HOW Your GAS Furnace Works

Your furnace is a very easy appliance to take for granted. Season after season, it sits there in your home, keeping you warm and comfortable. For this reason, you may never have given much thought to the way your furnace operates. In order to get the safest and most efficient oper- ation from your furnace, you should understand how your furnace does its job.

When you set your thermostat to provide more heat in your home, you are starting the heating cycle of the furnace. First, the inducer motor starts to purge the heat exchanger of any remaining gases. Next, the hot surface igniter glows and after a warm-up period the gas valve opens and ignition occurs. A short time later, the blower starts and dis- tributes the warm air throughout the home. When the temperature set- ting on your thermostat is reached, the gas valve closes, the main burners are turned off, and the blower continues to run until the remain- ing warm air in the system is distributed. When the blower stops, the heating cycle has ended.

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To Turn Off the Appliance:

1.Set the thermostat to lowest setting.

2.Turn off all electric power to the appliance if service is to be per- formed.

3.Remove burner access panel.

4.Move gas control switch to the “OFF” position.

5.Replace burner access panel.

Should overheating occur, or the gas valve fail to shut off, turn the external manual gas valve in the gas supply line to the furnace to the “off” position and let the furnace cool off before shutting off the electrical power supply. Refer to Figures 5 & 6.

START-UP AND SHUTDOWN INSTRUCTIONS

Read the Instructions Below Before Trying to Start the Furnace

If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury, and/or loss of life.

OUTLET

PRESSURE

PORT

INLET

WRENCH BOSS

INLET PRESSURE PORT

	VENT PORT
	OUTLET
OFF
ON	MAIN REGULATOR
ON/OFF SWITCH	ADJUSTMENT
ON/OFF SWITCH
(Shown in ON position)

A.This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.

B.BEFORE OPERATING; smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.

C.Use only your hand to push the gas control switch to the “on” posi- tion. Never use tools. If the switch will not operate by hand, don’t try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or explosion.

D.Do not use this appliance if any part has been under water. Imme- diately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control, which has been under water.

Operating Instructions:

1.	STOP! Read the safety information above.
2.	Set the thermostat to the lowest setting.
3.	Turn off all electric power to the appliance.

FIGURE 4: Gas Valve - White Rodgers

EXTERNAL MANUAL

SHUTOFF VALVE

TO GAS

SUPPLY

		GROUNDED JOINT UNION
		GROUNDED JOINT UNION
DRIP		MAY BE INSTALLED
LEG		INSIDE OR OUTSIDE UNIT.

FIGURE 5: Gas Piping

MANUAL

SHUT-OFF

VALVE

4.	Remove burner door.
5.	Move gas control switch to the “OFF” position. Do not force.

GAS PIPE

DRIP LEG

6.	Wait five (5) minutes to clear out any gas. If you then smell gas,
	STOP! Follow “B” in the safety information above. If you don’t
	smell gas, go to next step.
7.	Move gas control switch to the “ON” position. Do not force.
8.	Replace burner door.

GAS PIPE

GAS BURNERS

GAS VALVE

9.	Turn on all electric power to the appliance.
10.	Set thermostat to the desired setting. Burner will light, which may
	take 30-60 seconds.
11.	After three (3) trials for ignition, if the appliance will not operate fol-
	low the instructions, “TO TURN OFF THE APPLIANCE” and call
	your service technician or gas supplier.

DRIP	MANUAL
LEG	SHUT-OFF VALVE

FIGURE 6: Horizontal Gas Piping

NOTE: The spring-loaded safety cut-off switch, mounted on the blower deck, behind the indoor fan access panel will automatically cut off the electrical power supply to the furnace when the blower panel is removed. As a safety precaution, all electrical power and the gas supply to the furnace should be turned off before servicing.

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FC9S, PS9, FL9S specifications

White Rodgers is a renowned name in the HVAC industry, and their line of gas control units, including the PS9, FC9S, and FL9S models, exemplifies innovation and reliability. These products are designed to offer precise gas control for a wide range of heating applications, making them essential components in modern heating systems.

The White Rodgers PS9 is an integrated gas valve that combines multiple functionalities into a single unit. This model features a compact design that allows it to fit into tight spaces while still providing alignment with various burner types. The PS9 incorporates a user-friendly wiring connection system, facilitating easier installation and maintenance. With its adjustable pressure settings, this model can optimize performance in diverse heating scenarios, ensuring users can enjoy efficient and effective temperature control.

The FC9S model enhances user experience with its advanced safety features. It is equipped with a built-in safety switch that cuts off gas supply in the event of a malfunction. Additionally, the FC9S features a self-diagnostic capability, which allows it to detect system faults and provide feedback for more straightforward troubleshooting. This feature not only improves operational safety but also minimizes downtime in heating systems.

The FL9S model stands out for its versatility and adaptability. Designed for a variety of applications, the FL9S works efficiently in both residential and commercial settings. It supports multiple gas types, including natural gas and propane, making it a flexible choice for users with different heating needs. Like its counterparts, the FL9S also features robust construction to withstand varying environmental conditions, ensuring longevity and reliability in heat applications.

Across these models, White Rodgers utilizes high-quality materials and state-of-the-art manufacturing processes. Each unit is subjected to rigorous testing to ensure it meets industry standards for safety and efficiency. Moreover, the incorporation of energy-saving technologies in these gas valves aligns with growing environmental considerations, making them an excellent investment for those looking to enhance their heating systems.

In conclusion, the White Rodgers PS9, FC9S, and FL9S models represent cutting-edge technology in gas control solutions, providing essential features for reliability, safety, and efficiency in heating applications. Whether for residential or commercial use, these units are engineered to meet the demands of modern heating, making them a trusted choice for HVAC professionals and homeowners alike.