MG WMMS-12EC-V2B(59), WMMS-24EC-V2B(59), WMMS-18EC-V2B(59) User Manual

This product is designed and manufactured free from defects in material and workmanship under the normal use and
maintenance. Installation, operation, maintenance and service shall follow or Local Codes and related manuals from us.
Otherwise, damage to equipment or property even injury to people may occur.
Installer: Read this instruction manual before installation. Remember to complete in full the warranty cardon the back
of this manual warranty card.

User: Keep this instruction manual for future maintenance and service use.
Servicer: Use this instruction manual for service reference.

Literature Part No.: 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'Fallon, MO 63366, USA

Tel: [phone] Fax: [phone]

Web Site: www.ymgigroup.com

Email: [e-mail]

WMMS-24EC-V2B(59) (2)

LITERATURE: LIT-WMMS-(59) (2)-EC-DC IVTR-II-20131130

INSTALLER'S INSTRUCTION & USER'S MANUAL

DC INVERTER MULTIPLE ZONE (59)2

SYMPHONY CHOIR

INDOOR UNIT-CEILING CASSETTE (EC)

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

WMMS-12EC-V2B(59) (2)
WMMS-18EC-V2B(59) (2)

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 4 4P1 OF 4 4

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

8

9

10

11

12

13

13

14

19

21

22

23

27

28

35

37

4

2

5

43

CUSTOMER AND TECHNICIAN MUST READ

6

7

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: [phone]
Email: [e-mail]

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.

MUST READ-1

MUST READ-1

P4 OF 4 4P3 OF 4 4

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

1. Be sure to hire only one certified, licensed HVAC Company to complete 100% of the installation so that all
details of the installation are clear, complete and well taken care of.

2. Be sure to have ONLY the licensed HVAC professional perform all parts of the installation. Factory Warranty
will be lost if any portion of the installation is not performed by licensed HVAC contractor. DIY or partial DIY will
void ALL factory warranties. One example of partial DIY would be calling the HVAC technician to release
refrigerant or the sort while other installation has or is to be conducted by non-HVAC technician.

3. With hiring a technician that is offering their services as a "side job" and not through their licensed HVAC
company may pose a possible risk of an incomplete or unsatisfactory installation of no guaranteed
workmanship and lack of further service, if needed.

4. Have the installing technician read in full the installation manual of the product model you have. Some details
may vary and some may be the key to determine the success and quality of the installation. Experience with
certain manufacturer may not be applied fully to another manufacturer. For example, wiring, refrigerant
adjustment and trial testing procedures may differ from manufacturer to manufacturer and model to model.
Any ignoring or negligence may cause unit failure or damage which could be irrevocable and permanent.

5. All of YMGI's products are fully tested and have passed rigorous safety and performance standards and others
related to the industry, before being packed and shipped. YMGI only uses famous brands as suppliers for their
parts that are also known for their high quality and performance. The quality of the installation plays a key role
as much as up to 90% importance in your unit's overall performance and lifetime. A poor installation can result
in unit failure and inefficiency either immediately or over a period of time.

6. Some licensed contractor/technician may make a mistake some time. YMGI doesn't supervise nor is able to
control their installation.It is key that the installer take each variable into account during the initial

installation in order to ensure a complete and professional installation and properly working units.

ATTENTIONS

The following will cause damage to the unit and key components factory
warranty:

and the loss of your unit's

1. Any foreign substances introduced into the system as a result of failure of not sealing the ends of the
refrigeration piping before pulling through structures at time of installation.

2. Not installing an oil P-trap in the suction copper line where indoor unit is located 18' or more below outdoor unit.

3. Cross piping and/or cross wiring on any units including more than one single zone or a multi zone system.

4. Not conducting a positive leak check by charging the system with dry-nitrogen and soap bubble testing.

5. Not conducting a negative leak check by evacuating the copper lines for 30 minutes. Vacuum must be held at
500 micron or better for at least 5 minutes, starting from 5 minutes after the vacuum pump is shut off.

