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CONTENTS

MUST READ-1

All Units Shall Be Installed by Experienced or Licensed Contractor Or 

Technician. Read Manuals before Installation.

YMGI Group Shall NOT Take Any Responsibilities for Any Damage or 

Loss Due to Do-It-Yourself(DIY) self-installation and other Improper Installation or Operation or 
Natural Disaster.

Connect All Wiring Securely. Loose Wire or Other Bad Contact May Cause 

Arc or Overheating and Fire Hazard.

Following NEC, State and Local Codes and Installation Instructions of All 

Units, Otherwise Unit Warranty Will Be Void and Serious Damage To People Or Property May Be 
Caused.

Don't Supply Power until All Wiring and Tubing and Checking is 

Completed. Ground the Unit Following Instructions and NEC, State and Local Codes.

P2 OF 44

P1 OF 44

INTRODUCTION

NAMES OF PARTS

UNIT SPECIFICATIONS

RECOMMENDED TOOLS FOR INSTALLATION

INSTALLATION NOTES

INSTALLATION ACCESSORIES

INSTALLATION CLEARANCE

INDOOR UNIT INSTALLATION

WIRING DIAGRAMS

TEST AND CHECK ITEMS AFTER INSTALLATION

SAFETY CAUTIONS

OPTIMUM OPERATION

TROUBLE SHOOTING

CARE AND MAINTENANCE

WARRANTY AND TECH. SUPPORT

LIMITED PRODUCT WARRANTY POLICIES

LIMITED PRODUCT WARRANTY REGISTRATION CARD

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2

5

43

CUSTOMER AND TECHNICIAN MUST READ

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YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !

YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !

REMOTE CONTROL-BUTTON NAME & FUNCTIONS

USER NOTES AND INSTALLATION/SERVICE/MAINTENANCE NOTES

WELCOME AND PLEASE READ THROUGH MANUALS

WELCOME AND PLEASE READ THROUGH MANUALS

INSTALLING TECHNICIAN/CONTRACTOR'S JOBS AND RESPONSIBILITIES

Toll Free Number: (866)833-3138
Email: [email protected]

If you have any questions about your unit or even doubt if the unit has any problem, you can first check against 
the mannds. If you can not find answers, then you can contact your local installer or service technician to 
physically inspect the unit.  If at the time of inspection the installer or service technician have any questions they 
can contact YMGI technical support division directly at:

Dear Customer(s)/end User(s)/unit Purchaser(s)/installer(s)/Contractor(s):

Thanks for choosing YMGI products.

The YMGI equipment you purchased is either a split-type or a self-contained cooling/heating system which 
requires an installer's license, certification, knowledge, experience, carefulness and details for a successful and 
good installation. This equipment is different from those window or portable air conditioners you can normally 
purchase from local retail stores such as Home Depot, Lowe's, Sears, etc. which the manufacturer may not 
require licensed personnel to install. 

Reading and following the YMGI Group's recommendations, suggestions, and requirements, written in the 
following pages and other documents, is the first step to ensuring a smooth and trouble free installation & proper 
operation of your products for many years to come.

YMGI Group, POB 1559, O'Fallon, MO 63366 is the only party who holds the final explanation (in authorized 
writing) about any descriptions or data in YMGI-published materials, including but not limited to 
YMGI product brochures, manuals, pamphlets, catalogs, videos and any other media. YMGI's distributors, 
installers, dealers, agents, customers or any other third parties shall not supersede YMGI to make any 
explanation about what YMGI-published materials mean. Any uncertainty or questions, arising from YMGI 
distributors, installers, dealers, agents, customers or any other third parties, should be passed directly to YMGI 
for an explanation in writing.

IMPORTANT NOTE-YMGI HOLDS FINAL EXPLANATION:

The quality of the installation plays a key role in whether the units will work well and for an extended period of 
time. The information we provide in our manuals is for the sole purpose of reminding you and your installer.

It is our ultimate goal to help insure that your YMGI units are installed properly and correctly from the very 
beginning to the very end. This ensures that your YMGI units will work well and not only provide a comfortable 
room but also peace of mind.   

YMGI doesn't recommend nor allow any do-it-yourself (DIY) installation (partially or fully), since DIY will cause 
problems sooner or later to your units and your upfront saving is Not saving down the road.

YMGI warranty doesn't cover any DIY units.

