3
UNIT ARRANGEMENT AND ACCESS
General
Figures 1 and 2 show the general unit arrangement and access
locations.
Fig. 1 — Access Panels and Components, Front
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 48TC 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
• 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 a 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.
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 fil-
ters 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.
IMPORTANT: Lockout/tag-out is a term used when electrical
power switches are physically locked, preventing power to the
unit. A placard is placed on the power switch alerting service
personnel that the power is disconnected.
OUTDOOR AIR
HOOD
CONTROL BOX
ACCESS PANEL
RETURN AIR
FILTER AND
INDOOR COIL
ACCESS PANEL
SUPPLY FAN
HEATING SECTION
GAS SECTION
ACCESS PANEL
OUTDOOR
FANS/MOTORS
DISCONNECT
CONVENIENCE
OUTLET
COMPRESSOR
(CIRCUIT A)
CONDENSER
COIL
(CIRCUIT A)
CONDENSER COIL
CIRCUIT A
CONDENSER COIL
CIRCUIT B
COMPRESSOR
CIRCUIT B
CAUTION
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.
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