6. Not conducting a positive leak check prior to the negative leak check.

7. Not selecting the correct size of wire or circuit breaker.

8. Not answering ALL questions in the technician's checklist inside the warranty registration form.

1. Any kinks or improper bending of the copper piping.

2. Any improper flaring or not centering of the flare with the nut, or not tightening any connection.

3. Not trial testing each indoor unit individually.

4. Not reading technical data (temp/time/pressure/current) after the system is stabilized (normally compressor
needs to work at least 10 minutes). Data read too early may lead to inaccurate or false judgment or even a
false sense of security.

In an effort to protect our customers from any possible faulty installation which can lead to premature unit failure,
we like to provide the above information to you in addition to the technician. You can judge yourself and
observe while your system is being installed, though your observation may not be treated as any guarantee
whether your system would be installed properly and professionally. If at any time you feel there may be an
installation issue, please have your technician contact YMGI at [phone] x 703 to clear your questions.

The following may be overlooked, ignored, or treated as not a problem during your installer's installation,
but actually will cause your unit to underperform or even cause unit failure.

WELCOME AND PLEASE READ THROUGH MANUALS

1) Check with the customers to find out detailed information of structure to be conditioned, local weather (typical design and
extreme temperature/humidity conditions, cooling and heating hours), previous and existing HVAC equipment, usage and
dependence on the new HVAC equipment or the YMGI products.

2) Performing a cooling/heating load calculation by using commercially available professional programs/methods such as
Right-J (Manual J) for residential HVAC applications/jobs and Right-CommLoad (ASHRAE RTS/CLTD) for light commercial
and commercial HVAC applications/jobs.

3) Check with YMGI distributor/sales or contact manufacturer directly to obtain information to fully understand YMGI products,
including but not limited to product features, cooling/heating performance-at standard ratings/conditions and extreme
conditions, allowed indoor and outdoor temperature/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 EPA # in your proposal/quote.

6) Make sure you are the only party to perform the whole installation job and you will not sub-contract any part of the
installation to any non-licensed parties/persons. You will be solely responsibile for the full installation that you have been
contracted for.

7) Check to make sure you have all the materials you need to properly and correctly finish the installation. The YMGI units
and accessories may be just a portion of what you need. YMGI employees and YMGI distributors/sales, dealers and agents
are not installers and may only be able to provide suggestions to you, but you are the only sole decision maker to
determine what other materials you must need and/or the customer may want to fulfill the installation job.

8) Check against both NEC and your local codes to make sure all the installation of YMGI units and accessories meet these
requirements.

9) Connect the unit to correct electrical power source. In the area where lightning or storm incurs frequently, a proper type/
size of power surge protector needs to be installed between the outdoor unit and power source.

10) Select proper types and sizes of HVAC circuit breakers, disconnect switch boxes, wires and conduits from circuit breaker
to disconnect box and then from disconnect box to outdoor unit.

11) Select proper location to mount indoor units and outdoor units with all factory requirements being followed (cooling/
heating/air is not blocked or restricted, mounting structure is secure, aesthetical looking, installation convenience is
considered, maintenance/service clearance is ensured and all applicable codes are met and etc.).

12) Cap/tape the two ends of every copper line before running them through structures to keep from any foreign substances
entering into pipe and causing contamination. Label them A-A, B-B, C-C, D-D, or other marks on each pair of copper
line/wiring cable set to keep from any possible cross-piping or cross-wiring in multiple zone installations or where pipes for
different single zone systems are close to one another.

13) Secure the wiring cables that connect between indoor unit and outdoor unit, following applicable NEC and local codes for
your particular installation. If there is no special NEC or local code to govern how these wires are to be installed, you can
tape/cable tie them along with insulated copper line.

14) Tighten all pipe and wire connections to keep from any possible leakage or false connection.

15) Conduct positive pressure leakage checking of inter-connecting copper lines between each indoor unit and outdoor unit by
charging dry-nitrogen at outdoor unit service port (note: don't back-seat stopping valve, at this time). Liquid soap solution
shall be applied at all pipe connections to check for leakage. A1/4-5/16" hose/valve adaptor may be needed if you have
traditional manifold of 1/4" connection hose.

