Set Temperature Rise; Set Thermostat Heat Anticipator; Gas Rate Cu Ft/Hr - Bryant SERIES A 355CAV Installation Instructions Manual

SECONDS
FOR 1
REVOLUTION
10
11
12
13
14
15
16
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19
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21
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23
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26
27
28
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33
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Set Temperature Rise

CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in component
damage.
Temperature rise must be within limits specified on unit
rating plate. Operation is within a few degrees of midpoint
of rise range when setup switch SW1- -4 is OFF.
Furnace must operate within ranges of temperature rise specified
on the furnace rating plate. Determine air temperature rise as
follows:
1. Place thermometers in return and supply ducts as near fur-
nace as possible. Be sure thermometers do not see heat ex-
changer so that radiant heat does not affect readings. This
practice is particularly important with straight- -run ducts.
2. When thermometer readings stabilize, subtract return- -air
temperature from supply- -air temperature to determine air
temperature rise.
NOTE: Temperature rise can be determined for low- -heat
operation by placing setup switch SW1- -2 on furnace control in
Table 12 – Gas Rate cu Ft/Hr
SIZE OF TEST DIAL
1 2 5
REVOLUTION
cu ft. cu ft. cu ft.
360 720 1800
327 655 1636
300 600 1500
277 555 1385
257 514 1286
240 480 1200
225 450 1125
212 424 1059
200 400 1000
189 379 947
180 360 900
171 343 857
164 327 818
157 313 783
150 300 750
144 288 720
138 277 692
133 267 667
129 257 643
124 248 621
120 240 600
116 232 581
113 225 563
109 218 545
106 212 529
103 206 514
100 200 500
97 195 486
95 189 474
92 185 462
90 180 450
88 176 439
86 172 429
84 167 419
82 164 409
80 160 400
78 157 391
76 153 383
75 150 375
73 147 367
SIZE OF TEST DIAL
SECONDS
FOR 1
1 2
cu ft. cu ft.
50 72 144
51 71 141
52 69 138
53 68 136
54 67 133
55 65 131
56 64 129
57 63 126
58 62 124
59 61 122
60 60 120
62 58 116
64 56 112
66 54 109
68 53 106
70 51 103
72 50 100
74 48 97
76 47 95
78 46 92
80 45 90
82 44 88
84 43 86
86 42 84
88 41 82
90 40 80
92 39 78
94 38 76
96 38 75
98 37 74
100 36 72
102 35 71
104 35 69
106 34 68
108 33 67
110 33 65
112 32 64
116 31 62
120 30 60
ON position. Temperature rise can be determined for
medium- -heat operation by placing setup switch SW4- -2 on
furnace control in ON position. For high- -heat operation, place
setup switch SW1- -2 and SW4- -2 in OFF position and jumper
R- -W2 on furnace control. DO NOT forget to return setup switch
to OFF position and remove R- -W2 jumper upon completion of
testing. (See Fig. 33 for switch and terminal location.)
3. This furnace is capable of automatically providing proper
airflow to maintain the temperature rise within the range
specified on furnace rating plate. If temperature rise is out-
side this range, proceed as follows:
a. Check gas input for low- -, medium- -, and high- -heat oper-
ation.
b. Check derate for altitude if applicable.
c. Check all return and supply ducts for excessive restric-
tions causing static pressure greater than 0.5- -in. wc.
d. Ensure Low Heat Rise Adjust switch SW1- -3 on furnace
control is in ON position when a bypass humidifier is
used. (See Fig. 33 for switch location.)
e. Check Troubleshooting Guide for Variable- -Speed Step
Modulating Condensing Furnaces.

Set Thermostat Heat Anticipator

When using a non- -electronic thermostat, the thermostat heat
anticipator must be set to match the amp draw of components in
59
5
cu ft.
360
355
346
340
333
327
321
316
310
305
300
290
281
273
265
257
250
243
237
231
225
220
214
209
205
200
196
192
188
184
180
178
173
170
167
164
161
155
150