5
Removing Blower Motor
1. Turn off power to furnace.
2. Disconnect power wires.
3. Remove two 1/2" screws.
4. Slide blower out.
5. Remove 3, 3/8" screws.
6. Remove blower and blower wheel.
7. Remove blower wheel.
8. To reinstall, reverse steps 1-7.
Testing The Oil Burner
(See Figures 6, 7 and 8)
The two manual resets should be checked before testing
any other CMF Furnace Component. These are the Primary
Control and the Burner Motor Manual reset.
Check the incoming power with a voltmeter. Set the voltme-
ter at the proper scale, a 120V ±10% should be obtained. If
not, check at power cord:
1. Shut off power to the unit.
2. Remove Electric Panel Cover 1, 5/16" screw.
3. Remove 2 wire nuts.
4. Attach voltmeter to incoming power.
5. Turn on power to the unit.
6. Read voltage 120 +/- 10%.
7. Turn off power and reverse steps 1-3.
Test Oil Pump
The fuel(s) used in the oil gun pressure burner applications
are No. 1 Fuel, and No. 2 Fuel . It is recommended to use #1
where temperatures fall below 32°.
The oil storage tank may be installed either above or below
grade. Check local or state codes. To prevent abnormal tank
pressure during fill, the vent pipe should be 1" to 1 1/4" round.
On single line systems, bleed all air out of the fuel supply
system before lighting the furnace.
Test fuel pump resistance or vacuum with a vacuum gauge.
If vacuum reads greater than 10 inches, look for kinked
tubing, a plugged oil filter, undersized line, excessive oil lift,
heavy oil or a frozen line.
Maximum Values for Vacuum Hq.
Single Stage - Single Line
(M units)
6"
Single Stage - Two Line
(M units)
10"
Two Stage
(2 M units)
15"
The second fuel pump test is to check the pump efficiency
or capacity. With the burner running, the efficiency is
satisfactory if the oil pressure can be adjusted to 140 PSI.
After checks, adjust the oil pressure for normal operation
to 100 PSI.
Figure 6
Figure 7
Figure 8