16
Fig. 23 — TXV Valve and Sensing Bulb Location
PURON (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 cyl-
inders. These cylinders are available with and without dip tubes;
cylinders with dip tubes will have a label indicating this feature.
For a cylinder with a dip tube, place the cylinder in the upright po-
sition (access valve at the top) when removing liquid refrigerant
for charging. For a cylinder 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 rec-
ommended that refrigerant always be removed from the cylinder
as a liquid. Admit liquid refrigerant into the system in the dis-
charge line. If adding refrigerant into the suction line, use a com-
mercial metering/expansion device 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. Re-
fer to Carrier GTAC2-5 Charging, Recovery, Recycling and Rec-
lamation training manual and the following procedures.
Unit panels must be in place when unit is operating during the
charging procedure.
NO CHARGE
Use standard evacuating techniques. After evacuating system,
weigh in the specified amount of refrigerant.
LOW-CHARGE COOLING
Using Cooling Charging Charts, Figures 25-29 for units without
the Humidi-MiZer option or Figures 30-34 for units with the Hu-
midi-MiZer option, vary refrigerant until the conditions of the ap-
propriate chart are met. Note the charging charts are different from
type normally used. Charts are based on charging the units to the
correct sub-cooling for the various operating conditions. Accurate
pressure gauge and temperature sensing device are required. Con-
nect the pressure gauge to the service port on the liquid line.
Mount the temperature sensing device on the liquid line and insu-
late it so that outdoor ambient temperature does not affect the
reading. Indoor-air cfm must be within the normal operating range
of the unit.
EXAMPLE:
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48FC**08
Outdoor Temperature. . . . . . . . . . . . . . . . . . . . . . . . 85°F (29°C)
Suction Pressure. . . . . . . . . . . . . . . . . . . . . . 140 psig (965 kPa)
Suction Temperature should be. . . . . . . . . . . . . . . . 65°F (16°C)
USING COOLING CHARGING CHARTS
Take the outdoor ambient temperature and read the liquid pressure
gauge. Refer to chart to determine what liquid temperature should
be. If liquid temperature is low, add refrigerant. If liquid tempera-
ture is high, carefully recover some of the charge. Recheck the liq-
uid pressure as charge is adjusted.
Fig. 24 — CoreMax™
1
Access Port Assembly
VIEW WITH TXV BULB
INSULATION COVER REMOVED
TXV BULB
TXV BULB PROCESS TUBE
BULB CAPILLARY TUBE
SUCTION LINE
48FC SIZE DESIGNATION NOMINAL TONS REFERENCE
08 7.5
09 8.5
12 10.0
14 12.5
16 15.0
1. Third-party trademarks and logos are the property of their respective owners.
5/8" HEX
0.47
30°
0.596
1/2-20 UNF RH
1/2" HEX
45°
Washer
O-Ring
7/16-20 UNF RH
Depressor per AHRI 720
+.01/–.035
From Face of Body
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
SEAT CORE
(Part No. EC39EZ067)
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