Owner`s manual

Hydro-Hot Hydronic Heating System Shop Manual 07/03
R
Page 50
Section 8: Diesel-Burner Service, Maintenance, and Repair Information
Function: The Fuel Nozzle is simply a fuel atomizer. It reduces the diesel
fuel
into a fine spray which is mixed with incoming combustion air and is
ignited within the Combustion Chamber.
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: Remove both Ignition Cables from the Ignition Electrodes
(reference Figure 16), or connect a jumper wire (with alligator clips) across
the metal tips of the electrodes.
WARNING: Failure to connect a jumper wire across the Ignition Elec-
trodes, or to remove the Ignition Cables from the Ignition Electrodes
(reference Figure 16), will result in a HIGH VOLTAGE shock and/or a fire.
If the Ignition Cables are removed, be sure to place a piece of electrical
tape to the end of each cable.
Remove the B-Plug from the Diesel-Burner Head's Control Unit, reference
Figure 8. Turn the Diesel switch ON (reference Figure 4) and then plug the
B-Plug back into the Control Unit to activate the Diesel-Burner. After approx.
20 seconds, the Fuel Solenoid will "click" and a fine mist of fuel should
appear
from the Fuel Nozzle in a cone shaped spray pattern. Remove the
B-Plug from the Control Unit. If the cone shaped spray pattern did not
appear, the Fuel Nozzle must be replaced, reference the Fuel Nozzle's
"Replacement Procedure" below. Reference Section 10 for spare parts
information.
Cleaning Tips / Maintenance: The Fuel Nozzle is a precision calibrated
part and cannot be cleaned or serviced. A replacement of the Fuel Nozzle
is recommended annually. Reference Section 8.1, Page 41 for maintenance
information.
Adjustment Procedure: N/A
Replacement Procedure:
1. Use a 3/4 in. wrench to hold the Fuel Nozzle Stand Hex while loosen-
ing the Fuel Nozzle with a 5/8 in. wrench, reference Figure 17.
NOTE:
Be sure to use care when handling the new Fuel Nozzle. Oils
and/or small dust or dirt particles from your hands may plug the nozzle's
small orifice. A partially plugged orifice will restrict fuel flow, which will
affect the combustion process of the Diesel-Burner (i.e. excessive
smoking).
2. When replacing the Fuel Nozzle, be sure to tighten the nozzle, loosen
it a 1/4 turn, and then firmly retighten. This will establish a seated fit
and avoid any leaks.
Fuel
Nozzle
8.6 Fuel Nozzle