Owner`s manual

Hydro-Hot Hydronic Heating System Shop Manual 07/03
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Section 8: Diesel-Burner Service, Maintenance, and Repair Information
Page 56
Fuel Pressure Adjustment Check:
NOTES:
A: A Fuel Pressure Gauge (reference Section 11 for special tools
information) is used to properly check the Fuel Pump's pressure
setting,
reference Figure 20. The Fuel Pump is preset to 145 psi
(the pressure required for proper fuel atomization at the Fuel
Nozzle). Perform the following procedures to check for a proper
fuel
pressure setting.
B: Be sure to use care when handling the Fuel Nozzle. Oils and/or
small dust or dirt particles from your hands may plug the nozzle's
small orifice, reference Figure 9. A partially plugged orifice will
restrict fuel flow, which will affect the combustion process of the
Diesel-Burner (i.e. excessive smoking from the exhaust pipe).
1. Remove the Fuel Nozzle (reference Figure 17) and replace it with
the Fuel Pressure Gauge, reference Figure 20.
WARNING: A spark will appear across the Ignition Electrodes (refer-
ence Figure 16) for a brief moment after the Diesel-Burner has been
activated. DO NOT attempt to make any fuel pressure adjustments until
the spark has disappeared. Failure to do so may result in serious bodily
injury (i.e. electrical shock).
2. Turn the Diesel switch ON, reference Figure 4. A pressure will
register on the Fuel Pressure Gauge once the Fuel Solenoid opens
(after approx. 10-25 seconds).
3. If the Fuel Pressure Gauge registers a 145 psi pressure reading, no
pressure adjustment is necessary. Turn the Diesel switch OFF and
wait until the motor stops running. Remove the Fuel Pressure
Gauge and reinstall the Fuel Nozzle (reference Section 8.6, Page 50
for the Fuel Nozzle's "Replacement Procedure"). Reattach the
Diesel-Burner Head.
NOTE:
If the Fuel Pressure Gauge registers below or above 145 psi,
perform the adjustment procedures listed below.
Fuel Pressure Adjustment Procedure:
1. Turn the Diesel switch ON and simply turn the Pressure Regulator
Adjustment Screw clockwise to increase fuel pressure or counter
clockwise to decrease fuel pressure, reference Figure 21.
NOTE: If
the fuel pressure will not maintain a 145 psi setting, the Fuel
Pum
p must be replaced, reference the Fuel Pump's "Replacement
Procedure" on Page 58. Also, reference Section 10 for spare parts
information.
2. Once the pressure adjustment has been made, turn the Diesel
switch OFF and wait until the motor stops running. Remove the Fuel
Pressure Gauge and reinstall the Fuel Nozzle (reference Section
8.6, Page 50 for the Fuel Nozzle's "Replacement Procedure").
Reattach the Diesel-Burner Head.
Fuel Pump,
continue
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