Service Manual

SERVICE AND MAINTENANCE FAN COILS
28 496 08 8001 02
Specifications subject to change without notice.
m. Attach the TXV bulb onto the suction line and
insulate.
n. Insulate the entire TXV body and outlet tubing to
prevent sweating.
Old all−aluminum coils with TXV
When replacing a previous all−aluminum coil that contains a
TXV, the old TXV can be reused and mounted inside the
cabinet.
a. After removal of the distributor inlet tube and piston,
the old TXV is attached to the distributor with 13/16”
Chatleff nut. The threads contain Loctite anti−seize
that can be reused.
b. Tighten the nut finger tight plus 1/2 turn.
c. The vapor header contains a small diameter stub
tube for the equalizer line.
d. Cut the end of the stub tube.
e. Insert TXV equalizer and braze together. Caution
must be taken to avoid braze splatter from the
aluminum surfaces of the new coil. Caution must be
taken to avoid heating the factory joint of the stub
tube to the vapor header.
f. The vapor header contains an indentation for the
TXV bulb. Attach the bulb and insulate.
Figure 25 − A−Coil Component Location
COIL TOP SEAL
EXPANSION DEVICE
(TXV SHOWN)
HORIZONTAL
CONDENSATE
PAN
HORIZONTAL
PAN CLIP
DELTA PLATE
VERTICAL
CONDENSATE
PAN
COIL BRACKET
(4 PER UNIT)
SCREWS–
DELTA PLATE TO
PAN (4 PER UNIT)
L14S006
A−Coil Units
1. Recover system refrigerant.
a. Attach gage/manifold set to service valves.
b. Start unit in cooling mode.
c. Front seat (close) liquid line service valve.
d. Operate unit until vapor pressure reaches 5 psig
(35kPa), or until suction line LPS opens.
e. Turn off electrical supply to outdoor unit.
f. Front seat (close) vapor service valve.
g. Recover any remaining refrigerant.
NOTE: All condenser coils hold only a factory−supplied
amount of refrigerant. Excess refrigerant, such as in long−line
applications, may cause compressor internal pressure relief
valve to open (indicated by sudden rise in vapor pressure)
before refrigerant is recovered. If this occurs, turn off electrical
supply to outdoor unit immediately, front seat (close) vapor
service valve, and recover any remaining refrigerant.
2. Turn off electrical supply to indoor unit.
3. Disconnect condensate drain line.
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal
injury.
Use of torch may cause oil to catch fire, resulting in
personal injury or death. To remove components use
tubing cutter only.
CAUTION
!
4. Disconnect liquid and vapor lines from indoor coil. Use a
tubing cutter to cut the lines.
5. Remove coil access panel.
6. Remove clip securing fitting panel to condensate drain pan
and remove fitting panel.
7. Remove all shipping clips (if present), including horizontal
pan clip. Slide coil and condensate pan assembly out of
unit.
8. Remove horizontal condensate drain pan from coil (if
present) and condensate pan assembly. (See. Figure 25)
9. Remove 4 coil brackets if present. (See Figure 25)
10.Remove screws at delta plates and remove coil from
vertical condensate drain pan. (See Figure 25)
11. Horizontal Applications Only—Remove drain
connections and J−shaped tube from original coil, and
install them in same position on new coil. (See Figure 25)
12.Place coil assembly in plastic condensate pan and secure
with 4 screws through delta plate. (See Figure 25)
13.Horizontal and Upflow Applications Only—Attach 4 coil
brackets to coil and pan assembly. (See Figure 25)
14.Horizontal Applications Only—Place horizontal
condensate pan into position on coil and pan assembly.
NOTE: Installation of horizontal condensate pan is not
necessary for upflow or downflow applications.
15.Slide completed 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 and secure with 1 screw. (See Figure 25)
18.Reinstall coil access panel.
19.Reconnect liquid and vapor refrigerant lines and
condensate drain line. Install new filter drier(s).
NOTE: If a torch is used to unbraze the line set, protect the
fitting panel with a wet cloth or braze shield as necessary.
20.Evacuate line 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 Split−
System Residential Air Conditioners and Heat Pump
Service Manuals for further information.
SLOPE COIL UNITS
1. Recover system refrigerant.
a. Attach gage/manifold set to service valves.
b. Start unit in cooling mode.
c. Front seat (close) liquid line service valve.
d. Operate unit until vapor pressure reaches 5 psig
(35kPa), or until suction line LPS opens.
e. Turn off electrical supply to outdoor unit.
f. Front seat (close) vapor service valve.