Honeywell PGF3 installation instructions Heating Input Rate Check

!

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

+-- .3 ”water column from the values in Table 2. Never exceed the required input rate (Table 3).

Table 3				Required Input Rate for All Models
				Required Input Rate of Furnace Converted to Natural Gas (Btu/hr)
	Heating Model				Elevation Above Sea Level (feet)
	Size1	0-2000	2001-3000	3001-4000	4001-5000	5001-6000	6001-7000		7001-8000	8001-9000	9001-10000
	"040" or "B"	40,000	35200	33600	32000	30400		28800	27200	25600	24000
	"060" or "C"	60,000	52800	50400	48000	45600		43200	40800	38400	36000
	"080" or "D"	80,000	70400	67200	64000	60800		57600	54400	51200	48000
	"100" or "E"	100,000	88000	84000	80000	76000		72000	68000	64000	60000
	"120" or "F"	120,000	105600	100800	96000	91200		86400	81600	76800	72000
	"140" or "G"	140,000	123200	117600	112000	106400		100800	95200	89600	84000
	1Note:
	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.
	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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