Thermostats

The gas valve on the G50UHi will be equipped with either a gas control knob or lever. Use only your hand to turn the gas control knob or push the gas lever. Never use tools. If the knob or lever will not move by hand, do not try to repair it. Call a qualified service technician. Force or attempted repair may result in a fire or explosion.

Placing the G50UHi furnace into operation:

G50UHi units are equipped with a SureLight® ignition sys. tem. Do not attempt to manually light burners on these fur. naces. Each time thermostat calls for heat, the burners will automatically light. The ignitor does not get hot when there is no call for heat on units with the SureLight® ignition sys. tem.

Operating the Gas Valve (Figures 3, 4 and 5)

1 - STOP! Read the safety information at the beginning of this section.

2 - Set the thermostat to the lowest setting. See figure 2. 3 - Turn off all electrical power to the unit.

FIGURE 2

4 - This furnace is equipped with an ignition device which automatically lights the burners. Do not try to light the burners by hand.

5 - Remove the upper access panel.

6 - White Rodgers 36E/36F Gas Valve - Switch gas valve lever to OFF.

Honeywell VR8205 Gas Valve - Turn knob on gas valve clockwise to OFF. Do not force. See figure 5.

7 - Wait five minutes to clear out any gas. If you then smell gas, STOP! Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instruc. tions. If you do not smell gas go to next step.

8 - White Rodgers 36E/36F Gas Valve - Switch gas valve le. ver to ON. See figure 3 for the White Rodgers 36E valve and figure 4 for the White Rodgers 36F valve.

Honeywell VR8205 Gas Valve - Turn knob on gas valve

counterclockwise to ON. Do not force.

White Rodgers 36E Series Gas Valve
	MANIFOLD
	PRESSURE
	ADJUSTMENT
	SCREW
	MANIFOLD
	PRESSURE
	OUTLET
GAS VALVE SHOWN IN OFF POSITION
FIGURE 3
White Rodgers 36F Series Gas Valve
	MANIFOLD
	PRESSURE
	ADJUSTMENT
	SCREW
	MANIFOLD
	PRESSURE
	OUTLET
GAS VALVE SHOWN IN OFF POSITION
FIGURE 4
Honeywell VR8205 Series Gas Valve
MANIFOLD	MANIFOLD
PRESSURE	PRESSURE
ADJUSTMENT	OUTLET
SCREW
ON
OFF
GAS VALVE SHOWN IN OFF POSITION
FIGURE 5
9 - Replace the upper access panel.
10 - Turn on all electrical power to to the unit.
11 - Set the thermostat to desired setting.

NOTE - When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line.

12- If the appliance will not operate, follow the section •Turning Off Gas to the Unit" and call your service tech. nician or gas supplier.

Turning Off Gas to the Unit

1 - Set the thermostat to the lowest setting.

2 - Turn off all electrical power to the unit if service is to be performed.

3 - Remove the upper access panel.

Page 4

G50UHi specifications

Lennox International Inc. has long been recognized as a leader in the heating, ventilation, and air conditioning (HVAC) industry, consistently pushing the boundaries of efficiency and comfort. One of their standout products is the G50UHi, an advanced gas furnace that showcases a blend of cutting-edge technology and innovative design aimed at enhancing indoor comfort while minimizing energy costs.

The G50UHi is designed with high-efficiency performance in mind, boasting an impressive Annual Fuel Utilization Efficiency (AFUE) rating. This means that the furnace converts a significant portion of the fuel it consumes into usable heat, ensuring that homes stay warm during colder months without excessive energy expenditure. With this feature, homeowners can experience reduced utility bills while contributing to a more sustainable environment.

One of the key technologies integrated into the G50UHi is the modulating gas valve. This system allows the furnace to adjust its heating output in small increments according to the specific needs of the home. This not only provides optimal comfort by maintaining consistent temperatures but also enhances energy savings as the furnace operates at lower capacities during milder weather.

Another notable characteristic of the G50UHi is its quiet operation. Engineered to minimize noise, this furnace is equipped with insulated cabinets and advanced fan technology, making it one of the quieter models on the market. This focus on sound reduction means that homeowners can enjoy a comfortable environment without disruptive background noise from their heating system.

Durability and reliability are also hallmarks of the G50UHi, featuring high-quality components that are built to last. The unit’s heat exchanger is crafted from robust materials, ensuring long-term performance and reduced risk of breakdowns. Additionally, Lennox provides a comprehensive warranty on the G50UHi, giving homeowners peace of mind regarding their investment.

The G50UHi is compatible with innovative smart thermostat technology, allowing for seamless integration with modern home automation systems. This compatibility not only enhances user control and convenience but also maximizes energy efficiency through optimized heating schedules.

In summary, the Lennox International Inc. G50UHi gas furnace represents a pinnacle of HVAC technology. Its high efficiency, modulating gas valve, quiet operation, durability, and smart technology integration make it an ideal choice for homeowners looking to improve comfort while controlling energy costs. With the G50UHi, Lennox continues to uphold its reputation as a trusted leader in the HVAC industry.

Lennox International Inc G50UHi manual Thermostats

Models: G50UHi

THERMOSTATS

G50UHi specifications