C. indoor airflow & airflow adjustments, Table iv-heating performance pressures, Table v-cooling performance pressures – Bryant 542E User Manual
Page 9: Caution
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TABLE IV-HEATING PERFORMANCE PRESSURES
Air Temp at
Indoor
Coil
Inlet l°F DB|
Pressure
Designation
(Psig)
5426024
542E030
542E036
Air Temperature at Outdoor Coil
F°0B
Air Temperature at Outdoor Coil
°F0B
Air Temperature at Outdoor Coil
°FDB
60
50
40
30
20
10
0
- t o
60
50
40
30
20
10
0
-10
60
50
40
30
20
10
0
-10
65
High Side 250 229 209 190 172 155 140 127 238 218 201 184 169 155 144 134 232 214 198 183 170 158 149 142
Low Side
69
59
49
41
33
25
18
14
71
60
50
41
32
24
18
13
64
52
46
38
31
25
18
13
70
High Side 268 243 220 199 180 162 147 134 251 231 211 195 179 165 153 142 247 230 213 198 184 171 161 152
Low Side
70
60
50
42
34
26
19
15
72
61
51
42
33
25
19
14
65
53
47
39
31
25
19
13
75
High Side 280 256 233 211 190 172 155 140 266 246 226 207 190 176 162 151 261 243 225 209 195 182 171 162
Low Side
71
61
51
43
35
27
20
16
73
62
52
43
34
26
20
15
66
54
48
40
32
26
19
14
Air Temp at
Indoor
Coil
Inlet (°F OBI
Pressure
Designation
(PsigI
542E042
542E04B
5420060 S 542E060
Air Temperature at Outdoor Coil
°FDB
Air Temperature at Outdoor Coil
°FDB
Air Temperature at Outdoor Coil
°FDB)
60
50
40
30
20
10
0
-10
60
50
40
30
20
10
0
-10
60
50
40
30
20
10
0
-10
65
High Side 254 234 216 193 171 159 148 136 262 237 214 193 174 158 144 134 268 238 210 186 166 151 142 136
Low Side
71
62
50
42
32
24
18
14
64
56
48
40
33
26
19
13
66
56
47
39
32
24
19
13
70
High Side 268 250 230 205 183 169 156 144 278 251 226 204 184 166 154 146 284 252 224 198 178 164 154 146
Low Side
72
63
51
43
33
25
18
14
65
57
49
41
34
27
20
13
67
57
48
40
32
25
19
13
75
High Side 283 266 243 218 194 180 166 153 290 266 242 220 201 184 169 158 298 268 238 212 190 174 162 156
Low Side
73
64
52
44
34
26
19
14
66
58
50
42
35
28
21
14
68
58
49
41
33
25
20
14
TABLE V-COOLING PERFORMANCE PRESSURES
Air
Tem p
at
Indoor
Coil
Inlet (°FW BI
Pressure
Designation
IPsigi
542E024
542E030
54ZE036
Air T em p a t O utdoor C oil i°F D BI
Air T em p a t O utdoor C oil i°FDBI
Air T em p a t O utdoor C oil l°FDBI
65
70
75
BO
B5
90
95
100
105
110
65
70
75
60
85
90
95
100
105
110
65
70
75
80
85
90
95
100
105
110
55
High S ide
157
174
190
207
224
240
258
276
293
313
150
166
181
196
212
226
246
264
282
302
182
196
211
227
242
259
276
294
312
332
Low Side
58
59
60
61
62
63
64
66
67
68
60
62
63
65
67
69
71
73
75
77
67
69
70
72
74
75
76
78
79
81
50
High S ide
162
179
195
212
228
244
261
279
296
315
153
169
185
200
216
230
250
268
286
306
185
199
215
231
246
263
280
298
316
336
Low Side
64
65
66
67
68
69
70
71
73
74
63
65
66
68
70
72
75
77
79
81
69
' 71
72
74
76
77
79
80
82
83
65
High S ide
168
185
200
216
232
247
264
282
298
317
157
173
188
204
220
235
255
273
291
311
188
203
219
235
251
268
285
303
321
341
Low Side
70
71
72
73
75
76
77
78
79
80
67
69
70
72
74
76
79
81
83
85
71
73
74
76
78
80
81
83
85
86
70
High S ide
173
191
206
223
239
253
270
288
304
324
160
177
192
208
224
240
259
277
295
315
192
207
223
239
255
273
290
308
326
346
Low Side
77
78
79
80
81
82
83
84
86
87
70
72
74
76
78
80
83
85
87
89
74
76
77
79
81
83
84
86
88
89
75
High S ide
175
192
209
227
242
260
278
294
315
336
164
180
196
212
228
244
264
282
300
320
196
212
228
244
260
278
296
314
332
352
Low Side
84
85
86
87
88
90
91
93
94
95
74
