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Page 22

TABLE 11 

OUTDOOR TERMINATION USAGE*

Input Size

Vent Pipe 

Dia. in.

STANDARD

CONCENTRIC

Flush 

Mount Kit

Wall Kit

Field

 

Fabricated

1-1.2 inch

2 inch

3 inch

2 inch

3 inch

71M80 

(US) 

4

44W92 

(CA)

69M29 

(US) 

4

44W92 

(CA)

60L46 (US) 

4

44W93 

(CA)

51W11 

(US)

 

51W12

 

(CA)

22G44 

(US) 

4

30G28 

(CA)

44J40 (US) 

4

81J20 

(CA)

030,

 

045

6

1-1.2

3

YES

YES

1

YES

5

YES

2

YES

2

3

YES

YES

1

YES

5

YES

2

YES

2-1/2

3

YES

YES

1

YES

5

YES

2

YES

3

3

YES

YES

1

YES

5

YES

2

YES

070

6

1-1/2

3

YES

YES

1

YES

5

YES

2

YES

2

3

YES

YES

1

YES

5

YES

2

YES

2-1/2

3

YES

YES

1

YES

5

YES

2

YES

3

3

YES

YES

1

YES

5

YES

2

YES

090

2

3

YES

YES

5

YES

YES

YES

2-1/2

3

YES

YES

5

YES

YES

YES

3

3

YES

YES

5

YES

YES

YES

110

2

YES

YES

5

YES

YES

YES

2-1/2

YES

YES

5

YES

YES

YES

3

YES

YES

5

YES

YES

YES

NOTE - Standard Terminations do not include any vent pipe or elbows external to the structure. Any vent pipe or elbows external to the structure must be included in total 

vent length calculations. See vent length tables.
* Kits must be properly installed according to kit instructions.
1Requires field-provided outdoor 1-1/2” exhaust accelerator.
2Concentric kits 71M80 and 44W92 include 1-1/2” outdoor accelerator, when uses with 030, 045 and 070 input models. When using 1-1/2 inch vent pipe, transistion to 2” 

pipe before installing concentric kit.
3 Flush mount kits 51W11 and 51W12 includes 1-1/2 in. outdoor exhaust accelerator, required when used with 030, 045, 070 and 090 input models. When using 1-1/2” 

vent pipe, transition to 2” pipe before installing flushmount kit.  
4 Termination kits 30G28, 44W92, 4493 and 81J20 are certified to ULC S636 for use in Canada only.
5 See table 8 for vent accelerator requirements.
6 Requires field provided 2” to 1-1/2” reducer.

Joint Cementing Procedure

All cementing of joints should be done according to the 

specifications outlined in ASTM D 2855.

 DANGER

DANGER OF EXPLOSION!

Fumes from PVC glue may ignite during system check. 

Allow fumes to dissipate for at least 5 minutes before 

placing unit into operation..

1 - 

Measure and cut vent pipe to desired length.

2 - 

  Debur  and  chamfer  end  of  pipe,  removing  any 

ridges  or  rough  edges.  If  end  is  not  chamfered, 

edge of pipe may remove cement from fitting socket 

and result in a leaking joint.

NOTE - 

Check the inside of vent pipe thoroughly for 

any obstruction that may alter furnace operation.

3 - 

 Clean and dry surfaces to be joined.

4 -   Test fit joint and mark depth of fitting on outside of 

pipe.

5 -    Uniformly  apply  a  liberal  coat  of  PVC  primer  for 

PVC or use a clean dry cloth for ABS to clean inside 

socket  surface  of  fitting  and  male  end  of  pipe  to 

depth of fitting socket.

NOTE - 

Time is critical at this stage. Do not allow 

primer to dry before applying cement.

6 -    Promptly apply solvent cement to end of pipe and 

inside socket surface of fitting. Cement should be 

applied lightly but uniformly to inside of socket. Take 

care  to  keep  excess  cement  out  of  socket. Apply 

second coat to end of pipe.

7 -    Immediately  after  applying  last  coat  of  cement  to 

pipe, and while both inside socket surface and end 

of pipe are wet with cement, forcefully insert end of 

pipe into socket until it bottoms out. Turn PVC pipe 

1/4 turn during assembly (but not after pipe is fully 

inserted) to distribute cement evenly. DO NOT turn 

ABS or cellular core pipe

Summary of Contents for 20256877

Page 1: ...version to LPG operation All ML193U HE units are equipped with a hot surface ignition system The gas valve is redundant to assure safety shut off as required by C S A The heat exchanger burners and ma...

