Service manual

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© January 2013 Aqua-Hot
®
600-D01 Series Hydronic Heating System Service Manual - Rev. A
APPENDIX C: FUEL PRESSURE CHECK AND ADJUSTMENT
Instructions for Checking Fuel Pressure
Step 3: Installing the fuel pressure gauge
2. Using a 5/8” and a 3/4” wrench install the fuel pressure gauge.
Figure B3
2. Turn the diesel burner switch to the on position. A pressure will register on the fuel
pressure gauge once the fuel solenoid opens (after approx. 10-20 seconds).
WARNING!
A spark will appear across the ignition electrodes 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. In some installations it may be necessary to shine a light on the flame sensor to
simulate a flame condition to shot of the ignition coil.
Figure B4