How to setup KP15 Danfoss Pressure Cut-off switch ????

I have started building my first cascade so i bought a danfoss KP15 pressure cut-off switch . This model can monitor both low side & high side . But ... I'm having doubts if the low side switch is needed . I mean , i could buy the KP5 (only high side) ... Is the low side cut-off switch needed in cascades ???

The high side monitor is connected right after the compressor discharge (before the oil separator) , while the low side is connected before the compressor accumulator (after the evap) . Is this right ???

I set the high side cut-off to 350Psi , but I don't know where to set the low side cut-off .

I'll use R507A for the first stage & R1150 for the 2nd .

http://www.danfoss.com/NR/rdonlyres/.../PFC00A102.pdf

http://au.refrignet.danfoss.com/prod...-53127889CD57}

http://refrignet.asean.danfoss.com/T...CPICD0B102.pdf

You don`t have to use low side switch, high is enough :)

You can connect it just after compressor to high side and just before accumulator (if you have one) to low side, right.

there should be one more screw to regulate low side.

So i have to setup the switch according to the pressures low stage works .
Let's say we have -40C on HX ... then according to the r1150 P/T the pressure needed to condense would be about 20bar (or 290PSI) . So i just set the cut-out to 22-24bar (The KP15 has 4bar fixed differential).

Now , for the low side ... For evaporating temps around -90C pressure is 2-3bar . I set cut-out at -75C (4bar) and differential at 4 bar . So cut-in is at 0bar .

Am i right or ... ? :idea:

Good luck with your cascade my friend........

Quote:

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Originally Posted by ThorLite

Good luck with your cascade my friend........

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Thanks my friend . :)

It really makes my wonder why i got only one answer ... :confused:
There are enough people who bought this unit (Danfoss) for their cascade .

How did you set your unit ??? Or how should i setup my unit . Is my previous post right or wrong ???

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OK ... Forget it . I found it myself .