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20

drain hole.

6.  Insert 100° elbow in the cut end of hose #5.

7.  Locate hose #6. Using red clamps, connect between 

the coupling and 100° elbow, cutting off excess tubing.

8.      Draining  the  Collector  Box:  Remove  cap  from  left 

side collector box drain port (bottom in horizontal left 

position) and install it on right side (top) collector box 

drain port and secure with a red clamp. 

9.   Install the non-grommet end of hose #11 from outside 

the cabinet in the upper drain hole. Install on collector 

box and secure with a silver clamp.

10. Use two silver clamps and secure the hoses to drain 

trap. The  trap  outlet  faces  the  front  of  the  furnace. 

Secure the trap to the cabinet using two screws 

removed in step 2 by inserting the two screws through 

the large set of holes in the top mounting tabs of the 

trap.

Electrical Connections

E

DGES

 

OF

 

SHEET

 

METAL

 

HOLES

 

MAY

 

BE

 

SHARP

.  U

SE

 

GLOVES

 

AS

 

A

 

PRECAUTION

 

WHEN

 

REMOVING

 

HOLE

 

PLUGS

.

WARNING

T

O

 

PREVENT

 

PERSONAL

 

INJURY

 

OR

 

DEATH

 

DUE

 

TO

 

ELECTRIC

 

SHOCK

DISCONNECT

 

ELECTRICAL

 

POWER

 

BEFORE

 

INSTALLING

 

OR

 

SERVICING

 

THIS

 

UNIT

.

WARNING

HIGH VOLTAGE !

T

O

 

AVOID

 

THE

 

RISK

 

OF

 

INJURY

ELECTRICAL

 

SHOCK

 

OR

 

DEATH

THE

 

FURNACE

 

MUST

 

BE

 

ELECTRICALLY

 

GROUNDED

 

IN

 

ACCORDANCE

 

WITH

 

LOCAL

 

CODES

 

OR

 

IN

 

THEIR

 

ABSENCE

WITH

 

THE

 

LATEST

 

EDITION

 

OF

 

THE

 

N

ATIONAL

 E

LECTRIC

 C

ODE

.

WARNING

Wiring Harness

The wiring harness is an integral part of this furnace.   Wires 

are color coded for identification purposes.  Refer to the wiring 

diagram for wire routings.  If any of the original wire as supplied 

with the furnace must be replaced, it must be replaced with 

wiring material having a temperature rating of at least 105°C.  

Any replacement wiring must be a copper conductor. 

115 Volt Line Connections

Before proceeding with electrical connections, ensure that 

the  supply  voltage,  frequency,  and  phase  correspond  to 

that specified on the unit rating plate.  Power supply to the 

furnace must be NEC Class 1, and must comply with all ap

-

plicable codes.  The furnace must be electrically grounded 

in accordance with local codes or, in their absence, with the 

latest edition of The National Electric Code, ANSI NFPA 70 .
Use a separate fused branch electrical 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 plate.  An 

electrical disconnect must be provided at the furnace location.
Connect hot, neutral, and ground wires as shown in the wiring 

diagram located on the unit’s blower door.  For direct vent 

applications, the cabinet opening to the junction box must be 

sealed air tight using either an UL approved bushing such as 

Heyco Liquid Tight or by applying non-reactive UL approved 

sealant to bushing.
Line polarity must be observed when making field connec

-

tions.  Line voltage connections can be made through either 

the right or left side panel.  The furnace is shipped configured 

for a right side electrical connection with the junction box 

located  inside  the  burner  compartment.   To  make  electri

-

cal connections through the opposite side of the furnace, 

the junction box must be relocated to the other side of the 

burner compartment prior to making electrical connections.  

To relocate the junction box, follow the steps shown below.

NOTE:

 Wire routing must not to interfere with circulator blow

-

er operation, filter removal, or routine maintenance. 

Junction Box Relocation

HIGH VOLTAGE !

T

O

 

AVOID

 

PERSONAL

 

INJURY

 

OR

 

DEATH

 

DUE

 

TO

 

ELECTRICAL

 

SHOCK

DISCONNECT

 

ELECTRICAL

 

POWER

 

BEFORE

 

SERVICING

 

OR

 

CHANGING

 

ANY

 

ELECTRICAL

 

WIRING

.

WARNING

HIGH VOLTAGE !

T

O

 

AVOID

 

THE

 

RISK

 

OF

 

ELECTRICAL

 

SHOCK

WIRING

 

TO

 

THE

 

UNIT

 

MUST

 

BE

 

POLARIZED

 

AND

 

GROUNDED

.

WARNING

L

ABEL

 

ALL

 

WIRES

 

PRIOR

 

TO

 

DISCONNECTION

 

WHEN

 

SERVICING

 

CONTROLS

. W

IRING

 

ERRORS

 

CAN

 

CAUSE

 

IMPROPER

 

AND

 

DANGEROUS

 

OPERATION

. V

ERIFY

 

PROPER

 

OPERATION

 

AFTER

 

SERVICING

.

CAUTION

Line voltage connections can be made through either the 

right or left side panel. The furnace is shipped configured 

for a left side electrical connection. To make electrical 

connections through the opposite side of the furnace, the 

junction box must be relocated to the right side prior to 

making electrical connections. To relocate the junction box, 

perform the following steps.

1.  Remove the burner compartment door.

2.  Remove and save the two screws securing the junction 

box to the side panel.

3.  Relocate  junction  box  and  associated  plugs  and 

grommets to opposite side panel.  Secure with screws 

removed in step 2.

 

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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