16) If there is no positive leaking, then conduct negative pressure leakage checking of inter-connecting copper lines between
each indoor unit and outdoor unit by pulling vacuum at outdoor unit service port (note: don't back-seat stopping valve, at
this time) and checking if the vacuum level 500 Micron can be held for at least 20 minutes.

17) If there is no leakage found at refrigeration pipe connections, flip up the indoor unit face panel and remove filter, carefully
pour some clear water onto the up-right aluminum coil surface to test if the water can drain out of each indoor unit freely
without any leakage being found.

18) If there is water leakage found, locate the source of the leak and correct. Only after everything is clear engage the correct
electrical power to the system.

19) Then back-seat stopping valves of outdoor unit to release refrigerant from outdoor unit into inter-connecting pipes and
indoor unit.

20) Check to make sure both indoor unit and outdoor unit are powered on correctly before controlling the indoor unit to
operate in fan mode first. Then move on to test cooling, dehumidifying/drying, heating and other modes.

21) Read refrigerant pressures and pipe/valve temperatures only until the system is stabilized (normally 10 minutes after
cooling/heating mode is started successfully). Put this data into the technician checklist in the lower half section of the
Limited Product Warranty Registration Card/Form.

22) Adjust refrigerant charging level (remove refrigerant if pipe is shorter/temperature is colder; add refrigerant if pipe is
longer/temperature is warmer), following manufacturer's instructions, if average pipe length is shorter or longer than 25'
and pressure/temperature readings at outdoor unit service valves are not falling into normal ranges.

23) Explain to the user/owner(s) about proper unit operation and maintenance and leave your contact information for them to
reach you easily.

24) If the customer finds the unit doesn't work properly and cannot resolve the issue themselves, check the customer's
units/parts/accessories and correct the problem if there is any. Communicate with YMGI-technical support line (866)833­ 3138 x 703, if needing help.

Following these requirements will aid in ensuring the units to be installed to the general HVAC practicing standards and
necessary factory requirements, finding any possible problems early, preventing any further damage to the unit and helping
ensure a properly working unit over its lifetime.

INSTALLING TECHNICIAN/CONTRACTOR'S JOBS AND RESPONSIBILITIES

WARRANTY POLICIES

AND REGISTRATION

CARD/FORM

WARRANTY POLICIES

AND REGISTRATION

CARD/FORM

P5 OF 4 4 P6 OF 44

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

LIMITED PRODUCT WARRANTY POLICIES

The YMGI products are designed and manufactured free from defects in workmanship, and materials for normal
use. However, for any reason, including many handlings and occasions between the YMGI factories/warehouses
and where you receive the products, the unit doesn't work, YMGI Group will help to remedy the occurrence in the
following warranting ways:
Compressor: YMGI will warrant the compressor of YMGI-validated and approved warranty filing, for a period of
5 years from the date of successful installation at original location.
Parts: YMGI will warrant parts of YMGI-validated and approved warranty filing, for one year from the date of
successful installation at original location.

All warranty compressors and parts replaced will become the sole property of YMGI Group and must be returned
to YMGI Group upon request. Warranty parts may be new or refurbished. All parts are tested and approved
before shipping.

At no time does the YMGI Group warrant labor cost of any type. Warranty will start from the date of
successful installation at initial location, or 90 days as of original shipping date from YMGI Group,
whichever comes first.
This is a standard warranty of limited liability and DOES NOT cover the following:

* Any damage or repairs to properties, or persons as an incident or consequence of improper or faulty
transportation, installation, operation, maintenance or service.
* Damage caused by frozen or broken water hoses or refrigeration pipes in the event of equipment failure.
* Any damage as a result of floods, fire, wind, lightening, accidents, corrosive atmosphere or any other conditions
beyond the control of YMGI Group.
* Any damage due to interruption or inadequate electrical service to equipment.
* Any products that are installed outside the US or Canada.
* Any unit that has been moved from the original installation address.
* Any labor costs associated with the installation or service of the unit.
* Poor unit performance due to improper unit selection (SEER, Unit size).

