Gas Pressure Adjustment

Gas Flow (Approximate)

Table 8

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 8. If manifold pressure matches Table 9 and rate is incorrect, check gas orifices for proper size and restriction. Remove temporary gas meter if installed.

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

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.

For proper furnace operation the minimum gas supply pressure is 5" w.c and the maximum gas supply pressure is 13" w.c for natural gas. The minimum gas supply pressure is 10" w.c. and the maximum gas supply pressure is 13"

w.c. for LP/propane gas.

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 9.

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.

High Altitude Information

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

The manifold pressure may require adjustment to ensure proper operation at higher altitudes. Refer to Table 9 for proper manifold pressure settings at varying altitudes. Table 10 lists required pressure switch changes and conversion kits at varying altitudes.

The combustion air pressure switches are factory set and require no adjustment.

Manifold Pressure (Outlet) Inches w.c.

Table 9

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

Conversion Kit and Pressure Switch Requirements at Varying Altitudes

Pressure switch is factory set. No adjustment necessary. All models use the factory installed pressure switch from 0-4500 feet (0-1370 m).

Table 10

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92G1UH, 95G1UH, A95UH, A93UH specifications

Allied Air Enterprises is renowned for producing high-quality HVAC systems, and its models A93UH, 92G1UH, A95UH, and 95G1UH are no exception. These units exemplify cutting-edge technology, efficiency, and reliability, making them popular choices for residential and commercial applications.

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