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E 2015 Lennox Industries Inc.
Dallas, Texas, USA
AIR FLOW
HORIZONTAL LEFT
Los calefactores están
aprobados por el Instituto
del Gas Argentino (IGA)
para funcionar con gas
natural y no se pueden
convertir para funcionar
con gas licuado.
Unit Dimensions
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ML180UHT Gas Furnace
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Shipping and Packing List
Requirements
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General
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Combustion, Dilution & Ventilation Air
Setting Equipment
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Filters
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Duct System
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Venting
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UPFLOW
HORIZONTAL RIGHT
Table of Contents
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INSTALLATION
INSTRUCTIONS
ML180UHT
®
MERIT
SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
507408-01
06/2015
Supersedes 507061-01
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 manuals, be alert
to the potential for personal injury or death.
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
2
Gas Piping
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3
Electrical
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3
Integrated Control
3
Unit Start-Up
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4
Gas Pressure Adjustment
4
Proper Combustion
7
High Altitude
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11
Other Unit Adjustments
11
Service
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12
Repair Parts
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Page 1
WARNING
CAUTION
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Litho U.S.A.
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Related Manuals for Lennox ML180UHT
Summary of Contents for Lennox ML180UHT
- Page 1 INSTALLATION INSTRUCTIONS E 2015 Lennox Industries Inc. Dallas, Texas, USA ML180UHT ® MERIT SERIES GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE 507408-01 06/2015 Supersedes 507061-01 Litho U.S.A. THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE This is a safety alert symbol and should never be ignored.
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Page 2: Top View
137 Right (Either Side) 40 Left ELECTRICAL INLET (Either Side) Side Return Air Opening (Either Side) (Either Side) Bottom Return Bottom Return Air Opening Air Opening FRONT VIEW SIDE VIEW ML180UHT Model No. 070TP36A 090TP48B 110TP36C 110TP60C 135TP60D Page 2... -
Page 3: Shipping And Packing List
ML180UHT Gas Furnace the Wobbe number from your gas supplier and compare to The ML180UHT unit is shipped ready for installation in the the chart. If the number is within the ranges listed for Natu upflow or horizontal right position (for horizontal left posi... -
Page 4: Combustion, Dilution & Ventilation Air
When the furnace is installed in an attic or other insu furnace. lated space, keep insulation away from the furnace. NOTE - ML180UHT series units must not be used as a “construction heater” during any phase of construction. Very low temperatures, harmful vapors and misplacement WARNING of the filters will damage the unit and its efficiency. - Page 5 Confined Space CAUTION A confined space is an area with a volume less than 1.42 (50 cubic feet) per .29 kW (1,000 Btu) per hour of the Insufficient combustion air can cause headaches, combined input rating of all appliances installed in that nausea, dizziness or asphyxiation.
- Page 6 top of the enclosure and one opening within 305 mm (12 tional area as the free area of the openings to which they inches) of the bottom. These openings must communicate connect. The minimum dimension of rectangular air ducts directly or by ducts with the outdoors or spaces (crawl or shall be no less than 75 mm (3 inches).
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Page 7: Setting Equipment
OR GAS VENT VENTILATION LOUVERS The ML180UHT gas furnace can be installed as shipped in (Each end of attic) either the upflow position or the horizontal position. OUTLET Select a location that allows for the required clearances that are listed on the unit nameplate. - Page 8 Upflow Applications panel to facilitate installation. Allow for clearances to combustible materials as indicated Markings are provided on both sides of the furnace cabinet on the unit nameplate. Minimum clearances for closet or al for installations that require side return air. Cut the furnace cove installations are shown in figure 6.
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Page 9: Side View
Optional Return Air Base (Upflow Applications Only -- For use with A, B, C and D cabinets) FURNACE FRONT IF BASE 584 (26) IS USED 83 (3−1/4) Overall WITHOUT (Maximum) Minimum INDOOR AIR IAQ CABINET, 279 (11) QUALITY A SINGLE Maximum CABINET RETURN AIR... - Page 10 FIGURE 10 Horizontal Applications The ML180UHT furnace can be installed in horizontal ap plications. Order horizontal suspension kit (51W10) from Lennox, or use equivalent suspension method. Page 10...
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Page 11: Duct System
TABLE 2 Horizontal Application Unit Installed on Platform Furnace Filter Size mm (in) and Quantity Line contact is permissible but not preferred Cabinet See the unit nameplate for Side Return Bottom Return Width clearances. A - 338 406 X 635 X 25 1 356 X 635 X 25 1 (14-1/2”) (16 X 25 X 1) - Page 12 Flue Transition Collector Box Pressure The ML180UHT is a fan assisted furnace equipped with an Switch integral mechanical means to either draw or force products of combustion through the combustion chamber and/or heat exchanger. When installed in the vertical position and vented vertically, the furnace operates with a non-positive vent stack pressure.
