FlueAnd Chimney

1 - Checkfluepipe,chimneyandallconnectionsfortight- nessandtomakesurethereisnoblockage,

2 - Checkunitforproperdraft,

3 - Ispressureswitchclosed?Obstructedfluewillcause unittoshutoffatpressureswitch,Checkflueandoutlet forblockages.

4- Resetmanualflamerolloutswitcheson burnerbox cover.

FailureToOperate Iftheunitfailstooperate,checkthefollowing:

1 - Isthethermostatcallingforheat?

2 - Areaccesspanelssecurelyinplace?

3 - Isthemaindisconnectswitchclosed?

4 - Istherea blownfuse?

5 - Isthefilterdirtyorplugged?Dirtyorpluggedfilterswill causethelimitcontroltoshuttheunitoff.

6 - Isgasturnedon atthemeter?

7 - Isthemanualmainshut-offvalveopen?

8 - Istheinternalmanualshut-offvalveopen?

9 - Istheunitignitionsysteminlockout?Iftheunitlocksout again,calltheservicetechniciantoinspecttheunitfor blockages.

,AWARNING

A,CAUTION

At the beginning of each heating season, a qualified techni- cian should check the system as follows:

Blower

Check the blower wheel for debris and clean if necessary. The blower motors are prelubricated for extended bearing life. No further lubrication is needed.

Filters

All G50UH(X) filters are installed external to the unit. Filters should be inspected monthly. Clean or replace the filters when necessary to ensure that the furnace operates prop- erly. Replacement filters must be rated for high velocity air- flow. Table 1 lists recommended filter sizes.

Flue And Chimney

Check the flue pipe, chimney and all connections for tight- ness and to make sure there is no blockage,

Electrical

1 - Check all wiring for loose connections.

2 - Check for the correct voltage at the furnace (furnace operating),

3 - Check amp-draw on the blower motor.

Motor NameplateActual

Cleaning the Heat Exchanger and Burners

NOTE - Use papers or protective covering in front of the fur- nace during cleaning.

Cleaning the heat exchanger requires a steel spring "snake," a reversible drill and a vacuum cleaner, The steel spring snake may be constructed by purchasing a 4 ft. long by 1/4 inch diameter steel wire cable and a 1/4 inch diame- ter wire brush, These items are available at a hardware

store. Insert wire end of brush into the open end of the spring cable. Crimp the cable around the brush so that the brush is secured and will not come off during cleaning, At- tach the other end of the cable to the reversible drill to com- plete the tool for cleaning the heat exchanger.

1 - Turn off both electrical and gas power supplies to fur- nace.

2 - Remove flue pipe and top cap from the unit. Label the pressure switch wires, then disconnect them.

3 - Remove the four screws that secure the combustion air inducer. Carefully remove the combustion air inducer to avoid damaging blower gasket. If gasket is damaged, it must be replaced to prevent leakage. See figure 30.

G50UH(X) BURNER & HEAT

EXCHANGER REMOVAL

H EAT

BURNER BOX ASSEMBLY

,&WARNING

FIGURE 30

Page 28

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.