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The ambistat switch contacts will close again when
the chilled water supply temperature rises to 42°F.
The energized gas valve turns the gas on again.
X. MAINTENANCE
Cleaning the'Heating Unit.
1. Be sure that the main line disconnect switch is in
the OFF position.
TAG SWITCH WITH A SUITABLE WARNING
LABEL.
2. Remove the front access panel.
3. Turn off the manual gas valve and the pilot valve.
4. Disconnect the pilot and escapement tubing.
5. Remove the burners.
6. Remove the flue baffle retainer and the flue baf¬
fles.
7. Clean the flue passages with a suitable brush.
8. Reassemble the furnace by reversing the above
procedure, making sure all seals are reinstalled
properly.
9. Check belt conditions and proper tension of belt
(approximately 1/2 inch deflection).
10. Filters in the 180-479 are of the disposable type
and should be inspected periodically and replaced
when dirty with filters of the same type and size.
Filters in the 240-479 are permanent type filters and
should be cleaned periodically. Make sure the arrows
on the edge of the filter point in the direction of the
airflow.
Lubrication
Some blower motors are equipped with permanent
lubricated
bearings
and
require
no
further
lubrication.
Blower motors that require lubrication are equipped
with oil cups. Oil motor bearings with SAE 10-20 non¬
detergent oil each heating and cooling season.
NOTE: BLOWER BEARINGS ARE OF THE PER¬
MANENT LUBRICATED TYPE AND DO NOT
REQUIRE ANY FURTHER OILING.
Cleaning the Condenser Coil
The condenser coil fin surfaces should be inspected
from time to time and cleaned as necessary. Cleaning
may be accomplished by washing the fins with low
pressure water from a garden hose. Detergent may be
used, prior to rinsing, when oil or grease has coated
the fin surfaces. Care must be taken to be sure that
the soft aluminum fins are not bent.
WARNING: Disconnect the electric power before
cleaning the cooling coil.
Summer Chiller Operation
It may be necessary to drain, flush and refill the
chilled water system of each chiller with tap water if
antifreeze was used for winter protection. A high an¬
tifreeze concentration will result in a reduction of the
cooling capacity of the unit.
Be sure to add one package of Chilled Water Additive
P/N 62875D1 to the chiller tank of each chiller of
Model 180-479 or the Model 240-479 when water only
is used in the chilled water system for summer
operation.
10
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