Air Filter; Unit Top Removal; Indoor Blower And Motor; Cooling Charge Chart - Carrier 50ZH Series Installation, Start-Up And Service Instructions Manual

The ability to properly perlbrn_ maintenance on this equip-
ment requires certain expertise, mechanical skills, tools and
equipment. If you do not possess these, do not attempt to
perlbrn_ any maintenance on this equipment, other than those
procedures recommended in the User's Manual. FAILURE
TO HEED THIS WARNING COULD RESULT IN SERI-
OtIS 1NJURY, DEATH OR DAMAGE TO THIS EQUIP-
MENT.
The minilnum maintenance requirements %r this equipment are as
lollows:
1. Inspect air filter(s) each month. Clean or replace when
necessary.
2. Inspect indoor coil, outdoor coil, drain pan, and condensate
drain each cooling and heating season lbr cleanliness. Clean
when necessary.
3. Inspect blower motor and wheel lot cleanliness each cooling
and heating season. Clean when necessary. For l]rst heating
season, inspect blower wheel bimonthly to determine proper
cleaning [?'equency.
4. Check electrical connections lbr tightness and controls lk_r
proper operation each cooling season. Service when neces-
sary.
5. Check the drain channel ilk the top cover periodically %r
blockage (leaves, insects). Clean as needed.
Failure to lollow these warnings could result in serious injury
or death:
1. Turn off electrical power to the unit and install lockout tag
beli_re perlorming any maintenance or service on the unit.
2. Use extreme caution when removing panels and parts. As
with any mechanical equipment, personal injury can result
15"oresharp edges, etc.
3. Never place anything combustible either on, or ilkcontact
with, the unit.
Step 1--Air Filter
NOTE: Never operate the unit without a suitable air lilter ilkthe
return-air duct system. Always replace the l]lter with the same size
as originally installed. See Table 1 lor recommended filter sizes
Inspect air filter(s) at least once each month and replace
(throwaway-type) or clean (cleanable-type) at least twice during
each cooling season or whenever the filters become clogged with
dust and lint.
Replace filters with the same dimensional size and type as
originally provided, when necessary.
Step 2--Unit Top Removal (Outdoor-Coil Side)
NOTE: When perli}rming maintenance or service procedures that
require removal of the unit top, be sure to per%rm all of the routine
maintenance procedures that require top removal, including coil
inspection and cleaning, and condensate drain pan inspection and
cleaning.
Disconnect and tag electrical power to the unit belk}re
removing top. Failure to adhere to this warning could cause
serious injury or death.
Only qualified service personnel should perlorm maintenance and
service procedures that require unit top removah
Reli:r to the lbllowing top removal procedures:
1. Remove 7 screws on unit top cover surface. (Save all screws.)
2. Remove 2 screws on unit top cover flange. (Save all screws.)
3. Lift top l?'om unit carefully. Set top on edge and make sum
that top is supported by unit side that is opposite duct (or
plennm) side.
4. Carefully replace and secure unit top to uniL using screws
removed ilk steps 1 and 2 above, when maintenance and/or
service procedures are completed.
Step 3--indoor Blower and Motor
For hmger lili:, operating economy, and continuing efficiency,
clean accunmlated dirt and grease l?'om the blower wheel and
motor annually.
Disconnect and tag electrical power to the unit bel_re
cleaning the blower wheel. Faihn'e to adhere to this warning
could cause serious injury or death.
To clean the blower wheel:
1. Access the blower assembly as lollows:
a. Remove top access panel.
b. Remove 3 screws that hold blower orifice ring to blower
housing. Save screws.
c. Loosen setscrew(s) which secure wheel to motor shaft.
2. Remove and clean blower wheel as lollows:
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30 40 50 60 70 80 90
SUCT!ON L!NE TEM PERATURE (°F)
I I I I I I I
-1 4 10 16 21 27 32
SUCTION LINE TEMPERATURE (°C)
Fig. 18--Cooling Charging Chart--5OZH030 c°°_63
16