7
STARTUP AND SHUTDOWN
INSPECTION
FREQUENCY
The furnace should be inspected annually by a licensed
HVAC technician. Table 1 (page 8) contains suggested
inspections and frequency of maintenance.
VENTING SYSTEM
• Existing masonry chimneys should be inspected and
relined if necessary. Vent pipe must slope upwards
and be physically sound without holes or corrosion.
Any corroded section of vent pipe must be replaced,
and any obstruction or blockage must be removed by
a licensed HVAC technician.
• Flue passageways, the vent system, and the burners
should be inspected and cleaned (if required) by a
licensed HVAC technician annually to ensure continued
safe operation.
BLOWER AND FILTER
It is recommended that the blower compartment be
cleaned of dirt or lint that may have accumulated in the
compartment or on the blower and motor as part of the
annual inspection.
AIR FOR COMBUSTION
• For proper and safe operation, the furnace needs air for
combustion and ventilation.
Do Not
block or obstruct
air openings on the furnace, or any air openings where
the furnace may be installed, including any surrounding
spaces.
• Direct vent furnaces pull combustion air from the
outdoors and vent combustion products back outside.
Combustion air coming from the outside needs to be
clean of chemicals that can cause corrosion, such as
pool chlorinating products.
AIR FOR COMFORT
• Keep air fi lters cleaned. It is recommended that the
furnace air fi lter be checked at least once a month.
Clean or replace fi lter to maintain proper airfl ow and
achieve maximum effi ciency.
• Furniture and drapery should be arranged so that
the supply air registers and return grilles are not
obstructed.
Figure 2. Gas Valves
IN
TWO - STAGE VALVE
ON
OFF
SINGLE STAGE VALVE
MODULATING VALVE
STARTING THE FURNACE:
1. Make sure the fi lter is clean and in place.
2. Make sure the vent system is properly installed.
3. Set the thermostat to the lowest setting.
4. Close the manual gas valve outside the furnace.
5. Turn off all electric to the furnace.
6. Remove the door from the burner compartment.
7. Set the gas valve switch or knob to the OFF position.
See Figure 2 for gas valve switch or knob location.
8. Wait 5 minutes. If there is any smell of gas, see “WHAT
TO DO IF YOU SMELL GAS” on page 5.
9. Set the gas valve switch or knob to the ON position.
10. Turn on all electric to the furnace.
11. Open the manual gas valve.
12. Turn the thermostat back up to force ignition.
13. Observe operation, including burners. If burners fail
to ignite, call a licensed HVAC technician.
14. Replace the door on the burner compartment.
SHUTTING DOWN THE FURNACE:
Should you ever need to shut down your furnace for
service or maintenance, follow these steps:
1. Set the thermostat to the lowest setting.
2. Close the manual gas valve outside the furnace.
3. Turn electric to the furnace off.
4. Open the door to the burner compartment.
5. Set the gas valve switch or knob to the OFF
position.
6. Replace the door on the burner Compartment.
Summary of Contents for *MQ 97%+ Upfl ow/Horizontal
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