GAS Meter Clocking Chart

Gas Pressure Adjustment

Gas Flow (Approximate)

		Seconds for One Revolution
Unit		Natural			LP
Unit		1 cu ft	2 cu ft		1 cu ft	2 cu ft
		Dial	Dial		Dial	DIAL

−045		80	160		200	400
−070		55	110		136	272
−090		41	82		102	204
−110		33	66		82	164
−135		27	54		68	136
	Natural−1000 btu/cu ft			LP−2500 btu/cu ft

TABLE 11

NOTE: To obtain accurate reading, shut off all other gas appliances connected to meter.

Furnace should operate at least 5 minutes before checking gas flow. Determine time in seconds for two revolutions of gas through the meter. (Two revolutions assures a more accurate time.) Divide by two and compare to time in Table 11. If manifold pressure matches Table 12 and rate is incorrect, check gas orifices for proper size and restriction. Remove temporary gas meter if installed.

Supply Pressure Measurement

A threaded plug on the inlet side of the gas valve provides access to the supply pressure tap. Remove the threaded plug, install a field-provided barbed fitting and connect a manometer to measure supply pressure. Replace the threaded plug after measurements have been taken.

Manifold Pressure Measurement

1.Remove the threaded plug from the outlet side of the gas valve and install a field provided barbed fitting. Connect to a manometer to measure manifold pressure.

2.Start unit and allow 5 minutes for unit to reach steady state.

3.While waiting for the unit to stabilize, observe the flame. Flame should be stable and should not lift from burner. Natural gas should burn blue.

4.After allowing unit to stabilize for 5 minutes, record manifold pressure and compare to value given in Table 12.

NOTE: Shut unit off and remove manometer as soon as an accurate reading has been obtained. Take care to remove barbed fitting and replace threaded plug.

Supply Line and Manifold Pressure (inches w.c.)

Unit	Fuel	Manifold	Line Pressure
Unit	Fuel	Pressure	Line Pressure
		Pressure


All	Nat. Gas	3.5	4.5 − 10.5

All	L.P. Gas	10.0	11.0 − 13.0

TABLE 12

NOTE:A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion procedure.

Proper Combustion

Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking combustion. Take combustion sample beyond the flue outlet and compare to the tables below. The maximum carbon monoxide reading should not exceed 50 ppm.

Unit	CO2% For Nat	CO2% For L.P.
All	7.2 − 7.9	8.6 − 9.3

The maximum carbon monoxide reading should not exceed 50 ppm.

TABLE 13

High Altitude Information

NOTE: In Canada, certification for installations at elevations over 4500 feet (1372 m) is the jurisdiction of local authorities.

The furnace requires no manifold pressure adjustments for operation at altitudes up to 10,000 feet (3048 m) above sea level. Units installed at altitudes of 4501 - 10,000 feet (1373 to 3048 m) require a pressure switch change which can be ordered separately. Table 14 lists conversion kit and pressure switch requirements at varying altitudes.

The combustion air pressure switch is factory-set and requires no adjustment.

Page 36 of 48

Issue 1109

506725-01

A95DF, 95G1DF, A93DF, 92G1DF specifications

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