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BURNER FLAME'-_
_
BURNER
MANIFOLD J
Fig. 48--Burner
Flame
Table 13--Gas
Rate {Cu Ft/Hr)
SECONDS
SIZE OF TEST DIAL
SECONDS
FOR 1
I
2
5
FOR 1
REVOLUTION
cuff
cu fl
cu fl
REVOLUTION
10
360
720
1800
50
11
327
655
1636
51
12
300
600
1500
52
13
277
555
1385
53
14
257
514
1286
54
15
240
480
1200
55
16
225
450
1125
56
17
212
424
1059
57
18
200
400
1000
58
19
189
379
947
59
20
180
360
900
60
21
171
343
857
62
22
164
327
818
64
23
157
313
783
66
24
150
300
750
68
25
144
288
720
70
26
138
277
692
72
A89020
27
133
267
667
74
28
129
257
643
76
29
124
248
621
78
30
120
240
600
80
31
116
232
581
82
32
113
225
563
84
33
109
218
545
86
34
106
212
529
88
35
103
206
514
90
36
100
200
500
92
37
97
195
486
94
38
95
189
474
96
39
92
185
462
98
40
90
180
450
100
41
88
176
439
102
42
86
172
429
104
43
84
167
419
106
44
82
164
409
108
45
80
160
400
110
46
78
157
391
112
47
76
153
383
116
48
75
150
375
120
49
73
147
367
124
SIZE
OF TEST
DIAL
1
2
5
cu fl
cu fl
cu fl
72
144
360
71
141
355
69
138
346
68
136
340
67
133
333
65
131
327
64
129
321
63
126
316
62
124
310
61
122
305
60
120
300
58
116
290
56
112
281
54
109
273
53
106
265
51
103
257
50
100
250
48
97
243
47
95
237
46
92
231
45
90
225
44
88
220
43
86
214
42
84
209
41
82
205
40
80
200
39
78
196
38
76
192
38
75
188
37
74
184
36
72
180
35
71
178
35
69
173
34
68
170
33
67
167
33
65
164
32
64
161
31
62
155
30
60
150
29
58
145
EXAMPLE:
(0
2000 fi altitude)
Furnace
input
fi'om rating
plate is 100,000
Bmh.
Bm heating
input
Bmicu
ft X cu ftihr
Heating
value
of gas
975 Btuicu
1:i
Time for 1 revolution
of 2-cu fl dial
70 sec
Gas rate
103 cu ftihr (f?om Table
11)
Bm heating
input
103 X 975
100,425
Btuh
In this
example,
the
orifice
size and
manifbld
pressure
adjustment
is within
!2 percent
of the fl/mace
input rate.
SET TEMPERATURE
RISE
[NIT
DAMAGE
HAZARD
Failure
to fbllow
this caudon
may result
in overheating
d-xe
heat exchangers
or condensing
flue gases in heat exchanger
areas not designed
for condensate.
Temperature
rise must
be within
limits specified
on hlmace
rating
plate.
Recommended
operation
is at mi@oint
of rise
range
or slightly
above.
Determine
and ac[iust air temperature
rise as fbllows:
1. Place
thermometers
in return
and supply
ducts
as close
to
fi/rnace
as possible
Be sure thermon_eters
do not see heat
exchanger
so that radiant
heat does not affect
readings
This
practice
is particularly
important
with
stlaight-run
ducts.
2. When tlaern_ometer
readings
stabilize,
subtract
return-air
tern:
perature
fl'om supply-air
temperature
to detemaine
air tem-
perature
rise.
3. Acliust temperature
rise by adjusting
blower
speed.
Increase
blower
speed
to redtlce
temperature
rise.
Decrease
blower
speed to increase
temperature
rise.
ELECTRICAL
SHOCK
HAZARD
Failure
to %llow
this warning
could
result in personal
injury
or death.
Disconnect
115-v electrical
power before
changing
speed tap
4. To change
blower
motor
speed
selections
for heating
mode,
remove
blower
motor
lead J:'rom control
center HEAT
termi-
nal. (See
Fig
33)
Select
desired
blower
motor
speed
lead
fi'om
1 of the
other
motor
leads
and relocate
it to HEAT
terminal
See Table
14 for lead color identification.
Reconnect
original
lead on SPARE
terminal
Follow
this same
procedure
%r proper
selection
of (OOL
speed
selection
BLOWER
OFF DELAY
(HEAT
MODE)
The blower
offdelay
has 4 adjustable
settings
h'om 90 sec to 180
sec. (See Table
15.) The blower
off delay jumpers
are located
on
the fl/rnace
control
board
(See Fig. 33)
To change the blower
off
Table 14--Speed
Selector
FACTORY-
COLOR
SPEED
SHIPPED
CONNECTION
Black
High
Cool
Yellow
(When Present)
Medium High
Spare
Blue
Medium Low
Heat
Red
Low
Spare
White
Common
Corn
44
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