, located in O'Fallon, MO 63366 is the author of all media produced for its products and is the only party able to give any additional explanation for any data, definitions and or descriptions found within any of its media, including but not limited to YMGI product brochures, manuals, pamphlets, catalogs, and videos. - Page 6 With the information provided above, you will know some things to look for and questions you can ask. If at any time you feel there may be an issue with the installation, please have your technician contact YMGI at (866)833-3138 x 703 with any questions, issues or concerns you may have.
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Page 7: Installing Technician/Contractor's Responsibilities
You are the only one qualified to determine what other materials you need to complete the installation. When connecting electrical wires, follow all NEC, state and local codes and ensure the installation of all YMGI units and acc essories meet these requirements. -
Page 8: Limited Product Warranty
Compressor: YMGI will warrant the compressor of a YMGI-validated and approved warranty filing, for a period of 10 years from the date of successful installation at its original installation location. Parts: YMGI will warrant parts of a YMGI-validated and approved warranty filing, for 5 years from the date of successful installation at original installation location. - Page 9 YMGI Technical support the exact part(s) needed to fix the problem(s). 2. YMGI will check the customer's warranty filing. There will be no charge for Parts with a validated and approved warranty. Any Parts needed for warranties that have not been validated and approved or have an invalid warranty filing (resulting in an unapproved warranty request), will be charged accordingly.
- Page 10 YMGI • Your Modern Green Idea YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
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Page 11: Why Require Professional Installation
Some contractors/technicians may not feel comfortable installing equipment that has been purchased by someone other than themselves. You can contact YMGI directly to check and see if there are contractors in your area who have installed our products or any similar products. -
Page 12: Safety Precautions
YMGI Group recommends that only properly trained and authorized personnel be allowed to repair or service the unit. Improper repairs or servicing can result in electric shock or fire hazards. Please contact YMGI Group if you need help locating a qualified repair or service technician. -
Page 13: Brief Introduction To Ceiling Cassette Mini Split System
These units are designed for applications at: Residential Institutional Commercial Light commercial Industrial Hospital YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 14: Indoor Unit Diagram
YMGI • Your Modern Green Idea Indoor Unit Diagram YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 15: Specifications
Watch unit operation during extreme weather conditions in summer and winter. Wind baffle helps system cooling & heating performance in low ambient temperature ranges. Heating capacities up to 85% @ 17°F ambient temperature, up to 60% @ -4°F varying upon geographic location and actual installation. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 16: Unit Dimensions
7 1/16” 1 27/32” 4 3/8” 5 5/32” 24k Btu/h units Model WMMS-24EC-V2B(59)2 37 13/32” 37 13/32” 33 3/32” 33 3/32” 9 13/32” 1 27/32” 4 3/8” 5 5/32 YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 17: Wiring Connections
YMGI • Your Modern Green Idea Wiring Connections WMMS-12EC-V2B(59)2, WMMS-18EC-V2B(59)2 WMMS-24EC-V2B(59) 2 Model Power Supply MCA (A) MOP (A) WMMS-12EC-V2B(59)2 WMMS-18EC-V2B(59)2 208/230V-1ph-60Hz WMMS-24EC-V2B(59)2 YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 18: Recommended Tools
Sharp Plier Cable Ties Black Tape for Electrical Use Electrical Meter 4. Trial Running Units and Inspection Clamp Meter Manifold Infrared Thermometer YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 19: Installation Instructions
Check to be sure you have all the additional parts and accessories that are required for the installation and those provided with the unit. It is strongly recommended to only use YMGI supplied or approved parts and accessories. Be sure a properly sized circuit breaker is installed for the electric power suppling the units. -
Page 20: Installation Accessories
Small sealing pad 3*30*150 Sealing bar 120*65*25 PVC tape Screws ST4.2 9.5PA For mounting the remote Remote control control unit Battery AAA 1.5V For remote control Power control wire YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 21: Installation Clearance
Notes: 1. Keep enough distance from the kitchen heat sources. 2. The appliance should not be installed in a laundry. CEILING OPENING AND SUSPENSION BOLT (M10) PITCH DEMENSION YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 22: Hanging Preparation
When desiring a high drain pipe height, raise it up to 15" or less from the ceiling within a range of 6" from the body. Arise dimension over this range will cause leakage. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! - Page 23 1. Connect the connector in accordance with the part spring washers, and washers. A detail. 2. Then clamp the lead wire with clamp so that it does not touch the rotating parts. Part A detail view YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
- Page 24 3) Open the intake grille so that it is at a 20 3) Install so that there is no gap between the grille ° angle, and then remove the grille. assembly and the air conditioner body. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
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Page 25: Connecting Refrigerant Pipes
Tightening torque (N·m) Φ6.25 (1/4") Φ12.7 (1/2") 15~20 50~55 Φ9.52 (3/8") Φ15.9 (5/8") 30~40 60~65 FINISHED INSTALLATION ABOVE CEILING Mounting-Threaded Rod Hung on Truss Mounting-Threaded Rod Hung on Rafters YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 26: Electrical Wiring
4. Position the round terminal wire, replace and tighten the terminal screw using a screwdriver. ATTENTION : An all-pole disconnection switch, with a contact separation of at least 3mm at all poles, should be connected in fixed wiring. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 27: Test And Check Items After Installation
