Jandy/Zodiac R0493100 Gas Valve, Natural.This valve consists of two separateinternal operating valves. The main valve suppliesgas to the main burners for heater operation. The pilotvalve supplies gas to the pilot when the pilot generatoractivates the pilot coil.If the pilot will not stay lit, look at the manual section of parts4heating and check for thefollowing:• Pilot generator output• Correct type of gas supplied• Correct gas supply pressure• Air in the gas line• Pilot coil wire connections clean and tightIf the pilot will not stay lit after checking theitems listed above, the pilot coil may be causing thefault. Replace the gas valve

Zodiac, Jandy Natural Gas Valve / Regulator for the Legacy pool heater.The gas valve controlsgas flow into the manifold. It provides flow onlywhen the temperature controls require heat andonly if all safety controls enable operation. It isalso a positive pressure regulator. It regulatesthe gas pressure in the manifold to specificationsaddressed in Technical Specs. This is necessaryfor proper operation of the burner system.

3/4" x 3/4" Milivolt 500-750MV. Check the gas supply to be sure that it is thesame as the gas indicated on the heater’s ratingplate. Legacy heaters, as shipped from thefactory, are certified to operate within the altituderange indicated on the rating plate. If a fieldconversion to a different altitude range should benecessary, manifold kits are available for changingthe altitude range of the heater. See Table 1in section 1.7.1 of this manual to determine thecorrect altitude designation for your heater. Referto Section 11 “Parts List” to order the correctpart number of the manifold kit needed. Whenchanging the altitude range of the heater, be sureto fi ll out the altitude conversion label, includedin the kit. Apply the label next to the originalrating plate