Submittal Sheet

Table Of Contents

Test pressure

The test pressure is the pressure used in strength tests and / or leakage tests on refrigerating systems or individual

parts in systems. The test pressure is designated Pe.

“Snap function”

A certain contact force is maintained until irrevocable “snap” is initiated. The time during which the contact force

approaches zero is thus limited to a very few milliseconds. Therefore contact bounce cannot occur as a result of, for

example, slight vibrations, before the cut-out point. Contact systems with “Snap function” will change over even

when micro-welds are created between the contacts during cut-in. A very high force is created during cut-out to

separate the contacts. This force immediately shears o all the welds. Thus the cut-out point of the unit remains very

accurate and completely independent of the magnitude of the current load.

Setting

Pressure switches with automatic reset – LP: Set the LP start pressure on the “CUT-IN” scale (range scale). One

rotation of the low pressure spindle ~10 psi. Set the LP dierential on the “DIFF” scale. One rotation of the

dierential spindle ~ 3 psi. The LP cut-out pressure is the LP cut-in pressure minus the dierential.

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NOTE:

The LP cut-out pressure must be above absolute vacuum pe = 30 in Hg. If compressor will not stop at low cut-out

pressure, check whether the dierential value is set at too high a value!

Metric conversions 1 psi = 0.07 bar

Pressure switches with automatic reset – HP: Set the HP cut-out pressure on the “CUT-OUT” scale. One rotation of

the HP spindle ~ 33 psi. Set the HP dierential on the “DIFF” scale.

One rotation of the dierential spindle ~ 4 psi. The HP cut-in pressure is the HP cut-out pressure minus the

dierential. Pressure switches with manual reset. Set the cut-out pressure on “CUT-OUT” scale (range scale). Low

pressure controls can be manually reset when the pressure is equal to the cut-out pressure plus the dierential.

High pressure switches can be manually reset when the pressure is equal to the cut-out pressure minus the

dierential.

Cut-in and cut-out pressures for both the LP and HP sides of the system should always be checked with an accurate

pressure gauge.

Dimensions [in] and weight [lb]

Table 5: Flare connection

KP 1, KP 2 and KP 5

Danfoss

60-760.13

KP 15 and KP 25

Danfoss

60-908.11

KP 7W and KP 7B

Danfoss

60-1014.12

KP 17W and KP 17B

Danfoss

60-1015.14

Pressure switch, Type KP