Gas Rate (Cu Ft/Hr) At Full Input - York TP9C Series Installation Manual

1083292-UIM-A-0114
NOTICE
If orifice hole appears damaged or it is suspected to have been
redrilled, check orifice hole with a numbered drill bit of correct size.
Never redrill an orifice. A burr-free and squarely aligned orifice hole
is essential for proper flame characteristics.
DO NOT bottom out gas valve regulator adjusting screw. This can
result in unregulated manifold pressure and result in excess over-
fire and heat exchanger failures.
Verify natural gas input rate by clocking meter.
1. Turn off all other gas appliances and pilots.
2. Run furnace for a minimum of 3 minutes in heating operation.
3. Measure time (in sec) for gas meter to complete 1 revolution and
note reading. The 2 cubic feet dial provides a more accurate mea-
surement of gas flow.
4. Refer to Table 14 for cubic feet of gas per hour.
Table 14: Gas Rate (CU FT/HR) at Full Input
Seconds For
1 Revolution
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
36
Size of Test Dial
1 Cu Ft 2 Cu Ft 5 Cu Ft
360 720
327 655
300 600
277 555
257 514
240 480
225 450
212 424
200 400
189 379
180 360
171 343
164 327
157 313
150 300
144 288
138 277
133 267
129 257
124 248
120 240
116 232
113 225
109 218
106 212
103 206
100 200
97 195
95 189
92 185
90 180
88 176
86 172
84 167
82 164
80 160
78 157
76 153
75 150
73 147
5. Multiply cubic feet per hour by heating valve (BTU/ft
input.
If clocked rate does not match the input rate from the unit nameplate.
follow steps in next section to adjust the manifold pressure. Repeat
steps 2 - 5 until correct input is achieved.
Be sure to relight any gas appliances that were turned off at the
start of this input check.
HIGH ALTITUDE NATURAL GAS ORIFICE
CONVERSION
The National Fuel Gas Code requires that gas appliances installed
above 2,000 feet elevation have their inputs de-rated by 4% per 1,000
feet above sea level. The modulating furnaces automatically de-rate for
altitude by measuring the inducer blower pressure and using that to
determine if there is adequate air to support good combustion. If there
is not enough combustion air to properly support 100% of the furnace
nameplate input rate, the control will reduce the input to the point that
there will be good combustion.
Seconds For
1 Revolution
1800 50
1636 51
1500 52
1385 53
1286 54
1200 55
1125 56
1059 57
1000 58
947 59
900 60
857 62
818 64
783 66
750 68
720 70
692 72
667 74
643 76
621 78
600 80
581 82
563 84
545 86
529 88
514 90
500 92
486 94
474 96
462 98
450 100
439 102
429 104
419 106
409 108
400 110
391 112
383 116
375 120
367
3
Size of Test Dial
1 Cu Ft 2 Cu Ft 5 Cu Ft
72 144
71 141
69 138
68 136
67 133
65 131
64 129
63 126
62 124
61 122
60 120
58 116
56 112
54 109
53 106
51 103
50 100
48 97
47 95
46 92
45 90
44 88
43 86
42 84
41 82
40 80
39 78
38 76
38 75
37 74
36 72
35 71
35 69
34 68
33 67
33 65
32 64
31 62
30 60
Johnson Controls Unitary Products
) to obtain
360
355
346
340
333
327
321
316
310
305
300
290
281
273
265
257
250
243
237
231
225
220
214
209
205
200
196
192
188
184
180
178
173
170
167
164
161
155
150