Pack going into standby

[fazzamouse]

got an artic circle pack with 8 copeland scroll compressors going into condenser back up even when pack is turned off then on,have tried new H.P transducer and new resistor on pack controller(R.D.M),pressures 180p.s.i high side,50 p.s.i low,guage readings match transducer readings.Have also tried swapping pack controller from pack next to it and it is not this,any thoughts?

[tony--1]

has it not got a pressure switch to put it into backup ?

all that iv seen hav !

but then again i havint seen all that they make lol

they hav a delay timer to ..maybe contacts on that that hav gone

[panda]

Is it on Asda site by any chance??

[jwhytock]

sounds like it could be the backup controllor dragging the rdm into backup thus removing the resistence
there will be a backup relay remove the 24v from it to test
just an idea p.s it is an 820 ohm resistor you have ???

[bill1983]

sounds like it could be the backup controllor dragging the rdm into backup thus removing the resistence
there will be a backup relay remove the 24v from it to test
just an idea p.s it is an 820 ohm resistor you have ???
it will be the siemens logo backup system probably with a failed transducer reading high suction pressure. you need to disconect the relay from the logo to the rdm and sort out a new transducer.

[coolhibby1875]

it will be the siemens logo backup system probably with a failed transducer reading high suction pressure. you need to disconect the relay from the logo to the rdm and sort out a new transducer.

this used to happen on m@s packs all the time!!