Carrier Furnace - Manual (Page 50)

Comfort Fan™ - On all but the base series furnace, 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 for f to 3 seconds (or AUTO depending on
your thermostat), and then return to ON. The blower will switch to
the next higher speed. There are at least three 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 need to shut down your furnace for service or
maintenance, you will need to turn the furnace off. The following
procedures must be followed:
f. Set your room thermostat to the lowest temperature setting
and set the “MODE” to “OFF,” See Fig. 16,
2, Close the external manual gas valve. See Fig. 17,
Fig. 17 - Close the External Manual Valve
3, Turn off electrical supply to the furnace. See Fig. 18,
4, Remove main furnace door. See Fig. 10,
3, Turn control switch on the gas control to OFF position. See
Fig. 19,
SINGLE-STAGE GAS CONTROL TWO STAGE GAS CONTROL
Fig. 19 - Control Switch to OFF
6, Replace main furnace door. See Fig. 13,
7, If the furnace is being shut down because of a malfunction, call
your dealer as soon as possible.
A. CAUTION
UNIT AND PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in unit component or
property damage.
Furnace is not to be installed, operated, and then turned off
and left turned off in an unoccupied structure during winter.
See “Winterization” procedures in this manual.
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 of heating equipment can be hazardous due
to gas and electrical components.
Only trained and qualified personnel should install, repair, or
service heating equipment. Untrained personnel can perform basic
maintenance functions such as cleaning and replacing air filters.
All other operations must be performed by trained service
personnel. Observe safety precautions in this manual, on tags, and
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 maintenance
are found on this and the following pages. However, before
beginning maintenance, follow these safety precautions:
Fig. 18 - Turn Off Electrical Supply
^ WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Turn off electrical power supply to your furnace and
install lockout tag before removing the access doors to
service or perform maintenance.