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1.  Disconnect all power to the furnace.  Do not touch the 

integrated control module or any wire connected to the 

control prior  to  discharging  your  body’s  electrostatic   

charge to ground.

2.  Firmly touch a clean, unpainted, metal surface of the 

furnaces near the control.  Any tools held in a  person’s 

hand during grounding will be discharged.

3.  Service  integrated  control  module  or  connecting 

wiring following the discharge process in step 2.  Use 

caution not to recharge your body with static electricity; 

(i.e., do not move or shuffle your feet, do not touch 

ungrounded objects, etc.).  If you come in contact with 

an ungrounded object, repeat step 2 before touching 

control or wires.

4.  Discharge your body to ground before removing a new 

control from its container.  Follow steps 1 through 3 if 

installing the control on a furnace.  Return any old or 

new controls to their containers before touching any 

ungrounded object.

To The Installer

Before installing this unit, please read this manual thoroughly to 

familiarize yourself with specific items which must be adhered to, 

including but not limited to: unit maximum external static pressure, 

gas pressures, BTU input rating, proper electrical connections, 

circulating air temperature rise, minimum or maximum CFM, and 

motor speed connections.

T

O

 

PREVENT

 

PROPERTY

 

DAMAGE

PERSONAL

 

INJURY

 

OR

 

DEATH

 

DUE

 

TO

 

FIRE

DO

 

NOT

 

INSTALL

 

THIS

 

FURNACE

 

IN

 

A

 

MOBILE

 

HOME

TRAILER

OR

 

RECREATIONAL

 

VEHICLE

.

WARNING

Product Application

This furnace is primarily designed for residential home-heating 

applications.  It is 

NOT 

designed or certified for use in mobile 

homes, trailers or recreational vehicles.  Neither is it designed 

or certified for outdoor applications.  The furnace 

must 

be 

installed indoors (i.e., attic space, crawl space, or garage area 

provided the garage area is enclosed with an operating door).
This  furnace  can  be  used  in  the  following  non-industrial 

commercial applications:
Schools, Office buildings, Churches, Retail stores, Nursing 

homes, Hotels/motels, Common or office areas.  
In such applications, the furnace must be installed with the fol

-

lowing stipulations:

• 

It must be installed per the installation instructions 

provided and per local and national codes.

• 

It must be installed indoors in a building constructed on 

site.

• 

It must be part of a ducted system and not used in a 

free air delivery application.

• 

It must not be used as a “make-up” air unit.

• 

It  must  be  installed  as  a  two-pipe  systems  for 

combustion air.

• 

All other warranty exclusions and restrictions apply 

This furnace is an ETL certified appliance  and is 

appropriate for use with natural gas.

Dual certification means that the combustion air inlet pipe is 

optional and the furnace can be vented as a:

• 

Non-direct vent (single pipe) central forced air furnace in 

which combustion air is taken from the installation area 

or from air ducted from the outside or,

• 

Direct  vent  (dual  pipe)  central  forced  air  furnace   

in which all combustion air supplied directly to the 

furnace burners through a special air intake system 

outlined in these instructions.

This furnace cannot be used as a construction site heater.

To ensure proper furnace operation, install, operate and 

maintain the furnace in accordance with these installation 

and operation instructions, all local building codes and 

ordinances.

  In their absence, follow the latest edition of the 

National Fuel Gas Code (NFPA 54/ANSI Z223.1), Installa

-

tion Codes, local plumbing or waste water codes, and other 

applicable codes.

A copy of the National Fuel Gas Code (NFPA 54/ANSI Z223.1) 

can be obtained from any of the following:

American National Standards Institute

23 West 43rd Street, 4th Floor

New York, NY 10036

 

National Fire Protection Association

 

1 Batterymarch Park

Quincy, MA  02169-7471

CSA International

8501 East Pleasant Valley

Independence, OH 441311

The rated heating capacity of the furnace should be greater than 

or equal to the total heat loss of the area to be heated.  The total 

heat loss should be calculated by an approved method or in ac

-

cordance with “ASHRAE Guide” or “Manual J-Load Calculations” 

published by the Air Conditioning Contractors of America.

