Nordyne M3RL Series Lighting and Adjustment of the Appliance, Convertible Pressure Regulator Cap

Reinstalling the Burner Assembly:

1.Reinstall the gas manifold assembly to the burner box with the four (4) fasteners, which were removed earlier.

2.Carefully reinstall the burner box into the unit. After installing the burner, inspect the alignment of the burners with the heat exchanger tubes. The center of the burn- ers should be aligned with the center of the tubes.

3.Reconnect the gas piping to the gas valve.

4.Reconnect the wires to the gas valve termi- nals.

5.Reconnect the rubber pressure tubes to the gas valve and the burner box. Reinstall the burner access cover plate.

6.Reconnect the ignitor at the 2 position plug.

7.Reconnect the flame sensor wire to the burner box.

Pressure Gauge Installation

NOTE: For natural gas installations, the in- coming gas line pressure at the gas valve inlet must be between 4.5” WC and 10.0” WC. For LP gas installations, the incoming gas line pres- sure at the gas valve inlet must be between 11.0” WC and 14.0” WC. This pressure can be checked at the inlet end of the gas valve using a pressure gauge or U-tube manometer, which must be installed according to the manufacturer’s supplied instructions.

LIGHTING AND ADJUSTMENT OF THE APPLIANCE

1.Turn ON the gas at the manual valve, outside of the unit.

2.Check all gas connections for leaks with a soap and water solution. If the solution bubbles there is a gas leak which must be corrected. Do NOT use an open flame to check for gas leaks.

3.Turn ON the electrical power to the appli- ance.

4.Move the gas valve lever/knob to the “ON” position. The lever/knob must be moved to the end of its range of motion to insure the valve is completely open. Use only your hand to push in or turn the gas control valve. Never use tools.

Honeywell	A	T		N	OR	L	P
	N							L
Valve		T		A			P
						OTHER SIDE
PRESSURE
						OF CAP
REGULATOR
CAP
	A	T	N
	N
		T	A

M11678

Figure 23. Convertible Pressure

Regulator Cap

Figure 24. Burner Inspection

		Burner	Gas
		Orifices
			Manifold		Flame
				Observation
					Port
			On/Off
			Lever
Burner	Inlet
Box	Pressure			Access
	Tap	Inlet		Cover
			Gas	Plate
			Valve

Figure 25. Typical Installation For Sealed

Burner Box With Access Cover Plate

5.Set the room thermostat to a point above room temperature to begin the heating cycle of the unit.

6.Check that the unit ignites and operates properly. Refer to the installation instruc- tions provided with your unit for the normal operating sequence.

23