Tempstar F97CMN Installation, Start-Up, Operating And Service And Maintenance Instructions page 54

F97CMN and G97CMN: Installation, Start-up, Operating and Service and Maintenance Instructions
3. Jumper R to W/W1 and W2. Run furnace for 3 minutes in
maximum heat operation.
4. Measure time (in sec) for gas meter to complete one revolution and
note reading. The 2 or 5 cubic feet dial provides a more accurate
measurement of gas flow.
5. Refer to Table 17 for cubic ft. of gas per hr. Multiply gas rate cu
ft./hr by heating value (BTUh/cu ft.) to obtain input rate.
6. If clocked rate does not match required input from Step 5, increase
manifold pressure to increase input or decrease manifold pressure
to decrease input. Repeat steps 3 through 5 until correct maximum
heat input is achieved. See
NOTE: Setup switches SW1-2 must be ON and SW4-2 must be OFF.
This keeps furnace locked in minimum heat operation when R to W/W1
is energized. Repeat items 3 through 6 for minimum heat operation until
minimum heat input is achieved.
7. Remove jumpers across thermostat connections to terminate the
call for heat. Wait until the blower off delay is completed then reset
115-v power to furnace.
8. Restore furnace to normal operating condition.
Burner Flame
Manifold
Fig. 63 – Burner Flame
9. Remove jumpers across thermostat connections to terminate the
call for heat. Wait until the blower off delay is completed.
10. Disconnect 115 VAC power to furnace.
11. Turn gas valve ON/OFF switch to OFF.
12. Remove water column manometer or similar device from manifold
pressure tap.
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Manifold pressure tap set screw must be tightened or ⅛-in. NPT pipe
plug must be installed to prevent gas leaks.
13. Tighten set screw on manifold tower pressure tap with 3/32-in hex
wrench, or if 1/8-in. NPT plug was removed, apply pipe dope
sparingly to end of plug and reinstall in the gas valve.
14. Turn gas valve ON/OFF switch to ON.
15. Move setup SW1-2 on furnace control to position required for
attached thermostat (OFF for single-stage thermostats, ON for
two-stage thermostats).
16. Check for gas leaks and verify furnace operation.
.
Table 17 – Gas Rate (CU ft./hr)
SIZE OF TEST DIAL
SECONDS
FOR 1 REV
1 Cu 2 Cu 5 Cu
Ft. Ft.
10 360 720 1800
11 327 655 1636
12 300 600 1500
13 277 555 1385
14 257 514 1286
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 57.
Burner
SIZE OF TEST
DIAL
SECONDS
FOR 1 REV
1 Cu 2 Cu
Ft. Ft. Ft.
50 72 144
51 71 141
52 69 138
53 68 136
54 67 133
Table 17 – Gas Rate (CU ft./hr) (Continued)
240
15
225
16
212
17
200
18
189
19
180
20
21 171
22 164
23 157
24 150
25 144
26 138
27 133
28 129
29 124
30 120
31 116
32 113
33 109
106
34
103
35
100
36
97
37
A11461
95
38
92
39
90
40
88
41
86
42
84
43
82
44
80
45
78
46
76
47
75
48
73
49
Adjust Temperature Rise
NOTE: Blower door must be installed when taking temperature rise
reading. Leaving blower door off will result in incorrect temperature
measurements, due to possible changes in duct static pressure and
airflow.
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in:
S Overheating the heat exchangers or condensing flue gases in heat
exchanger areas not designed for condensate.
S Shortened furnace life
5 Cu
S Component damage.
Ft.
Temperature rise must be within limits specified on furnace rating plate.
360
Recommended operation is at midpoint of rise range or slightly above.
355
When setup switch SW1-4 is ON, operation will be near the high end of
346
the rise range for improved comfort.
340
Furnace must operate within ranges of temperature rise specified on the
333
furnace rating plate. Determine air temperature rise as follows:
54
480 1200 55 65
450 1125 56 64
424 1059 57 63
400 1000 58 62
379 947 59 61
360 900 60 60
343 857 62 58
327 818 64 56
313 783 66 54
300 750 68 53
288 720 70 51
277 692 72 50
267 667 74 48
257 643 76 47
248 621 78 46
240 600 80 45
232 581 82 44
225 563 84 43
218 545 86 42
212 529 88 41
206 514 90 40
200 500 92 39
195 486 94 38
189 474 96 38
185 462 98 37
180 450 100 36
176 439 102 35
172 429 104 35
167 419 106 34
164 409 108 33
160 400 110 33
157 391 112 32
153 383 116 31
150 375 120 30
147 367
CAUTION
!
131 327
129 321
126 316
124 310
122 305
120 300
116 290
112 281
109 273
106 265
103 257
100 250
97 243
95 237
92 231
90 225
88 220
86 214
84 209
82 205
80 200
78 196
76 192
75 188
74 184
72 180
71 178
69 173
68 170
67 167
65 164
64 161
62 155
60 150