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Lennox ML193UH Installation Instructions Manual

Meritseriies gas furnace up/flow horizontal air discharge
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See also: User's Information Manual , Instruction Manual
Enlarged version
© 2018 Lennox Industries Inc.
Dallas, Texas USA
HORIZONTAL LEFT
Contents
Unit Dimensions - inches (mm) ......................................2
ML193UH Gas Furnace..................................................3
Shipping and Packing List ..............................................3
Safety Information ..........................................................3
Use of Furnace as Construction Heater .........................4
General ...........................................................................5
Combustion, Dilution & Ventilation Air ............................5
Shipping Bolt Removal ...................................................8
Installation - Setting Equipment ......................................8
Filters ............................................................................13
Duct System .................................................................13
Pipe Fittings Specifications...........................................13
Joint Cementing Procedure ..........................................15
Venting Practices ..........................................................16
AIR FLOW
UPFLOW
HORIZONTAL RIGHT
INSTALLATION
INSTRUCTIONS
ML193UH
MERIT
SERIIES GAS FURNACE
®
UP/FLOW HORIZONTAL AIR DISCHARGE
507278-04
02/2018
Supersedes 11/2017
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
This is a safety alert symbol and should never be
ignored. When you see this symbol on labels or in man-
uals, be alert to the potential for personal injury or death.
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
Vent Piping Guidlines ...................................................16
Gas Piping ....................................................................33
Electrical .......................................................................36
Ignition Control .............................................................39
Unit Start-Up .................................................................40
Gas Pressure Adjustment .............................................41
Proper Cumbustion.......................................................42
High Altitude Information ..............................................42
Other Unit Adjustments.................................................44
Twinning the ML193UH ................................................45
Service..........................................................................46
Repair Parts List ...........................................................47
Start-Up & Performance Check List .............................48
Page 1
CAUTION
WARNING
43

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Summary of Contents for Lennox ML193UH

  • Page 1: Table Of Contents

    INSTALLATION INSTRUCTIONS ML193UH © 2018 Lennox Industries Inc. Dallas, Texas USA MERIT SERIIES GAS FURNACE ® UP/FLOW HORIZONTAL AIR DISCHARGE 507278-04 02/2018 Supersedes 11/2017 THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE This is a safety alert symbol and should never be ignored.

  • Page 2: Unit Dimensions - Inches (Mm)

    3-1/4 23-1/2 (83) (19) (19) (597) Bottom Return Bottom Return Air Opening Air Opening FRONT VIEW SIDE VIEW ML193UH Model in (mm) in (mm) in (mm) in (mm) 045XP24B 045XP36B 17-1/2 (446) 16-3/8 (416) 16 (406) 7-5/8 (194) 070XP24B 070XP36B...

  • Page 3: Ml193Uh Gas Furnace

    1 - Snap bushing The ML193UH can be installed as either a Direct Vent 1 - Snap plug or a Non-Direct Vent gas central furnace.

  • Page 4: Use Of Furnace As Construction Heater

    The following statement only applies to the US Lennox Installed in Combination with a Cooling Coil does not recommend the use of ML193UH units as a con- When this furnace is used with cooling coils (FIGURE 3), struction heater during any phase of construction. Very low...

  • Page 5: General

    Combustion, Dilution & Ventilation Air might blow directly into it. This could cause improp- If the ML193UH is installed as a Non-Direct Vent Fur- er combustion and unsafe operation. nace, follow the guidelines in this section.
  • Page 6 ML193UH furnaces to ensure efficient and doors, follow the procedures in the Air from Outside and safe operation. You must consider combustion air section.
  • Page 7 Air from Outside EQUIPMENT IN CONFINED SPACE If air from outside is brought in for combustion and ventila- (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside) tion, the confined space shall be provided with two perma- nent openings. One opening shall be within 12” (305mm) Roof Terminated of the top of the enclosure and one within 12”...