To validate the above warranties, ALL the following conditions must all be fulfilled:

1. The unit was fully (100%) and successfully installed by licensed or certified HVAC technicians.

2. The unit was installed following all NEC, state and local codes.

3. The unit was installed following all instructions and manuals made by YMGI Group.

4. ALL fields, especially the technician-checklist, of the Limited Warranty Registration Card/Form were filled
completely by the installing technician and signed by both the installing company technician and the unit owner.

5. The Limited Warranty Registration Card/Form and a copy of the original installing company's invoice had
been received by YMGI Group-Warranty Dept., POB 1559, O'Fallon, MO 63366, within 7 days of successful
installation.

No warranty filing will be validated or approved, if any one of the above 5 conditions is not met.
Product registration doesn't guarantee the validity of this limited warranty statement.

Steps to follow for warranty part replacement:

1. Installing or service technician contacts YMGI tech support at 1-866-833-3138 ext 703 from the jobsite, to
double-check and confirm with YMGI Technical support the exact part(s) needed to fix all the problems.

2. YMGI will check the customer's warranty filing. Parts for validated and approved warranty will not be charged.
Parts of invalid warranty filing or unapproved warranty requesting, will be charged accordingly.

3. YMGI will ground ship out the parts ASAP. Expedited shipping is available at the customer's cost.

4. Replacement parts of approved warranty registration are to be warranted for the remainder of the 1 year parts
and 5 year compressor warranty. Purchasing of replacement parts of invalid warranty filing or unapproved
warranty requesting, will be as they are and bear no warranty.

YMGI keeps on improving products with various engineering changes without prior notice. Such improvements
or changes include but not limited to product specification, appearance, functions, sizes, packaging and others.
These improvements or changes will not void the limited warranty stated herein. YMGI keeps the final explanation
of this warranty policy.

LIMITED PRODUCT WARRANTY REGISTRATION CARD

LIMITED PRODUCT WARRANTY

REGISTRATION CARD / FORM

YMGI to Fill Top Portion, at Shipping, and Keep Copy A; Center Copy B for Installer to Fill and Mail back to YMGI; Bottom Copy C for Customer to Fill and Keep

Installation Finished and Unit Works Successfully.
Print Name of Installation HVAC Technician:
Signature:

Date and time:

Installation Finished and Unit Works Successfully.
Print Name of Owner:
Signature:

Date and time:

1) Are you the only one to install whole system?
If not, % of installation done by you (HVAC technician).

3) Did you read the User Manual and Installation Instruction, before you
started 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 Unit D...

13) What is the elevation difference between each indoor unit and the
outdoor unit? Unit A Unit B Unit C Unit D...
(indoor unit above outdoor unit +, below -)

15) Where is the outdoor unit located?
Ground wall balcony roof other
location or pad

17) Were the refrigerant pipe ends capped or taped seal, prior to running
them through structures to keep debris from entering the copper lines?

21) Did you check if the compressor can be started and stopped in a
correct (design) manner?

25) Have you checked all unit functions, with customer's witness, and all
functions are correct?

27) Do you provide regular one-year free technical service for this
installation?

2) What had been done, prior to your arrival?

4) Who unpacked the unit and accessory boxes to check for damage?

6) Incoming electrical power V/Ph/Hz measured at terminal blocks of
indoor unit: outdoor unit:

8) Wire gauge, length and terminal colors between each indoor and
outdoor unit: Unit A Unit B Unit C Unit D...

12) Where is/are the indoor unit(s) located?
Unit A Unit B Unit C Unit D...

16) Have you checked to make sure there is no cross-piping and no
cross-wiring between any two indoor units (zones)? How did you do it,
who was with you?

22) If copper length were not made to the supplied or recommended
refrigerant pipe length, how much refrigerant added or deducted?

26) Did you show the user how to operate the unit? Did he/she understand you?

