Table of Contents
Advertisement
STEP 12 —Check Charge
Factory charge and charging method are shown on unit rating
plate. To check charge in cooling mode, refer to Cooling Only
Procedure. To check charge in heating mode, refer to Heating
Check Chart Procedure.
Cooling Only Procedure
NOTE: If subcooling charging conditions are not favorable,
charge must be weighed in accordance with unit rating plate,
±0.6 oz/ft of 3/8- -in. liquid line above or below 15 ft,
respectively. Favorable conditions fall within the ranges given on
the charging chart on the outdoor unit plate.
This system requires charging by the subcooling method.
1. Operate unit a minimum of 10 minutes before checking
charge.
2. Measure liquid service valve pressure by attaching an
accurate gage to service port.
3. Measure liquid line temperature by attaching an accurate
thermistor type or electronic thermometer to liquid line
near outdoor coil.
4. Refer to unit rating plate for required subcooling
temperature.
5. Refer to Table 3. Find the point where required subcooling
temperature intersects measured liquid service valve
pressure.
6. To obtain required subcooling temperature at a specific
liquid line pressure, add refrigerant if liquid line
temperature is higher than indicated or reclaim refrigerant
if temperature is lower. Allow a tolerance of ± 3°F.
Heating Check Chart Procedure
To check system operation during heating cycle, refer to the
Heating Check Chart on outdoor unit. This chart indicates
whether a correct relationship exists between system operating
pressure and air temperature entering indoor and outdoor units. If
pressure and temperature do not match on chart, system
refrigerant charge may not be correct. Do not use chart to adjust
refrigerant charge.
STEP 13 —Final Checks
IMPORTANT: Before leaving job, be sure to do the following:
1. Ensure that all wiring is routed away from tubing and
sheet
metal edges to prevent rub- -through or wire pinching.
2. Ensure that all wiring and tubing is secure in unit before
adding panels and covers. Securely fasten all panels and
covers.
3. Tighten service valve stem caps to 1/12- -turn past finger
tight.
EBryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
4. Leave Owner's Manual with owner. Explain system
operation and periodic maintenance requirements outlined
in manual.
5. Fill
out Dealer Installation Checklist and place in
customer file.
Table 3—Required Liquid- -Line Temperature
Liquid
Pressure
at Service
Valve
(PSIG)
134
141
148
156
163
171
179
187
196
205
214
223
233
243
253
264
274
285
297
309
321
331
346
359
CARE AND MAINTENANCE
For continuing high performance and to minimize possible
equipment failure, periodic maintenance must be performed on
this equipment.
Frequency of maintenance may vary depending upon geographic
areas, such as coastal applications. See Users Manual for
information.
Printed in U.S.A.
Edition Date: 02/06
10
Required Subcooling Temperature
5
10
15
71
66
61
74
69
64
77
72
67
80
75
70
83
78
73
86
81
76
89
84
79
92
87
82
95
90
85
98
93
88
101
96
91
104
99
94
107
102
97
110
105
100
113
108
103
116
111
106
119
114
109
122
117
112
125
120
115
128
123
118
131
126
121
134
129
124
137
132
127
140
135
130
Catalog No. II 223R ---18---2
Replaces: II 223R--- 18--- 1
(
°F)
20
56
59
62
65
68
71
74
77
80
83
86
89
92
95
98
101
104
107
110
113
116
119
122
125
Advertisement
Table of Contents
