!
FIRE AND/OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death, and/or property damage.
Do NOT attempt to light the burner with a match or flame of any kind.
HEATING INPUT RATE CHECK
The gas input to the unit is determined by measuring the gas flow at the meter. Measuring gas flow at the meter is recommended for natural gas units. To measure the heating input, perform the following steps:
1.Turn off all other gas appliances that use the same meter.
2.Turn off gas supply to unit and attach manifold pressure gauge as instructed in the ”Gas Valve Adjustment” section.
3.With gas ON to the unit and the unit operating, record the number of seconds for the gas meter dial to make one revolution.
4.Divide number of seconds in Step 3 into 3600 (number of seconds in 1 hour).
5.Multiply result of Step 4 by the number of cubic feet shown for one revolution of the meter dial to obtain the cubic feet of gas flow per hour.
6.Multiply result of Step 5 by Btu heating value of gas to obtain total measured input in Btu/hr. Compare this input rate with the Required Input Rate for the installation altitude, as shown in Table 3. Consult with local gas supplier if the heating value of gas is not known.
Example: Assume that the size of the meter dial is 1 cu. ft., one revolution takes 44 seconds, and the heating value of the gas is 1020 Btu/ft3. Proceed as follows:
1.38 sec. To complete 1 revolution
2.3600/38 = 94.7
3.94.7 x 1 = 94.7
4.94.7 x 1020 = 96,632 Btu/hr
For this example, the nameplate input is 100,000 Btu/hr, so only a minor change in manifold pressure is required. In no case should the final manifold pressure vary more than
Table 3 |
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| Required Input Rate for All Models |
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| Required Input Rate of Furnace Converted to Natural Gas (Btu/hr) |
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| Elevation Above Sea Level (feet) |
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| "040" or "B" | 40,000 | 35200 | 33600 | 32000 | 30400 |
| 28800 | 27200 |
| 25600 | 24000 |
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| "060" or "C" | 60,000 | 52800 | 50400 | 48000 | 45600 |
| 43200 | 40800 |
| 38400 | 36000 |
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| "080" or "D" | 80,000 | 70400 | 67200 | 64000 | 60800 |
| 57600 | 54400 |
| 51200 | 48000 |
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| "100" or "E" | 100,000 | 88000 | 84000 | 80000 | 76000 |
| 72000 | 68000 |
| 64000 | 60000 |
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| "120" or "F" | 120,000 | 105600 | 100800 | 96000 | 91200 |
| 86400 | 81600 |
| 76800 | 72000 |
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| "140" or "G" | 140,000 | 123200 | 117600 | 112000 | 106400 |
| 100800 | 95200 |
| 89600 | 84000 |
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| For PGF3, PGX3, and PDX3 models, heating model size is indicated by the numbers in the 5th, 6th, and 7th characters in the model number. | ||||||||||||
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| For PGF, PGC, PGS models, heating model size is indicated by the numbers in the 8th, 9th, and 10th characters in the model number. | ||||||||||||
| For GPFM, GPCM, and GPSM models, heating model size is indicated by the numbers in the 8th, 9th, and 10th characters in the model number. | ||||||||||||
| For PGAA, PGAD, PGCA, and PGCD models, heating model size is indicated by the letter in the 7th character in the model number. | ||||||||||||
| For PGMD and PGME models, heating model size is indicated by the letter in the 7th character in the model number. |
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| 462 06 1211 00 |
3/17/06 |
