Table of Contents
Advertisement
CONDENSER COIL
CIRCUIT A
CONDENSER COIL
CIRCUIT B
Fig. 2 — Typical Access Panel Locations, Rear
Routine Maintenance
These items should be part of a routine maintenance program, to
be checked every month or two, until a specific schedule for each
can be identified for this installation:
QUARTERLY INSPECTION (AND 30 DAYS AFTER INI-
TIAL START)
The 551J units should be inspected and serviced every three
months.
•
Return air filter replacement
•
Outdoor hood inlet filters cleaned
•
Belt tension checked
•
Belt condition checked
•
Pulley alignment checked
•
Fan shaft bearing locking collar tightness checked
•
Condenser coil cleanliness checked
•
Condensate drain checked
Seasonal Maintenance
These items should be checked at the beginning of each season (or
more often if local conditions and usage patterns dictate):
AIR CONDITIONING
•
Condenser fan motor mounting bolts tightness
•
Compressor mounting bolts
•
Condenser fan blade positioning
•
Control box cleanliness and wiring condition
•
Wire terminal tightness
•
Refrigerant charge level
•
Evaporator coil cleaning
•
Evaporator blower motor amperage
HEATING
•
Heat exchanger flue passageways cleanliness
COMPRESSOR
CIRCUIT B
•
Gas burner condition
•
Gas manifold pressure
•
Heating temperature rise
ECONOMIZER OR OUTSIDE AIR DAMPER
•
Inlet filters condition
•
Check damper travel (economizer)
•
Check gear and dampers for debris and dirt
AIR FILTERS AND SCREENS
Each unit is equipped with return air filters. If the unit has an econ-
omizer, it will also have an outside air screen. If a manual outside
air damper is added, an inlet air screen will also be present.
Each of these filters and screens will need to be periodically re-
placed or cleaned.
RETURN AIR FILTERS
Return air filters are disposable fiberglass media type. Access to
the filters is through the small lift-out panel located on the rear
side of the unit, above the evaporator/return air access panel. (See
Fig. 1.)
EQUIPMENT DAMAGE HAZARD
Failure to follow this CAUTION can result in premature wear
and damage to equipment.
DO NOT OPERATE THE UNIT WITHOUT THE RETURN
AIR FILTERS IN PLACE.
Dirt and debris can collect on heat exchangers and coils possi-
bly resulting in a small fire. Dirt buildup on components can
cause excessive current used resulting in motor failure.
Removing the Return Air Filters
1.
Remove the return air filter and indoor coil access panel.
See Fig. 1.
2.
Reach inside and remove filters from the filter rack.
3.
Replace these filters as required with similar replacement
filters of same size.
4.
Re-install the return air filter and indoor coil access panel.
OUTDOOR AIR HOOD
Outside air hood inlet screens are permanent aluminum-mesh type
filters. See Fig. 2. Inspect these screens for cleanliness. Remove
the screens when cleaning is required. Clean by washing with hot
low-pressure water and soft detergent and replace all screens be-
fore restarting the unit. Observe the flow direction arrows on the
side of each filter frame.
Economizer Inlet Air Screen
This air screen is retained by spring clips under the top edge of the
hood. (See Fig. 3.)
Remove screens by removing the screws in the horizontal clips on
the leading edge of the hood. Slide the filters out. See Fig. 3.
Install the filters by sliding clean or new filters into the hood side
retainers. Once positioned, re-install the horizontal clips.
3
CAUTION
Advertisement
Table of Contents
Troubleshooting
