Set Thermostat Heat Anticipator; Check Safety Controls - Bryant 383KAV Installation, Start-Up, And Operating Instructions Manual

TABLE 6—MODEL 383KAV ORIFICE SIZE* AND MANIFOLD PRESSURE FOR CORRECT INPUT
(Tabulated Data Based on 22,000 Btuh per Burner, Derated 4 Percent per 1000 Ft Above Sea Level)
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
575
600
9001 625
650
to 675
700
10,000 725
750
775
* Orifice sizes shown in BOLD are factory installed.
CAUTION: DO NOT redrill orifices. Improper drilling
(burrs, out-of-round holes, etc.) can cause excessive
burner noise and misdirection of burner flames. This can
result in flame impingement of burners and heat exchang-
ers, causing failures.
TABLE 7—ALTITUDE DERATE MULTIPLIER FOR U.S.A.
ALTITUDE PERCENT
(FT) OF DERATE
0—2000 0
2001—3000 8—12
3001—4000 12—16
4001—5000 16—20
5001—6000 20—24
6001—7000 24—28
7001—8000 28—32
8001—9000 32—36
9001—10,000 36—40
* Derate multiplier factor is based on midpoint altitude for altitude range.
CAUTION: Recheck temperature rise. It must be within
air temperature rise range specified on furnace rating
plate. Recommended operation is at midpoint of rise or
above.

3. Set thermostat heat anticipator.

The thermostat heat anticipator must be set to match the
amp draw of the electrical components in the R-W circuit.
Accurate amp draw readings can be obtained at thermostat
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
43 2.7 43
43 2.5 43
43 2.3 43
43 2.1 43
48 3.7 43
48 3.4 48
49 3.8 48
49 3.5 49
49 3.3 49
A93059
BURNER
ORIFICE
DERATE MULTIPLIER
FACTOR FOR U.S.A*
1.00
0.90
0.86
0.82
0.78
0.74
0.70
0.66
0.62
—16—
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
2.8 43 2.9
2.6 43 2.7
2.4 43 2.4
2.2 43 2.3
2.0 43 2.1
3.6 48 3.7
3.3 48 3.4
3.6 49 3.8
3.4 49 3.5
TABLE 8—GAS RATE (CU FT/HR)
SECONDS
TEST DIAL
FOR 1
1
REVOLUTION
cu ft
10 360
11 327
12 300
13 277
14 257
15 240
16 225
17 212
18 200
19 189
20 180
21 171
22 164
23 157
24 150
25 144
26 138
27 133
28 129
29 124
30 120
31 116
32 113
33 109
34 106
35 103
36 100
37 97
38 95
39 92
40 90
41 88
42 86
43 84
44 82
45 80
46 78
47 76
48 75
49 73
subbase terminals R and W. Fig. 14 illustrates an easy
method of obtaining the actual amp draw. The amp reading
should be taken after the blower motor has started. See the
thermostat manufacturer's instructions for adjusting the
heat anticipator and for varying the heating cycle length.
NOTE: When using an electronic thermostat, set the cycle rate for
3 cycles per hr.
E. Check Safety Controls
The flame sensor, gas valve, and pressure switch were all checked
in the Start-up Procedures section as part of normal operation.
1. Check primary limit control.
This control shuts off the combustion control system and
energizes the circulating-air blower motor if the furnace
overheats.
(Continued)
0.64
Orifice Manifold Orifice
No. Pressure No.
43 3.0 43
43 2.7 43
43 2.5 43
43 2.3 43
43 2.2 43
43 2.0 43
48 3.5 48
48 3.3 48
49 3.6 49
SIZE OF
SECONDS
FOR 1
2 5 1
REVOLUTION
cu ft cu ft cu ft
720 1800 50 72
655 1636 51 71
600 1500 52 69
555 1385 53 68
514 1286 54 67
480 1200 55 65
450 1125 56 64
424 1059 57 63
400 100 58 62
379 947 59 61
360 900 60 60
343 857 62 58
327 818 64 56
313 783 66 54
300 750 68 53
288 720 70 51
277 692 72 50
267 667 74 48
257 643 76 47
248 621 78 46
240 600 80 45
232 581 82 44
225 563 84 43
218 545 86 42
212 529 88 41
206 514 90 40
200 500 92 39
195 486 94 38
189 474 96 38
185 462 98 37
180 450 100 36
176 439 102 35
172 429 104 35
167 419 106 34
164 409 108 33
160 400
110 33
157 391
112 32
153 383
116 31
150 375
120 30
147 367
0.66
Manifold
Pressure
3.1
2.8
2.6
2.4
2.2
2.1
3.6
3.4
3.7
SIZE OF
TEST DIAL
2 5
cu ft cu ft
144 360
141 355
138 346
136 340
133 333
131 327
129 321
126 316
124 310
122 305
120 300
116 290
112 281
109 273
106 265
103 257
100 250
97 243
95 237
92 231
90 225
88 220
86 214
84 209
82 205
80 200
78 196
76 192
75 188
74 184
72 180
71 178
69 173
68 170
67 167
65 164
64 161
62 155
60 150