86
RT-SVX092A-EN
Gas Heat Operation and Maintenance
Gas Heat Unit General
Information
WARNING
Hazard of Explosion or Fire!
Failure to follow instructions could result in death or
serious injury and equipment or property damage.
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
IF YOU SMELL GAS, follow instructions below:
• Do not try to light any appliance.
• Do not touch any electrical switch.
• Do not use any phone in your building.
• Open windows and doors.
• Alert others and evacuate building immediately.
• From a phone outside of the building,
immediately call your gas supplier. Follow the
gas supplier’s instructions. If you cannot reach
your gas supplier, call the fire department.
WARNING
Safety Hazards!
Failure to follow instructions below could result in
death or serious injury and equipment or property
damage.
• Do not use this furnace if any portion has been
under water as it may have rendered the unit
hazardous to operate. Immediately call a
qualified service technician to inspect the
furnace and to replace any part or the control
system and any gas control which has been
under water.
• Should overheating occur, or the unit gas valve
fail to shut off, close the gas valve to the
furnace before shutting off the electrical supply.
WARNING
Safety Hazards!
Failure to follow instructions below could result in
death or serious injury.
• Never perform any maintenance procedures until
the electrical power to the unit is turned off.
• Never perform any maintenance procedures until
the gas valve to the gas supply is turned off.
• Never remove any panels from the unit while it is
operating.
• Never remove panels or parts from the unit that
are not discussed in this manual.
• Never cover the unit, since it is designed to
operate year round.
The unit has a complex design. To verify it performs safely
and gives long lasting services, some of the maintenance
work must be performed by a qualified service person.
When a service person is referred to in this manual, this is
a service technician who has had special training or a
number of years experience in servicing this type of
equipment. It is your responsibility to select a qualified
service company that can provide a service person of this
caliber.
Notes:
• Do not operate the unit without filters.
• See Table 1, p. 10 for filter sizes.
• Remove filter access panel to access filters.
• For thermostat operation, see “Thermostat,” p.
11.
Heating System
Heating Cycle Operation
The unit heating system is a solid-state electronic ignition
control that lights the furnace burners each time the
thermostat calls for heat. At the end of each heating cycle
the furnace burners are extinguished. This type of system
is called Direct Spark Ignition (DSI).
A normal heating cycle begins when the air temperature
drops below the thermostat setting. The thermostat then
energizes the heating electrical circuit that starts and
controls the furnace burners. Shortly after the burners
ignite the indoor fan starts and circulates warm air through
the conditioned space.
When the air temperature rises to the thermostat setting
the thermostat deenergizes the heating electrical circuit,
which in turn extinguishes the burners. The indoor fan
continues to circulate warm air until most of the heat is
removed from the unit's combustion chamber.
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