Bryant 549B User Manual
Page 38
—
38
—
C. To Use Cooling Charging Charts
Take the outdoor ambient temperature and read the suction
pressure gage. Refer to the appropriate chart to determine
what the suction temperature should be. If the suction tem-
perature is high, add refrigerant. If the suction temperature
is low, carefully recover some of the charge. Recheck the suc-
tion pressure as the charge is adjusted.
EXAMPLE: (Fig. 38; Circuit 1)
Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 F
Suction Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 psig
Suction Temperature should be . . . . . . . . . . . . . . . . . . . . 51 F
(Suction Temperature may vary ± 5
° F.)
D. Heating Charge
Do not attempt to adjust the refrigerant charge while the
unit is operating in the Heating mode. If the charge amount
is believed to be incorrect, recover refrigerant and weigh in
the amount listed on the unit rating plate.
X. TYPICAL WIRING
Refer to Fig. 41 for a typical unit wiring diagram.
XI. REPLACEMENT PARTS
A complete list of replacement parts may be obtained from
any Bryant distributor.
Fig. 38 — Cooling Charging Chart, 549B090
100
95
90
85
80
75
70
65
60
SUCTION LINE PRESSURE PSIG
621
552
483
414
SUCTION LINE PRESSURE (KILOP
ASCALS)
689
77
72
67
62
57
52
47
42
32
25
20
15
10
5
SUCTION LINE TEMPERATURE DEG F
SUCTION LINE TEMPERATURE DEG F
OUTDOOR
TEMP
F
125
115
105
95
85
75
C
64
46
41
35
29
24
Fig. 39 — Cooling Charging Chart, 549B102
Fig. 40 — Cooling Charging Chart, 549B120