Unit Arrangement And Access - Carrier 48TC 17 Series Service And Maintenance Instructions

UNIT ARRANGEMENT AND
ACCESS
General
Fig. 1 and Fig. 2 show general unit arrangement and
access locations.
SUPPLY FAN
HEATING SECTION
OUTDOOR AIR
HOOD
DISCONNECT
CONVENIENCE
OUTLET
CONTROL BOX
RETURN AIR
ACCESS PANEL
FILTER AND
INDOOR COIL
ACCESS PANEL
Fig. 1 − Access Panels and Components, Front
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 initial start)
The 48TC units should be inspected and serviced every
three months.
S Return air filter replacement
S Outdoor hood inlet filters cleaned
S Belt tension checked
S Belt condition checked
S Pulley alignment checked
S Fan shaft bearing locking collar tightness checked
S Condenser coil cleanliness checked
S Condensate drain checked
OUTDOOR
FANS/MOTORS
CONDENSER
COIL
(CIRCUIT A)
COMPRESSOR
GAS SECTION (CIRCUIT A)
ACCESS PANEL
C12560
COMPRESSOR
CIRCUIT B
C09505
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
S Condenser fan motor mounting bolts tightness
S Compressor mounting bolts
S Condenser fan blade positioning
S Control box cleanliness and wiring condition
S Wire terminal tightness
S Refrigerant charge level
S Evaporator coil cleaning
S Evaporator blower motor amperage
Heating
S Heat exchanger flue passageways cleanliness
S Gas burner condition
S Gas manifold pressure
S Heating temperature rise
Economizer or Outside Air Damper
S Inlet filters condition
S Check damper travel (economizer)
S 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 economizer, 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 replaced 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.)
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 on heat exchangers and coils can cause
excessive current use, resulting in motor failure.
3