2
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock or other conditions which may cause personal
injury or property damage. Consult a qualified installer,
service agenc y, or your distributor or branch for
information or assistance. The qualified installer or
agency must use factory-authorized kits or accessories
when modifying this product. Refer to the individual
instructions package
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing ope rations and
have a fire extinguisher available. Read these instruc tions
thoroughly and follow all warnings or cautions attached to
the uni t. Consult local building codes and appropria te
national electrical codes (in USA, ANSI/NFPA70,
Nationa l Electrica l Code (NEC); i n Canada, CSA C22.1)
for special requirements.
It is important to recognize safety information. This is the
safety--a lert symbol
. When you see this symbol on the
unit and in instructions or manuals, be alert to the
potential for personal injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the
safety-alert symbol. DANGER identifies the most serious
hazards which will result in severe personal injury or
death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify
unsafe practices, which may re sult in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced
installation, reliability, or operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause in personal
injury or death.
Before performing se rvice or maintenance operations
on unit, a lways turn off main power switch to unit and
install lockout tag. Unit may have more than one
power switch.
!
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause in personal
injury,death and/or equipment damage.
Puron
R
(R--410A) refrigerant systems operate at
higher pressures than standard R--22 systems. Do not
use R--22 service equipment or compone nts on Puron
refrigerant equipment.
!
WARNING
PERSONAL INJUR Y AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause in personal
injury or death.
Relieve pressure a nd recover all refrigerant before
system repair or final unit di sposal.
Wear safety glasses and gloves when handling
refrigerants. Keep torches and other ignition sources
away from refrigerants and oils.
!
WARNING
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear a ppropriate protective clothing, safety
glasses and gloves when handling parts and servicing
38AU units.
CAUTION
!
INSTALLATION GUIDELINE
Replacement/Retrofit — R--22 to Puron
R
Replacement/retrofit installations require change-out of
outdoor unit, metering device, and filter driers.
Change-out of indoor coil (evaporator) and
interconnecting tubing is rec ommended.
Existing evaporator coil – If the exi sting e vaporator coil
may be re-used, check with the coil manufacturer to verify
the coil construction is suitable for operation with the
higher pre ssures of Puron
R
(R-410A). Also determ ine if
the existing TXV valve is compatible with R-410A,
replace if necessary. The minimum factory test pressure
rating must be 250 psig (1725 kPa). Exi sting coil will
need to be purged with Nitrogen to remove as much
mineral oil as possible to eliminate cross contamination of
oils.
Acid test – If the existing system is being replaced
because of a compressor electrical failure, assume acid is
in system. If system is being replaced for any other
reason, use an approved acid test kit to determine acid
level. If even low levels of acid are detected, install a 100
percent activated alumina suction-line filter drier in
addition to the replacement liquid-line filter drier.
Remove the suction line filter drier as soon as possible,
with a maximum of 72 hr of operation. Recommendation:
Install a ball valve in the liquid line at the filter drier
location when installing a suction filter in the suction line.
Existing refrigeration piping – Reuse of existing refrigerant
piping involves three iss ues : quality (strength) of existing
tubin g, cleanliness and tube size. Ins pect all tube segments
and joints for signs of damage, corrosion or poor brazing.
Flush the interconnectin g pipin g sys tem with dry Nitro gen to
eliminate as much trace of mineral oil as poss ib le.
38AU
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