Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: High pressure when solar heater is on

  1. Back To Top    #1

    Join Date
    Apr 2017
    Location
    Murrieta
    Posts
    24

    High pressure when solar heater is on

    Hi all,

    We just bought a house with a pool and we are trying to learn how to care for it. I just cleaned the filter cartridges, and the pressure is about 15 psi. When I turn on the solar heater, the pressure jumps to about 30 psi. Solar panels are on the roof of a 2 story home. Is this normal or expected? Will it cause any issues? If this isn't normal, any thoughts on what the cause could be?

    Thanks!
    18,000 gal, fiberglass, IG saltwater pool.
    1.5 hp single speed champion pool pump, Pentair intellichlor swg, Waterway plastics cartridge filter, Solar heater, Kreepy krawly sand shark vacuum, waterfall and jets as optional features, Fiber optic light
    Murrieta, California

  2. Back To Top    #2
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,984

    Re: High pressure when solar heater is on

    Normally, a well designed solar heating system should has psi rise of 5 or less so 15 is quite excessive. Can you give us some more details:

    Pump make and model

    Size and number of panels

    Plumbing size and distance to panels

    Does the pressure gauge go to zero when the pump is off?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  3. Back To Top    #3

    Join Date
    Apr 2017
    Location
    Murrieta
    Posts
    24

    Re: High pressure when solar heater is on

    First choice 56 frame champion pool pump.

    Waterway pump motor

    No clue how big or how many panels. They are 25 feet off the ground.

    Probably 50 to 100 feet from pump to panels

    2 inch pipe

    Guage goes to zero when off

    - - - Updated - - -

    Looking at Google earth, there are 8 panels, 5 large, 3 small.
    18,000 gal, fiberglass, IG saltwater pool.
    1.5 hp single speed champion pool pump, Pentair intellichlor swg, Waterway plastics cartridge filter, Solar heater, Kreepy krawly sand shark vacuum, waterfall and jets as optional features, Fiber optic light
    Murrieta, California

  4. Back To Top    #4

    Join Date
    Apr 2017
    Location
    Murrieta
    Posts
    24

    Re: High pressure when solar heater is on

    Good morning everyone. Anyone have any other thoughts? is it safe to leave the heater on with that much pressure?
    18,000 gal, fiberglass, IG saltwater pool.
    1.5 hp single speed champion pool pump, Pentair intellichlor swg, Waterway plastics cartridge filter, Solar heater, Kreepy krawly sand shark vacuum, waterfall and jets as optional features, Fiber optic light
    Murrieta, California

  5. Back To Top    #5
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,984

    Re: High pressure when solar heater is on

    Assuming the panels are plumbed in parallel, there should not be a 15 PSI rise with solar so I would start investigating the cause of the pressure rise. My first instinct is to look at the check valve on the return side of the plumbing. If you have one, and most systems do, and if it is serviceable (i.e. the cover comes off) make sure the flapper has not come loose. If you have a older style check valve, it may be difficult to inspect it. Can you take some pictures of the pad equipment and the plumbing going to and from solar?

    Also, what is the pump motor HP and SF ratings?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  6. Back To Top    #6

    In the Industry
    Pool Clown's Avatar
    Join Date
    Sep 2008
    Location
    Silicon Valley, CA
    Posts
    1,764

    Re: High pressure when solar heater is on

    Also, panel(s) could be obstructed due to either debris that got past the filter, or if the panels had many leaks (over time). One way to repair a leak is to abandon the capillary tube in question. If you get enough of them, it will begin to affect flow.

    Two stories, and 100 feet does put extra head on the pump.
    Factory Warranty Station for:
    Jandy/Zodiac, Pentair, Sta-Rite, Raypak (Rheem, Rudd), Polaris,
    and Paramount pool cleaning systems.

  7. Back To Top    #7
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,984

    Re: High pressure when solar heater is on

    Once primed, the two story lift is no longer an issue. There is both static head loss on the lift and static head gain on the drop so the only head remaining is that due to dynamic head in the plumbing.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  8. Back To Top    #8

    Join Date
    Apr 2017
    Location
    Murrieta
    Posts
    24

    Re: High pressure when solar heater is on

    Quote Originally Posted by mas985 View Post
    Assuming the panels are plumbed in parallel, there should not be a 15 PSI rise with solar so I would start investigating the cause of the pressure rise. My first instinct is to look at the check valve on the return side of the plumbing. If you have one, and most systems do, and if it is serviceable (i.e. the cover comes off) make sure the flapper has not come loose. If you have a older style check valve, it may be difficult to inspect it. Can you take some pictures of the pad equipment and the plumbing going to and from solar?

    Also, what is the pump motor HP and SF ratings?
    Sorry, I'm new to all this, so it's Greek to me. What is a check valve? How do I know what side is the return side? I'll try to post a picture soon, but the plumbing is a huge cluster of pipes, so I don't know what to take pictures of since I don't know what they do. The solar goes underground, to the house, then 2 pipes up to the roof. There are 2 panels near where it went up, then 6 panels I think on the other side of the house.
    18,000 gal, fiberglass, IG saltwater pool.
    1.5 hp single speed champion pool pump, Pentair intellichlor swg, Waterway plastics cartridge filter, Solar heater, Kreepy krawly sand shark vacuum, waterfall and jets as optional features, Fiber optic light
    Murrieta, California

  9. Back To Top    #9

    Join Date
    Apr 2017
    Location
    Murrieta
    Posts
    24

    Re: High pressure when solar heater is on

    Quote Originally Posted by Pool Clown View Post
    Also, panel(s) could be obstructed due to either debris that got past the filter, or if the panels had many leaks (over time). One way to repair a leak is to abandon the capillary tube in question. If you get enough of them, it will begin to affect flow.

    Two stories, and 100 feet does put extra head on the pump.
    How would I clear debris from the panels? I had the solar company that installed it out to dewinterize the panels last month and they didn't mention any prior repairs or issues with pressure. I don't know, I'm lost.
    18,000 gal, fiberglass, IG saltwater pool.
    1.5 hp single speed champion pool pump, Pentair intellichlor swg, Waterway plastics cartridge filter, Solar heater, Kreepy krawly sand shark vacuum, waterfall and jets as optional features, Fiber optic light
    Murrieta, California

  10. Back To Top    #10
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,984

    Re: High pressure when solar heater is on

    Quote Originally Posted by Dwiessner View Post
    Sorry, I'm new to all this, so it's Greek to me. What is a check valve? How do I know what side is the return side? I'll try to post a picture soon, but the plumbing is a huge cluster of pipes, so I don't know what to take pictures of since I don't know what they do. The solar goes underground, to the house, then 2 pipes up to the roof. There are 2 panels near where it went up, then 6 panels I think on the other side of the house.
    A check valve will look like one of the following:

    pool check valve - Google Search

    The supply side of solar is closest to the pump pipe wise. Meaning water travels from the pump to the filter to solar supply and returns after going through the panels.

    How would I clear debris from the panels?
    Not easy to do so let's hope that there is not any panel blockage. That can only happen if debris bypasses the filter. What kind of filter do you have (sand, DE or cartridge)?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •