Verifying And Adjusting Temperature Rise; Verifying Burner Operation; Verifying Operation Of The Supply Air Limit Switch - Nordyne TE Series 95 Installation Instructions Manual

airfl ow rate for the capacity. Detailed operation is
described in the cooling unit installation instruc-
tions and control manual.
Verifying and Adjusting
Temperature Rise
Verify that the temperature rise through the
furnace is within the range specifi ed on the
furnace rating plate. Temperature rises outside
the specifi ed range could result in premature
heat exchanger failure.
Place temperature measuring device in the return
and supply air stream as close to the furnace
as possible. The device on the supply air side
must be shielded from direct radiation from the
heat exchanger to avoid false readings. Adjust
all registers and duct dampers to the desired
position and run the furnace for fi fteen minutes
before taking any temperature readings. The
temperature rise is the difference between the
supply and return air temperatures.

Verifying Burner Operation

To verify operation of the burners, make sure
that the blower compartment door is in place
and that there is power to the furnace. Set
GAS FLOW RATE (CUBIC FEET PER HOUR)
CUBIC FEET PER REVOLUTION OF
TIME FOR
METER
ONE REVOLUTION
(SECONDS)
1
24 150
26 138
28 129
30 120
32 113
34 106
36 100
38 95
40 90
42 86
44 82
46 78
48 75
50 72
52 69
54 67
56 64
58 62
60 60
62 58
64 56
66 55
68 53
70 51
72 50
the thermostat above room temperature and
observe the ignition sequence. The fl ame can
be observed through the small clear window
on the burner box. The fl ames should be blue,
without yellow tips. Flames should extend from
each burner without lifting, curling, or fl oating.
After verifying ignition, set the thermostat below
room temperature and verify that the burner fl ame
extinguishes completely.
Verifying Operation of the Supply
Air Limit Switch
To verify operation of the supply air limit switch,
make sure that the blower door is in place and
that there is power to the furnace. Completely
block the return airfl ow to the furnace by install-
ing a close-off plate in place of or upstream
of the fi lter(s). Set the thermostat above room
temperature and verify that the Sequence of
Operation is as described in these instructions.
The supply air limit switch should function to
turn off the gas valve within approximately fi ve
minutes. The circulating air and combustion blow-
ers should continue to run when the supply air
limit switch opens. Remove the close-off plate
immediately after the supply air limit switch opens.
If the furnace operates for more than fi ve minutes
with no return air, set the thermostat below room
TIME FOR
ONE REVOLUTION
(SECONDS)
5 10
750 1500
692 1385
643 1286
600 1200
563 1125
529 1059
500 1000
474 947
450 900
429 857
409 818
391 783
375 750
360 720
346 692
333 667
321 643
310 621
300 600
290 581
281 563
273 545
265 529
257 514
250 500
Table 11. Gas Flow Rate
CUBIC FEET PER REVOLUTION OF
METER
1
74 49
76 47
78 46
80 45
82 44
84 43
86 42
88 41
90 40
92 39
94 38
96 38
98 37
100 36
102 35
104 35
106 34
108 33
110 33
112 32
114 32
116 31
118 31
120 30
5 10
243 486
237 474
231 462
225 450
220 439
214 429
209 419
205 409
200 400
196 391
191 383
188 375
184 367
180 360
176 353
173 346
170 340
167 333
164 327
161 321
158 316
155 310
153 305
150 300
29