Shutting Down Your Furnace; Performing Routine Maintenance - Carrier WEATHERMAKER INFINITY 58MCA User Manual

the thermostat back a few degrees—and compensating
for the difference with warmer clothing—can make a big
difference in your fuel consumption. The few degrees at
the top of your thermostat "comfort level'' are the most
costly degrees to obtain.
When the room temperature drops below the temperature
selected on the thermostat, the furnace will switch on auto-
matically. When the room temperature reaches the tempera-
ture selected on the thermostat, the furnace will be switched
off automatically.
Some thermostats have a "FAN'' mode with 2 selections:
AUTO and ON. When set on AUTO, the furnace blower
cycles on and off. In the ON mode, the furnace blower runs
continuously. Continuous fan keeps the temperature level in
your home more evenly balanced. It also permits the indoor
air to be continuously filtered. ComfortFan™ –On all but the
58MCA, the blower speed can be increased or decreased if
desired due to change of seasons, large gatherings in your
home, etc. Simply change your "FAN" from "on" to "off" (or
"auto" depending on your thermostat), and then return to
"on." The blower will switch to the next highest speed. There
are at least 3 speeds to choose from. If the blower is running
on its highest speed, a request to change will direct the blower
to return to its lowest speed.

SHUTTING DOWN YOUR FURNACE

Should you ever need to shut down your furnace for service
or maintenance, you will need to turn the furnace off. The
following procedures must be followed:
1. Set your room thermostat to the lowest temperature
setting. (See Fig. 17.)
®
2. Close the external manual gas valve (See Fig. 9.)
3. Turn off electrical supply to the furnace. (See Fig. 18.)
4. Remove main furnace door. (See Fig. 11.)
5. Turn the switch on the gas valve to the OFF position. (See
Fig. 19.)
6. Replace the main furnace door. (See Fig. 14.)
7. If the furnace is being shut down because of a malfunc-
tion, call your dealer as soon as possible.
Furnace is not to be installed, operated, and then
turned off and left turned off in an unoccupied
structure during winter. (See winterizing proce-
dures in maintenance section). Freeze damage to
furnace could occur.
PERFORMING ROUTINE
MAINTENANCE
NOTE: The qualified installer or agency must use only
factory-authorized replacement parts, kits, and accessories
when modifying this product.
Installing and servicing heating equipment can be hazard-
ous due to gas and electrical components. Only trained and
qualified personnel should install, repair, or service heating
equipment.
Untrained personnel can perform basic maintenance func-
tions such as cleaning and replacing air filters. All other
operations must be performed by trained service person-
nel. Observe safety precautions in this manual, on tags, and
17
on labels attached to the furnace, and other safety precautions
that may apply.
With proper maintenance and care, your furnace will operate
economically and dependably. Instructions for basic mainte-
nance are found on this and the following pages. However,
before beginning maintenance, follow these safety precautions:
Turn off electrical power supply to your furnace
before removing the access doors to service or
perform maintenance. A failure to follow this
warning could result in personal injury or death.
18
6
OR
CAUTION
!
WARNING
!
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