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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 agency, 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 operations and
have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes for special
requirements. In absence of local codes, it is
recommended that the USA standard ANSI/NFPA 70,
National Electrical Code (NEC), be followed.
It is important to recognize safety information. This is the
safety--alert 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
result 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 service or maintenance operations
on unit, always 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 components on Puron
refrigerant equipment.
!
WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause in personal
injury or death.
Relieve pressure and recover all refrigerant before
system repair or final unit disposal.
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 appropriate protective clothing, safety
glasses and gloves when handling parts and servicing
38AUD 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 recommended.
Existing evaporator coil –
If the existing evaporator coil
may be re-used, check with the coil manufacturer to verify
the coil construction is suitable for operation with the
higher pressures of Puron
R
(R-410A). Also determine if
the existing TXV valve is compatible with R-410A,
replace if necessary. The minimum factory test pressure
rating must be 1725 kPa (250 psig). Existing 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 issues: quality (strength) of existing
tubing, cleanliness and tube size. Inspect all tube segments
and joints for signs of damage, corrosion or poor brazing.
Flush the interconnecting piping system with dry Nitrogen to
eliminate as much trace of mineral oil as possible.
38A
U
D
Summary of Contents for 38AUD 16 Series
Page 21: ...21 CIRCUIT 1 CIRCUIT 2 C10946 Fig 16 38AUD 16 Charging Chart Novation 38AUD...
Page 22: ...22 C10949 Fig 17 38AUD 16 Charging Chart RTPF 38AUD...
Page 23: ...23 CIRCUIT 1 CIRCUIT 2 C10950 Fig 18 38AUD 25 Charging Chart RTPF 38AUD...
Page 24: ...24 C10084A Fig 19 Typical 38AUD 16 Wiring Diagram 38AUD...
Page 25: ...25 C10085A Fig 20 Typical 38AUD 25 Wiring Diagram 38AUD...