Maintenance; Air Filter; Indoor Blower And Motor; Outdoor Coil, Indoor Coil, And Condensate Drain - Carrier 50JZ Installation, Start-Up And Service Instructions Manual

line or remainder of defrost cycle time up to a maximum defrost
time of 10 minutes.
5. Turn off power tag disconnect to outdoor and reconnect fan
motor lead to OF2 on control board after above forced defrost
cycle.

MAINTENANCE

To ensure continuing high performance, and to minimize the
possibility of premature equipment failure, periodic maintenance
must be performed on this equipment. This heat pump unit should
be inspected at least once each year by a qualified service person.
To troubleshoot unit, refer to Troubleshooting Chart at the end of
these instructions.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
The ability to properly perform maintenance on this equip-
ment requires certain 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 User's Manual. FAILURE
TO HEED THIS WARNING COULD RESULT IN SERI-
OUS INJURY OR DEATH AND POSSIBLE DAMAGE TO
THIS EQUIPMENT.
Failure to follow these warnings could result in serious injury
or death:
1. Turn off electrical power to the unit and install lockout tag
before performing any maintenance or service on this unit.
2. Use extreme caution when removing panels and parts. As
with any mechanical equipment, personal injury can result
from sharp edges.
3. Never place anything combustible either on, or in contact
with, the unit.
Errors made when reconnecting wires may cause improper
and dangerous operation. Label all wires prior to disconnect-
ing when servicing.
The minimum maintenance requirements for this equipment are as
follows:
1. Inspect air filter(s) each month. Clean or replace when
necessary.
2. Inspect indoor coil, drain, and condensate drain line each
cooling season for cleanliness. Clean when necessary.
3. Inspect blower motor and wheel for cleanliness each cooling
season. Clean when necessary.
4. Check electrical connections for tightness and controls for
proper operation each cooling season. Service when neces-
sary.
Step 1—Air Filter
IMPORTANT: Never operate the unit without a suitable air filter
in the return-air duct system. Always replace the filter with the
same dimensional size and type as originally installed. See Table
1 for 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 and twice during the heating season, or
whenever the filter becomes clogged with dust and lint.
Step 2—Indoor Blower and Motor
NOTE: All motors are prelubricated. Do not attempt to lubricate
these motors.
For longer life, operating economy, and continuing efficiency,
clean accumulated dirt and grease from the blower wheel and
motor annually.
Disconnect and tag electrical power to the unit before
cleaning and lubricating the blower motor and wheel. Failure
to adhere to this warning could cause personal injury or death.
Step 3—Outdoor Coil, Indoor Coil, and Condensate
Drain
Inspect the condenser coil, evaporator coil, and condensate drain at
least once each year.
The coils are easily cleaned when dry; therefore, inspect and clean
the coils either before or after each cooling season. Remove all
obstructions, including weeds and shrubs, that interfere with the
airflow through the condenser coil.
Straighten bent fins with a fin comb. If coated with dirt or lint,
clean the coils with a vacuum cleaner, using the soft brush
attachment. Be careful not to bend the fins. If coated with oil or
grease, clean the coils with a mild detergent-and-water solution.
Rinse coils with clear water, using a garden hose. Be careful not to
splash water on motors, insulation, wiring, or air filter(s). For best
results, spray condenser coil fins from inside to outside the unit.
On units with an outer and inner condenser coil, be sure to clean
between the coils. Be sure to flush all dirt and debris from the unit
base.
Inspect the drain and condensate drain line when inspecting the
coils. Clean the drain and condensate drain line by removing all
foreign matter from the drain. Flush the drain and drain trough
with clear water. Do not splash water on the insulation, motor,
wiring, or air filter(s). If the drain trough is restricted, clear it with
a "plumbers snake" or similar probe device.
Step 4—Outdoor Fan
Keep the condenser fan free from all obstructions to ensure
proper cooling operation. Never place articles on top of the
unit. Damage to unit may result.
1. Remove 6 screws holding outdoor grille and motor to top
cover.
2. Turn motor/grille assembly upside down on top cover to
expose fan blade.
3. Inspect the fan blades for cracks or bends.
4. If fan needs to be removed, loosen setscrew and slide fan off
motor shaft.
5. When replacing fan blade, position blade so that the hub is 1/8
in. (3.175 mm) away from the motor end (See Fig. 21).
6. Ensure that setscrew engages the flat area on the motor shaft
when tightening.
7. Replace grille.
Step 5—Electrical Controls and Wiring
Inspect and check the electrical controls and wiring annually. Be
sure to turn off the electrical power to the unit and install lockout
tag.
Remove access panel to locate all the electrical controls and
wiring. Check all electrical connections for tightness. Tighten all
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