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E 2018 Lennox Industries Inc.
Dallas, Texas, USA
Certified by SAI Global
GSCS20254
AIR FLOW
HORIZONTAL LEFT
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UPFLOW
HORIZONTAL RIGHT
Table of Contents
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INSTALLATION
INSTRUCTIONS
ML180UHA
®
MERIT
SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
507407-03
10/2018
Supersedes 507407-02
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 HVAC in
staller (or equivalent), service agency or the gas sup
plier.
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
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WARNING
CAUTION
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Summary of Contents for Lennox ML180UHA
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS E 2018 Lennox Industries Inc. Dallas, Texas, USA ML180UHA Certified by SAI Global GSCS20254 ® MERIT SERIES GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE 507407-03 10/2018 Supersedes 507407-02 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
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 ML180UHA Model No. 070AP36A 090AP48B 110AP36C 110AP60C 135AP60D Page 2... -
Page 3: Ml180Uha Gas Furnace
TABLE 1 ML180UHA Gas Furnace Normal Wobbe The ML180UHA unit is shipped ready for use with Natural 46.95 mj / m 50.15 mj / m 53.28 mj / m Number* (1260 Btu / ft (1346 Btu / ft (1430 Btu / ft gas (LP/Propane changeover kits available), and for instal... -
Page 4: General
When the furnace is installed in an attic or other insu furnace. lated space, keep insulation away from the furnace. NOTE - ML180UHA series units must not be used as a • Please consult the manufacturer of your evaporator coil “construction heater” during any phase of construction. - Page 5 construction with weather stripping and caulking around CAUTION the windows and doors, follow the procedures in the air from outside section. Insufficient combustion air can cause headaches, Confined Space nausea, dizziness or asphyxiation. It will also cause excess water in the heat exchanger resulting in rust A confined space is an area with a volume less than 1.42 ing and premature heat exchanger failure.
- Page 6 Air from Outside in the enclosure. See figure 4. If air from outside is brought in for combustion and ventila When ducts are used, they shall be of the same cross-sec tion, the confined space must have two permanent open tional area as the free area of the openings to which they ings.
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Page 7: Setting Equipment
WATER The ML180UHA gas furnace can be installed as shipped HEATER in either the upflow position or the horizontal position. Select a location that allows for the required clearances that are listed on the unit nameplate. - Page 8 Upflow Applications safely. The furnace is equipped with a removable bottom panel to facilitate installation. Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or al Markings are provided on both sides of the furnace cabinet cove installations are shown in figure 6.
- Page 9 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 VENT FIGURE 10 PIPE Horizontal Applications The ML180UHA furnace can be installed in horizontal ap plications. Order horizontal suspension kit (51W10) from Lennox, or use equivalent suspension method. Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or al...
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Page 11: Filters
Before using any filter with this system, check the this furnace, or any other gas-fueled appliance specifications provided by the filter manufacturer against the data given in the appropriate Lennox (i.e., water heater), or carbon monoxide producing device Product Specifications bulletin. Additional informa... -
Page 12: Venting
Use the cut-out piece as a cover plate to patch unused opening on cabinet. The ML180UHA is a fan assisted furnace equipped with an Upflow Position integral mechanical means to either draw or force products... - Page 13 HORIZONTAL LEFT POSITION UPFLOW POSITION Side Vent Discharge Right Side Vent Discharge Flue Transition Cover Plate Collector Box Vent Pipe Pressure Switch Pressure Switch FLOW Vent Pipe FLOW D Cut combustion air inducer tubing from 229 mm ( 9” ) to 127 mm Make-Up Box Collector Box (5”) to avoid interference with inducer motor...
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Page 14: Gas Piping
HORIZONTAL RIGHT POSITION IMPORTANT Side Vent Discharge Pressure Switch Do not use an unlined masonry chimney as the flue for this appliance. FLOW Flue Transition Collector Box FIGURE 20 VENT CONNECTION UPFLOW AND HORIZONTAL POSITION “DISCONNECTED VENT” WARNING STICKER VENT PIPE (min. - Page 15 Gas Supply 5 - A 3 mm (1/8”) N.P.T. plugged tap or pressure port is lo cated on the gas valve to facilitate test gauge connec 1 - This unit is shipped standard for left or right side instal tion. See figure 27. lation of gas piping (or top entry in horizontal applica...
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Page 16: Electrical
Electrical when there is no cooling or heating demand. 2 - When the ML180UHA is running in the heating mode, CAUTION the indoor blower will run on the heating speed. 3 - When there is a cooling demand, the indoor blower will Electrostatic discharge can affect elec... -
Page 17: 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 FS - Flame Sense... - Page 18 ML180UHA Schematic Wiring Diagram FIGURE 26 Page 18...
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Page 19: Unit Start-Up
FIGURE 27 The gas valve on the ML180UHA 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 27. -
Page 20: Gas Pressure Adjustment
4 - Move lever on gas valve to OFF. See figure 27. IMPORTANT 5 - Replace the upper access panel. Failure To Operate The White Rodgers 36G24 gas valve (figure 27) 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 21: Other Unit Adjustments
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 5 for Take care to replace pressure tap plug. -
Page 22: Service
2 - Remove blower access panel. Filters 3 - Disconnect existing speed tap at integrated control All ML180UHA 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 23: Repair Parts
FIGURE 29 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: ML180UH070AP36A-01. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier. -
Page 24: Specifications
SPECIFICATIONS Model Number ML180UH070AP36A ML180UH090AP48B ML180UH110AP36C Heating Australian Gas Association Performance Energy Rating - Stars Input - Mj/h 69.6 92.8 116.1 Output - kW 15.5 20.6 25.8 Temperature rise range - °C 14 - 31 14 - 31 19 - 36 Gas Manifold Pressure (kPa) 0.87 / 2.30 0.87 / 2.30...