Care And Maintenance; Filter Assembly; Cooling Coil, Drain Pan, And Condensate Drain - Carrier FA4ANF Service Manual

14. Horizontal Applications only—Place horizontal condensate
pan into position on coil/pan assembly.
NOTE: Installation of horizontal condensate pan is not necessary
for upflow or downflow applications.
15. Slide complete assembly into unit.
16. Reinstall fitting panel and reconnect clip securing fitting panel
to condensate drain pan.
17. Horizontal Applications Only—Reinstall horizontal pan
clip. Secure with 1 screw. (See Fig. 31.)
18. Reinstall coil access panel.
19. Reconnect liquid and vapor refrigerant tubes, and condensate
drain tube. Install new Puron (R-410A) liquid line filter-drier.
20. Evacuate tube set and indoor coil to 500 microns, back seat
(open) liquid and vapor service valves.
21. Turn on electrical supplies to indoor and outdoor units.
22. Check system refrigerant charge and operation. See "Appli-
cation Guideline and Service Manual for R-410A" for further
information.
Step 2—Slope Coil Units
If it is determined that system does not have leaks and refrigerant
is not contaminated, proceed as follows:
1. Recover system refrigerant.
a. Attach manifold/gage set to service valves.
b. Front seat (close) liquid tube service valve.
c. Start unit in cooling mode.
d. Run unit until low pressure switch opens at 50 psig
(350kPa) or vapor pressure reaches 5 psig (35kPa). Do not
allow compressor to pump into a vacuum.
e. Turn off electrical supply to outdoor unit.
f. Front seat vapor service valve.
g. Recover any remaining refrigerant.
NOTE: All outdoor unit coils will hold only factory-supplied
amount of refrigerant. Excess refrigerant, such as in long-tube
applications, may cause compressor internal pressure relief valve
to open (indicated by sudden rise in vapor pressure) before vapor
pressure reaches 5 psig (35kPa). If this occurs, turn off electrical
supply to outdoor unit immediately, front seat vapor service valve,
and recover any remaining refrigerant.
2. Turn off electrical supply to indoor unit.
3. Disconnect condensate drain tube.
4. Disconnect liquid and vapor tubes from indoor coil. Use either
a tubing cutter to cut tubes or a torch to unbraze tubes as
required.
NOTE: If a torch is used to unbraze line set, protect fitting panel
with a wet cloth or braze shield, as necessary. System contains oil
vapors which may ignite when exposed to a flame.
5. Remove coil access and fitting panels.
6. Remove 1 screw securing coil to unit casing.
7. Remove coil/pan assembly from unit.
8. Place assembly on a flat surface. Remove 2 screws securing
coil support columns to pan. (See Fig. 32.)
9. Rotate columns 90°, pull away from coil, and remove columns
from assembly.
10. Remove remaining 2 screws securing coil to condensate pan.
11. Remove coil from condensate pan.
12. Remove coil top seal. (See Fig. 32.)
13. Install new coil into condensate pan using 2 original screws
and 2 support columns.
NOTE: Correct coil position in condensate pan is essential to
reliable operation.
14. Install new coil/pan assembly into unit. Secure with 2 screws
previously removed from unit casing.
15. Reinstall coil access and fitting panels.
16. Reconnect liquid and vapor refrigerant tubes, and condensate
drain tube. Install new Puron (R-410A) liquid line filter-drier.
17. Evacuate tube set and indoor coil to 500 microns, back seat
(open) liquid and vapor service valves.
18. Turn on electrical supplies to indoor and outdoor units.
19. Check system refrigerant charge and operation. See "Appli-
cation Guideline and Service Manual for R-410A" for further
information.

CARE AND MAINTENANCE

To continue high performance, and minimize possible equipment
failure, it is essential periodic maintenance be performed on this
equipment.
The ability to properly perform maintenance on this equipment
requires certain mechanical skills and tools. The only consumer
service recommended or required is filter maintenance. (See Filter
Assembly.)
Disconnect all power to the unit before servicing the field
wires or removing the control package. The disconnect (when
used) on the access panel does not disconnect power to the
line side of the disconnect, but does allow safe service to all
other parts of the unit. Electrical shock can cause personal
injury or death.
The minimum maintenance requirements for this equipment are as
follows:
1. Inspect and clean or replace air filter each month or as
required.
2. Inspect cooling coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean as necessary. An inspec-
tion port is provided on all A-coil delta plates. Remove plastic
plug to inspect. Replace plug after inspection.
3. Inspect blower motor and wheel for cleanliness each heating
and cooling season. Clean as necessary.
4. Inspect electrical connections for tightness and controls for
proper operation each heating and cooling season. Service as
necessary.
As with any mechanical equipment, personal injury can result
from sharp metal edges. Be careful when removing parts.
Step 1—Filter Assembly
To clean or replace air filter, push plastic connectors toward center
of unit and remove filter access panel outward. Push filter up and
back into unit. Then slide filter out. Clean filter by using cold
water and mild detergent. Rinse and allow filter to dry. No oiling
or coating of filter is required. New filters are available from your
local distributor. Place filter in slot with cross-mesh binding up or
facing cooling coil and replace filter access panel.
Step 2—Cooling Coil, Drain Pan, and Condensate Drain
The cooling coil is easily cleaned when it is dry. Inspect the coil
and clean (if necessary) before each cooling season. To check or
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