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

3/4" x 3/4" Milivolt 500-750MV. Check the gas supply to be sure that it is the same as the gas indicated on the heater’s rating plate. Legacy heaters, as shipped from the factory, are certified to operate within the altitude range indicated on the rating plate. If a field conversion to a different altitude range should be necessary, manifold kits are available for changing the altitude range of the heater. See Table 1 in section 1.7.1 of this manual to determine the correct altitude designation for your heater. Refer to Section 11 “Parts List” to order the correct part number of the manifold kit needed. When changing the altitude range of the heater, be sure to fi ll out the altitude conversion label, included in the kit. Apply the label next to the original rating plate