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3.4 Shut-down Instructions
EMERGENCY SHUT-DOWN
•
Set the disconnect switch to the "OFF" position
•
Close the main manual firing valve in the manifold on gas fired duct furnaces
NOTE: The installer must clearly identify all emergency shut-off devices
1. De-energize the heating control, turning the burner off.
2. Close the Manual Firing Valve in the manifold on gas fired duct furnaces.
3. If the duct furnace was firing at the time of shut down allow the main blower to run for a
sufficient period to cool off the heat exchanger. The duct furnace may have an
automatic blower override that will perform this function automatically, running the
blower until the air reaches a cool enough temperature.
4. Turn the duct furnace control to the "OFF" position.
5. Set the main power disconnect to the duct furnace to the "OFF" position.
6. Close the Main Manual Shut-Off Valve if the burner is shut down for an extended period
of time to prevent gas leaking into the combustion chamber.
7. If the duct furnace is to remain idle for an extended period, it is important that the fan
and motor shafts be rotated by hand so that the grease can be spread on the bearing
parts to avoid corrosion by moisture condensation and accumulation.
3.5 Suggested Tools And Instruments
1. Volt/Ohm Meter 5. Ammeter
2. D.C./Microammeter 6. U-Tube Manometer (0-10” W.C.)
3. Stack & Temperature Thermometer 7. Flue Gas Test Equipment
4. Gas Pressure Gauge 8. Standard Hand Tools
