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
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. See Figure 4.
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 |
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ON | MAIN REGULATOR |
ON/OFF SWITCH | ADJUSTMENT |
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(Shown in ON position) |
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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. |
4. | Remove burner door. |
5. | Move gas control switch to the “OFF” position. Do not force. See |
FIGURE 4: Gas Valve - White Rodgers
EXTERNAL MANUAL
SHUTOFF VALVE
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SUPPLY |
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| GROUNDED JOINT UNION |
DRIP |
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| MAY BE INSTALLED |
LEG |
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| INSIDE OR OUTSIDE UNIT. |
FIGURE 5: Downflow Gas Piping
MANUAL
VALVE
Figure 4. |
6. Wait five (5) minutes to clear out any gas. If you then smell gas, |
GAS PIPE
DRIP LEG
| 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. See |
| Figure 4. |
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 |
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 |
FIGURE 6: Horizontal Gas Piping
NOTE: The
Unitary Products Group | 3 |
