Nordyne SERIES M1B Manuel D’Utilisation

18

5. Open the furnace door and connect the oil line 

to the intake port on the pump. Tighten other 
port plugs on the pump. NOTE: Verify the oil 
line is airtight! Air leaks can cause the pump 
to lose prime and will create other problems 
such as nozzle failure, odors, rumbling noise, 
and false safety shutdown.

6. 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.

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

Prepare the burner for priming by attaching a 
clear plastic hose over the bleed port fi tting and 
fully opening the pump bleed port. Use a suitable 
container to collect purged oil.

To ensure continuous operation, use a wire to 
jump terminals T-T (or F-F) on the primary control 
while burner is running.

After the piping to the furnace is complete, all 
connections must be tested for leakage. This 
includes pipe connections at the main gas valve, 
emergency shutoff valve and each joint or union. 
The soap and water solution can be applied using 
a small paintbrush. If any bubbling is observed, 
the connection is not sealed adequately and must 
be retightened. Repeat the tightening and soap 
check process until bubbling ceases.

Priming furnaces equipped with Honeywell 
R7184 primary control:
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 minutes, 

the control will lock out. Press the reset button 
to reset the control.

3. Repeat steps 1 & 2 (if needed) until the oil 

pump is fully primed.

Priming furnaces equipped with the Beckett 
7505 primary control:
1. After the burner starts, press and hold the 

reset button until the yellow LED turns on (15 
seconds). This indicates that the button has 
been held long enough.

2. Release the reset button. The yellow LED will 

turn off and the burner will start up again.

3. At burner start up, click the reset button while 

the igniter is still on. This transitions the control 

to a dedicated pump prime mode, during 
which the motor, igniter and valve are powered 
for 4 minutes. The yellow LED will be on. 
NOTE: If prime is not established during the 
four minute pump prime mode, repeat step 3 
until the oil pump is fully primed.

4. When oil fl ow 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.

Conversion to Propane (LP) Gas
This gas fi red heating appliance was shipped from 
the factory for use with natural gas. However, the 
appliance can be converted for use with LP gas. 
Use the following procedure for gas conversion 
of the burner. See Table 

Atmospheric and Direct Ignition Furnaces
1. Follow the instructions “How to Shut Off Gas” 

on pages 21 or 22.

2. Disconnect the gas pipe union and the electrical 

wires connected to the gas valve.

3. Remove the pilot tube and thermocouple from 

the gas valve (M1G).

4. Remove the gas valve assembly:

a. Remove screw(s) from gas valve bracket. 

Gas valve and spud may be removed. 
Orifi ce is located at the end of the spud 
(M1G or M1M) or remove three (3) bolts 
from U-shaped manifold plate and orifi ce 
assembly (M1B).

5. Replace the main orifi ce with the L.P. gas 

orifi ce supplied in the envelope located by the 
gas valve. Verify the orifi ce size matches the 
nameplate or Table 10 (page 31). NOTE: It is 
not necessary to convert the pilot orifi ce.