Spa Blowers Overheating

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kylepoolstylin

kylepoolstylin

In The Industry
Apr 25, 2024
16
CT
We were brought in to help with an existing pool/spa. The spa jets and air work independently when turned on individually. The jets and air work when turned on together if no jet bodies are in. When jet bodies are in, and we attempt to turn jets and air on together, the blowers idle up when the pump kicks on, and eventually overheat and the thermal sensor shuts them off. We’ve tried every type of jet body. We cut open the Hartford loops (above water level) and put air through the lines both ways. Homeowners say in the past everything worked perfectly. At one point, maybe two or three seasons ago, jet bodies were installed backwards by another company. They flipped them and the spa worked for another season. The following season the spa did not work upon opening and hasn’t worked since. If anyone has any thoughts or ideas I’m curious, because we are stumped. The boss has been doing this for 30+ years and says this is a strange anomaly and we’ve given away quite a bit of diagnostic time.
 

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How has the pumps or pump speeds changed during the time?

Spa blowers overheat because the pump water pressure is greater then what the air pressure can over power.

Lower the pump RPM to where the spa air pressure and pump water pressure are in balance and the air/water mix works.

This has become more of a problem as SS pumps have been replaced by high HP VS pumps that can create higher water pressure then before.
 
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Talked to the boss about this suggestion. He said he has tried lowering the pump RPM. Said he’s contacted everyone he knows in the pool industry and has tried everything everyone has suggested. It’s driving him crazy and he really wants to fix it but he’s racked his mind about it and nothing has worked.
 
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I sort of don't believe the boss.

The air blower runs with now ater flow.

Start the pump at 600 - 1000 RPM. Does the pump still run?

Up the RPM by 100 RPM every few minutes.

See around what RPM the blower shuts down.

Then work down from that RPM until you find the pump RPM the blower likes.
 
What you’re saying makes sense to me but it’s hard to say because I’m just a rookie and I trust that he’s trying as hard as possible. I wonder how low they have tried the pump RPM and I’d be curious to see. Is there a certain point to which the RPM would be so low that the pressure is no longer effective towards the purposes of a massaging and bubbly spa?
 
kylepoolstylin said:
Is there a certain point to which the RPM would be so low that the pressure is no longer effective towards the purposes of a massaging and bubbly spa?
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Sure. Every system is different. Only by experimentation will you learn what that spa can do.
 
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ajw22 said:
Sure. Every system is different. Only by experimentation will you learn what that spa can do.
Click to expand...
Also - the equipment is about 60’ away and about 10’ below the spa. The HL is about another 30’ away north of the spa, so maybe 90’ from equipment. Again, an untrained opinion, and I’m unsure on the specifications of the exact blowers, but I thought this might be quite a long run for these two to muscle?
 

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Hartford Loop is supposed to be as close as possible to the spa. It is usually built into a spa wall. 30’ away makes it pretty ineffective and is a heavy water column for a blower to clear.

@AQUA~HOLICS any ideas on this?
 
Not exactly sure, maybe 5-8 years or so based on the condition of the house and pool. Nice place. No major remodels that we’re aware of. I asked the boss about AJW’s suggestions. Said he’s tried lowering RPM’s. I also suggested the diagnostic method of starting very low and bumping incrementally. Not sure if he’s going to try it or not, it’s not necessarily my project, although I’m following along and trying to help now. They conducted a pressure test on the lines and from the sounds of it nothing too unusual happened, but maybe a restriction wouldn’t obstruct a pressure test. Hard to say if there’s a restriction, and even if there was, how to go about getting it out?
 
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