Bryant 580J*04--12 appendix Burner Ignition, Check Unit Operation and Make Necessary Adjust- ments

6.Reinstall burners on rack in the same locations as factory-installed. (The outside crossover flame re- gions of the outermost burners are pinched off to pre- vent excessive gas flow from the side of the burner assembly. If the pinched crossovers are installed between two burners, the flame will not ignite prop- erly.)

580J				C06153
		Fig. 33 - Burner Tray Details
	RACEWAY		INTEGRATED GAS UNIT
			CONTROLLER (IGC)

HOLE IN END PANEL (HIDDEN)

C08454

Fig. 34 - Unit Control Box/IGC Location

7.Reinstall burner rack as described in Removal and Replacement of Gas Train section, above.

Gas Valve — All three-phase models (except Low NOx) are equipped with 2-stage gas valves. Single-phase models and all Low NOx models are equipped with single-stage gas valves. See Fig. 37 for locations of adjustment screws and features on the gas valves.

To adjust gas valve pressure settings:

IMPORTANT: Leak check all gas connections including the main service connection, gas valve, gas spuds, and manifold pipe plug. All leaks must be repaired before firing unit.

Check Unit Operation and Make Necessary Adjust- ments

NOTE: Gas supply pressure at gas valve inlet must be within specified ranges for fuel type and unit size. See Tables 4 and 5.

1.Remove manifold pressure tap plug from manifold and connect pressure gauge or manometer. (See Fig. 33)

2.Turn on electrical supply.

3.Turn on unit main gas valve.

4.Set room thermostat to call for heat. If unit has two- stage gas valve, verify high-stage heat operation be- fore attempting to adjust manifold pressure.

5.When main burners ignite, check all fittings, mani- fold, and orifices for leaks.

6.Adjust high-stage pressure to specified setting by turning the plastic adjustment screw clockwise to in- crease pressure, counter-clockwise to decrease pres- sure.

7.For Two-Stage Gas Valves set room thermostat to call for low-stage heat. Adjust low-stage pressure to specified setting.

8.Replace regulator cover screw(s) when finished.

9.With burner access panel removed, observe unit heat- ing operation in both high stage and low stage opera- tion if so equipped. Observe burner flames to see if they are blue in appearance, and that the flames are approximately the same for each burner.

10.Turn off unit, remove pressure manometer and re- place the 1/8 in. pipe fitting on the gas manifold. See Fig. 33.

Limit Switch

Remove blower access panel. Limit switch is located on the fan deck. See Fig. 28.

Burner Ignition

Unit is equipped with a direct spark ignition 100% lockout system. Integrated Gas Unit Controller (IGC) is located in the control box. See Fig. 34. The IGC contains a self-diagnostic LED (light-emitting diode). A single LED (see Fig. 38) on the IGC provides a visual display of operational or sequential problems when the power supply is uninterrupted. When a break in power occurs, the IGC will be reset (resulting in a loss of fault history) and the indoor (evaporator) fan ON/OFF times will be reset. The LED error code can be observed through the viewport. During servicing refer to the label on the control box cover or Table 8 for an explanation of LED error code descriptions.

If lockout occurs, unit may be reset by interrupting power supply to unit for at least 5 seconds.

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