Table of Contents
Advertisement
© 2017 Lennox Industries Inc.
Dallas, Texas USA
Contents
Unit Dimensions .............................................................2
ML180DF Gas Furnace ..................................................3
Shipping and Packing List ..............................................3
Safety Information ..........................................................3
Use of Furnace as Construction Heater .........................4
General ...........................................................................4
Combustion, Dilution & Ventilation Air ............................5
Setting Equipment .........................................................9
Filters ............................................................................10
Duct System ................................................................. 11
Venting.......................................................................... 11
DOWNFLOW
AIR FLOW
Page 1
INSTALLATION
INSTRUCTIONS
ML180DF
MERIT® SERIES GAS FURNACE
DOWNFLOW AIRDISCHARGE
507326-02
11/2017
Supersedes 05/2016
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
CAUTION
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.
WARNING
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.
Gas Piping ....................................................................16
Electrical .......................................................................18
Integrated Control .........................................................21
Unit Start Up .................................................................22
Gas Pressure Adjustment .............................................23
Proper Combustion.......................................................23
High Altitude .................................................................23
Other Unit Adjustments.................................................24
Service..........................................................................26
Repait Parts ..................................................................28
Advertisement
Table of Contents
Related Manuals for Lennox ML180DF045P24A
Summary of Contents for Lennox ML180DF045P24A
-
Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS ML180DF © 2017 Lennox Industries Inc. Dallas, Texas USA MERIT® SERIES GAS FURNACE DOWNFLOW AIRDISCHARGE 507326-02 11/2017 Supersedes 05/2016 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
2-3/16 (56) Left (Either Side) 6-5/8 (168) Right 7-1/8 (181) Left Supply Supply 19-1/4 (489) (19) (19) (19) FRONT VIEW SIDE VIEW Model No. ML180DF045P24A ML180DF045P36A 14-1/2 13-3/8 4-3/4 ML180DF070P36A ML180DF090P36B 17-1/2 16-3/8 6-1/4 ML180DF090P48B ML180DF110P60C 19-7/8 19-1/2 Page 2... -
Page 3: Ml180Df Gas Furnace
Certifications ML180DF Gas Furnace The ML180DF gas furnace is shipped ready for installa- ML180DF units are CSA International certified. tion in the downflow position fueled by natural gas. A con- In the USA, installation of gas furnaces must conform with version kit (ordered separately) is required for use in LP/ local building codes. -
Page 4: Use Of Furnace As Construction Heater
Safety Information directly into it. This could cause improper combus- tion and unsafe operation. Lennox does not recommend the use of ML180DF units as a construction heater during any phase of construc- • Do not block the furnace combustion air openings tion. -
Page 5: Combustion, Dilution & Ventilation Air
WARNING CAUTION This prodcut contains a chemical known to the State Insufficient combustion air can cause headaches, of California to cause cancer, birth defects, or other nausea, dizziness or asphyxiation. It will also cause reproductive harm. excess water in the heat exchanger resulting in rusting and premature heat exchanger failure. - Page 6 When the furnace is installed so that supply ducts carry square inch (645 mm2) per 1,000 Btu (.29 kW) per hour of air circulated by the furnace to areas outside the space total input rating of all gas-fired equipment in the confined containing the furnace, the return air must be handled by space.
- Page 7 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE (Inlet Air from Crawlspace and Outlet Air to Ventilated Attic) CHIMNEY OR GAS VENT VENTILATION LOUVERS (Each end of attic) OUTLET WATER FURNACE HEATER INLET VENTILATION LOUVERS (For unheated crawl space) AIR FLOW NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch (645 ) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.
- Page 8 CAUTION Downflow Installation Downflow unit installs in three ways: on non-combustible The furnace and downflow combustible flooring base flooring, on combustible flooring using a downflow com- shall not be installed directly on carpeting, tile, or other bustible flooring base, or on a reverse-flow cooling cabi- combustible material other than wood flooring.
