Carrier 48SX024-048 - Manual (Page 21)

PRE-START-UP
A WARNING
Failure to observe the following warnings could result
in serious personal injury:
1. Follow recognized safety practices and wear protec­
tive goggles when checking or servicing refrigerant
system.
2. Do not operate compressor or provide any electric
power to unit unless compressor terminal cover is
in place and secured.
3. Do not remove compressor terminal cover until all
electrical sources are disconnected.
4. Relieve and reclaim all refrigerant from system be­
fore touching or disturbing anything inside terminal
box if refrigerant leak is suspected around compres­
sor terminals.
5. Never attempt to repair soldered connection while
refrigerant system is under pressure.
6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure. To re­
move a component, wear protective goggles and pro­
ceed as follows:
a. Shut off gas supply and then electrical power to
unit.
b. Relieve and reclaim all refrigerant from system
using both high- and low-pressure ports.
c. Cut component connecting tubing with tubing cut­
ter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
Proceed as follows to inspect and prepare the unit for ini­
tial start-up:
1. Remove all access panels.
2. Read and follow instructions on all WARNING, CAU­
TION, and INFORMATION labels attached to, or shipped
with, unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages such as
broken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections
and on unit base. Detecting oil generally indicates a
refrigerant leak. Leak-test all refrigerant tubing con­
nections using electronic leak detector, halide torch,
or liquid-soap solution. If a refrigerant leak is
detected, see Check for Refrigerant Leaks section
below.
c. Inspect all field- and factory-wiring connections. Be
sure that connections are completed and tight.
d. Inspect coil fins. If damaged during shipping and han­
dling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
A CAUTION
Do not purge gas supply into the combustion cham­
ber. Do not use a match or other open flame to
check for gas leaks. Failure to follow this warning
could result in an explosion causing personal injury
or death.
c.
d.
Before lighting the unit for the first time, perform
the following: If the gas supply pipe was not purged
before connecting the unit, it will be full of air. It is
recommended that the ground joint union be loos­
ened, and the supply line be allowed to purge until
the odor of gas is detected. Never purge gas lines
into a combustion chamber. Immediately upon detec­
tion of gas odor, retighten the union. Allow 5 min­
utes to elapse, then light unit
Make sure that outdoor-fan blade is correctly posi­
tioned in fan orifice. Leading edge of outdoor-fan
blade should be
‘/2 in. maximum from plastic fan or­
ifice (see Fig. 22).
Make sure that air filter(s) is in place.
Make sure that condensate drain trap is filled with
water to ensure proper drainage.
Make sure that all tools and miscellaneous loose parts
have been removed.
START-UP
Check for Refrigerant Leaks - Proceed as follows
to locate and repair a refrigerant leak and to charge the unit:
1. Locate leak and make sure that refrigerant system pres­
sure has been relieved and reclaimed from both high-
and low-pressure ports.
2. Repair leak following accepted practices.
NOTE: Install a filter drier whenever the system has been
opened for repair.
3. Add a small charge of R-22 refrigerant vapor to system
and leak-test unit.
4. Evacuate and reclaim refrigerant from refrigerant sys­
tem if additional leaks are not found.
5. Charge unit with R-22 refrigerant, using a volumetric-
charging cylinder or accurate scale. Refer to unit rating
plate for required charge. Be sure to add extra refrig­
erant to compensate for internal volume of filter drier.
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