Carrier 48VL-A - Manual (Page 5)

Fans and Fan Motors
Periodically check the condition of fan wheels and housings and
fan motor shaft bearings. Contact your dealer for the required
annual maintenance.
Pleat Exchanger
To ensure dependable and efficient heating operation, the heat
exchanger should be checked by a qualified maintenance person
before each heating season, and cleaned when necessary. This
checkout should not be attempted by anyone not having the
required expertise and equipment to properly do the job. Contact
your dealer for the required periodic maintenance.
Indoor and Outdoor Coils
Cleaning of the coils should only be done by qualified service
personnel.
Contact your dealer for the required annual
maintenance.
Condensate Drain
The drain pan and condensate drain line should be checked and
cleaned at the same time the cooling coils are checked by your
dealer.
Compressor
All compressors are factory shipped with a normal charge of the
correct type of refrigeration grade oil, A compressor should rarely
require additional oil.
Condenser fOutdoor! Fan
WARNING
PERSONAL
HAZARD INJURY AND UNIT DAMAGE
Failure to follow this warning could result
injury, death or property damage. in personal
Do not insert sticks, screwdrivers, or any other objects into
revolving fan blades.
The fan must be kept free of all obstructions to ensure proper
cooling. Contact your dealer for any required service.
Electrical Controls and Wiring
Electrical controls are difficult to check without proper
instrumentation. If there are any discrepancies in the operating
cycle, contact your local dealer and request service.
Refrigerant Circuit
The refrigerant circuit is difficult to check for leaks without the
proper equipment. If inadequate cooling is suspected, contact your
local dealer for service.
A WARNING
EXPLOSION AND ENVIRONMENTAL HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
System under pressure. Relieve pressure and recover all
refrigerant before system repair or final unit disposal. Use
all service ports and open all flow-control devices,
including solenoid valves.
to the area in which the furnace is installed, and the spacing around
the furnace must not be blocked or obstructed.
The combustion area and vent system should be inspected visually
before each heating season. The normal accumulation of dirt, soot,
rust, and scale can result in loss of efficiency and improper
performance if allowed to build up. This inspection should be done
by a trained service person.
A. WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
If your unit makes an especially loud noise when the main
burners are ignited, shut down the heating section and call
your dealer,_________________________________________
A. CAUTION
BURN HAZARD
Failure to follow this caution may result in personal injury.
Components in heating section may be hot after unit has
been started up. When observing flame, be careful not to get
close to or touch heating components.
Regular Dealer Maintenance
In addition to the type of routine maintenance you might be willing
to perform, your unit should be inspected regularly by a properly
trained service technician. An inspection (preferably each year, but
at least every other year) should include the following:
1, Inspection of all flue product passages-including the burn­
ers, heat exchanger, and flue collector box, Mare sure the
burner flames are blue in color and in proper adjustment.
Refer to Fig, 9 for burner flame,
2, Inspection of all combustion-and ventilation-air passages
and openings,
3, Close inspection of all gas pipes leading to and inside of
your unit,
4, Inspection and, if required, cleaning of the outdoor and
indoor coils,
3, Inspection and, if required, cleaning of the indoor coil con­
densate drain pan.
Unit Panels
After performing any maintenance or service on the unit, be sure
all panels are fastened securely in place to prevent rain from
entering unit cabinet and to prevent disruption of the correct unit
airflow pattern.
Combustion Area and Vent System
For proper and safe operation, the furnace needs air for combustion
and ventilation. The air openings, on the furnace, the air openings