38
Table 12. Gas Flow Rate
Primary Gas Valve –
The gas valve controls the
flow of gas to all of the burners. When the gas
valve is energized it automatically opens and
regulates the gas pressure in the manifold.
Secondary Gas Valve –
The gas valve controls
the flow of gas to the high fire burners only.
Pressure Switch –
The pressure switch veri-
fies that the inducer is drawing the combustion
gases through the heat exchanger. It also
senses a blocked condensate drain condition.
Vent Pressure Switch –
The vent pressure
switch reacts to blockage in the vent or combus-
tion air piping.
Supply Air Limit Switch –
The supply air limit
switch prevents the air temperature leaving the
furnace from exceeding the maximum outlet air
temperature.
Vent Safety Switch –
The vent safety switch
shuts the furnace down if the outlet flue gas
temperature increases above 160°F. This switch
protects the plastic flue system and the inducer
from over-temperature conditions.
Flame Roll-Out Switch –
This switch provides
flame roll-out protection to the furnace and
combustion air inlet pipe.
MAINTENANCE
It is recommended that the furnace be checked
yearly. At a minimum, this check should include
the following items.
!
WARNING:
To avoid electric shock, personal injury,
or death, disconnect the electric power
before performing any maintenance.
!
WARNING:
Holes in the vent pipe or heat exchanger
can cause products of combustion to
enter the home. Replace the vent pipe
or heat exchanger if leaks are found.
Failure to prevent products of com-
bustion from being circulated into the
living space can create potentially haz-
ardous conditions including carbon
monoxide poisoning that could result
in personal injury or death.
TIME FOR
TIME FOR
ONE REVOLUTION
ONE REVOLUTION
(SECONDS)
1
5
10
(SECONDS)
24
150
750
1500
74
26
138
692
1385
76
28
129
643
1286
78
30
120
600
1200
80
32
113
563
1125
82
34
106
529
1059
84
36
100
500
1000
86
38
95
474
947
88
40
90
450
900
90
42
86
429
857
92
44
82
409
818
94
46
78
391
783
96
48
75
375
750
98
50
72
360
720
100
52
69
346
692
102
54
67
333
667
104
56
64
321
643
106
58
62
310
621
108
60
60
300
600
110
62
58
290
581
112
64
56
281
563
114
66
55
273
545
116
68
53
265
529
118
70
51
257
514
120
72
50
250
500
GAS FLOW RATE (CUBIC FEET PER HOUR)
CUBIC FEET PER REVOLUTION OF
METER
1
5
10
49
243
486
47
237
474
46
231
462
45
225
450
44
220
439
43
214
429
42
209
419
41
205
409
40
200
400
39
196
391
38
191
383
38
188
375
37
184
367
36
180
360
35
176
353
35
173
346
34
170
340
33
167
333
33
164
327
32
161
321
32
158
316
31
155
310
31
153
305
30
150
300
CUBIC FEET PER REVOLUTION OF
METER
Summary of Contents for TC060
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