Recent content by cptkirk

  1. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    It looks to me that from the spec sheet for the regulator, it is undersized for this heater. Its capacity is 386 CFPH, but further down it says that its recommended to only run at 80% of capacity (which is 309 CFPH). Edit: never mind I see that for an inlet pressure of 2 PSI the capacity is 1500.
  2. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    I think its the same here. I'm pretty sure the plumbers installed everything after the meter.
  3. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    I did some more testing this morning. After attaching the manometer to the input side of the gas valve, when I first open the shutoff on the supply the pressure jumped up into the 50's, then slowly over the course of a few minutes bled down to around 23. Once it stabilized there, I did my first...
  4. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    Here are pics of the regulator and gas supply to the heater. Not a great job, but I didn't know that at the time it was done.
  5. heater_supply2.jpg

    heater_supply2.jpg

  6. regulator2.jpg

    regulator2.jpg

  7. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    Got a respite from the rain, so went out to the heater to do some more experimentation. Hooked up the manometer to the input side of the gas valve, fired up the heater and ... it fired right up. So I took the opportunity to adjust the supply regulator to its stated output while the gas was...
  8. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    After the rain, I'm getting "type 1" ignition failures again (very brief sound of weak flame, goes into IF after three trials). I've monitored input and output pressure of the gas valve (not at the same time) during these failures, and it seems like the problem is on the input side, I think with...
  9. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    Meausured the input side this morning. Pressure before the valve opens stabilizes at around 12.6" wc. When the burners are fired the steady state is around 5" wc. That's on the lower end of the range but within spec. Rain is coming soon, we'll see if it still has firing problems.
  10. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    No, it was getting late and I was losing light. But if the gas valve regulator could be adjusted to make the manifold pressure in spec, then is the upstream pressure all that important? The valve will tolerate a relatively broad range of input pressures (4.5 - 10.5" wc).
  11. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    Manometer came in late this afternoon. My manifold pressure *was* out of spec -- out of spec high (around 2.4 "wc when it should be 1.8 - 2.0), which is not what I expected. I dialed it down at the heater gas valve regulator to 2.0 and did several trials to make sure the pressure was correct...
  12. cptkirk

    Yellow algae or pollen

    Yeah, what red-beard said. Pollen is sticky. If your car is covered with pollen and you drive it around, it will still be covered in pollen. I have a sand filter and a ton of pollen in early spring, and I've never seen pollen coming out of the returns. Unless there is something really wrong with...
  13. cptkirk

    Poolsmith CO2 injection for pH control

    The welding supply shops around here only do tank exchanges. To refill, had to go to a fire safety place.
  14. cptkirk

    What's the hottest your pool gets?

    Mid 80's in the summer in the FL panhandle. Having the pool screen enclosed seems to make a significant difference.
  15. cptkirk

    Poolsmith CO2 injection for pH control

    I'm not seeing that level of stability, however my operating conditions are probably a bit different here in the FL panhandle. My system was off for around 4 days while I waited for the new pressure sensor connector to come in, and I had to add some acid to knock the pH down a bit after it...