Lennox International Inc G61MP specifications

Page 36

G61MP−135 ONLY

Remove and discard two shipping screws.

FIGURE 41

9 − Remove 3/8 inch rubber cap from condensate drain plug and drain. Replace cap after draining.

10 − Disconnect condensate drain line from the conden- sate trap. Remove condensate trap (it may be neces- sary to cut drain pipe). Remove screws that secure condensate collars to either side of the furnace and re- move collars. Remove drain tubes from cold end header collector box.

11 − Disconnect condensate drain tubing from flue collar. Remove screws that secure both flue collars into place. Remove flue collars. It may be necessary to cut the exiting exhaust pipe for removal of the fittings.

12 − Mark and disconnect all combustion air pressure tub- ing from cold end header collector box.

13 − Mark and remove wires from pressure switches. Re- move pressure switches. Keep tubing attached to pressure switches.

14 − Disconnect the 3-pin plug from the combustion air in- ducer. Disconnect the two wires to the backup secon- dary limit, if applicable. Remove four screws which se- cure combustion air inducer to collector box. Remove combustion air inducer assembly. Remove ground wire from vest panel.

15 − Remove electrical junction box from the side of the fur- nace.

16 − Mark and disconnect any remaining wiring to heating compartment components. Disengage strain relief bushing and pull wiring and bushing through the hole in the blower deck.

17 − Remove the primary limit from the vestibule panel.

18 − Remove two screws from the front cabinet flange at the blower deck. Spread cabinet sides slightly to allow clearance for removal of heat exchanger.

19 − Remove screws along vestibule sides and bottom which secure vestibule panel and heat exchanger as- sembly to cabinet. Remove two screws from blower rail which secure bottom heat exchanger flange. Re- move heat exchanger from furnace cabinet.

20 − Back wash heat exchanger with soapy water solution or steam. If steam is used it must be below 275°F (135°C) .

21 − Thoroughly rinse and drain the heat exchanger. Soap solutions can be corrosive. Take care to rinse entire assembly.

22 − Reinstall heat exchanger into cabinet making sure that the clamshells of the heat exchanger assembly are resting on the support located at the rear of the cabi- net. Remove the indoor blower to view this area through the blower opening.

23 − Re-secure the supporting screws along the vestibule sides and bottom to the cabinet.

24 − Reinstall cabinet screws on front flange at blower deck.

25 − Reinstall the primary limit on the vestibule panel.

26 − Route heating component wiring through hole in blow- er deck and reinsert strain relief bushing.

27 − Reinstall electrical junction box.

28 − Reinstall the combustion air inducer. Reconnect the 3−pin plug to the wire harness. Reconnect the two wires to the backup secondary limit, if applicable.

29 − Reinstall pressure switches and reconnect pressure switch wiring.

30 − Carefully connect combustion air pressure switch hosing from pressure switches to proper stubs on cold end header collector box.

31 − Reinstall condensate collars on each side of the fur- nace. Reconnect drain tubing to collector box.

32 − Reinstall condensate trap on same side as exhaust pipe. Reconnect condensate drain line to the conden- sate trap.

33 − Use securing screws to reinstall flue collars to either side of the furnace. Reconnect exhaust piping and ex- haust drain tubing.

34 − Replace flexible exhaust tee on combustion air induc- er and flue collars. Secure using three existing hose clamps.

35 − Reinstall burner box assembly in vestibule area.

36 − Reconnect flame roll−out switch wires.

37 − Reconnect sensor wire and reconnect 2−pin plug from ignitor.

38 − Secure burner box assembly to vestibule panel using four existing screws. Make sure burners line up in center of burner ports.

39 − Reinstall gas valve manifold assembly. Reconnect gas supply line to gas valve.

40 − Reinstall burner box cover.

41 − Reconnect wires to gas valve.

42 − Replace the blower compartment access panel.

43 − Refer to instruction on verifying gas and electrical con- nections when re−establishing supplies.

44 − Follow lighting instructions to light and operate fur- nace for 5 minutes to ensure that heat exchanger is clean and dry and that furnace is operating properly.

45 − Replace heating compartment access panel.