  • Page 8: Shipping Bolt Removal

    2,000 Btu (645mm per .59kW) per hour of the total The ML193UH gas furnace can be installed as shipped input rating of all equipment in the enclosure. If the equipment room in the upflow position. Refer FIGURE 12 for clearances.
  • Page 9 SETTING EQUIPMENT Unit must be level side-to-side. Unit may be positioned from level to 1/2” toward the front to aid in draining. UPFLOW APPLICATION UNIT FRONT UNIT FRONT AIR FLOW 1/2” max. SIDE VIEW SIDE VIEW FRONT VIEW HORIZONTAL APPLICATION UNIT FRONT 1/2”...
  • Page 10 Allow absolutely no sagging, cracks, gaps, etc. Refer to Engineering Handbook for additional information. ML193UH applications which include side return air For no reason should return and supply air duct systems and a condensate trap installed on the same side of...
  • Page 11 Optional Return Air Base CONDENSATE (Upflow Applications Only) TRAP FURNACE FRONT 23 (584) 3−1/4 IF BASE Overall (83) IS USED (Maximum) Minimum WITHOUT 11 (279) IAQ CABINET, Maximum INDOOR AIR 22−7/16 A SINGLE Unit side return air 14 (356) (570) QUALITY RETURN AIR Opening...
  • Page 12 NOTE - Heavy-gauge sheet metal straps may be used to The ML193UH furnace can be installed in horizontal appli- cations with either right- or left-hand air discharge. Refer suspend the unit from roof rafters or ceiling joists. When to FIGURE 17 for clearances in horizontal applications.

  • Page 13: Filters

    This specifications provided by the filter manufacturer against raw gas or toxic fumes might then be distributed through- the data given in the appropriate Lennox Product out the house by the furnace duct system. Specifications bulletin. Additional information is provided in Service and Application Note ACC002 (August 2000).
  • Page 14 ABS to PVC or CPVC Transition Solvent IMPORTANT D3188 Cement CANADA PIPE & FITTING & SOLVENT ML193UH exhaust and intake connections are made MARKING of PVC. Use PVC primer and solvent cement when CEMENT using PVC vent pipe. When using ABS vent pipe, use PVC &...

  • Page 15: Joint Cementing Procedure

    TABLE 3 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Wall Ring Wall Kit 1-1.2 inch 2 inch 3 inch Flush Mount Kit Vent Pipe 2 inch 3 inch 2 inch Input Size Field 71M80 69M29 Dia. in. 51W11 22G44 44J40 Fabricated (US) (US) 60L46 (US) (US)

  • Page 16: Venting Practices

    Vent Piping Guidlines condensate collection trap and lines. NOTE - Lennox has approved the use of DuraVent® and Exhaust Piping (FIGURE 24 and FIGURE 25) Centrotherm manufactured vent pipe and terminations as an option to PVC. When using the PolyPro® by Du- Route piping to outside of structure.
  • Page 17 The ML193UH can be installed as either a Non-Direct Use the following steps to correctly size vent pipe diam- Vent or a Direct Vent gas central furnace. eter. NOTE - In Non-Direct Vent installations, combustion air is taken from indoors and flue gases are discharged out- Piping Size Process doors.
  • Page 18 TABLE 5 Maximum Allowable Intake or Exhaust Vent Length in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.
  • Page 19 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS EXHAUST INTAKE EXHAUST INTAKE 2” 2” 2” 2” 3” 3” TRANSITION TRANSITION 2” 2” *2” *2” DO NOT transition from smaller to larger pipe in horizontal runs of exhaust pipe.
  • Page 20 Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS The ML193UH furnace may be installed in either direct HORIZONTAL NON−DIRECT VENT APPLICATIONS vent or non-direct vent applications. In non-direct vent ap- (Horizontal Right−Hand Air Discharge Application Shown) plications, when intake air will be drawn into the furnace...
  • Page 21 The ML193UH is then classified as a direct vent, of exhausted air as well as the maximum volume of Category IV gas furnace.
  • Page 22 TABLE 7 Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For Winter Design Temperatures Single - Stage High Efficiency Furnace Winter Design Unit Input Size Vent Pipe Temperatures1 °F Diameter (°C) 32 to 21 2 in (0 to -6) 2-1/2 in 3 in...

