Algas SDI Direct Fired F6-ASME, Operation & Maintenance Manual

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Algas-SDI Operation and Maintenance Manual – P/N – 54000 25
Troubleshooting
5
1. PILOT - TROUBLESHOOTING TREES #1 & #2
 The pilot flame is adjusted at the factory to provide a non-blowing blue flame.
If the flame is not adequate or the pilot does not stay lit, check the pilot
burner to see if it is clear of any obstructions.
 Flame should envelope 3/8” to 1/2" of the thermocouple tip. If the pilot flame
is too low, the thermocouple will not generate sufficient voltage to hold the
main burner’s valve open. If the pilot flame is too small, clean the pilot
burner orifice, or replace the pilot. Each 160H pilot uses #23 pilot orifices
2. MAIN BURNER WILL NOT IGNITE - TROUBLESHOOTING TREE #3
 Check the pilot burner as per 1. above.

Check burner regulator. Disconnect tube from outlet side of regulator and
check output pressure.
 If pilot burner and burner regulator check out OK, the problem is in the
thermostat. Replace thermostat (the main burner will not come on unless the
temperature in the heat exchanger drops).
3. IF VAPOR PRESSURE DROPS - TROUBLESHOOTING TREE #4
 Check burner; check pilot as per 1. and 2. above.
 If vapor pressure drops, but main burner(s) is working, vapor demand
exceeds vaporizer capacity.
 Check liquid excess flow valve and shut off valve; make sure they are open.
 Close liquid inlet valve upstream of strainer. Bleed down system and clean
strainer filter.