Bristol 2 speed comps

[monkey spanners]

Hi Guys,

Got a Bristol two speed compressor to fit in place of a single speed next week, its the same duty when run on high speed.

Anyone know how these things are wired up, i believe the motors can work on either 2 or 4 poles depending on how its connected.

Cheers Jon :)

[Grizzly]

Jon.
Are you sure you don't mean Dual Voltage?
Series A + BG series?
Basically they are wired as stand alone or in tandem.
I will email some details.
Grizzly

[chemi-cool]

Hi Jon,

here is some material that might come in handy.

http://www.bristolcompressors.com/Docs/Application%20Bulletin%20116.pdf
http://www.bristolcompressors.com/Docs/200024.pdf

[monkey spanners]

Cheers Guys! Looks like i have to link the low speed terminals together, and just power the high speed ones off the three phases.

I've got a delay timer i shall fit too as i think the old one died due to cycling on the lp as its got a leak on the condenser.

Jon :)

[Grizzly]

Hi Jon.
The attached should help?
Bristol do indeed recommend using a time delay to prevent comp short cycling.
Grizzly

[monkey spanners]

Thanks Grizzly!

I've got no excuse now not to go and fit it!

I've got a IMO timer that i think i can wire into the CCH feed so that once the comp goes off it starts counting down till it will allow a restart, or i might be able to get a feed from the lp/hp switch if its one of those dual ones with the four connections.

Cheers Jon :)