Carrier 48EL - Manual (Page 8)

CAUTION: System contains oil and refiigerant
under pressure. Do not use torch to remove
component. Wear your protective gog^es.
1. Shut off electrical power to unit.
2. Relieve all pressure from system.
3. Cut connecting piping with tubing cutter.
4. Remove component from unit.
5. Unsweat piping stubs carefully. Oil may ignite
when exposed to torch flame.
WELDED HERMETIC COMPRESSOR - Make
certain that all safety codes are followed. Use
protective goggles, work gloves and water-soaked
quenching cloth.
1. Shut off electrical power and remove all wiring
from compressor.
2. Purge or remove all refrigerant and pressure
from system.
3. Cut suction and discharge lines with tubing
cutter at convenient place near compressor to
facilitate reassembly with copper slip
couplings.
4. Remove compressor from unit and carefully
unbraze piping stubs. Oil vapor in piping stubs
can ignite from torch flame, use quenching
cloth if necessary
5. Install old piping stubs on new compressor and
carefully braze in place.
6. Clean system. Add or replace liquid line filter
drier.
7. Install hew compressor in unit and braze in
place with field-supplied copper slip couplings.
Protect pressure relief plug in suction line with
wet rag if brazing near it.
8. Connect wiring; replace wire terminals if
necessary.
9. Attach caution sticker to new compressor.
10. Proceed with evacuation, charging and start­
up. Procedures for evacuation and system
cleanout can be found in Carrier Standard
Service Techniques Manual, Chapter 1, Form
SM-1.
Part Removal Evaporator Fan (Blower Wheel) —
Remove fan as follows:
1. Shut off all electrical power to unit.
2. Remove heating section access panel.
3. Loosen 5 screws and remove interior panel.
4. Disconnect the 2 wires to the fan motor.
5. Remove screws holding the evaporator fan
housing and the support strap and slide housing
and fan from unit.
Part Removal (Refrigerant System)
Disconnect electrical power before working
inside unit.
1. Inspect and clean (if required) fan blades and
housing, cooling coil, condensate pan and drain.
See below for cleaning details.
2. Inspect and clean air filter, and supply and
return air grilles.
3. Check electrical components and connections.
Checking procedures may be found in Carrier
Standard Service Techniques Manual,
Chapter 2, Form SM-2.
4. Inspect panels and ducts for air leaks.
Fall Inspection
Disconnect electrical power before working
inside unit.
1. Follow all steps under Spring Inspection.
2. Inspect and clean pilot, main burners, heat
exchangers and flues.
3. Check main gas valve operation.
Cleaning
HEAT EXCHANGER
1. Shut down unit.
2. Remove heating section access panel, heat
shield front upper panel, flue box and radiation
baffle over burners. Preserve all gaskets.
3. Clean soot from inside of heat exchanger and
other internal surfaces, especially the narrow
vertical sections of tubes. Use a long wire-
handled nylon-bristle brush and vacuum
cleaner.
4. Reassemble unit. Take care not to damage
gaskets.
INDOOR (EVAPORATOR) COIL - Clean with
stiff brush, vacuum cleaner or compressed air.
OUTDOOR (CONDENSER) COIL - Clean out­
door coil annually or as required by location or
• outdoor air conditions. Inspect coil monthly —
clean as required.
Fins are not continuous thru coil sections. Dirt
and debris may pass thru first section, become
trapped between the 3 rows of fins, and restrict
condenser airflow. Use a flashlight to determine if
dirt or debris has collected between coil sections.
Clean coil as follows"
1. Turn off unit power.
2. Remove top cover screws and slide cover
toward the compressor end of unit and/or to
the side to expose top of condenser coil.
3. Remove screws that fasten the 3 sections of the
tube sheet together at the return bend end of
the condenser coil. Carefully spread the ends of
the coils apart (see Fig. 9).
Spring Inspection