Contact Where the Units are Installed:

Name:
Address:
City:

State (Province):

Contact of the Installing HVAC Contractor/Technician:

Technician Full Name (Print):
HVAC Technician's Company Name:
Address:
Currently Licensed or Certified HVAC Technician License or Certification Number:
Official Phone # to Check the License Validity:

Phone: Fax:
Email:
Country:

YMGI-Recommended Contractor/Technician:

Phone:Fax:
Email:
City:State (Province):

License Approved or Certified by:

The Company the
Unit Was Sold Though:

Did the Company
Pay to YMGI:

Installation Invoice Attached
to the Registration Card

For

YMGI

Use

Only

Unit #5
Unit #6
Unit #7
Unit #8

Outdoor Serial Number (One Outdoor
Unit, One Registration Card/Form):

Indoor

Serial

Number:

For Multi

Zone Units

Unit #1
Unit #2
Unit #3
Unit #4

Shipping Packing
List Number:

Registration Card
Serial No.

Date the Filled Registration
Card YMGI Received:

Unit(s) Work
Successfully (Yes/No):

Warranty
Approved

Warranty
Denied

18) Have you checked and run cooling or heating, one unit by one unit, all
working fine?

20) Did you vacuum correctly to check the connecting pipes and indoor unit for
leakage, what was the micron gauge reading, for how many minutes?

24) What were the measured temperatures (probe not touching any metal):

O O O

At cooling: indoor return air F, discharge air F, and outdoor F

O O O

At heating: indoor return air F, discharge air F, and outdoor F

23) Measured refrigerant pressures at outdoor service suction valve, when unit
was st.

O

Heat pump (PSI): Cooling (PSI): Outdoor Ambient Temp. ( F):

HVAC Contractor/
Technician--Name

Hired YMGI-Recommended
HVAC Contractor/Technician?

List for Installating HVAC Technician to Double Check Installation Quality, and Warranty Processing Purpose (if not filled by technician, or not filled fully, warranty will void)

10) Are the inter-connecting wires and copper lines between indoor and outdoor
units installed/covered/protected by line set covers, or anything else?

14) Did you check the indoor unit for condensate leakage and refrigerant
leakage, before and after connecting them?

28) Do you list the working details in the invoice and leave a copy to the
customer?

19) Did you charge the inter-connection copper pipes and indoor unit with
nitrogen to check for positive leakage (pressures 150-200PSI), before
conducting vacuuming leakage check?

By signing above, I acknowledge the liability and responsibility for any false statement or not telling all the facts, and I authorize YMGI to check the details of the filled above, and make its
decision on warranty. I understand our filing or filling the warranty card/form DOESN'T mean automatic warranty approval, because warranty is approved only to those qualified and successful
installations by qualified HVAC technician. I know the warranty, if approved, is a standard 5-year compressor and 1-year other parts only, without any labor coverage. I agree to and will follow
all the contents contained in the Limited Product Warranty Policy that YMGI, not other entity, stated in public, including but not limited to manuals, web site, email, etc.
Important Note: A copy of the installing HVAC company's invoice to show all their work details, your payment proof, center copy B of this registration card filled after a successful
installation, all three (3) MUST be mailed together to Warranty Dept., YMGI Group, POB 1559, O'Fallon, MO 63366, for warranty processing. Customer keeps bottom copy C. YMGI
will check against copy A that was kept at YMGI.

Is the outdoor unit anchored to
ground or secured onto wall
bracket?

WARRANTY POLICIES

AND REGISTRATION

CARD/FORM

BRIEF UNIT INFO

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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 !

Apartments

Office Buildings

Homes

Ceiling Mount Cassette Systems are designed for high performance, easy installation and service. Each system
consists of one or several indoor units and one outdoor unit, which are connected by one set or several sets of
interconnection refrigerant pipes and electric wires.

As shown in the following sample picture, air is drawn through the center grilles/filters and then discharged at 4
vents in 4/8 directions. In cooling mode, air passing through coil is cooled; in heating mode, air passing through
coil is heated.