Volume of refrigerant charge in the system is not correct. made? Note to the installer: Be sure to instruct the customer how to operate the system and show him/her the attached operating manual. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 28: Safety Precautions
COOL mode is compatible with DRY and FAN mode. In other words, there will be no problem for some indoor units to run COOL, while others may run in any of the following modes: COOL, DRY (Dehumidifying) and FAN. No Protection/Error code will show up. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 29: Connect Refrigeration Pipes Between Indoor Unit And Outdoor Unit
Too much torque may damage and break the flare/nut seal. Too little torque may not ensure a good seal. ALWAYS use a pair of wrenches when tightening. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! - Page 30 Use an elbow tool for consistent Do not make bends that are less than 90 degrees. bending radius. Maintain the minimum bending Do not bend shot pipes. radius. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
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Page 31: Vacuum Testing And Charging
For Multi-Zone systems repeat this process for each zone with indoor units attached to it. If all zones are not being used, check the flared nuts on the unused valves, and ensure that they are tightened to avoid any potential system leaks. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 32: Remote Controller
YMGI • Your Modern Green Idea YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 33: Remote Functions
Unit system, you cannot run one Indoor Unit in COOLING Mode and one in HEATING. Attempting to do this will create a mode conflict, and you will receive an E7 Error Message on your Indoor Unit Display. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! - Page 34 Once you have the clock set to the correct time, press the CLOCK button a second time. The CLOCK ICON will stop blinking. TIMER ON When the unit is OFF the REMOTE CONTROL will turn on in whichever mode you had selected when the Indoor Unit was last running. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
- Page 35 If the REMOTE CONTROL is out of range or loses contact with the Indoor Unit, after 10 minutes, the system will turn off U-TOUCH and resume normal function at the previous settings. If U-TOUCH is not in use, all ambient temperatures will be sampled using the sensor on the Indoor Unit. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
- Page 36 When checking the room temperature, the temperature range for the sensor is 32-86°F on the indoor temperature displays. Fan Speed Display Press the FAN SPEED button to select the air flow speed you want: YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
- Page 37 Unit AC voltage decreasing down frequency Blink 10 times Heating anti-high temperature down frequency Blink 10 times Anti-cool air protection Blink 9 times Cooling oil return Blink 7 times YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
- Page 38 If the wireless remote control will not be used for an extended period, it is recommended to remove the batteries. Leaving the batteries in could cause them to leak. This can cause damage to the remote control. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
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Page 39: Cleaning And Care
Replace the air filter into its holder. Make sure the air filter makes contact with the filter stopper when it is replaced into its holder. Shut the air intake grille. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 40: Cleaning Air Intake
2. Clean the filter and the body of the unit. 3. Clear any dust. 4. If there is any rust deep inside the outdoor unit, may need to use an extended head cleaning tool. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! -
Page 41: Troubleshooting
3. Before or after the maintenance, check whether the user power socket, terminal block on indoor/ outdoor unit and all connectors on main board (especially the main board of outdoor unit, power module and PFC module) are loose or not. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! - Page 42 This is caused by the odors in the room Discharged air smells During operation which have been left or kept on the filter or coil, clean the filter and coil YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
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Page 43: Error Codes For The Indoor Unit
Four times Outdoor pipe temp. sensor malfunction Five times Outdoor air exhaust temp. sensor malfunction Eleven times E2 PROM Error Eleven times Wire control ambient temp. sensor malfunction Blink once YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! - Page 44 Indoor pipe temp. sensor malfunction Outdoor ambient temp. sensor malfunction Outdoor pipe temp. sensor malfunction Outdoor air exhaust temp. sensor malfunction E2 PROM Error Wire control ambient temp. sensor malfunction YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
- Page 45 The reserved outdoor unit displays Blink 11time Malfunction of ambient Display the malfunction of indoor ambient temperature temperature sensor on wire sensor when using this temperature sensor (Green light: controller blink once) YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
- Page 46 Ceiling Cassette indoor unit only has 3 indicators, no dual 8 display on the unit. Only the ceiling cassette indoor unit has the water overflow error protection. Floor ceiling type and duct type indoor fans are not built with this error protection. YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
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Page 47: Installation, Maintenance And Service Notes
Technician Checklist Date Phone & HVAC License # Technician Completed Fully? SERVICE / MAINTENANCE NOTES Company Name, Technician Name, Date Service or Maintenance Performed Phone & HVAC License # YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World! - Page 48 YMGI • Your Modern Green Idea YMGI is dedicated to designing, manufacturing and distributing the highest quality, energy saving and environmentally friendly air conditioner and heat pump products, while providing the best service and support to all of our customers.
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