HI All,
This is a water bath heater (Indirect fired heater). Natural gas has been used as fuel. Having problem with the burner system. The heater has two main burners and two pilot burners (see the attached figures). In a chamber there is a partition and in each section there is one pilot burner with one main burner. Air suction happens naturally from the bottom of the chamber. Usually both burners works nicely but in separate time. Pilot burner starts burning firstly, then the main burner. The problem is when main burner is ON, pilot burner become OFF. It's recommended to keep the pilot burner ON always. In addition, the required voltage to keep the main burner's solenoid ON went down, when the main burner is ON. The voltage measured from the pilot burner ignition.
Is there any standard distance between pilot burner and main burner or how much the distance? As if the burners are very closer, oxygen deficiency may happen and the smaller ignition source may be stopped.