-
Page 9: Setting Equipment
Setting Equipment WARNING Do not install the furnace on its front, back or in the horizontal position. See figure 12. Do not connect the return air ducts to the back of the furnace. Doing so will adversely affect the operation of the safety control COOLING COIL devices, which could result in personal injury or death. -
Page 10: Filters
Horizontal Front Back Figure 12 Downflow Application CAUTION Allow for clearances to combustible materials as indicated If this unit is being installed in a space serviced by an on the unit nameplate. Minimum clearances for closet or exhaust fan, power exhaust fan, or other device which alcove installations are shown in figure 13. -
Page 11: Duct System
The venting tables in this manual were extracted from the TABLE 3 National Fuel Gas Code (NFPA 54 / ANSI Z223.1) and are Cabinet Width inches Air Filter Size inches provided as a guide for proper vent installation. Proper application, termination, construction and location of vents A - 14-1/2 14 x 25 x 1 must conform to local codes having jurisdiction. - Page 12 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 13 Never connect a Category I appliance to a chimney that is TABLE 4 servicing a solid-fuel appliance. If a fireplace chimney flue Connector Diameter Maximum Horizontal is used to vent this appliance, the fireplace opening must inches (mm) Connector Length feet (m) be permanently sealed.
- Page 14 19 - In no case, shall the vent connector be sized more 21 - When connecting this appliance to an existing than two consecutive table size diameters over the dedicated or common venting system, you must size of the draft hood outlet or flue collar outlet. inspect the venting system’s general condition and look for signs of corrosion.
- Page 15 TABLE 6 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) Height Lateral 3 inch 4 inch 5 inch 6 inch Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) TABLE 7...
-
Page 16: Gas Piping
Gas Supply 1 - Seal any unused openings in the common venting system. 1 - This unit is shipped standard for left or right side 2 - Inspect the venting system for proper size and installation of gas piping (or top entry in horizontal horizontal pitch. - Page 17 TABLE 8 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 18: Electrical
Leak Check The unit is equipped with a field make-up box on the left hand side of the cabinet. The make-up box may be moved After gas piping is completed, carefully check all piping to the right side of the furnace to facilitate installation. If connections (factory- and field-installed) for gas leaks. - Page 19 Complete the wiring connections to the equipment. Use Any humidifier rated up to one amp can be connected to the provided unit wiring diagram. Use 18-gauge wire or this terminal with the neutral leg of the circuit being con- larger that is suitable for Class II rating for thermostat con- nected to one of the provided neutral terminals.
- Page 20 ML180DF Schematic Wiring Diagram Figure 20 Page 20...
-
Page 21: Integrated Control
Integrated 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 22: Unit Start Up
7 - Wait five minutes to clear out any gas. If you then Unit Start-Up smell gas, STOP! Immediately call your gas supplier FOR YOUR SAFETY READ BEFORE LIGHTING from a neighbor’s phone. Follow the gas supplier’s instructions. If you do not smell gas go to next step. WARNING 8 - Move switch on gas valve to ON. -
Page 23: Gas Pressure Adjustment
Supply Pressure Measurement 11 - Are flame rollout switches tripped? If flame rollout switches are tripped, call the service technician for A threaded plug on the inlet side of the gas valve provides inspection. access to the supply pressure tap. Remove the threaded Heating Sequence Of Operation plug, install a field-provided barbed fitting and connect a manometer to measure supply pressure. -
Page 24: Other Unit Adjustments
TABLE 11 Manifold Pressure Settings at all Altitudes Line Pressure in. wg. Model 0 - 4500 ft. 4501 - 7500 ft . 7501 - 10,000 ft. Input Size 13.0 LP/Propane 10.0 10.0 10.0 11.0 13.0 13.0 LP/Propane 10.0 10.0 10.0 11.0 13.0 13.0... - Page 25 5 - Refer to blower speed selection chart on unit wiring HEAT FAN OFF TIME IN SECONDS diagram for desired heating or cooling speed. See Blower performance data beginning on the next page. 6 - Connect selected speed tap at integrated control speed terminal.
-
Page 26: Service
Annual Furnace Maintenance Service At the beginning of each heating season, and to comply WARNING with the Lennox Limited Warranty, your system should be checked by a licensed professional technician (or equiva- ELECTRICAL SHOCK, FIRE, lent) as follows: OR EXPLOSION HAZARD. - Page 27 Cleaning the Burners 9 - Ensure sufficient combustion air is available to the furnace. Fresh air grilles and louvers (on the unit NOTE - Use papers or protective covering in front of the and in the room where the furnace is installed) furnace must be properly sized, open and unobstructed to during cleaning.
-
Page 28: Repait Parts
FIGURE 25 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: ML180DF110P60C-01. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier.