4 - Removethecollectorboxlocatedbehindthecombus- tionairinducerBecarefulwiththecollectorboxgas.- ket.Ifthegasketisdamaged,it mustbereplacedto preventleakage,

5 - Labelthewiresfromgasvalveandrolloutswitches, thendisconnectthem.

6 - DisconnectgassupplypipingRemovefourscrewsse.- curingtheburnermanifoldassemblytothevestibule panelandremovetheassemblyfromtheunit,

NOx INSERTS (X models only)

/

FIGURE 31

7 - NOx units only- Remove the three screws that attach the NOx insert to the corbel at the entrance to each

heat exchanger section, Carefully remove the NOx in- sert from each section, See figure 31.

8 - Insert the brush end of cable snake into the top of one of the heat exchanger openings, Do not force the cable into the heat exchanger. Insert the cable and operate the drill on slow speed. Move the cable in and out of the heat exchanger section three or four times or until sufficient cleaning is accomplished. Reverse drill and slowly work the cable out of opening,

9- Repeat procedure for each heat exchanger section.

10- After each of the top heat exchanger sections has been cleaned, insert the brush end of the cable snake into the bottom openings of each of the heat exchanger sections and clean as described in step 8,

11- Remove the cable from the heat exchanger. Use a vac- uum cleaner to remove debris knocked loose during cleaning.

12- Attach the exhaust end (positive pressure) of the vacu- um cleaner to the top of the heat exchanger section, Any loose debris will be forced to the bottom of the heat exchanger section, Vacuum debris from bottom open- ings.

13- Replace collector box and combustion air inducer. Check gaskets for damage. Damaged gaskets must be replaced to avoid heat exchanger leaks. Replace all screws to the collector box and combustion air inducer. Failure to replace all screws may cause leaks,

14- To clean the burner, run a vacuum cleaner with a soft brush attachment over the face of burners. Visually in- spect inside the burners and crossovers for any blockage caused by foreign matter. Remove any blockage,

15- NOx Units - Reattach the NOx inserts to the corbels at the entrance to each heat exchanger opening, See fig- ure 31,

16- Replace burner/manifold assembly onto the vestibule panel,

17- Reconnect wires to pressure switch, roll-out switches, gas valve and combustion air inducer. Refer to unit wir- ing diagram,

18- Reconnect vent pipe to combustion air inducer outlet, 19- Reconnect gas supply piping,

20- Turn on power and gas supply to unit,

21- Set thermostat and check for proper operation,

22- Check all piping connections, factory and field, for gas leaks. Use a leak detecting solution or other preferred means,

Ak CAUTION

23- Ira leak is detected, shut gas and electricity offand repair leak,

24- Repeat steps 23 and 24 until no leaks are detected. 25- Replace front access panel.

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Lennox International Inc G50UH-24A-070, G50UH-48C-110, G50UH-60D-135, G50UH-36C-110, G50UH-36B-090, G50UH-60C-110 Ak Caution
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G50UH-60D-155, G50UH-36B-090, G50UH-36A-070, G50UH-24A-045, G50UH-60D-135 specifications

Lennox International Inc is renowned for its high-quality heating, ventilation, and air conditioning (HVAC) solutions. Among its versatile product lineup are the G50UH series of gas furnaces, which exemplify efficiency and performance. These models, specifically the G50UH-24A-070, G50UH-24A-045, G50UH-36B-090, G50UH-36A-070, and G50UH-48C-135, offer a range of features tailored to meet varying residential heating demands.

One of the key features of the G50UH series is its energy efficiency. Many models in this lineup boast an impressive Annual Fuel Utilization Efficiency (AFUE) rating, which indicates their ability to convert fuel into usable heat efficiently. These high AFUE ratings can lead to significant savings on energy bills, making these furnaces a cost-effective choice for homeowners.

The G50UH series incorporates advanced technology, including multi-speed blowers that enhance comfort levels. This feature allows for better airflow control and can help maintain consistent temperatures throughout the home. The controlled airflow reduces temperature swings and ensures that every room benefits from the heating provided by the furnace.

Safety is paramount in Lennox designs, and the G50UH series is no exception. Each unit is equipped with safety features designed to protect both the furnace and the home. Dual certification ensures that the products meet stringent safety standards. Moreover, features like a self-diagnostic control board streamline maintenance, allowing homeowners to easily identify potential issues.

Another important characteristic of the G50UH series is its compact design, which is beneficial for homes with limited space. The units are designed to fit comfortably in various installation environments, from basements to utility rooms.

Durability is another hallmark of the G50UH furnaces. Constructed with quality materials, these units are designed for long-term reliability. This ensures that homeowners can enjoy the comfort of their heating systems without frequent repairs.

Lastly, Lennox provides extensive support and warranties, giving homeowners peace of mind associated with their purchase. With options tailored to meet diverse home heating needs, the Lennox G50UH series stands out in the HVAC market, combining efficiency, safety, and reliability in one impressive package.
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