Nordyne M1M, M1G, M1B, M1S Hook-Up Procedure See Figure, How to Eliminate Air Leaks, Fuel Oil Type

ground. Fuel tanks may also be buried if prop- erly coated to resist corrosion. For below ground fuel tank installations, the vertical dimension from the bottom of the fuel tank to the fuel pump must not exceed ten feet. Keep the tank filled, especially in the summer to reduce the accu- mulation of condensation.

Fuel Line Hook-Up: One Line System The one line system is highly recommended where vertical lift, from bottom of tank to pump, is not more than eight feet. A single line hookup has the advantage of costing less and giving quieter operation.

Fuel Line Hook-Up: Two Line System Use a two line system only if the vertical lift exceeds 8 feet.

1.Install the oil feed line as outlined in steps 1- 6 below.

2.Install the oil pump bypass plug in the bottom return port.

3.Run the return line up through the furnace base to the return port of the pump. Run the other end of the line to the tank, using 3/8” O.D. copper tubing or 1/4” pipe with the ends capped, and routing the line so it stays clean.

4.Insert the return line through the second opening in the duplex bushing. If the bottom of the tank is lower than the pump intake, the tube should be inserted three or four inches from the tank bottom. If the bottom of the tank is higher than the pump intake, the return line should extend not more than 8” inside the tank.

If a two pipe system is used or if oil is taken from the bottom of the tank, a filter is recommended.

Hook-Up Procedure (See Figure 27)

1.Use a 3/8” O.D. copper tubing for the fuel line. Cap the end with tape to keep out dirt while the line is being routed.

2.Install duplex bushing for two 3/8” lines in the top fitting of the tank.

3.Insert one end of the tubing through the duplex bushing until it is three to five inches from the bottom drain. Tighten the bushing.

4.Run the line where it will not be subject to damage. Also, make bends gradually and avoid kinks which might restrict oil flow.

5.Open the furnace door. Connect the oil line to the intake port on the pump. Tighten other port plugs on the pump.

6.Be sure oil line is airtight! Air leaks can cause the pump to lose prime and will create other

problems such as nozzle failure, odors, rum- bling noise, and false safety shutdown.

7.Insert the short length of the copper tube level with the bottom of the duplex bushing. Form the tube into an inverted “U” to serve as a vent.

How to Eliminate Air Leaks

To eliminate problems caused by air in the oil line, all connections in the oil supply line and all plugs, nuts, and fittings on the pump must be airtight. This includes the nut that covers the pressure adjustment. It is important that the hook-up be done carefully and with a good flaring tool.

To assure continuous operation, use a wire to jump terminals T-T (or F-F) on the primary control while burner is running. If furnace is equipped with the Honeywell R7184 primary control, priming oil pump procedure is as fol- lows:

1.While the ignition is on, press, for 1/2 second or less, and release the reset button. The lockout time will be extended to 4 minutes.

2.If prime is not established within the 4 min- utes, the control will lock out. Press the reset button to reset the control.

3.Repeat steps “1” and “2”, if needed, until the pump is fully primed.

When oil flow is clear and free of air bubbles, close air-bleed valve and tighten. (Time to bleed air out will vary depending on length of oil line, number of bends, etc.)

Fuel Oil Type

Do not use fuel oil heavier than Grade No. 2. Grade No. 1 may be used where the oil supply is subject to low temperatures.

DO NOT USE GASOLINE, CRANKCASE OIL, OR ANY OIL CONTAINING GASOLINE.

!WARNING:

Failure to keep supply of oil clean by various procedures described above may cause failure of certain compo- nents such as the fuel pump gears, check valve, shaft seal, or burner nozzle which may result in a burner fire.

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