PG96MSA: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
58
1. Adjust manifold pressure to obtain proper gas input rate. See
Fig. 64.
a. Refer to the correct manifold pressure table for the appropriate
model.
b. Turn gas valve ON/OFF switch to OFF.
c. Loosen set screw on manifold tower pressure tap no more than
one full turn with a 3/32-in. hex wrench, or remove the 1/8 inch
NPT plug from the manifold pressure tap on the gas valve.
d. Connect a water column manometer or similar device to
manifold pressure tap.
e. Turn gas valve ON/OFF switch to ON.
f. Manually close blower door switch.
g. Jumper R and W thermostat connections on control to start
furnace. See Fig. 37.
h. Remove regulator adjustment cap from gas valve pressure
regulator and turn adjusting screw (3/16 or smaller flat-tipped
screwdriver) counterclockwise (out) to decrease input rate or
clockwise (in) to increase input rate. See Fig. 64.
i. When correct input is obtained, replace cap that conceals gas
valve regulator adjustment screws. Main burner flame should be
clear blue, almost transparent See Fig. 63.
j. Remove jumper R to W.
A11461
Fig. 63 – Burner Flame
A170140
Standard Capacity Gas Valve with Tower Pressure Ports
A170118
26,000 BTUh Low Capacity Gas Valve with Tower Pressure Ports
Fig. 64 – Gas Valves
NOTE: Contact your HVAC distributor or gas supplier for metric gas
meter Tables, if required.
2. Verify natural gas input rate by clocking meter.
a. Turn off all other gas appliances and pilots served by the meter.
b. Jumper R to W.
CAUTION
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in reduced furnace life.
The 26,000 BTUh model has a lower nominal manifold pressure than
other models. Do not adjust the natural gas manifold pressure above
1.8-in. w.c.
The 26,000 BTUh model can be identified by the green label affixed to
the solenoid of the gas valve.
Refer to the Adjustment section for setting the manifold pressure.
USE Table 26 WHEN ADJUSTING 26,000 BTUh MODEL
MANIFOLD PRESSURE.
Burner Flame
Burner
Manifold
NOTICE
!
For 40,000 BTUh models through 120,000 BTUh models: DO NOT set
manifold pressure less than 2.8-in. w.c. (697 Pa) or more than 3.8 in.
w.c. (947 Pa) for natural gas. If required manifold pressure is outside
this range, change main burner orifices to obtain manifold pressure in
this range.
Table 24 – Gas Rate (CU ft./hr)
SEC
FOR 1
REV
SIZE OF TEST DIAL SEC
FOR 1
REV
SIZE OF TEST DIAL
1 Cu
Ft.
2 Cu
Ft.
5 Cu
Ft.
1 Cu
Ft.
2 Cu
Ft.
5 Cu
Ft.
10 360 720 1800 55 65 131 327
11 327 655 1636 56 64 129 321
12 300 600 1500 57 63 126 316
13 277 555 1385 58 62 124 310
14 257 514 1286 59 61 122 305
15 240 480 1200 60 60 120 300
16 225 450 1125 62 58 116 290
17 212 424 1059 64 56 112 281
18 200 400 1000 66 54 109 273
19 189 379 947 68 53 106 265
20 180 360 900 70 51 103 257
21 171 343 857 72 50 100 250
22 164 327 818 74 48 97 243
23 157 313 783 76 47 95 237
24 150 300 750 78 46 92 231
25 144 288 720 80 45 90 225
26 138 277 692 82 44 88 220
27 133 267 667 84 43 86 214
28 129 257 643 86 42 84 209
29 124 248 621 88 41 82 205
30 120 240 600 90 40 80 200
31 116 232 581 92 39 78 196
32 113 225 563 94 38 76 192
33 109 218 545 96 38 75 188
34 106 212 529 98 37 74 184
35 103 206 514 100 36 72 180
36 100 200 500 102 35 71 178
37 97 195 486 104 35 69 173
38 95 189 474 106 34 68 170
39 92 185 462 108 33 67 167
40 90 180 450 110 33 65 164
41 88 176 439 112 32 64 161
42 86 172 429 116 31 62 155
43 84 167 419 120 30 60 150
44 82 164 409 124 29 58 145
45 80 160 400 129 28 56 140
46 78 157 391 133 27 54 135
47 76 153 383 138 26 52 130
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