Table of Contents
Advertisement
5/8" HEX
PURON (R-410A) REFRIGERANT
This unit is designed for use with Puron
Do not use any other refrigerant in this system.
Puron (R-410A) refrigerant is provided in pink (rose) colored
cylinders. 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 position (access valve at the top) when removing liquid
refrigerant for charging. For a cylinder without a dip tube, in-
vert the cylinder (access valve on the bottom) when removing
liquid refrigerant.
Because Puron (R-410A) refrigerant is a blend, it is strongly
recommended that refrigerant always be removed from the cyl-
inder as a liquid. Admit liquid refrigerant into the system in the
discharge line. If adding refrigerant into the suction line, use a
commercial metering/expansion device at the gage manifold;
remove liquid from the cylinder, pass it through the metering
device at the gage 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 Bryant GTAC2-5 Charging, Recovery, Recycling and
Reclamation 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, Fig. 21-23, vary refrigerant
until the conditions of the appropriate 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 gage and
temperature sensing device are required. Connect the pressure
gage to the service port on the liquid line. Mount the tempera-
ture sensing device on the liquid line and insulate it so that out-
door ambient temperature does not affect the reading. Indoor-
air cfm must be within the normal operating range of the unit.
.
1. CoreMax is a registered trademark of Fastest, Inc.
SEAT
1/2-20 UNF RH
0.596
30°
0.47
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
Fig. 20 — CoreMax
(R-410A) refrigerant.
®
CORE
(Part No. EC39EZ067)
WASHER
O-RING
1/2" HEX
Access Port Assembly
1
549K SIZE DESIGNATION
04
05
06
USING COOLING CHARGING CHARTS
Take the outdoor ambient temperature and read the liquid pres-
sure gage. Refer to chart to determine what liquid temperature
should be. If liquid temperature is low, add refrigerant. If liquid
temperature is high, carefully recover some of the charge. Re-
check the liquid pressure as charge is adjusted.
COOLING CHARGING CHARTS
59.9
140
120
48.8
37.7
100
26.6
80
15.5
60
4.4
40
-6.7
20
150
1034
Fig. 21 — Cooling Charging Chart - 3 Ton
13
45°
DEPRESSOR PER AHRI 720
+.01/-.035
FROM FACE OF BODY
7/16-20 UNF RH
NOMINAL TONS REFERENCE
3
4
5
3 Ton 50GCQ / 549K / RHW
R410A Refrigerant Charging Chart
(Unit must run in cooling mode, on high stage
compressors & outdoor fan on high speed)
Add Charge if Above the Curve
Remove Charge if Below the Curve
200
250
300
350
400
450
1379
1723
2068
2413
2758
3102
Compressor Discharge Pressure, [psig/Kpa]
500
550
600
3447
3792
4136
48TC003785
A
Advertisement
Table of Contents
Troubleshooting