- Page 13 HORIZONTAL RIGHT POSITION UPFLOW POSITION Side Vent Discharge Right Side Vent Discharge Pressure Switch Flue Transition Cover Plate Collector Box Vent Pipe Pressure Switch FLOW Flue Transition Collector Box FLOW D Cut combustion air inducer tubing from 229 mm ( 9” ) to 127 mm FIGURE 18 (5”) to avoid interference with inducer motor FIGURE 16...
- Page 14 See figure 22. the combustion chamber and/or heat exchanger. The ML180UHT is not approved for use with horizontal venting. IMPORTANT NOTE - Use these instructions as a guide. They do not su...
- Page 15 SEALED suitable materials, or replaced with a gas vent or chimney suitable for venting ML180UHT series units. The chimney MAX. LENGTH -- SEE NOTE 1 passageway must be checked periodically to ensure that it BELOW.
- Page 16 Common Venting Using Tile-Lined Interior Masonry Chimney and Combined Vent Connector MINIMUM LENGTH = AS SHORT AS PRACTICAL. INTERIOR TILE-LINED FOR MAXIMUM LENGTH SEE NOTE TO LEFT MASONRY CHIMNEY NOTE- Refer to provided venting tables for installations. NOTE - the chimney must be properly sized per provided venting tables or lined with listed metal lining system.
- Page 17 16 - Vent connectors serving Category I appliances shall two consecutive table size diameters over the size of not be connected to any portion of mechanical draft the draft hood outlet or flue collar outlet. systems operating under positive pressure such as 20 - Do not install a manual damper, barometric draft regu...
- Page 18 TABLE 5 Vent Connector Capacity Type B Double-Wall Vents with Type B Double-Wall Connectors Serving Two or More Category I Appliances Vent and Connector Diameter - D (inches) Vent Connector 3 Inch 4 Inch 5 Inch 6 Inch Height Rise Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet)
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Page 19: Gas Piping
Removal of the Furnace from Common Vent Using local codes, resize the common venting system to the minimum vent pipe size. In the event that an existing furnace is removed from a venting system commonly run with separate gas ap Gas Piping pliances, the venting system is likely to be too large to prop... -
Page 20: Horizontal Application
Left Side Piping MANUAL (Standard) MAIN SHUT-OFF AUTOMATIC MANUAL VALVE GAS VALVE MAIN SHUT-OFF (With 1/8 in. NPT AUTOMAT VALVE Plugged Tap (With 1/8 in. NPT Shown) GAS VALVE Plugged Tap Shown) GROUND JOINT UNION GROUND JOINT UNION DRIP LEG Right Side Piping FIELD (Alternate) -
Page 21: Electrical
FIGURE 26 2 - When the ML180UHT is running in the heating mode, the indoor blower will run on the heating speed. Electrical 3 - When there is a cooling demand, the indoor blower will run on the cooling speed. -
Page 22: Integrated Control
Integrated Control INTEGRATED CONTROL (Automatic Hot Surface Ignition System) TERMINAL DESIGNATIONS HUM - Humidifier 240VAC LINE - Input 240VAC XFMR - Transformer 240VAC EAC - Electronic Air Cleaner 240VAC COOL - Cool Speed 240VAC PARK1, PARK2 - Dead terminals for alternate speed taps NEUTRALS - Neutral terminals 240VAC HEAT - Heating Speed 240VAC... - Page 23 ML180UHT Schematic Wiring Diagram FIGURE 28 Page 23...
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Page 24: Unit Start-Up
FIGURE 29 The gas valve on the ML180UHT unit will be equipped with a gas control switch. Use only your hand to move the 8 - Move lever on gas valve to ON. See figure 29. -
Page 25: Gas Pressure Adjustment
4 - Move lever on gas valve to OFF. See figure 29. IMPORTANT 5 - Replace the upper access panel. Failure To Operate The White Rodgers 36G24 gas valve (figure 29) is If the unit fails to operate, check the following: equipped with pressure posts for measuring supply 1 - Is the thermostat calling for heat? and manifold pressures. -
Page 26: High Altitude
High Altitude IMPORTANT The manifold pressure may require adjustment and com For safety, shut unit off and remove manometer as bustion air pressure switch may need replacing to ensure soon as an accurate reading has been obtained. proper combustion at higher altitudes. Refer to table 8 for Take care to replace pressure tap plug. -
Page 27: Service
2 - Remove blower access panel. Filters 3 - Disconnect existing speed tap at integrated control All ML180UHT filters are installed external to the unit. Fil speed terminal. ters should be inspected monthly. Clean or replace the fil See unit Product Specifications bulletin for indoor blower ters when necessary to ensure that the furnace operates data. -
Page 28: Repair Parts List
FIGURE 31 Repair Parts List The following repair parts are available through independent Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA International nameplate -- Example: ML180UH070TP36A-01. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier.