Carrier 48GH - Manual (Page 18)

Note to Equipment Owner: Consult your local
dealer about the availability of a maintenance
contract.
WARNING; The ability to properly perform
maintenance on this equipment require? cer­
tain expertise, mechanical skills, tools and
equipment. If you do not possess these, do
not attempt to perform any maintenance on
this equipment other than those procedures
recommended in the Owner^^ Manual. A
FAILURE TO BEED THIS WARNING
COULD RESULT IN SERIOUS PERSONAL
INJURY AND EQUIPMENT DAMAGE.
The minimum maintenance requirements for
this equipment are as follows:
1. Inspect air filter(s) 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 blower motor and wheel for cleanliness
and check lubrication each heating and cooling
season. Clean and lubricate when necessary
4. Check electrical connections for tightness and
controls for proper operation each heating and
cooling season. Service when necessary.
5. Check and inspect heating section before each
heating season. Clean and adjust when necessary.
WARNING: .A failure to follow these warnings
could result in serious personal injury:
1. Turn off gas supply, then diseonnea ekc~
trkal power to the unit before performing
any maintenance or service,
2. Use extreme caution when removing panels
and parts. As with any mechanical equip­
ment- personal injury' can result from sharp
edges, etc.
3. Never place anything combustible either on,
or in contact with, the unit.
Top Removal
W.ARNING: When retnoving unit top, use
extreme caution to protect seal that isolates heat
exchanger and flue products from other sec­
tions. Removal of top must never be attempted
by anyone other than qualified technicians.
CAUTION; Condenser fan and motor are
fastened to unit top. When removing top, use
extreme care to not pull fan motor leads loose.
NOTE: When performing maintenance or service
procedures that require removal of unit top, be sure
to perform all routine maintenance procedures
that require top removal, including: inspection of
heat exchanger area, coil inspection and cleaning,
and condensate drain pan inspection and cleaning.
When performing maintenance and service
procedures that require unit top removal, refer to
the following top removal procedures:
1. Turn off gas supply, then disconnect electric
power to unit.
2. Remove vent cap and combustion-air assem­
blies. Do not damage gasket. (Refer to Venting
section and reverse assembly procedures shown.)
3. Remove all screws that secure unit top, including
screws around 4 sides and those on top that screw
into internal divider panels. Save all screws.
4. Tape all side panels at each seam near unit top.
Use tape strips that are at least 5 in. long to pre­
vent sides from falling when top is removed.
5. Carefully lift top from unit. Set top on edge and
ensure that it is supported by unit side that is
opposite duct (or plenum) side. Use extreme care
to prevent damage to the seal that isolates heat
exchanger and flue products or the fan blades,
motor, and insulation.
6. Carefully replace and secure top to unit using
screws removed in step 3 when maintenance
and/or service procedures are concluded. (Be
sure to use original screws that have rubber
washers to seal out water when securing top to
internal divider panels.)
7. Reinstall vent cap and combustion-air assem­
blies. (Refer to Venting section.)
Air Filter
C.AUTION: Never operate «nit without a suit­
able air filter in retura-air duct system. Always
replace filter with same sire and type. See
Table 1 for recommended filter sizes.
Inspect air filter(s) at least once each month and
replace (disposable-type) or clean (cleanable-type)
at least twice during each heating and cooling season
or whenever the filter(s) becomes clogged with dust
or lint.
Models 48GH/GL do not have factory-supplied
air filters. Field-supplied air filter(s) may be
either disposable or cleanable. Remove access door
on return-air inlet side of plenum to gain access to
filters. See Fig. 1. Replace these filters with same
size and type when necessary.
Evaporator Blower Wheel and Motor
— For
longer life, operating economy and continuing
efficiency, clean accumulated dirt and grease from
blower wheel and motor annually.
Fabricate motor every 5 years if motor is used
intermittently (thermostat fan switch in AUTO,
position), or every 2 years if motor is used con­
tinuously (thermostat fan switch in ON position).
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