Owner`s manual

Hydro-Hot Hydronic Heating System Shop Manual 07/03
R
Page 52
Fuel
Solenoid
8.7 Fuel Solenoid
Function: The Fuel Solenoid allows the flow of diesel fuel to the Diesel-
Burner's Fuel Nozzle.
NOTE: In order to perform the following procedures it is necessary to
detach and reattach the Diesel-Burner Head. Be sure to review Section
8.2, Page 42 for detaching and reattaching instructions.
Component Test: Locate and detach the C-Plug Harness' Violet (+) and
Brown (-) wires from the Fuel Solenoid. Connect the (-) lead of a 12 volt
DC power supply to the Fuel Solenoid's (-) Electrical Terminal, reference
Figure 18. Now, intermittently apply the (+) lead of the power supply to the
Fuel Solenoid's (+) Electrical Terminal and listen for the Fuel Solenoid to
click (i.e. open and close). If the Fuel Solenoid does not click, it must be
replaced, reference the Fuel Solenoid's "Replacement Procedure" below.
Reference Section 10 for spare parts information.
Cleaning Tips / Maintenance: N/A
Adjustment Procedure: N/A
Replacement Procedure:
1. Disconnect the Ignition Cables from the Ignition Electrodes and
loosen
the Retaining Clamp Bolt, reference Figure 16.
2. Remove the Retaining Clip that secures the Photo Disc in place.
Gently lift the Photo Disc (with Flame Sensor attached) so that it
releases from the Nozzle Stand and the Ignition Electrodes, refer-
ence Figures 16 and 19.
3. Disconnect the C-Plug Harness' Violet (+) and Brown (-) wires from
the Fuel Solenoid, reference Figure 18.
4. Remove the four Nozzle Stand Plate Screws that secure the Nozzle
Stand Plate in place, reference Figure 19. Remove the Nozzle
Stand Plate by pulling on the Nozzle Stand until the plate releases
from the cast-aluminum Blower Casing, reference Figures 13 and
19.
5. Remove the Lock Nut and Flat Washer from the end of the Fuel
Solenoid Shaft and then remove the Fuel Solenoid. With the
appropriate wrench, remove the Fuel Solenoid Shaft from the
Nozzle Stand. Discard the shaft and valve kit, as replacements are
provided with the new Fuel Solenoid Assembly.
6. Insert the contents of the new Fuel Solenoid Valve Kit into the new
Fuel Solenoid Shaft, as illustrated in Figure 18. Thread the new Fuel
Solenoid Shaft to the Fuel Nozzle Stand and tighten. Slide the new
Fuel Solenoid onto the Fuel Solenoid Shaft and secure in place with
the new Flat Washer and Lock Nut.
7. Fit the Nozzle Stand Plate inside the cast-aluminum Blower Casing
and secure in place with the four Nozzle Stand Plate Screws.
Section 8: Diesel-Burner Service, Maintenance, and Repair Information