INTRODUCTION

Sample Split System-Indoor and Outdoor Units
(For Continuous Engineering Improvement and Various Marketing Needs and Actual Part Availability
Reason, Unit Appearance Subject to Change or Update Continuously without Prior Notice)

The electrical and thermal power for the whole system comes from the outdoor unit. In YMGI SHCR or TTWC
series of side discharge outdoor condensing unit(s), electrical and thermal components such as compressors and
motors and heat exchange coils and others, are incorporated into the cabinet in an optimized order. These
condensing units can be either hung on the wall or installed on the ground. Once stacking or bracket kit is used,
some outdoor units can be stacked 2 or 3 units high, upon unit size and applications. Air is discharged
horizontally, quietly and smoothly. These units are a perfect fit in locations where installation and applications of
general up-flow condensing units are limited, such as apartments, condos, lofts, multi-families and high-rise
buildings and others.

Indoor unit(s) delivers the thermal and acoustical comfort to the rooms. In cooling mode, air passing through coil
is cooled; in heating mode, air passing through coil is heated. Air is filtered or treated by the built-in mechanism
(washable or enzyme equipped or electrostatic powered filter, varies from model to model), before being
delivered into the room, with more than enough comfort and care, at a wide angle (swing or not, varies from
model to model).

Application Samples-Ceiling Mount Cassette

NOTES:

Since ductless system is not designed to incorporate or use with ducted return or discharge tunnels, one single­zone unit SHALL NOT be used to take care of the cooling or heating load of more than one-story room. Several
single-zone ductless systems or multiple-zone ductless systems shall be used in this regard.

These units are designed for applications at:

* Residential * Light commercial
* Commercial * Institutional
* Industrial * Hospital

These units are designed for general T-1 weather conditions as outlined in the following table:

Outdoor unit

Air in

Air Out

Air Out

Air in

Indoor unit

WARRANTY AND TECH. SUPPORT

YMGI warrants to the purchaser/owner(s) that YMGI products be free from defects in
workmanship under the normal use and maintenance, with the standard Limited Product Warranty
Policies that comes with the unit or sales package.

material and

YMGI IS NOT RESPONSIBLE FOR

CONTACT FOR FIELD SERVICE OR REPAIR

The following people, in a prioritized sequence, will take care of your request or issue:

1) The original installer; otherwise,

2) Your current service contractor; otherwise,

3) Authorized 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 Support:
Tel: [phone]*703 Email: [e-mail]

* Regular equipment maintenance or field service or field inspection.

* Damage or repairs required as a consequence Customer do-it-yoursely(DIY) installation and/or any other faulty
installation or improper application.

* Failure to start due to voltage conditions, blown fuses, open circuit breakers, or other damages due to the
inadequacy or interruption of electrical service.

* Damage or repairs needed as a consequence of any misapplication, abuse, improper servicing, unauthorized
alteration, or improper operation.
* Damage as a result of floods, winds, fires, lightening, accidents, corrosive atmosphere, or other conditions
beyond the control of YMGI.

* Parts not supplied or designated by YMGI.
* Products installed outside USA or Canada.

* Any damages to person or property of whatever kind, direct or indirect, special or consequential, whether
resulting from use or loss of use of the product.

The original licensed installer or current service contractor should be contacted first of all, since they installed
the unit and/or know more details than anybody else.
They will check the unit and find out the problems with the professional knowledge about HVAC and electric
product installation by using special tools or instrument.
They can contact YMGI technical support for technical help during unit installation or inspection.
Product model and serial numbers needed, which can be found on unit nameplate sticker, so that our
technician can quickly identify the unit, parts and wiring diagrams, among our many products and models.

