Bryant Condensing Gas 355CAV 用户手册
58
Table 12 – Gas Rate cu Ft/Hr
SECONDS
SIZE OF TEST DIAL
SECONDS
SIZE OF TEST DIAL
FOR 1
1
2
5
FOR 1
1
2
5
REVOLUTION
cu ft
cu ft
cu ft
REVOLUTION
cu ft
cu ft
cu ft
10
360
720
1800
50
72
144
360
11
327
655
1636
51
71
141
355
12
300
600
1500
52
69
138
346
13
277
555
1385
53
68
136
340
14
257
514
1286
54
67
133
333
15
240
480
1200
55
65
131
327
16
225
450
1125
56
64
129
321
17
212
424
1059
57
63
126
316
18
200
400
1000
58
62
124
310
19
189
379
947
59
61
122
305
20
180
360
900
60
60
120
300
21
171
343
857
62
58
116
290
22
164
327
818
64
56
112
281
23
157
313
783
66
54
109
273
24
150
300
750
68
53
106
265
25
144
288
720
70
51
103
257
26
138
277
692
72
50
100
250
27
133
267
667
74
48
97
243
28
129
257
643
76
47
95
237
29
124
248
621
78
46
92
231
30
120
240
600
80
45
90
225
31
116
232
581
82
44
88
220
32
113
225
563
84
43
86
214
33
109
218
545
86
42
84
209
34
106
212
529
88
41
82
205
35
103
206
514
90
40
80
200
36
100
200
500
92
39
78
196
37
97
195
486
94
38
76
192
38
95
189
474
96
38
75
188
39
92
185
462
98
37
74
184
40
90
180
450
100
36
72
180
41
88
176
439
102
35
71
178
42
86
172
429
104
35
69
173
43
84
167
419
106
34
68
170
44
82
164
409
108
33
67
167
45
80
160
400
110
33
65
164
46
78
157
391
112
32
64
161
47
76
153
383
116
31
62
155
48
75
150
375
120
30
60
150
49
73
147
367
Set Temperature Rise
UNIT DAMAGE HAZARD
Failure to follow this caution may result in component
Failure to follow this caution may result in component
damage.
Temperature rise must be within limits specified on unit
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.
CAUTION
!
Furnace must operate within ranges of temperature rise specified
on the furnace rating plate. Determine air temperature rise as
on the furnace rating plate. Determine air temperature rise as
follows:
1. Place thermometers in return and supply ducts as near
furnace as possible. Be sure thermometers do not see heat
exchanger so that radiant heat does not affect readings.
exchanger so that radiant heat does not affect readings.
This practice is particularly important with straight--run
ducts.
ducts.
2. When thermometer readings stabilize, subtract return--air
temperature from supply--air temperature to determine air
temperature rise.
temperature rise.
NOTE:
Temperature rise can be determined for low--heat
operation by placing setup switch SW1--2 on furnace control in
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.)
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
outside this range, proceed as follows:
outside this range, proceed as follows:
a. Check gas input for low--, medium--, and high--heat
operation.
b. Check derate for altitude if applicable.
c. Check all return and supply ducts for excessive
restrictions causing static pressure greater than 0.5--in.
wc.
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
When using a non--electronic thermostat, the thermostat heat
anticipator must be set to match the amp draw of components in
the R--W/W1 circuit. Accurate amp draw measurements can be
the R--W/W1 circuit. Accurate amp draw measurements can be
obtained only at the thermostat subbase terminals R and W.
The thermostat and anticipator should NOT be in the circuit while
measuring current. If thermostat has no subbase, the thermostat
The thermostat and anticipator should NOT be in the circuit while
measuring current. If thermostat has no subbase, the thermostat
must be disconnected from R and W/W1 wires during current
measurement.
Fig. 63 illustrates an easy method of obtaining thermostat amp
measurement.
Fig. 63 illustrates an easy method of obtaining thermostat amp
draw measurements. The amp reading should be taken after
blower motor has started and furnace is operating in low--heat.
blower motor has started and furnace is operating in low--heat.
1. To operate furnace in low--heat, turn setup switch SW1--2
to ON position (See Fig. 33) and connect ammeter leads
across thermostat subbase R--W.
2. See thermostat manufacturer’s instructions for adjusting
the heat anticipator and for varying heating cycle length.
355C
A
V