Service Manual

25
Install Liquid- line Filter Drier Indoor -
AC
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To avoid performance loss and compressor failure,
installation of filter drier in liquid line is required.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To avoid filter drier damage while brazing, filter drier
must be wrapped in a heat- sinking material such as a
wet cloth.
Refer to Fig. 20 and install filter drier as follows:
1. Braze 5- in. liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to above 5” liquid tube. Flow arrow
must point towards indoor coil.
4. Connect and braze liquid refrigerant tube to the filter
drier.
Install Liquid- line Filter Drier Indoor -
HP
Refer to Fig. 21 and install filter drier as follows:
1. Braze 5 in. liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to 5 in. long liquid tube from step 1.
4. Connect and braze liquid refrigerant tube to the filter
drier.
Suction Line Filter Drier
The suction line drier is specifically designed to operate with
R- 410A, use only factory authorized components. Suction
line filter drier is used in cases where acid might occur, such
as burnout. Heat pump units must have the drier installed
between the compressor and accumulator only. Remove
after 10 hours of operation. Never leave suction line filter
drier in a system longer than 72 hours (actual time).
A05178
Fig. 20 – Liquid Line Filter Drier - AC
A05227
Fig. 21 – Liquid Line Filter Drier - HP
Accumulator
The accumulator is specifically designed to operate with
R- 410A or R- 22 respectfully; use only factory- authorized
components. Under some light load conditions on indoor
coils, liquid refrigerant is present in suction gas returning to
compressor. The accumulator stores liquid and allows it to
boil off into a vapor so it can be safely returned to
compressor. Since a compressor is designed to pump
refrigerant in its gaseous state, introduction of liquid into it
could cause severe damage or total failure of compressor.
The accumulator is a passive device which seldom needs
replacing. Occasionally its internal oil return orifice or bleed
hole may become plugged. Some oil is contained in
refrigerant returning to compressor. It cannot boil off in
accumulator with liquid refrigerant. The bleed hole allows a
small amount of oil and refrigerant to enter the return line
where velocity of refrigerant returns it to compressor. If
bleed hole plugs, oil is trapped in accumulator, and
compressor will eventually fail from lack of lubrication. If
bleed hole is plugged, accumulator must be changed. The
accumulator has a fusible element located in the bottom end
bell. (See Fig. 22.) This fusible element will melt at
430_F//221_C and vent the refrigerant if this temperature is
reached either internal or external to the system. If fuse
melts, the accumulator must be replaced.
To change accumulator:
1. Shut off all power to unit.
2. Recover all refrigerant from system.
3. Break vacuum with dry nitrogen. Do not exceed 5
psig.
NOTE: Coil may be removed for access to accumulator.
Refer to appropriate sections of Service Manual for
instructions.
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal
injury.
Wear safety glasses, protective clothing, and gloves
when handling refrigerant.
CAUTION
!
4. Remove accumulator from system with tubing cutter.
5. Tape ends of open tubing.