I have a unit that is locking out overnight. York H5CE 090A88A. This job was passed on to me by a co worker who couldn't get back to it today. Lockouts on this unit are either high head or low suction pressure.
There is a 90 second bypass for the low pressure on startup, I don't think this is long enough. for the low temperatures.
Unit has an ICM325 fan control, not sure which sensor it's using.
on start up ambient around 25*F the compressor starts without fan running and during the first minute the head pressure rises and when temperatuer at sensor reaches 80*F fan turns on then slows down then at 65*F it shuts off shortly after that suction drops to around 15/20psi then unit shuts off.
I jusmped out low press switch on board and watched it go again and system ran and when suction dropped low it didn't stay down for long then settled at around 56-58psi, suction line was @ 44*F
I didn't spend that much time with it today but I think I'll go back and play with that fan control re check the sensor type and placement, aparently it will run all day but the lockouts have been happening at night
anyone knaow nomenclature on Texas instruments screw on pressure switches? i tried to search for it but TI website is too big hah