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Re: My hayward c17502 is running 40 psi. is this normal?
Sounds high. Take cartridge out, put top back on and run. Check pressure. If cartridge is good, pressure should remain close to the same with or without it . If pressure drops way down replace cartridge.
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When you say it was "normal" with the engine off and the key on, do you mean normal as 40-50 psi, or normal, as 0 psi since the engine was off and there should be no oil pressure? This is important because if you are reading 40-50 psi with the engine off, it is not surprising that the gauge goes "too high" once you start the engine. If the gauge is at 40-50 psi with the engine off and the key on, then there is a problem with the gauge or the sensor. It is not an overpressure issue. As long as the engine seems to be running normally otherwise and is not clacking internally or other such things that would indicate oil pressure issues, I would feel safe using the vehicle until I could have the oil pressure circuit diagnosed and repaired.
Some thoughts.
I have a Hayward pump. The other day my gauge jumped a gear inside and suddenly my pressure went up 5 psi from 15 to 20. After I backwashed, I saw it didn't drop and opened the gauge and saw the problem.
What kind of filter do you have? If you have one with filter cloth, like DE, a torn or damaged filter cloth could cause a drop in pressure.
Is filter flow better or worse than normal?
If flow is lower, there may be something stuck in the hoses, pump suction, impellar, pump discharge or discharge hoses or even filter valve.
These are some areas to check, pretty much in order of likelyhood.
It all depends on the outside (ambient) air temperature. Your A/C low pressure switch is designed to turn the compressor off at 24 Psi. and turn it back on at 45 Psi. Most systems will normally run at between 25 and 40 Psi when the system is running on HIGH blower and "MAX" or "RECIRCULATE". A system that is fully charged may run at 25 Psi when the ambient temperature is 75 Deg. (F) and may run at 40 Psi when the ambient temperature is at 90 Deg. (F). (it can be even higher if ambient temperatures are higher than 90 Degrees.)
To properly diagnose a malfunctioning A/C system, the HIGH side pressure must also be checked. Restrictions in the system can make the low side pressure look normal while the high side pressure is high enough to blow hoses apart. (400+ Psi.)
First make sure your gauge is reading correct. Put your hand infront of the pool's return..if it feels good and strong, then the gauge could be bad. An air leak somewhere in front of the pump could also be a problem. Check all hose clamps, o'rings in any unions or valves infront of the pump could be bad or missing or the cover gasket on your pump basket could be bad
the psi range is normal and will fluctuate with the cleaniness of the filter. Depending on wether or not you have a Sand filter or an Earth Filter, you should periodically backwash(for sand) and "bump" for the earth filters. You will notice that the psi will lower back down to the lower psi range. This indicates that your water is flowing freely with little resistance.
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