Bryant 619F Installation, Start-Up And Service Instructions

VIII. REFRIGERANT CHARGING
WARNING:
To prevent personal injury, wear safety
glasses and gloves when handling refrigerant. Do
not overcharge system — this can cause compressor
flooding.
WARNING:
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 re-
sult in loss of system charge or personal injury.
NOTE: Do not vent or depressurize unit refrigerant to atmo-
sphere. Remove and recover refrigerant following accepted
practices.
The 538S units are factory charged with a full operating charge.
Check the system for proper charge level using the subcool-
ing method.
If a refrigerant system must be opened for major service work,
first recover refrigerant in system using accepted practices.
Evacuate and dehydrate the system when ready to recharge;
then weigh in the proper refrigerant quantity (as marked on
the unit data plate for each circuit.)
A. Subcooling Charging Method
1. Operate the unit a minimum of 15 minutes before check-
ing the charge.
2. Measure discharge pressure by attaching an accurate
gage to the discharge service port. DO NOT use the ex-
ternal service valves for this pressure reading.
3. Measure the vapor supply line temperature by attach-
ing an accurate thermistor-type or electronic thermom-
eter to the vapor supply line near the outdoor coil. See
Fig. 14.
4. Refer to Table 4 to find the required subcooling tempera-
ture for the unit. Find the point at which the required
subcooling temperature intersects the measured inter-
nal discharge service port pressure in Table 5.
5. To obtain the required subcooling temperature at a spe-
cific discharge pressure, add refrigerant if vapor supply
line temperature is higher than indicated, or remove re-
frigerant if temperature is lower than indicated. Allow
a tolerance of ± 3%.
IX. COMPRESSOR LOCKOUT SWITCH (CLO)
Units are provided with compressor lockout protective de-
vice. If the compressor shuts down due to any safety device,
a current loop monitoring the compressor current senses no
current flow. The unit will lock out until the control power is
interrupted to reset the lockout. Determine reason for safety
trip. To restart, turn the 538S main disconnect to OFF, then
to ON position.
Table 4 — Required Unit Subcooling
UNIT 538S
_
SUBCOOLING AT TXV INLET (F)
WITH ALL FANS OPERATING
024 19
048 16
TXV — Thermostatic Expansion Valve
Table 5 — Required Liquid Line Temperatures
PRESSURE
(Psig) AT
SERVICE
FITTING
REQUIRED SUBCOOLING TEMPERATURE (F)
0 5 10 15 20 25
134 76 71 66 61 56 51
141 79 74 69 64 59 54
148 82 77 72 67 62 57
156 85 80 75 70 65 60
163 88 83 78 73 68 63
171 91 86 81 76 71 66
179 94 89 84 79 74 69
187 97 92 87 82 77 72
196 100 95 90 85 80 75
205 103 98 93 88 83 78
214 106 101 96 91 86 81
223 109 104 99 94 89 84
233 112 107 102 97 92 87
243 115 110 105 100 95 90
253 118 113 108 103 98 93
264 121 116 111 106 101 96
274 124 119 114 109 104 99
285 127 122 117 112 107 102
297 130 125 120 115 110 105
309 133 128 123 118 113 108
321 136 131 126 121 116 111
331 139 134 129 124 119 114
346 142 137 132 127 122 117
359 145 140 135 130 125 120
LEGEND
SV — Service Valve
X—Measurement Location
Fig. 14 — Vapor Supplly Line Measurement
Locations (538S
_
048 Unit Shown)
—16—

Bryant 619F Specifications

General

Brand	Bryant
Model	619F
Category	Air Conditioner
Language	English