Location Requirements & Considerations

Follow the instructions listed below and the guidelines provided 

in the 

Combustion and Ventilation Air Requirements 

section 

when selecting a furnace location.

T

O

 

PREVENT

 

POSSIBLE

 

EQUIPMENT

 

DAMAGE

PROPERTY

 

DAMAGE

PERSONAL

 

INJURY

 

OR

 

DEATH

THE

 

FOLLOWING

 

BULLET

 

POINTS

 

MUST

 

BE

 

OBSERVED

 

WHEN

 

INSTALLING

 

THIS

 

UNIT

.

WARNING

Summary of Contents for MES96 U Series

Page 1: ...R SERVICE PROCEDURES IF YOU SERVICE THIS UNIT YOU ASSUME RESPONSIBILITY FOR ANY INJURY OR PROPERTY DAMAGE WHICH MAY RESULT IN ADDITION IN JURISDICTIONS THAT REQUIRE ONE OR MORE LICENSES TO SERVICE THE...

Page 2: ...Air Opening Upflow Models 24 Filters Read This Section Before Installing The Return Air Duct work 24 Upright Installations 25 Horizontal Installations 25 Drain Trap Priming 25 Furnace Operation 25 Ga...

Page 3: ...me trap at time of installation may have a negative effect on combustion quality and pressure switch action WARNING FIRE OR EXPLOSION HAZARD Failue to follow safety warnings exactly could re sult in s...

Page 4: ...d other discounts or reductions Copy of the inspection report issued by carrier s representative at the time damage is reported to carrier Electrostatic Discharge ESD Precautions NOTE Discharge your b...

Page 5: ...n instructions provided and per local and national codes It must be installed indoors in a building constructed on site It must be part of a ducted system and not used in a free air delivery applicati...

Page 6: ...eater POSSIBLE PROPERTY DAMAGE PERSONAL INJURY OR DEATH DUE TO FIRE EXPLOSION SMOKE SOOT CONDENSATION ELECTRICAL SHOCK OR CARBON MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION REPAIR OPERATION OR MAIN...

Page 7: ...Seal any unused openings in the venting system 2 Inspect the venting system for proper size and horizon tal pitch as required by the National Fuel Gas Code ANSI Z223 1 instructions Determine that ther...

Page 8: ...ization can cause back drafting or improper combustion of gas fired appliances thereby exposing building occupantstogascombustionproductsthatcouldincludecarbon monoxide If this furnace is to be instal...

Page 9: ...en marche alors que tous les autres appareils raccord s au syst me de ventila tion ne sont pas en marche 1 Sceller toutes les ouvertures inutilis es du syst me de ventilation 2 Inspecter le syst me d...

Page 10: ...onally the appropriate downward piping slope must be maintained from the drain trap to the drain location Refer to Condensate Drain Trap and Lines for further details If the drain trap and drain line...

Page 11: ...A masonry chimney may be used as a chase or passage way for approved venting materials providing the masonry chimney is not also being used to vent products of combustion Never common vent this appli...

Page 12: ...Lengths shown in table 3 apply to single pipe two pipe installations In a two pipe installation do not add intake and vent pipe lengths together Both pipes would normally be equal in length if differ...

Page 13: ...ng the horizontal alternate vent configuration you must use the RF000142 vent drain kit See Figures 10 11 follow steps below NOTE In the horizontal left installation position a means of condensate col...

Page 14: ...rect vent application must terminate at least 12 from any opening through which flue gases may enter a building door window or gravity air inlet The vent termination of vent pipe run vertically throug...

Page 15: ...HEIGHT DIFFERENCE 12 MIN TO ROOF OR HIGHEST ANTICIPATED SNOW LEVEL Figure 14 Vertical Termination STRAIGHT ELBOWS Figure 15 VENT FLUE TEE or 45 ELBOW TURNED DOWN or 90 ELBOW TURNED DOWN OPTIONAL 12 M...

