Carrier 1995 Room Air - Manual (Page 3)

Compressor Replacement
A CAUTION
Stand clear of compressor terminals when working on
compressors With system under pressure, terminals may
blow causing personal injury
Observe the same safety procedures for rotary compres­
sors as for reciprocating compressors
When changing compressors
1 Follow all safety codes Reminder use protective
goggles, work gloves, and water-soaked quenching
cloth
2 Shut off all electrical power to unit by removing power
cord from outlet, then disconnect all wiring from the
compressor
3 Apply field-supplied tap-a-lines to the true (closest to
compressor) suction and discharge connections of the
compressor
4 Recover the refrigerant charge from the unit After re­
covering, cut the discharge and suction line process tubes
below
Sie
tube crimps If you choose a good tubing
location for cutting the refrigerant lines initially, the
location is easily accessible when making the final joints
You can braze the oil piping stub into the new com-
piessor fittings more easily before the compiessor is
put back into the unit
A CAUTION
Oil vapor in piping stubs can ignite from torch flame
and cause serious injury Exeicise extreme care when
brazing, and keep brazing cloth and fire extin­
guisher handy for emergency use
10
U
12
Connect a nitrogen supply to the unit at one of the tap-
a-line connectors (5 psig maximum flow), leaving the
other connector open to the atmosphere Braze angle
valves with stubs to each process tube
Remove compressor from unit Refer to Compressor
Removal, page 11
Remove tap-a-lines from suction and discharge lines
Carefully braze the holes closed from where the tap-a-
lines were removed
Clean system add or replace liquid line filter drier
For proper cleaning and flushing, use the Carriei
Totalclaim® recovery system or a comparable refriger­
ant recycling system
Install new compressor and braze into place with field-
supplied copper slip couplings
Connect wiring replace wire terminals if necessary
Proceed with evacuation and charging Pinch off lines
where angle valves were added Cut off angle valves
above pinch-off, and braze tubes
Start up unit
PREVENTIVE MAINTENANCE
General
CLEANING — Clean cooling coil and condenser coil Hold
flashlight behind coil to see if all spaces are clear Use a
hooked wire to remove dirt Dust accumulation obstructs or
reduces airflow and results in loss of capacity Coils may
be vacuumed when dry Outdoors, unit can be brushed with
a stiff brush and fins blown out with compiessed aii
Thoioughly clean basepan, motois, fan wheels, other com­
ponents, and all drain passages Vacuum insulation Clean
all inside painted surfaces with mild detergent to remove
grease
Clean cabinet and grille Mild detergents reduce electro­
static charges on plastic sections of the grille and are good
cleaners Do not use carbon tetrachloride, solvents, or waxes
containing solvents to clean plastic sections
PAINTING — Paint any parts that show evidence of rust
with a good rust-resistant paint
WIRING — Check all wiring for deterioration and all elec­
trical contacts for tightness and lack of corrosion
MOUNTING — Make sure unit is secure in window, and
level from left to right and from front to rear according to
installation instructions provided
Check fans to ensure they are correctly positioned, cen­
tered in orifice, and tight on shaft
LEAKS — Check any connections that show evidence of
oil oi leaks When unit is propeily installed, centered, and
leveled (see Owners’ Guide), check gaskets and wing pan­
els for possible ail leakage
CONTROLS — Check unit to ensure all contiols are func­
tioning correctly and unit operation is normal
Vibrations can cause unwanted noise Check to be sure
no piping is vibrating against any side of unit
System Cleaning/Flushing — For proper cleaning
and flushing, use the Carrier Totalclaim recovery system,
or a comparable refrigerant recycling system
DISASSEMBLY INFORMATION
A WARNING
Before working on any air conditioner, be sure to first
disconnect all electric power to unit to avoid the pos­
sibility of electrical shock and personal injury
The Electronic Control Room Air Conditioner is cooling
only and has casing key no 305
All units have a slide-out chassis Units can be serviced
without removing casing