4. Check electrical connections for tightness and controls
for proper operation each heating and cooling season.
Service when necessary.
5. Check and inspect heating section before each heating
season. Clean and adjust when necessary.
6. Check flue hood and remove any obstructions if
necessary.
I. AIR FILTER
CAUTION:
Never operate the unit without a suit-
able air filter in the return-air duct system. Always re-
place the filter with the same dimensional size and type
as originally installed. See Tables 1 and 2 for recom-
mended filter sizes.
Inspect air filter(s) at least once each month and replace
(throwaway-type) or clean (cleanable-type) at least twice dur-
ing each heating and cooling season or whenever the filter(s)
becomes clogged with dust and lint.
II. EVAPORATOR BLOWER AND MOTOR
NOTE:
All motors are prelubricated. Do not attempt to lu-
bricate these motors.
For longer life, operating economy, and continuing efficiency,
clean accumulated dirt and grease from the blower wheel and
motor annually.
WARNING:
Turn off the gas supply, then disconnect
and tag electrical power to the unit before cleaning and
lubricating the blower motor and wheel. Failure to ad-
here to this warning could cause personal injury or death.
To clean the blower motor and wheel:
1. Remove and disassemble blower assembly as follows:
a. Remove unit access panel.
b. Disconnect motor lead from blower relay (BR).
Disconnect yellow lead from terminal L2 of the
contactor.
c. On all units remove blower assembly from unit. Re-
move screws securing blower to blower partition and
slide assembly out. Be careful not to tear insulation
in blower compartment.
d. Ensure proper reassembly by marking blower wheel
and motor in relation to blower housing before
disassembly.
e. Loosen setscrew(s) that secures wheel to motor shaft,
remove screws that secure motor mount brackets to
housing, and slide motor and motor mount out of
housing.
2. Remove and clean blower wheel as follows:
a. Ensure
proper
reassembly
by
marking
wheel
orientation.
b. Lift wheel from housing. When handling and/or clean-
ing blower wheel, be sure not to disturb balance weights
(clips) on blower wheel vanes.
c. Remove caked-on dirt from wheel and housing with
a brush. Remove lint and/or dirt accumulations from
wheel and housing with vacuum cleaner, using soft
brush attachment. Remove grease and oil with mild
solvent.
d. Reassemble wheel into housing.
e. Reassemble motor into housing. Be sure setscrews are
tightened on motor shaft flats and not on round part
of shaft.
f. Reinstall unit access panel.
3. Restore electrical power, then gas supply to unit. Start
unit and check for proper blower rotation and motor speeds
during heating and cooling cycles.
III. FLUE GAS PASSAGEWAYS
To inspect the flue collector box and upper areas of the heat
exchanger:
1. Remove the combustion blower wheel and motor assem-
bly according to directions in Combustion-Air Blower sec-
tion below.
2. Remove the 3 screws holding the blower housing to the
flue collector box cover (see Fig. 31).
3. Remove the 12 screws holding the flue collector box cover
(Fig. 31) to the heat exchanger assembly. Inspect the heat
exchangers.
4. Clean all surfaces as required using the wire brush.
IV. COMBUSTION-AIR BLOWER
Clean periodically to assure proper airflow and heating effi-
ciency. Inspect blower wheel every fall and periodically dur-
ing heating season. For the first heating season, inspect blower
wheel bimonthly to determine proper cleaning frequency.
To inspect blower wheel, remove draft hood assembly. Shine
a flashlight into opening to inspect wheel. If cleaning is re-
quired, remove motor and wheel as follows:
1. Remove unit access panel. (See Fig. 32.)
2. Remove the 7 screws that attach induced-draft motor
mounting plate to blower housing. (See Fig. 31.)
3. Slide the motor and blower wheel assembly out of the
blower housing. (See Fig. 33.) Clean the blower wheel.
If additional cleaning is required, continue with Steps 4
and 5.
4. To remove blower, remove 2 setscrews. (See Fig. 33.)
5. To remove motor and cooling fan assembly, remove
4 screws that hold blower housing to mounting plate.
6. To reinstall, reverse the procedure outlined above.
V. LIMIT SWITCH
Remove unit access panel. Limit switch is located on the blower
partition.
Fig. 31 — Blower Housing and Flue Collector Box
—30—
Summary of Contents for 582A Series
Page 26: ...Fig 29 Cooling Charging Chart 583A048 Units Fig 30 Cooling Charging Chart 583A060 Units 26 ...
Page 36: ......
Page 37: ......
Page 39: ......