76
78
80
82
84
87
89
91
93
79
81
83
84
86
88
89
91
93
95
Air
Tem p
at
indoor
Coil
Inlet l°FW BI
Pressure
Designation
IPsigi
542E042
542E048
5420060 8 5 42E060
Air T em p a t O utdoor C oil (°F O B)
Air T em p a t O utdoor C oil l°F D BI
Air T em p a t O utdoor C oil l°FDB|
65
70
75
80
85
90
95
100
105
110
65
70
75
80
85
90
95
100
105
110
65
70
75
60
B5
90
95
100
105
110
55
High S ide
165
179
192
206
222
237
254
270
289
308
178
192
207
224
238
255
272
291
308
330
176
189
202
217
233
249
266
283
300
320
Low Side
60
62
63
65
67
68
70
72
74
75
61
62
63
65
66
68
70
72
74
76
59
61
62
63
65
67
68
70
72
74
60
High S ide
169
183
196
210 226
241
258
275
293
312
183
197
212
229
243
260
277
296
314
335
180
193
207
222
237
254
270
287
305
324
Low Side
64
66
67
69 70
72
74
75
77
79
65
66
67
69
70
72
74
76
78
80
63
65
66
67
68
70
71
73
75
77
65
High S ide
173
187
201
215
231
246
263
280
298
317
188
203
218
235
249
266
283
302
320
340
185
198
212
227
242
259
275
292
310
329
Low Side
68
69
71
73
74
76
78
79
81
83
69
70
71
73
74
76
78
80
82
84
67
69
70
71
72
74
75
76
78
80
70
High S ide
177
191
205
220
235
251
268
285
303
322
193
208
223
240
254
271
288
307
326
345
191
205
219
234
250
266
283
301
319
338
Low Side
72
73
75
77
78
80
82
83
85
87
73
74
'75
77
78
80
82
84
86
88
71
73
74
75
77
79
80
81
83
85
75
High S ide
181
196
210
225
240
256
273
290
308
327
198
214
229
246
260
277
294
312
332
350
198
212
227
242
258
274
292
310
328
346
Low Side
76
77
79
81
82
84
86
87
89
91
77
78
80
81
83
84
86
88
90
92
76
77
79
80
82
84
85
87
89
91
5. Evaluate system performance and refrigerant charge
level by comparing recorded readings with unit operat
ing pressure/temperature tag.
6. When necessary, make slight adjustment to refrigerant
charge. If a substantial adjustment is indicated, deter
mine abnormal condition in system that is causing inac
curate readings, such as insufficient airflow across
either or both coils.
CAUTION:
If it i.-^ dcri-rrniin-d thaï ihe problem i' ai; o\cr
charged or undercharged unit’when operating in the heat
ing mode, the refrigerant system should be evacuated and
recharged by adding the exact amount of R-22 refrigerant as
shown on the unit rating plate. A volumetric charging
cvliiuler or ac'. uraie .•fcoie should be u.~ed. \V her. operating in
the cooling mode, the operatiiig pre.ssiin' tempierature tag
may be used to adjust the charge.
C. Indoor Airflow & Airflow Adjustments
Model 542D and 542E units are equipped with direct-drive
blower motors. All motors have a high- and low-speed con
nection except for 460-V motors which have only a high
speed connection.
The system airflow for all units (except 460-V) can be
changed, when necessary, by changing the blower motor
speed connection from the factory setting to the unused
speed connection. The factory setting is indicated on the
unit wiring label.
CAUTION:
The recommended airflow is 400 to 450 ftVmin
per each 12,000 Btuh of unit capacity. Inadequate airJlmv
can cause unsatisfactory operation and performance. Cer
tain unit./heater combinations can only be used with high
speed blower operation. See electric heater information
Table VI shows the air delivery performance of all units at
various external static pressures. Determine the airflow for
the system being installed as follows:
1. Start unit and measure static pressure in duct system at
unit.
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