Carrier 58DX - Manual (Page 7)

in terroinal block/speed selector located on the blower hous­
ing. Check the temperature rise. It must be within the limits
specified on the unit rating plate.
C. Automatic Gas Control Valve
These units are equipped with an automatic gas control
valve. Check the proper operation of this valve by moving
the room thermostat pointer above and below the room tem­
perature and observe that the main burners light when the
pointer is above and go off when the pointer is below the
room temperature setting.
XI. CARE AND MAINTENANCE
A CAUTION
Because of possible damage to the equipment or per­
sonal injury, maintenance should be performed by qual­
ified persons only.
A WARNING
Never store any flammables, chloride, or halogen-
containing compounds near, or in contact with, the fur­
nace. A failure to adhere to this warning can cause a
fire, personal injury, or death.
For continuing high performance, and to minimize equip­
ment failure, it is essential that periodic maintenance be
performed on this equipment. Consult your local Dealer as
to the proper frequency of maintenance and the availability
of a maintenance contract.
A WARNING
The abihty to properly perform maintenance on this
equipment requires certain expertise, mechanical skills,
tools, and equipment. If you do not possess these, do
not attempt to perform any maintenance on this equip­
ment other than those procedures recommended in the
Users Manual. A FAILURE TO ADHERE TO THIS
WARNING COULD RESULT IN SERIOUS PER­
SONAL INJURY AND POSSIBLE DAMAGE TO
THIS EQUIPMENT.
A WARNING
Turn off gas and electrical supply to the unit before per­
forming any maintenance or service on the unit. FoUow
the operating instructions attached to the furnace. A
failure to adhere to this warning can cause personal
injury.
The niinimum maintenance that should be performed on
this equipment is as follows;
1. Check and clean or replace air filter each month or as
required.
2. Check blower motor and wheel for cleanliness and lubri­
cation each heating and cooling season. Clean and
lubricate as necessary. (See Section XI, B.)
3. Check electrical connections for tightness and controls
for proper operation each heating season. Service as
necessary.
4. Check for proper condensate drainage.
5. Check for blockages of combustion-air and vent pipes.
A WARNING
As with any mechanical equipment, personal injury can
result from sharp metal edges, etc.; therefore, be careful
when removing parts.
A. Air Filter
Remember to disconnect electrical power before removing
access panels. To clean or replace the air filter, proceed as
follows:
1. Remove blower access panel.
2. Reach up behind top plate, tilt filters toward center of
return-air plenum, remove filters. See Fig. 9.
3. Clean filter with cold tap water. Spray in direction op­
posite to airflow.
4. Rinse and let dry. DO NOT oil or coat filter.
5. Place dry filter in furnace with cross-hatch binding fac­
ing blower.
B. Blower Motor and Wheel
For long Ufe, economy, and high efficiency; clean accumu­
lated dirt emd grease from blower wheel and motor amnually.
The following steps should be performed by a qualified
serviceperson, or agency.
> Some motors have prelubricated sealed bearings and require
no lubrication. These motors can be identified by the
absence of oil ports on each end of the motor. For those
motors with oil ports lubricate as follows:
Lubricate motor every 5 years if motor is used on intermit­
tent operation (thermostat FAN switch in AUTO position),
or every 2 years if motor is in continuous operation (thermo­
stat FAN switch in ON position).
Remember to disconnect electrical supply before removing
access panels.
Clean and lubricate as follows:
1. Remove access panels.
2. Remove vent pipe enclosure from top side of blower
shelf and position out of way.
3. Note location of wires for reassembly, then remove
electrical leads from numbered side of blower speed
selector. See Table 5.
4. Loosen hose clamps on outlet elbow and remove elbow.
5. Loosen hose clamp on extension pipe outside of furnace
and remove pipe.
6. Remove screws securing blower assembly to blower
shelf and slide blower assembly out of furnace.
7. Squeeze side tabs of blower speed selector and puU
from blower housing bracket.
8. Loosen screw in strap holding motor capacitor to
blower housing and shde capacitor from strap.
9. Mark blower wheel location on shaft to insure proper
reassembly.
10. Loosen setscrew holding blower wheel on motor shaft.
11. Remove bolts holding motor mount to blower housing
and slide motor and mount out of housing. Disconnect
ground wire attached to blower housing before remov­
ing motor.
►12. Lubricate motor (when oilers are provided).
a. Remove dust caps or plugs from oil ports located at
each end of motor. If motor does not have these
caps or plugs, bearings are sealed emd need no fur­
ther lubrication.
b. Use a good grade of SAE 20 nondetergent motor oil