Carrier 58VCA - Manual (Page 7)

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A86035
NOTE: If the pilot fails to ignite within 5 minutes (twice), the
furnace control system will lockout. If lockout occurs, the main
burners fail to light, or the blower doesn’t come on, shut down
your furnace and call your dealer for service.
12. Set your thermostat to the temperature that satisfies your
comfort requirements. SUGGESTION: Setting the ther­
mostat back a few degrees—and compensating for the dif­
ference with warmer clothing—can make a big difference
in your fuel consumption on extremely cold days. 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 be switched on
automatically. When the room temperature reaches the
degree selected on the thermostat, the furnace will be au­
tomatically switched off.
Some thermostats have a “fan” switch with 2 selections:
AUTO or ON. When set on AUTO, the furnace blower cy­
cles on and off, controlled by the thermostat. In the ON
position, the furnace blower runs continuously. This
keeps the temperature level in your home more evenly bal­
anced. It also continuously filters the indoor air.
SHUTTING DOWN YOUR FURNACE
Should you need to shut down your furnace for service or main­
tenance, you will need to turn the furnace off. The following
procedures must be followed:
1. Set your room thermostat to the lowest temperature set­
ting. (See Fig. 18.)
2. Close the external manual gas valve. (See Fig. 9.)
3. TUrn OFF the electrical power to your furnace. (See
Fig. 19.)
4. Remove the control access door on your furnace. (See
Fig. 11 or 12.)
5. TUrn the control knob on the gas valve to the OFF position.
(See Fig. 20.)
6. Replace the control access door. (See Fig. 14 or 15.)
7. If the furnace is being shut down because of a malfunction,
call your dealer as soon as possible.
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A CAUTION
Furnace is not to be installed, operated, and then turned off
and left turned off in an unoccupied structure during win­
ter. (See winterizing procedures in maintenance section).
PERFORMING ROUTINE MAINTENANCE
With proper maintenance and care, your furnace will operate
economically and dependably. Instructions for basic mainte­
nance, which can easily be followed, are found on this and the
following pages. However, before beginning maintenance, fol­
low these safety precautions:
A WARNING
TUrn OFF electrical power supply to your furnace before re­
moving the access doors to service or perform maintenance.
Failure to follow this warning could result in personal in­
jury or death.
A CAUTION
Although special care has been taken to minimize sharp
edges, be extremely careful when handling parts or reach­
ing into the furnace.
FILTERING OUT TROUBLE
A dirty filter will cause a loss of airflow in your duct system; the
microprocessor will detect an airflow change and compensate
for slight variations. When the microprocessor cannot compen­
sate for the excessive loss of airflow, a blower calibration fault
will be signaled and the furnace will operate only in the low-
heat mode. If this condition is left unattended, the furnace will
eventually lockout. It is recommended that the furnace filter be
checked every 3 or 4 weeks and cleaned if necessary.
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