We have a Raypak 8450 heat pump that has been working fine to heat the pool but last night it mysteriously came on at 7pm (pool pump is timed to go off at 6pm) and it had been valved off all day and not used. It was not blowing cold air out the top so it actually wasn't heating but it was running. I talked to a Raypak tech this morning but he wasn't much help. My normal setting is 85* and the lcd screen said the water temp was 90*. Any thoughts????
Raypak 8450 comes on when there is no flow
- Thread starter donmorrisey
- Start date
- Jul 21, 2013
- 54,642
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Welcome to TFP.
Your heater uses a pressure switch not a flow switch.
I suspect when you “valved off” the heater you trapped pressure in the pipe keeping the pressure switch engaged.
Turn off your pump and give your system time to drop pressure before closing the valves.
Install a Heater Flow Switch - Further Reading
Your heater uses a pressure switch not a flow switch.
I suspect when you “valved off” the heater you trapped pressure in the pipe keeping the pressure switch engaged.
Turn off your pump and give your system time to drop pressure before closing the valves.
Install a Heater Flow Switch - Further Reading
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