  • Page 23: Vent Termination Clearances

    ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 31...
  • Page 24 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 32 Page 24...
  • Page 25 (minimum 24 inches square) should be used to protect the wall surface. If the *ML193UH-045, -070 and -090 units with the flush mount termination must use optional tee is used, the protective shield is recommend- the 1-1/2” accelerator supplied with the kit unless a tee is used for termination ed.
  • Page 26 7 - If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported. At least one bracket must be used within 6” from the 12” EXHAUST top of the elbow and then every 24” (610mm) as (305mm) VENT 5-1/2”...
  • Page 27 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT LARGER VENT PIPE SIZE Vent Pipe Vent Pipe TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
  • Page 28 The termination pipe must be sized as listed Crawl Space and Extended Horizontal Venting in table 8.The specified pipe size ensures proper Lennox provides kit 51W18 (USA) and kit 15Z70 (Cana- velocity required to move the exhaust gases away from the building.
  • Page 29 Heating cable kit is sate trap, filter rack must be installed beyond available from Lennox in various lengths; 6 ft. (1.8m) - condensate trap or trap must be re-located to kit no. 26K68 and 24 ft. (7.3m) - kit no. 26K69.
  • Page 30 CONDENSATE TRAP LOCATIONS Condensate Trap With Optional Overflow Switch (Unit shown in upflow position with remote trap) From Evaporator Coil HorizontalFurnace4” Min. to 5” Max.above Field ProvidedVent condensatedrain connection) Min. 1” Above Condensate Drain Connection 1” Min. 2” Max. FurnaceCondensate DrainConnection *5’...
  • Page 31 Furnace with Evaporator Coil Using a Separate Drain (Unit shown in horizontal left-hand discharge position) Field Provided Vent Evaporator (4” min. to 5” max. above Coil condensate connection) 4”min 5”max 5’ max. PVC Pipe Only Condensate Drain Connection (Trap at coil is optional) Drain Pan Piping from furnace and evaporator coil must slope down a minimum 1/4”...
  • Page 32 TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC Optional Condensate Drain Connection Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) 90° Street Elbow 3/4 inch PVC (not furnished) Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) Condensate Drain Connection In Unit 1 (25 mm) Min.

  • Page 33: Gas Piping

    3 - Gas piping must not run in or through air ducts, Gas Piping clothes chutes, chimneys or gas vents, dumb waiters or elevator shafts. Center gas line through CAUTION piping hole. Gas line should not touch side of unit. See FIGURE 55 and FIGURE 56.
  • Page 34 WARNING FIRE OR EXPLOSION HAZARD Failure to follow the safety warnings exactly could result in serious injury, death, or property damage. Never use an open flame to test for gas leaks. Check all connections using a commercially available soap solution made specifically for leak detection.
  • Page 35 TABLE 9 Gas Pipe Capacity - ft3/hr (m3/hr) Nominal Internal Length of Pipe - feet (m) Iron Pipe Diameter Size Inches inches (3.048) (6.096) (9,144) (12,192) (15.240) (18.288) (21.336) (24.384) (27.432) (30,480) (mm) (mm) .622 (12.7) (17.799) (4.87) (3.34) (2.69) (2.29) (2.03) (1.84)

  • Page 36: Electrical

    Canadian Electric Code part 1 (CSA standard C22.1) for Canada. A green ground wire is provided in the field make-up box. NOTE - The ML193UH furnace contains electronic com- ponents that are polarity sensitive. Make sure that the fur- Right Side nace is wired correctly and is properly grounded.
  • Page 37 If an accessory rated at greater 2 - When the ML193UH is running in the heating mode, than one amp is connected to this terminal, it is necessary the indoor blower will run on the heating speed.
  • Page 38 TYPICAL ML193UH WIRING DIAGRAM FIGURE 58 Page 38...

  • Page 39: Ignition Control

    Ignition Control INTEGRATED CONTROL (Automatic Hot Surface Ignition System) TERMINAL DESIGNATIONS Humidifier (120VAC) Input (120VAC) LINE Transformer (120VAC) XFMR Indoor Air Qality Accessory Air Cleaner (120VAC) Blower - Cooling Speed (120VAC) COOL Blower - Heating Speed (120VAC) HEAT Dead terminals to park alternate spd taps PARK Continuous blower CONT...

