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B. Ventilation Sequence
If unit is equipped with economizer or accessory two-position
damper, the damper will open to the minimum position when-
ever the evaporator fan runs.
Whenever the evaporator fan is energized (during heating,
cooling, or continuous fan), 24-v power is on terminal R1 on
the economizer control board or terminal no. 1 on R1 on the
two-position damper wiring harness. The damper motor will
be energized with power and the damper will drive open un-
til SW3 on the damper is deactivated. The damper motor will
stop, and damper will remain in the minimum ventilation po-
sition until the evaporator fan is shut off. When the evapo-
rator fan is shut off, the damper motor is again energized and
the damper runs closed until SW2 is activated and the damper
motor turns off.
CARE AND MAINTENANCE
To ensure continuing high performance, and to minimize the
possibility of premature equipment failure, periodic mainte-
nance must be performed on this equipment. This combina-
tion heating/cooling unit should be inspected at least once each
year by a qualified service person.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
WARNING: The ability to properly perform mainte-
nance on this equipment requires certain expertise, me-
chanical skills, tools, and equipment. If you do not pos-
sess these, do not attempt to perform any maintenance
on this equipment other than those procedures recom-
mended in the User's Information Manual. FAILURE
TO HEED THIS WARNING COULD RESULT IN SE-
RIOUS PERSONAL INJURY AND POSSIBLE DAM-
AGE TO THIS EQUIPMENT.
The minimum maintenance requirements for this equipment
are as follows:
1. Inspect air filters each month. Clean or replace when
necessary.
2. Inspect cooling coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean when necessary.
3. Inspect fan motor and wheel. Clean and lubricate as
necessary.
4. Check electrical connections for tightness and controls
for proper operation each heating and cooling season.
Service when necessary.
5. Check and inspect accessory electric heaters before each
heating season. Clean and adjust when necessary.
6. Check and clean outdoor-air inlet screen if needed.
WARNING: Failure to follow these warnings could re-
sult in serious personal injury:
1. Turn off electrical power to the unit before per-
forming any maintenance or service on the unit.
2. Use extreme caution when removing panels and
parts. As with any mechanical equipment, per-
sonal injury can result from sharp edges, etc.
3. Never place anything combustible either on, or in
contact with, the unit.
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 Table 1 for recommended fil-
ter sizes.
Inspect air filters 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.
When necessary, replace filters with the same dimensional
size and type as originally provided.
CAUTION: When servicing unit, shut off all electri-
cal power to unit to avoid shock hazard or injury from
rotating parts.
I. CLEANING
Inspect unit interior at the beginning of each heating and cool-
ing season and as operating conditions require.
A. Evaporator Coil
1. Turn unit power off. Remove evaporator coil access panel.
2. If economizer or two-position damper is installed, re-
move economizer or two-position damper by disconnect-
ing economizer plug and mounting screws. See Fig. 15
and 21. Refer to Factory-Installed Optional Economizer
sections, on page 13 or Accessory Economizer or Two-
Position Damper Installation Instructions for further
details.
3. Slide filters out of unit.
4. Clean coil using a commercial coil cleaner or dish-
washer detergent in a pressurized spray canister. Wash
both sides of coil and flush with clean water. For best
results, backflush toward return-air section to remove
foreign material.
5. Flush condensate pan.
6. Reinstall economizer and filters.
7. Reconnect wiring.
8. Replace access panels.
B. Condenser Coil
Inspect coil monthly. Clean condenser coil annually, and as
required by location or outdoor-air conditions.
One-Row Coils (size 036)
Wash coil with commercial coil cleaner. It is not necessary to
remove top panel.
2-Row Coils (sizes 048-072)
NOTE: Save all screws removed in this section. The screws
must be used when reinstalling the equipment.
1. Turn off unit power.
2. Remove top panel screws on condenser end of unit.
3. Remove condenser coil corner post. See Fig. 28. To hold
top panel open, place coil corner post between top panel
and center post. See Fig. 29.
—29—
SERVICE
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