* Any problems due to improper cooling and heating load calcuation of the room/building the air conditioner/heat
pump system is to be installed. Equipment users can get the calculation schedule from your room/building
architect or your installation or related service HVAC contractor, who should have the knowledge and the tools
to do these calculations correctly.
* Any problems due to improper sizing and selecting air conditioner/heat pump system. These equipment sizing
and selection work should be conducted by either your room/building architect or your installation or related
service HVAC contractor, who should have the knowledge and the tools to do these calculations correctly, and
get your approval, before purchasing the air conditioner or heat pump equipment.
* Any problems due to improper installing of the air conditioner/heat pump system. Installation should be
conducted by currently licensed HVAC technician, following manufacturer installation instructions, all governing
safety codes, with care and professionalism.
* Any problems due to improper operation of the air conditioner/heat pump system. Users shall keep the manual
and refer to it for the correct understanding of how the unit will work and how to operate the unit correctly.
* Any problems due to improper maintenance of the air conditioner/heat pump system. Like a car, regular
maintenance or yearly checking is necessary for the unit to work properly for you, before the season comes. For
example, air filter shall be checked for cleaness from time to time. Remote control batteries shall be checked for
enough power, before judging the unit is not working...

BRIEF UNIT INFO

BRIEF UNIT INFO

P9 OF 4 4 P10 O F 44

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

UNIT SPECIFICATIONS

Items

Power Supply

Cooling Capacity (Btu/h)

Heating Capacity (Btu/h)

SEER

HSPF

Duhumidifying Capacity

Air Flow (CFM)

Air-throw (Ft.)

External Static Pressure

Sound Level

Fan Motor

Fan Wheel

Swing/Step Motor

Input Power of Ele. Heater

Electrical Protection Fuse

Evaporator Coil

Copper Line Connections

Drain Hose Connection

Condensate Pump

Refrigerant Environmental Friendly

Filter

Clean Coil Surface

Pre-heating Function

Memory of Previous Set-ups

Auto-Restart Function

Unit Dimensions

Unit Weight

Face Panel Dimensions

Face Panel Weight

Loading Capacity

Unit / Conditions

Voltage/Ph/Hz

Allowed Voltage Range

High/Standard/Low

ID 70/60, OD 47/43F

ID 70/60, OD 17/15F

ID 70/60, OD 17/5F

Btu/h.W

Btu/h.W

Pints/Hr.

High/Medium/Low

Horizontal Installation

Water In.

Pressure dB(A) (H/M/L)

Power dB(A) (H/M/L)

Model

Shaft

Speed (RMP, H/M/L)

Output (W)

Input (W)

Capacitor (uF)

Type-Piece

Diameter x Height (In.)

Model

Piece

Output (W)

Type-W

PCB / Transformer

Type

Color

Sealed by Dry Nitrogen

Flare/Nut-Liuqid + Gas

OD (In.)

Installed-Lift (In.)

R410A

Type-Feature

Size WxH (In.) - Qty.

Anti-Mildew Function

Anti-Cold Blowing

Power is Lost/Resumed

If Power is Resumed

Net L x W x H (In.)

Package L x W x H (In.)

Net (LBs)

Packaged (LBs)

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-Washable

13.56 x 13.13 - 1

Yes

Yes

Yes

Yes

22.4 x 22.4 x 9.1

33.4 x 28.7 x 12.2

39.7

50.7

25.6 x 25.6 x 2

28.7 x 26.4 x 4

5.5

8.1

102/209/246

WMMS-18EC-V2B(59)2

208-230/1/60

187-253V

20800/17200/6200

18100

16200

13100

16

8.2

3.8

353/312/245

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

Blue

Yes

1/4" + 1/2"

1.22

Yes-25

Yes

Standard-Washable

13.56 x 13.13 - 1

Yes

Yes

Yes

Yes

22.4 x 22.4 x 9.1

33.4 x 28.7 x 12.2

39.7

50.7

25.6 x 25.6 x 2

28.7 x 26.4 x 4

5.5

8.1

102/209/246

WMMS-24EC-V2B(59)2

208-230/1/60

187-253V

26500/22800/9600

27400

23800

20600

16

8.2

5.28

694/522/366

0

45/43/41

55/53/51

FN35B-1

Single

570/520/280

50

165

3

Centrifugal-1

17.7 x 4.4

MP35CB

2

2

NA

Blue

Yes

1/4" + 5/8"

1.22

Yes-25

Yes

Standard-Washable

21.38 x 21.34 - 1

Yes

Yes

Yes

Yes

33.1 x 33.1 x 9.4

37.8 x 37.8 x 12.2

66

84

37.4 x 37.4 x 2.4

40.9 x 40.4 x 4.5

14

22

72/72/144

NAMES OF PARTS

Wireless remote control

Air outlet

Built-in filter

Air intake grille

Guide louver

Drain hose

Refrigerant pipe &

connection electric wire

Note: Specifications are subject to change without prior notice.

