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  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...
  16. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    Curious: if the consumption rate when it does fire is close to the heater rating, is it still possible that the pressure is low coming out of the gas valve?
  17. cptkirk

    Yellow algae or pollen

    We get a *lot* of pollen in the early spring where we live. It floats on the surface and sticks to the tile at the water line. Have never seen anything like that on the bottom of the pool.
  18. cptkirk

    Pump making odd noise

    I may not have stated it well, and I guess it could be in the impeller in this case. But my pump has a fan blade that spins when the pump is in operation. The fan has a cover with a grid opening, and sometimes stuff gets in there. On both occasions when I had strange noise problems, that's what...
  19. cptkirk

    Pump making odd noise

    On a couple of occasions my Hayward pump has made unusual noises. Both times, it turned out to be obstructions in the blower. Once it was a lizard that got caught up in there. Another time it was debris of some kind. Worth taking a look at to see if it might be the problem.
  20. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    My wife and I are currently watching a series called The Investigation on HBO Max, which is about the investigation of a notorious murder case in Demark. At one point, over dinner the lead investigator comments to his wife that every time they think they are on to something, it turns out they...
  21. cptkirk

    Quick question on igniter for Hayward 400FDN heater

    Got an email response from Hayward today, they said this is normal.
  22. cptkirk

    Gas supply line issues for pool heater

    Here are the results: All appliances except pool heater: 167 CFPH All appliances and pool heater: 545 CFPH Pool heater alone: 378 CFPH These were independent measurements, looks like the pool heater consumption is the same whether other appliance are running or not.
  23. cptkirk

    Gas supply line issues for pool heater

    What am I gaining from this test? Although I may not have stated it here, I know that the heater sometimes fails to light even when it's the only thing running.
  24. cptkirk

    Gas supply line issues for pool heater

    That's why I chose the 2 CF meter instead of the .5 CF meter. But I can run a longer test, although I don't think it's going to change the answer much.
  25. cptkirk

    Gas supply line issues for pool heater

    Just had a call with the gas company. Turns out my home is set up as a high pressure (2 psi) system as ChristopherDB guessed. So this explains why I have regulators on every branch and why I'm getting sufficient flow even though the supply lines are undersized. The gas company assured me that...
  26. cptkirk

    Gas supply line issues for pool heater

    So I "clocked" the meter this morning while the pool heater (and nothing else) was running. It took just under 20 seconds for a full revolution of the 2 CF dial, which corresponds to 360 CFPH. If we use 1000 as the rough conversion factor, that's 360,000 BTU/hr. Since the time was just under 20...
  27. cptkirk

    Gas supply line issues for pool heater

    The plumbers also used similar flex outdoors to make the final connections to the tankless water heaters (looks similar externally, I haven't looked closely at the size of it). All of this presumably passed inspection. If it wasn't allowed outdoors, wouldn't it have been flagged? I'm just...
  28. cptkirk

    Gas supply line issues for pool heater

    Sorry I don't know what this means. Can you explain please?
  29. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    I thought about this for a couple of minutes, and remembered that earlier today when I was experiencing type 1 failures, I was watching the meter and it was drawing gas for about 3.5 seconds during a failed trial. So I don't think it is shutting off gas too soon. I wasn't watching the meter...
  30. cptkirk

    Intermittent ignition failures on Hayward 400FDN heater

    So what is the theory here? The gas valve closes prematurely and snuffs the flame? How would I go about testing that? And why would it seem to be more prevalent when the conditions are damp?