Page 2: ...provided 1 Annual Fuel Utilization Efficiency based on DOE test procedures and according to FTC labeling regulations Isolated combustion system rating for non weatherized furnaces SPECIFICATIONS Gas H...

Page 3: ...f filter in 87L96 18 x 25 x 1 87L97 20 x 25 x 1 Side Return Single 44J22 44J22 Ten Pack 66K63 66K63 Size of filter in 16 x 25 x 1 16 x 25 x 1 NIGHT SERVICE KIT Night Service Kit 84W48 84W48 TERMINATIO...

Page 4: ...5 147 455 100 0 70 1210 401 1080 316 930 247 635 152 405 109 0 80 1185 412 1045 325 885 255 600 158 355 114 ML193UH030XE36B PERFORMANCE Less Filter External Static Pressure in w g Air Volume Watts at...

Page 5: ...15 1635 521 1485 425 1345 359 1140 271 1900 698 1635 506 1450 413 1330 351 1125 270 0 80 1855 735 1600 534 1440 426 1305 367 1085 279 1850 711 1605 520 1415 430 1285 363 1075 281 ML193UH090XE48C PERFO...

Page 6: ...EMBLY CONTROL BOX former circuit breaker and interlock switch COMBUSTION AIR INDUCER BURNER ACCESS PANEL COMBUSTION AIR PRESSURE SWITCH PRIMARY LIMIT GAS VALVE BLOWER ASSEMBLY FLEXIBLE NO HUB EXHAUST...

Page 7: ...m er T1 The breaker is rated at 3A at 32V If the current exceeds this limit the breaker will trip and all unit opera tion will shutdown The breaker can be manually reset by pressing the button on the...

Page 8: ...sor 5 Watchguard burner failed to light exceeded maximum number of retries or recycles 6 Not Used 7 Primary or Secondary Limit Open or Watchguard Mode Limit Switch Open longer than 3 minutes 8 Rollout...

Page 9: ...es into Watchguard Flame Failure mode After a 60 minute reset period the integrat ed control will begin the ignition sequence again Fan Time Control Ignition Control 103217 03 Heating Fan On Time The...

Page 10: ...rtbeat is indicated by 1s on 1s off It is used for idle continuous fan and cool modes Note 2 Error codes are indicated by a rapid flash the LED flashes X times at second on second off remains off for...

Page 11: ...3UHE units use an aluminized steel primary and stainless steel secondary heat exchanger assembly Heat is transferred to the air stream from all surfaces of the heat exchanger The shape of the heat exc...

Page 12: ...hrough the flame and sensing electrode The ig nition control allows the gas valve to remain open as long as flame signal is sensed NOTE The ML193UHE is polarity sensitive Make sure that the furnace is...

Page 13: ...icroAmps Multi Meter To Control Sensor Terminal To Flame Terminal Flame Sensor Terminal Flame Sensor Wire Intergrated Control Remove sensor from integrated control and connect alligator clip to flame...

Page 14: ...resistance of ignitor at the plug Reading should be between 39 and 70 ohms If the reading is correct then the problem is with the wiring between the jack plug and the control If reading is not correct...

Page 15: ...nitors across the combustion air inducer orifice to insure proper flow through the heat exchanger The switch is a SPST N O pressure switch electrically connected to the integrated control The purpose...

Page 16: ...d end header box are negative How sure than the port 4 Operate unit and observe manometer reading Readings will change as heat exchanger warms a Take one reading immediately after start up b Take a se...

Page 17: ...fferential pressure across the pressure switch Check for restricted inlet vent Remove all block age Check for proper vent sizing and run length Wrong pressure switch installed in the unit or pressure...

Page 18: ...rect voltage is present in tests 1 and 2 and motor is not operating properly replace motor The motor is not field repairable If replacing the indoor blower motor or blower wheel is necessary placement...

Page 19: ...peed tap used for continuous fan 1 2 3 4 or 5 on input plug P49 If 24 volts is not present problem may be up stream of plug P49 Proceed to test 4 Multi Meter set to VAC 12 0 12 0 24 Multi Meter set to...