Summary of Contents for WMMS-12EC-V2B

Page 1: ...LIT WMMS 59 2 EC DC IVTR II 20131130 For Ceiling Cassette Styles 59 12 to 24K Btu h Cooling and Heat Pump This Manual is Subject to Change to Reflect Our Continuous Effort for Engineering Improvement without Prior Notice YMGI is the Trademark and Property of YMGI Group Copyright of YMGI Group 2013 YMGI Engineered HVAC R Products for Maximum Green World and Better Tomorrow YMGI Group POB 1559 O Fal...

Page 2: ...al support division directly at Dear Customer s end User s unit Purchaser s installer s Contractor s Thanks for choosing YMGI products The YMGI equipment you purchased is either a split type or a self contained cooling heating system which requires an installer s license certification knowledge experience carefulness and details for a successful and good installation This equipment is different fr...

Page 3: ...re humidity ranges installation operation maintenance service warranty parts and so on 4 Properly select correct most suitable YMGI product models of units and accessories for your HVAC applications jobs and list them in your proposal quote in writing on your company s quote form or letter head basing upon the information you get from 1 2 and 3 above 5 List your currently valid HVAC license and EP...

Page 4: ...the installation 5 Supply electrical power V Ph Hz measured at wiring terminal block of Indoor unit outdoor unit 7 Wire gauge length and terminal colors between circuit breaker disconnect switch to outdoor unit 9 The size of HVAC circuit breaker fuse or disconnect switch to the outdoor unit 11 What is the refrigerant pipe length between each indoor unit and the outdoor unit Unit A Unit B Unit C Un...

Page 5: ...thorized contractor in YMGI list that is close to you otherwise 4 Authorized Distributor in YMGI Distributor list otherwise 5 Contractor Distributor you prefer who is close to you CONTACT FOR GENERAL TECHNICAL QUESTIONS OR SUPPORT IN A SEQUENCE 1 The original installer otherwise 2 The current service contractor otherwise 3 The distributor where the unit is purchased from otherwise 4 YMGI Technical...

Page 6: ...s Net L x W x H In Package L x W x H In Net LBs Packaged LBs 20 40 40 HQ WMMS 12EC V2B 59 2 208 230 1 60 187 253V 13900 12000 5200 13000 11600 9000 16 8 2 2 96 353 312 245 25 18 Upon Mounting Height Speed Temp 0 39 37 35 49 47 45 FN11T 2 Single 700 600 515 11 50 1 Centrifugal 1 11 1 x 5 8 MP35CB 2 2 NA T3 15A 250V 0 2A Alu Fin Inner Grooved Copper Tube Blue Yes 1 4 3 8 1 22 Yes 25 Yes Standard Was...

Page 7: ...te circuit and suitable fuse Be sure to install an earth leakage breaker Diameter of power supply cord must be big enough Refer to P24 about the sizes of diameter If the supply cord is damaged it must be replaced by the manufacturer or its service agent or a similarly qualified person in order to avoid a hazard The appliance shall be installed in accordance with relative wiring regulations 2 Pleas...

Page 8: ...ot installed in the laundary CEILING OPENING AND SUSPENSION BOLT M10 PITCH DEMENSION HANGING PREPARATIONS Firmly fasten the hanging bolts as shown in Fig 4 or by another method Fig 4 Fig 5 Keep clearance 12Ft or more Exhaust of large capacity Heat 22 5 22 5 9 1 25 6 25 6 1 97 12EC 18EC 24EC W L H a b c 33 1 33 1 9 1 37 4 37 4 2 4 22 5 22 5 9 1 25 6 25 6 1 97 Fig 3 W a L c b H a b INSTALLATION ACCE...

Page 9: ...nut B onto the hanging bolt Fig 6 2 Raise the body and mount its hooks onto the hanging bolt between the special nuts Fig 6 3 Turn special nut B to adjust the height of the body Fig 6 4 Use a level or vinyl hose filled with water to adjust the unit to level Warning Fig 6 INDOOR UNIT INSTALLATION INSTALLING DRAIN PIPE NOTE Install the drain pipe Install the drain pipe with a downward gradient 1 50 ...

Page 10: ...nd outdoor unit wiring terminal Note The temperature of refrigerant circuit will be high please keep the interconnection cable away from the copper tube An all pole disconnection device which has at least 3mm separation distance in all pole and a residual current device RCD with the rating of above 10mA shall be incorporated in the fixed wiring according to the national rule CONNECTION OF REFRIGER...

Page 11: ...and tighten the terminal screw to hold the exposed solid wire loop securely B For strand wiring 1 Cut the wire end with a wire cutter then strip the insulation to about 3 8 10mm to expose the solid wire 2 Using a screwdriver remove the terminal screw s on the terminal board 3 Using a round terminal fastener or plier securely clamp a round terminal to each stripped wire end 4 Position the round ter...

