16
DFT 2
DFT1
FILTER
DRIER
FILTER
DRIER
1A
2A
OUTDOOR COIL
INDOOR COIL
ACCUMULATOR
ACCUMULATOR
HPS1
STRAINER
HEATING LIQUID LINES
STRAINER
1C
2C
2D
1D
TXV 2
TXV1
COOLING LIQUID LINES
LPS/LOC
2B
1B
HPS2
COMPRESSOR
COMPRESSOR
COMP 2
COMP 1
ACCUTROL
C12046
Fig. 20 -- Typical TXV Piping Schematic
Refrigerant System Pressure Access Ports
There are two access ports in the system -- on the suction
tube near the c ompressor and on t he discharge tube near
the compressor. These are brass fittings with black plastic
caps. The hose connection fittings are standard 1/4 SAE
male flare couplings.
The brass fittings are two--piece High Flow valves, with a
receptacle base brazed to the tubing and an integral
spring--closed check valve core screwed into the base. See
Fig. 21. This check valve is permanently assembled into
this core body and cannot be serviced separately; replace
the e ntire core body if necessary. Service tools are
available from RCD that allow the replacement of the
chec k valve core without having to re cover the entire
system refrigerant charge. Apply compressor refrigerant
oil to the check valve core’s bottom o--ring. Install the
fitting body with 96 10 in--lbs (10.85 1.1 Nm) of
torque; do not overtighten.
PURONR (R--410A) REFRIGERANT
This unit is designed for use with Puron (R--410A)
refrigerant. Do not use any other refrigerant in this
system. Puron (R--410A) refrigerant is provided in pink
(rose) colored cylinders.
Puron (R--410A) refrigerant is provided in pink (rose)
colored cylinders. These cylinders are availa ble with and
without dip tubes; cylinders with dip tubes will have a
labe l indicat ing this feature. For a cyl inder with a dip
tube, place the cylinder in the upright position (access
valve at the top) when removing liquid refrigerant for
charging. For a cyl inder without a dip tube, invert the
cylinder (access valve on the bottom) when removing
liquid refrigerant.
Because Puron (R--410A) refrigerant is a blend, it is
strongly recommended that refri gerant a lways be removed
from the cylinder as a liquid. Admit liquid refri gerant into
the system in the discharge line. If adding refrigerant into
the suction line, use a commercial metering/expansion
devic e at the gauge manifold; remove liquid from the
cylinder, pass it through the metering device at the gauge
set and then pass it into the suction line as a vapor. Do not
remove Puron (R--410A) refrigerant from the cylinder as a
vapor.
Refrigerant Charge
Amount of refrigerant charge is listed on the unit’s
nameplate. Refer to Carrier GTAC2--5 Charging,
Recovery, Recycling and Reclamation training manual
and the following procedures.
Unit panels must be in pla ce when unit is operati ng during
the charging procedure.
48HC
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