State GPG 81 370NEA - Manual (Page 27)

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table 9.
nominal start-up specifications
model gpg 81-140 gpg 81-199 gpg 81-270 gpg 81-370
max. Gas line Press.(W.C.) Nat. Gas - 10.5” W.C./Prop. Gas -13.0”
manifold Press. (W.C.)
Natural Gas 3.5 3.5 3.5 3.5
Propane Gas 3.5 3.5 3.5 3.5
Orifice
Natural Gas 0.24 0.308 0.386 0.532
Propane Gas 0.209 0.257 0.302 0.368
Air Shutter Setting No.
Natural Gas 2.5 5.75 4 3
Propane Gas 4.5 10 4 8.5
CO% 9.2% 9.8% 7.5% 8.0%
CO Parts Per million <200 <200 <200 <200
Gross Stack Temp. (°F) 305 338 405 488
Breeching Press.(inches W.C.) ranges from - 0.02 to - 0.07 inches water column
figure 22.
setting burner operation
make combustion measurements and corresponding air
shutter adjustments per Table 9. Combustion results from
Table 9 are for natural gas models.
• Proceed with CO2 test of the flue gases with an Orsat or
other similar combustion test equipment. If the CO2 content
is within range (see Table 9) no adjustment of the air shutter
is required. Flue gas temperature and CO2 measurements
should be repeated 3 times to ensure accurate readings.
• Check the flue gas temperature ahead of the barometric
damper. See Table 9 (net temp. = gross temp. = ambient temp.)
• Check breeching pressure and the barometric damper control
to make sure it operates freely and there is no discharge of
flue products into the room.
• Check main burner operation by cycling on and off the
thermostat dial several times. Wait 1 minute between cycles
for regulators and sequencing to reset.
When all adjustments are satisfactory:
• Fill in part no. 196793 “Start-up” form.
• Adjust thermostat temperature dial to deliver desired water
temperature at point of use.
• For subsequent normal starting and shutoff procedure, see
lIGHTING and OPerATION lABel on page 25.