Page 12: ...AFTER INSTALLATION 1 Prepare for test 1 Do not turn on the power switch before all installation is finsihed 2 Connect wires correctly and firmly 3 Open the check valve 4 Remove all dust 2 Testing 1 Turn on the power switch and press ON OFF button 2 Press MODE button to select COOL HEAT FAN etc to test whether it operates normally 3 Emergency operation When the unit is stopped you can press the AUT...

Page 13: ... turned off TIMER ON BUTTON This button allows you to set a time you would like the unit to turn on The clock is a 2 hour clock Press the TIMER ON button once and you will see the word ON flashing next to a time displayed By pressing either the or the button choose the time you would like the unit to turn on Once you have the desired time displayed on the remote press the TIMER ON button once more...

Page 14: ...sappear from the remote screen By doing so the return air temperature will take the place of remote local temperature as the unit s target temperature U TOUCH is what YOU WANT U TOUCH feature brings to you a true comfort level wherever and whenever you want SWING BUTTON Hold the swing button symbol shown above for more than 2 seconds and the indoor air louver will start to swing between the highes...

Page 15: ...ower 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 loosened or not GENERAL PROCEDURES TROUBLE SHOOTING OPTIMUM OPERATION Adjust the room temperature properly Adjust the room temperature properly for a comfortable environment Never place anything under the indoor unit that is to be kept dry Tur...

Page 16: ...d will turn low after 1 minute This is caused by the refrigerant flowing inside the unit This is the noise of refrigerant caused by flow stop and flow change The noise is heard when the drainage pump is in operation No need to do anything NORMAL OCCURRENCE When normal occurrence happens Normal Occurrence Cause and remedy of normal occurrence TROUBLE SHOOTING Warning In case of something abnormal s...

Page 17: ...ent temp sensor malfunction E1 E2 E3 E4 E5 E6 E3 E3 Defrost E5 F2 E5 E5 E9 E9 F0 F1 F3 F2 F4 E3 F5 Code indication on display Meaning NO TROUBLE SHOOTING ERROR OR PROTECTION CODE INDICATION NO Error or protection codes LED red LED yellow LED green 1 Compressor high pressure protection unit stop Blink once 2 Indoor unit anti freezing protection Twice times 3 Low pressure protection unit stop Three ...

Page 18: ...temperature sensor when using this temperature sensor Green light blink once Blink 15 times Malfunction of jumper cap Water overflow protection Indoor ambient temperature sensor is open circuit or short circuit 2 1 3 4 5 Indoor evaporator temperature sensor is open circuit or short circuit Malfunction of ambient temperature sensor on wire controller TROUBLE SHOOTING ERROR CODE LIST Malfunction nam...

Page 19: ...before starting the air conditioner 1 Clean the filter and the body of the unit 2 Turn off power 3 Clear dust 4 If there is any rust deep inside the outdoor unit may need to use an extended head cleaning tool End of Seaseon Cleaning CARE AND MAINTENANCE CARE AND MAINTENANCE Pull out the power plug before cleaning Do not splash water directly to the unit WARNING Note 5 Shut the air intake grille Re...

Page 20: ...ing to include a 1 year installation service warranty at no extra charge Check with them to see if that is available If available include that in the contract 14 Verify and confirm the installation is done completely and all the unit functions have been checked and are working properly all the items in the checklist have been checked and marked well in the warranty registration card form prior to ...

Page 21: ...e exceptions Most have resulted in equipment failure due to lack of knowledge and experience A few of the problems result from DIY s lack of knowledge in the following areas Sizing and selecting correct type size and model of cooling and or heating equipment Sizing and installing correct electric circuit breakers and wires Wiring the units correctly and properly Taping the ends connecting to indoo...

Page 22: ...different from what are typical in traditional split type air conditioning and heat pump systems and similar systems made by other manufacturers These are not defects Take some time to learn the functions of your unit We will be happy to assist you with any questions you may have concerning the functions of your new unit 1 Part repair or replacement after trouble shooting This is the most common a...

Page 23: ...tever questions you have or problems you have seen as a unit history No Date USER NOTES AND INSTALLATION SERVICE MAINTENANCE NOTES Notes Asked for Your Technician for Help Did You Ask YMGI Tech for Help INSTALLATION NOTES Original Installation Company Name Technician Name Phone HVAC License Job Not Performed by Technician Technician Checklist Completed Fully SERVICE MAINTENANCE NOTES No Date Conte...

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