Page 16: ...swiththeexhaustventandairintaketerminations of a single unit If more than one direct vent furnace is to be installed horizontally through a common side wall maintain the clearances as in the following...

Page 17: ...Drain Trap A condensing gas furnace achieves its high level of efficiency by extractingheatfromtheproductsofcombustiontothepointwhere condensation takes place The condensate must be collected in the f...

Page 18: ...barbed end goes in the cabinet through the hole in the left side of the cabinet and secure with two field supplied 8 self tapping screws see Figure 24 2 Locate the long drain hose 3 and cut at B line...

Page 19: ...rip leg port must be sealed to prevent flue gases from escaping Insert the rubber plug removed in step 6 into the unused elbow drain port Inserting a blunt tool such as a 3 16 Allen wrench into the ce...

Page 20: ...ctrical circuit containing prop erly sized wire and fuse or circuit breaker The fuse or circuit breaker must be sized in accordance with the maximum overcurrent protection specified on the unit rating...

Page 21: ...ERSONAL INJURY OR DEATH MAY OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED THE APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER FURNACE OPERATION ALL CONVERSIONS MUST BE PERFORMED BY...

Page 22: ...rning The orientation of the gas valve on the manifold must be maintained as shipped from the factory Maximum torque for the gas valve connection is 375 in lbs excessive over tightening may damage the...

Page 23: ...ressures in excess of psig 3 48 kPa Isolate this unit from the gas supply piping system by closing its external manual gas shutoff valve before pressure testing supply piping system with test pressure...

Page 24: ...e cor ners of the opening cut the sheet metal along the scribe lines to free the duct flanges Using the scribe line along the duct flange as a guide unfold the duct flanges around the perimeter of the...

Page 25: ...MUST BE AS SPECIFIED ON THE UNIT RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES OPERATING Furnace Startup 1 Closethemanualgasshutoffvalveexternaltothefurnace 2 Turn off the electrical powe...

Page 26: ...ure regulator gas piping size etc and or consult with local gas utility 5 Turn OFF gas to furnace at the manual shutoff valve and disconnect manometer Reinstall plug and tighten as needed before turni...

Page 27: ...essure cannot vary by more than 0 2 w c for Natural gas from the specified setting Consult your local gas supplier if additional input rate adjustment is required 4 Turn ON gas to and relight all othe...

Page 28: ...ule performs internal checks LED will flash once at power up then remain on Integrated control module monitors safety circuits continuously Furnace awaits call from thermostat Heating Mode The normal...

Page 29: ...osed electrically auto reset sensor This switch guards against the burner flames not being properly drawn into the heat exchanger Pressure Switches The pressure switches are normally open closed durin...

Page 30: ...ol will return to lockout Refer to the Troubleshooting Chart for aid in determining the cause Field Test Mode Function When the SW1 button is pressed and held until the LED is blinking in AMBER more t...

Page 31: ...ly Annually inspect the drain tubes drain trap and field sup plied drain line for proper condensate drainage Check drain system for hose connection tightness blockage and leaks Clean or repair as nece...

Page 32: ...Open RED When an open limit is detected the control energizes the blower at cooling speed and the inducer at the RUN setting no CFH required Once the limit closes and the CFH is present the furnace r...

Page 33: ...Press and hold the SW1 button for more than 5 seconds results in the display of this mode Releasing the Button during this indication will cause the Error History to be cleared The button must be rel...

Page 34: ...CFM Rise CFM CFM CFM Red High Cool 3 1350 NA 1310 NA 1273 NA 1234 NA 1198 NA 1156 1117 1078 Blue Med Hi Heat 2 5 1247 29 1212 30 1167 31 1129 32 1087 33 1043 997 952 Brown Med Low 2 1151 31 1107 32 1...

Page 35: ...ore servicing or installing this unit Multiple power sources may be present Failure to do so may cause property damage personal injury or death Wiring is subject to change Always refer to the wiring d...

Page 36: ...a relatively short process and entitles you to additional warranty protection except that failure by California and Quebec residents to register their product does not diminsh their warranty rights Fo...

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