Aqua-Hot AHE-100-02S-12 VDC Service Manual Page 50

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© 2011 Aqua-Hot
®
AHE-100-02S Hydronic Heating System Service Manual—Rev. B
Diesel-Burner Motor:
The motor drives the combustion air blower and the
fuel pump. In order to perform the following proce-
dures, it may be necessary to detach the diesel-
burner head.
Component Test:
1.
Turn the diesel switch
ON
and verify both the
diesel burner switch (B1) and the diesel burner
motor (B4) have 12VDC.
2. Verify that the control thermostat is calling for heat,
which it should be when the boiler antifreeze
temperature is below 175 ºF.
3. Locate the diesel-burner controller’s C-Plug and
insert the probes of a DC voltmeter into the C-2 (+)
and the C-5 (-) locations.
If normal voltage is present inspect the C-Plug Harness
for loose or damaged wire connections. If the C-Plug
harness and connections are in good condition, but the
motor is not operating the motor must be replaced.
If there is no 12 Volts D.C. present on the C-2 pin,
The diesel burner controller will need to be replaced.
NOTE: If the B1 Terminal does not have power verify that
the E-Fuse is good, and that the diesel burner switch is send-
ing power to the diesel burner controller.
If the B4 Terminal does not have power verify that the F-
Fuse is good.
Figure 37
NOTE: Before testing the diesel burner motor it is recom-
mended to ensure that the ground post on the Aqua-Hot is
securely tightened.
NOTE: Before replacing the diesel burner controller it is
recommended to test the motor seperately to ensure that it is
not defective. It is possible for a bad motor to cause the C2
Pin to not have 12 volts D.C.
SECTION 8: DIESEL-BURNER COMPONENTS/TROUBLE SHOOTING
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