INLTS STRT

COUP COUP-H OFST

ELBF9

ELBF4

SOFT

TEE ENDF RDER

Not to damage line sets.

LINESET COVERS

INSTALLER'S

INSTRUCTION

INSTALLER'S

INSTRUCTION

P12 O F 44P11 OF 4 4

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

INSTALLATION NOTES

Location Noise

* The air conditioner must be firmly installed and 3~
4 liability checks must be done every year.

* Avoid place within easy reach of young children.
* Avoid other heat sources or direct sun light.
* Install indoor unit away from TV set or radio.
* Avoid where flammable gas is likely to leak.
* At salty coastal areas or special areas such as the

vicinity of a sulphurous hot spring, please contact
dealer before installation to make sure it is safe to
use the unit.
* Not to be installed in laundries.
* The air conditioner must be positioned so that the
plug is accessible.

* Select a place with good ventilation or it may
affect performance or increase noise.

* Install the air conditioner on a foundation that can
withstand its weight. Insufficient strength may
result in the fall of equipment and cause injury.

* Never place objects near the air outlet or the unit,
it may affect performance or increase noise.

* If there is abnormal noise during the operating,
contact dealer immediately.

Installation and transportation

Wiring arrangement

* Installation and transportation of the unit must be
done by skilled personnel.

* Be sure to use only the specified accessories and
parts for installation, failure to use may lead to
electric shock, leakage or fire.

* Carry out installation with consideration of strong
winds, typhoons, or earthquakes. Improper
installation work may result in accidents due to
fall of equipment.

* If the unit is to be moved to other place, please
consult dealer first.

* Make sure wiring is carried out by qualified
personnel according to laws and regulations and
this manual, using a separate 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) Please do not cut or change the method of use of the yellow / green grounding
wire of the air-conditioner. Otherwise, it may cause the electrical leakage.

3) Grounding resistance should be approved by Country Standard GB17790.

Water supply Gas supply
Sewage tube Some places there are not reliable by a professional.

Grounding Requirement

Water pipe

Some parts of the water pipe are made of plastic
materials and not suitable for grounding.

Gas pipe

If there is electrical leakage accidently from air
conditioner, it can be a fire or explosion risk.

1) Air conditioner is a class I appliance. Must use a suitable grounding connection.

4) User power should provide a reliable grounding terminal. Please do not let the
grounding wire connect to the following places.

* Select a unit placement that will not disturb
neighbors with hot air or noise.

1) Mounting Indoor & Outdoor
Units and Running
Piping/Wiring

Ruler (Not Shown)
Stud-Finder
Dry-Wall Saw
Electric Drill
3" Hole Saw
Drill Extension
Hammer Drill and Bit (Not Shown)
Measuring Tape
Level
Flash Light
Screw Driver (Phillps and Flat)
Hammer
Knife
Scissors
Goggled Glass
Mask
Gloves
Ladder

2) Refrigeration Related Work

3) Electrical Related Installation

Flat Surface Wrench (Two)
Flare-Nut Tool Set (Not Shown)
Hex Head Key Set
Torch for AC Application (Not Shown)
Heat Absorbtion Flux
Nitrogen (Not Shown)
Soap Bubble (Not Shown)
Vacuum Pump
Helium Leakage Check (Not Shown)
Manifold

Wire Cutter
Wire Stripper
Sharp Plier
Cable Ties
Black Tape for Electrical Use
Electrical Meter

Clamp Meter (Not Shown)
Manifold
Infra Thermometer (Not Shown)

4) Trial Running Units and
Inspection

RECOMMENDED TOOLS FOR INSTALLATION