Page 36

Page 35 Page 37
Image 36
Page 35 Page 37
Contents Table of Contents G61MPSpecifications Optional Accessories − Must be Ordered ExtraAfue Direct Vent Blower Data G61MP−36B−045 Performance Less Filter1495 2340 1285 1385 2410 Glass Assembly G61MP Parts ArrangementTOP CAP Sight BlowerDoor Interlock Switch S51 Circuit Breaker CB8−Control Box Control Transformer T1 Integrated Control Board A92Page TWO−STAGE Integrated Control Board Integrated Control Board Terminals 120VAC Neutral120VAC Line Integrated Control Board 5 Pin Terminal−Blower Compartment Blower Motor B3 and Capacitor C4 Secondary Limit Controls S21DS1 DS2 Description Supply AIR Blower−Heating Components Flame Sensor IgnitorBurners Figure Ignitor Bracket Burners Front View Burners TOP ViewFlame Rollout Switches S47 Combustion Air Inducer Prove Switch S18Clamshell Heat Exchanger Primary Limit Control S10Dual Combustion AIR Prove Switch CAI & Cold END Header BOX AssemblyFirst stage Negative Pressure Second stage Positive Combustion Air Inducer B6 II−PLACEMENT and Installation Outdoor Termination Kits and Corresponding Equivalencies−Vent Piping Guidelines −PVC Joint Cementing Procedure Minimum Vent Pipe LengthsMaximum Vent Pipe Lengths − Venting Practices Upflow or Downflow Direct or NON-DIRECT Vent ApplicationsTypical Exhaust Pipe Connections Direct Vent applications where combustion air is taken From indoors and flue gases are discharged outdoorsReducer Plug ReducerCarbon Monoxide Poisoning Hazard Sweep ELLPage − G61MP Vent Termination − AIR Inlet of Other Appliance Exhaust Pipe Termination Size Reduction Front View Side ViewUsing Existing Chimney ANGLE−CUT in Direction G61MP Direct Vent ApplicationG61MP NON−DIRECT Vent Application Using Existing Chimney Condensate PipingSide View NON−DIRECT Vent Wall Ring Termination Condensate Assembly Vent Nipple TEE Screw Coupling CLEAN−OUT AccessHose clamp −RINGS CAP HI/LO ScrewsFor Your Safety Read Before Operating −Preliminary and Seasonal Checks−Heating Start-Up −Safety or Emergency Shutdown IV−HEATING System Service Checks A−C.S.A. Certification−Testing Gas Piping −Extended Period Shutdown−Testing Gas Supply Pressure −Check Manifold Pressure− Proper Gas Flow Approximate − Proper Combustion− High Altitude − Condensate pH Range−Flame Signal −Temperature Rise−External Static Pressure VI−MAINTENANCE −Blower Speed TapsPage Page VII− Wiring and Sequence of Operation Sequence of Operation On Next Heating Sequence of Operation See BOX a LOW Flame Signal YES Normal Operation DS1 and DS2 Simultaneous Slow Flash YESEN or Heat Demand is SATISFIED. a Five Cooling Sequence of Operation Continuous LOW Speed FAN Sequence of Operation VIII− Field Wiring Applications and Jumper Settings SingleTWO Cool Transformer− Both diagnostic lights fail to light up LED#2−Off Miswiring of furnace or improper conDoor interlock switch failure − Diagnostic lights flash the roll−outUous fan demand Primary, secondary or backup secon − Diagnostic lights flash the limit failure modeLED#1−Slow Flash Miswiring of furnace or improper Connections at limit switchesSwitch failure code 2.5 minutes after LED#1−Off Prove switch lines damagedCondensate in prove switch line Prove switch does not close due to aTerminating the unit − Diagnostic lights flash the pressure Switch codeWith a heating demand Installed − After 5 tries the control diagnostics− Roll−out switch trips during − Diagnostic lights flash roll−out failFails to stay lit Operation. Problem is characterized − Combustion air inducer energizesMode Er motor Nostic lights flash low flame sense BurnerLED#1−Slow Flash Sensor rod is contaminatedService Notes

G61MP specifications

Lennox International Inc. has long been a leader in HVAC solutions, and the G61MP gas furnace exemplifies the company's commitment to innovation and energy efficiency. This high-efficiency gas furnace operates with an Annual Fuel Utilization Efficiency (AFUE) of up to 96%, allowing homeowners to save significantly on energy costs while maintaining a comfortable indoor environment.

One of the primary features of the G61MP is its modulating gas valve. This technology enables the furnace to operate at multiple levels of heating output, ensuring that it can adjust its performance according to the home’s heating demands. By modulating the heating output, the G61MP maximizes efficiency and minimizes energy waste, providing a consistent temperature and improved comfort.

The G61MP also incorporates advanced two-stage heating, which enhances its performance by reducing temperature fluctuations in the home. This feature is especially beneficial during transitional weather periods when heating needs may vary widely. With its ability to operate on a lower stage most of the time, the furnace can produce quieter operation and reduced energy consumption.

In terms of design, the G61MP includes a sealed combustion chamber that draws air from outside the home for combustion, enhancing safety and efficiency. This design feature eliminates the need for indoor air, improving indoor air quality. The furnace is also equipped with a high-efficiency ECM blower motor that not only boosts comfort but operates quietly and uses less electricity compared to traditional motors.

Further enhancing its efficiency, the G61MP utilizes a variable-speed blower, which allows for precise control of airflow throughout the home. This results in better humidity control and improved air distribution, providing an overall more comfortable environment.

The Lennox G61MP is compatible with the iComfort S30 smart thermostat, allowing homeowners to control their heating remotely, adjust settings based on their schedules, and access energy usage data. This connectivity transforms the G61MP into an integral part of a smart home ecosystem, facilitating energy conservation and comfort optimization.

Lastly, the G61MP is designed with durability in mind. Its robust construction and high-quality materials ensure reliable performance and lengthy service life. Homeowners can feel assured that they are investing in a heating solution that will meet their needs for many winters to come. In summary, the Lennox G61MP gas furnace stands out with its high efficiency, advanced technology, and user-friendly features, making it a top choice for homeowners seeking exceptional heating performance.
Top Page Image Contents