  • Page 40: Unit Start-Up

    8 - Move gas valve switch to ON. See FIGURE 60. some gas is heavier than air and will settle on the floor. The gas valve on the ML193UH is equipped with a gas control switch (lever). Use only your hand to move switch.

  • Page 41: Gas Pressure Adjustment

    4 - Move gas valve switch to OFF. Furnace should operate at least 5 minutes before check- ing gas flow. Determine time in seconds for two revolu- 5 - Replace the upper access panel. tions of gas through the meter. (Two revolutions assures Failure To Operate a more accurate time.) Divide by two and compare to time n table 10 below.

  • Page 42: Proper Cumbustion

    Proper Cumbustion High Altitude Information Furnace should operate minimum 15 minutes with correct NOTE - In Canada, certification for installations at eleva- manifold pressure and gas flow rate before checking com- tions over 4500 feet (1372 m) is the jurisdiction of local bustion.

  • Page 43: Testing For Venting And Combustion Air

    6 - Follow the lighting instruction to place the appliance being inspected into operation. Adjust thermostat After the ML193UH gas furnace has been started, the fol- so appliance will operate continuously. lowing test should be conducted to ensure proper venting...

  • Page 44: Other Unit Adjustments

    Other Unit Adjustments HEAT FAN OFF TIME IN SECONDS Primary Limit. The primary limit is located on the heating compartment vestibule panel. This limit is factory set and requires no adjustment. Flame Rollout Switches (Two) NO JUMPER To adjust fan-off timing, reposition jumper across pins to These manually reset switches are located on the front of achieve desired setting.

  • Page 45: Twinning The Ml193Uh

    Field installation of twinning consists of connecting wires Twinning the ML193UH between the ”C” and ”Twin” terminals of the two controls. The control board in this furnace is equipped with a provi- The 24 VAC secondary of the two systems must be in sion to ”twin”...

  • Page 46: Service

    At the beginning of each heating season, and to comply and operation. Consult Service Literature for proper with the Lennox Limited Warranty, your system should be combustion values. checked as follows: 14 - Verify operation of CO detectors and replace 1 - Check wiring for loose connections, voltage at batteries as required.

  • Page 47: Repair Parts List

    Repair Parts List 3 - Remove the clean out cap from the condensate trap and empty water. Inspect the trap then reinstall the The following repair parts are available through Lennox clean out cap. dealers. When ordering parts, include the complete fur-...

  • Page 48: Start-Up & Performance Check List

    Start-Up & Performance Check List UNIT SET UP Furnace: Model Number_______________ Serial Number_________________ SUPPLY Line Voltage GAS SUPPLY LP Propane Gas Natural Gas Piping Connections Tight Leak Tested Flter Supply Line Pressure “W.C.________ RETURN AIR Gas Supply Pressure DUCT SYSTEM SUPPLY AIR DUCT Sealed Insulated (if necessary)
  • Page 49 UNIT OPERATION HEATING MODE COOLING MODE GAS MANIFOLD PRESSURE “W.C._____ INDOOR BLOWER AMPS______ COMBUSTION SAMPLE CO CO PPM_______ TEMPERATURE DROP ______ Return Duct Temperature _________ INDOOR BLOWER AMPS______ Supply Duct Temperature _______ Temperature Drop = _________ TEMPERATURE RISE TOTAL EXTERNAL STATIC (dry coil) Supply Duct Temperature ________ Supply External Static _______ Return Duct Temperature...
  • Page 50 Requirements for Commonwealth of Massachusetts Modifications to NFPA-54, Chapter 10 4 - INSPECTION. The state or local gas inspector of the side wall, horizontally vented, gas-fueled equipment Revise NFPA-54 section 10.8.3 to add the following shall not approve the installation unless, upon requirements: inspection,the inspector observes carbon monoxide For all side wall, horizontally vented, gas-fueled equip-...
  • Page 51 Addendum For The Provice Of Saskatchewan and Manitoba See below for venting in the province of Saskatchewan and Manitoba. Lennox approves the following termination for use in Saskatchewan and Manitoba Canada. 12”...

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