Greenheck Fan 470656 manual Start-Up Furnaces all units, Start-Up Single Stage Control

Start-Up - Furnaces (all units)

important

For the unit to function properly, all stage or modulation valves must be set for high and low fire.

Note

There are five furnace control options available. Be sure to refer to the specific instructions for your control type.

important

Multi furnace units may use a combination of the available control options. Each furnace must be set- up per the specific instructions for its control type.

important

Multi furnace units will use one stage or electronic modulation controller per unit and one or two ignition controller(s) per furnace. Each furnace will have its own gas valve(s). Each valve must be set for high and low fire.

Note

To force the unit to light for set-up purposes, the heat switch must be closed or jumpered out. See the Ladder Diagram on the inside of the control center door for proper terminals to jumper out.

Note

If the unit is equipped with an independent inlet air sensor (not incorporated into the stage or modulation controller), the unit will not light unless the outside air temperature is less than the inlet air sensor setting. If the outside air is greater than the inlet air sensor setting, turn the setting to its maximum position. When set-up is complete, reset the inlet air sensor to the proper temperature. If the unit is equipped with a stage or electronic modulation controller that includes an inlet air sensor function, the inlet air sensor will be overridden when the unit is forced to high fire.

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Available Control Options
Single Furnace Units
1:1 Staged	one 1-stage furnace
2:1 Staged	one 2-stage furnace
8:1 Staged	one 8-stage furnace
2:1 Electronic	one 2:1 modulating furnace
Modulation
4:1 Electronic	one 4:1 modulating furnace
Modulation
Two Furnace Units
1:1 Staged	two independent 1-stage furnaces
2:1 Staged	two independent 1-stage furnaces
4:1 Staged	two independent 2-stage furnaces
16:1 Staged	one 8-stage and
	one 1-stage furnace
8:1 Electronic	one 4:1 modulating and
Modulation	one 2-stage furnace
Three Furnace Units
1:1 Staged	three independent 1-stage furnaces
3:1 Staged	three independent 1-stage furnaces
6:1 Staged	three independent 2-stage furnaces
24:1 Staged	one 8-stage and
	two 1-stage furnaces
12:1 Electronic	one 4:1 modulating,
	one 2-stage and
Modulation
	one 1-stage furnace

Start-Up - Single Stage Control

1. Send Unit to High Fire

Send the unit to high fire by setting the temperature selector to

its maximum setting.Temperature

Selector

2.Check the High Fire Manifold Pressure

Using a manometer, measure the burner manifold pressure at the manifold pressure test port. Refer to the Gas Train Layout in the Reference section for the test port location.

The pressure on high fire
		Single Stage Manifold
should be 3-1/2 in. wg for
		Pressure (in. wg)
natural gas and
		Natural Gas	LP
10 in. wg for
	High Fire	3-1/2	10
LP gas.
If needed, use the
high fire adjustment			High Fire
screw on the staged gas
			Adjustment
valve to adjust the high
fire manifold pressure.
Counterclockwise rotation
will decrease the gas
pressure and clockwise
rotation will increase the
gas pressure.

3. Reset the Temperature Setting

Reset the temperature setting on the temperature selector to the desired setting.

Model IG / IGX Make-Up Air 25