12
428 01 9700 03
Refrigerant Charging
!
WARNING
PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE HAZARD
Failure to follow this warning could result in
personal injury and/or equipment damage.
Wear safety glasses and gloves when handling
refrigerant. Do not overcharge system
−
this can
cause compressor flooding.
!
WARNING
PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE HAZARD
Failure to follow this warning could result in
personal injury and/or equipment damage.
Service valves must be fully backseated to close
service port. There is no Schrader valve at the
service port, and failure to backseat the valve
could result in loss of system charge or personal
injury.
NOTE
: Do not vent or de
−
pressurize unit refrigerant to
atmosphere. Remove and recover refrigerant following
accepted practices.
All units are shipped with the refrigerant charge listed on the
nameplate.
Refer to Table 3 and consider the following when working
with R
−
410A refrigerant:
R
−
410A refrigerant cylinders are rose colored.
Recovery cylinder service pressure rating must be
400 psig, DOT (Department of Transportation)
4BA400 or DOT BW400.
R
−
410A systems should be charged with liquid
refrigerant. Use a commercial type metering device
in the manifold hose when charging into suction line
with compressor operating.
Manifold sets should be 700 psig high side and 180
psig low side with 550 psig low
−
side retard.
Use hoses with 700 psig service pressure rating.
R
−
410A refrigerant, as with other HFCs, is only
compatible with POE oils.
Vacuum pumps will not remove moisture from oil.
Polyol Ester oils absorb moisture rapidly. Do not
expose oil to atmosphere.
Polyol Ester oils may cause damage to certain
plastics and roofing materials.
Wrap all filter driers and service valves with wet cloth
when brazing.
Factory approved, liquid
−
line filter drier is required on
every unit.
Do not use a TXV (thermostatic expansion valve)
designed for use with R
−
22 refrigerant. Refer to
separate indoor unit installation instructions for more
details.
If using a suction line drier, do not leave in place for
more than 72 hours.