Page 20: ...ximately the same resistance within an ohm 3 Check to see if the blower wheel spins freely Motor Test FIGURE 19 TABLE 9 Scale Measurement range in words ohms 2 M two megohm two million ohms 0 2 000 00...

Page 21: ...YSTEM PolyPro by Duravent InnoFlue by Centrotherm UL 1738 CERTIFIED GAS VENTING SYSTEM IPEX System1738 Schedule 40 PVC Pipes and Fittings UL1738 IPEX System1738 PVC FGV Cement Primer Not approved as o...

Page 22: ...s 30G28 44W92 4493 and 81J20 are certified to ULC S636 for use in Canada only 5 See table 8 for vent accelerator requirements 6 Requires field provided 2 to 1 1 2 reducer Joint Cementing Procedure All...

Page 23: ...existing vent pipe for that gas appliance must be checked Without the heat of the original furnace flue products the existing vent pipe is probably oversized for the single water heater or other appli...

Page 24: ...e the pipe is transitioned to any size larger than 2 This elbow must be added to the elbow count used to determine acceptable vent lengths Contact the Application Department for more information conce...

Page 25: ...090 110 030 045 070 090 110 1 20 15 n a n a 73 58 42 22 105 90 64 39 121 121 114 114 2 15 10 68 53 37 17 100 85 59 34 116 116 109 109 3 10 n a 63 48 32 12 95 80 54 29 111 111 104 104 4 n a 58 43 27 n...

Page 26: ...r pipe in horizontal runs of exhaust pipe Exhaust 6 Min FIGURE 25 SIDE VIEW 2 2 2 or TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON DIRECT VENT APPLICATIONS RIGHT HAND DISCHAR...

Page 27: ...TAKE PIPE CONNECTIONS HORIZONTAL NON DIRECT VENT APPLICATIONS Horizontal Right Hand Air Discharge Application Shown INTAKE DEBRIS SCREEN Provided OR NOTE Debris screen may be positioned straight out p...

Page 28: ...s and the flue gases are discharged to the out doors The ML193UHE is then classified as a direct vent Category IV gas furnace In both Non Direct Vent and Direct Vent applications the vent termination...

Page 29: ...N A 2 in 5 3 12 10 22 19 30 27 2 1 2 in 1 N A 7 N A 15 N A 22 N A 3 in N A N A 2 2 10 10 16 16 1 Refer to 99 Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals...

Page 30: ...al to or greater than soffit depth 3 feet 9m 12 3 feet 9m within a height 15 feet 4 5m above the meter regulator assembly 3 feet 9m 6 inches 152mm for appliances 10 000 Btuh 3kw 12 inches 305mm for ap...

Page 31: ...feet 4 5m above the meter regulator assembly 3 feet 9m 6 inches 152mm for appliances 10 000 pliances 10 000 Btuh 3kw and 50 000 pliances 50 000 Btuh 15kw 6 inches 152mm for appliances 10 000 Btuh 3kw...

Page 32: ...6 152mm on side wall terminations NOTE When venting in different pressure zones the maximum separation requirement of intake and exhaust pipe DOES NOT apply 3 On roof terminations the intake piping s...

Page 33: ...NATION 71M80 69M29 or 60L46 US 44W92 or 44W93 Canada INTAKE AIR EXHAUST AIR INTAKE AIR INTAKE AIR EXHAUST AIR OUTSIDE WALL GRADE CLAMP Not Furnished FIELD PROVIDED REDUCER MAY BE REQUIRED TO ADAPT DIF...

Page 34: ...ective shield is recommended The shield should be constructed using wood sheet metal or other suitable material All seams joints cracks etc in affected area should be sealed using an appropriate seala...

Page 35: ...n exhaust pipe terminations on multiple furnaces must meet local codes NON DIRECT VENT ROOF TERMINATION KIT 15F75 or 44J41 UNCONDITIONED ATTIC SPACE 3 76mm OR 2 51mm PVC PROVIDE SUPPORT FOR EXHAUST LI...

Page 36: ...ator coil can drain together See FIGURE 49 FIGURE 51 and FIGURE 52 CONDENSATE TRAP AND PLUG LOCATIONS Unit shown in upflow position NOTE In upflow applications where side return sate trap filter rack...

