Natco Fire-Coil 175-400 Installation And Operation Instructions Manual page 18

Page 16
IGNITION SYSTEM NO. 1 - STANDING PILOT
ON/OFF OR MECHANICAL MODULATION
Volume Water Heaters (325-400) Version B
Natural or Propane Gas
PUMP INCLUDED ON PW
MODELS, FIELD SUPPLIED
ON VW MODELS
Figure 25. Typical example of wiring schematic, System 1.