Page 37: ...st slope down a minimum 1 4 per ft toward trap FIGURE 47 Furnace With Evaporator Coil Using A Separate Drain Condensate DrainConnection Field Provided Vent 1 min 2 max above condensate connection Evap...

Page 38: ...in connection Condensate DrainConnection Evaporator drain line required Trap at coil is optional FIGURE 51 IMPORTANT When combining the furnace and evaporator coil drains together the A C condensate d...

Page 39: ...ction In Unit Condensate Drain Connection In Unit Vent To Drain Condensate Drain Connection In Unit Optional Condensate Drain Connection OptionalDrainPipingFromTrap DrainTrapAssembly Furnished DrainTr...

Page 40: ...p should be primed with sufficien water to ensure proper condensate drain operation WARNING If you do not follow these instructions exactly a fire or explosion may result causing property damage perso...

Page 41: ...rgents can cause harmful corrosion on various metals used in gas piping Use of a specialty Gas Leak Detector is strongly recommended It is available through Lennox under part number 31B2001 See Corp 8...

Page 42: ...or steady state conditions 4 After allowing unit to stabilize for 5 minutes record manifold pressure and compare to value given in table 19 5 Shut unit off and remove manometer as soon as an accurate...

Page 43: ...it Refer to the changeover kit installation instruction for the conversion procedure TABLE 19 Manifold and Supply Line Pressure 0 10 000ft ML193 Unit Gas Manifold Pressure in wg Supply Line Pressure i...

Page 44: ...s a function of load indicates a poor or partial ground Compare the readings to the table below If the readings exceed the maximum shown in TABLE 21 make repairs before operating the furnace 2 In addi...

Page 45: ...urn air plenums Insert manometer hose flush with inside edge of hole or insulation Seal around the hose with permagum Connect the zero end of the manometer to the discharge supply side of the system O...

Page 46: ...appropriate Lennox Product Specifications bulletin Additional information is provided in Service and Application Note ACC002 August 2000 TABLE 22 Furnace Cabinet Width Filter Size Side Return Bottom...

Page 47: ...compartment components Disengage strain relief bushing and pull wiring and bushing through the hole in the blower deck 18 Remove the primary limit from the vestibule panel 19 Remove top cap screws to...

Page 48: ...plug 5 Disconnect and label wires from rollout switch 6 Disconnect and label flame sensor wire 7 Disconnect and label ground wire from burner manifold assembly 8 Remove four screws that secures burner...

Page 49: ...ontrol goes into 5 minute Watchguard Pressure Switch delay Once S18 closes a 15 second pre purge follows 4 The integrated control A92 energizes ignitor A 20 second warm up period begins 5 Gas valve op...

Page 50: ...ALVE ENERGIZED GAS VALVE OFF COMBUSTION AIR INDUCER ON INDOOR BLOWER ON HEATING SPEED LED FLASHES CODE 11 PRESSURE SWITCH CLOSED GAS VALVE OFF COMBUSTION AIR INDUCER OFF INDOOR BLOWER OFF WITH DELAY S...

Page 51: ...RESET IGNITION SEQUENCE FOUR TIMES FLAME SIGNAL 1 5 MICROAMPS OR GREATER YES YES YES ROLLOUT SWITCH CLOSED LED FLASHES CODE 8 ROLLOT SWITCH OPEN GAS VALVE POWER OFF COMBUSTION AIR INDUCER POWER ON IND...

Page 52: ...ITCH CLOSED LED SLOW FLASH RATE REMAINS UNCHANGED THROUGHOUT COOLING CYCLE THERMOSTAT CALLS FOR COOLING COMPRESSOR CONTACTOR AND SYSTEM FAN ENERGIZED WITH 2 SECOND DELAY COOLING SPEED EAC TERM ENERGIZ...

Page 53: ...AN SWITCHED TO COOL SPEED EAC TERM REMAINS ON THERMOSTAT OPENS MANUAL FAN SELECTION MADE AT THERMOSTAT CONTROL G ENERGIZES SYSTEM FAN AT FAN SPEED EAC TERM ENERGIZED NO YES YES NO SYSTEM FAN SWITCHES...

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