Danfoss KP, KP 1, KP 2, KP 5, KP 6 Data sheet

Data Sheet

Pressure switch
Type KP

KP pressure switchs are for use in refrigeration
and air conditioning systems to give protection
against excessively low suction pressure or
excessively high discharge pressure.

KP pressure switches are also used for starting
and stopping refrigeration compressors and
fans on air-cooled condensers.

A KP pressure switch can be connected directly
to a single-phase AC motor of up to approx. 2
kW or installed in the control circuit of DC
motors and large AC motors.

KP pressure switches are tted with a single­pole double-throw (SPDT) switch. The position
of the switch is determined by the pressure
switch setting and the pressure at the
connector. KP pressure switches are available in
IP30, IP44 and IP55 enclosures.

Features:

• Ultra-short bounce time thanks to snap­action function (reduces wear to a minimum
and increases reliability)

• Manual trip function (electrical contact
function can be tested without the use of
tools)

• Types KP 6, KP 7 and KP 17 with fail-safe
double bellows element

• Vibration and shock resistant

• Compact design

• Fully welded bellows element

• High reliability both electrically
and mechanically

AI213186439478en-001201

Features

Values

Ambient temperature

-40 – 65 °C (80 °C for max. 2 hours)

Ambient temperature (PED approved units)

-25 – 65 °C (80 °C for max. 2 hours)

Media temperature

(1)

-50 – 100 °C

Max. working pressure

LP: PS / MWP = 17 bar

HP: PS / MWP = 35 bar

KP 6: PS / MWP = 46.5 bar

Max. test pressure

LP: Pe = 20 bar

HP: Pe = 35 bar

KP 6: Pe = 46.5 bar

Contact load
Alternating current

AC1 =16 A, 400 V

AC3 = 16 A, 400 V

AC15 = 10 A, 400 V

Direct current

DC13 = 12 W, 220 V control current

Wire dimensions

solid / stranded

0.75 – 2.5 mm

2

exible, without ferrules

0.7 – 2.5 mm

2

exible, with ferrules

0.5 – 1.5 mm

2

Tightening torque

max. 2 Nm

Rated impulse voltage

4 kV

Pollution degree

3

Short circuit protection, fuse

16 A

Insulation

400 V

Enclosure

IP30 / IP44 / IP55

Pressure switch, Type KP

Product specication

Technical data

Table 1: Technical data

(1)

(1)

The media temperature can be out of ambient temperature range under necessary condition that temperature inside KP must be kept in

The media temperature can be out of ambient temperature range under necessary condition that temperature inside KP must be kept in
ambient temperature range.

ambient temperature range.

Cable connection

The cable entry can be used for 6 – 14 mm dia. cables. A Pg 13.5 screwed cable entry can also be used for 6 – 14 mm
cable.With 8 – 16 mm cable a standard Pg 16 screwed cable entry can be used.

Enclosure

IP30 to EN 60529 / IEC 60529
Enclosure IP30 is obtained when the units without top cover are mounted on a at surface or bracket. The bracket
must be xed to the unit so that all unused holes are covered.

IP44 to EN 60529 / IEC 60529
Enclosure IP44 is obtained when the units with top cover are mounted on a at surface or bracket. The bracket must
be xed to the unit so that all unused holes are covered.

KP pressure switches with auto reset are supplied with top cover. For KP pressure switches with manual reset, the
top cover must be separately ordered (code no. 060-109766 for single pressure switches and code no.
060-109866 for dual pressure switches).

IP55 to EN 60529 / IEC 60529
IP55 is obtained when the KP pressure switches are mounted in an IP55 enclosure, (code no. 060-033066 for single
pressure switches and code no. 060-035066 for dual pressure switches). IP55 enclosure has to be ordered
separately.

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Low pressure (LP)

High pressure (HP)

Dual pressure (LP/HP)

Dual pressure (LP/HP)

Dual pressure (HP/HP)

Type

Material

KP 1, KP 2, KP 5, KP 6, KP 7, KP 15 and KP 17
Tinbronze, no. CW452K, EN 1652

Nickel plated free cutting steel, no. 1.0737 / 1.0718, EN 10277

KP 1A, KP 5A, KP 6A, KP 7A and KP 15A only

Stainless steel 18/8, no. 1.4306, EN 10088-2

Free cutting steel, no. 1.0737, EN 10277

Cold forming steel, no. 1.0338, EN 10139

Steel, no 1.0308, EN 10305

Free cutting steel, no. 1.0715, EN10277

Free cutting steel, no. 1.0718, EN 10277

Aluminium, no. AW-3005, EN 573

Pressure switch, Type KP

Contact systems

Table 2: Low and high pressure

Table 3: Dual pressure

Materials in contact with the medium

Table 4: Materials in contact with the medium

Terminology

Reset

1.

Manual (Min. / Max.) reset:

Units with manual reset can only be reset during operation by activation of the reset button.

2.

Automatic reset:

After operational stop, these units reset automatically.

3.

Convertible reset:

Units with optional reset can be activated by automatic and/or manual reset

Permissible working pressure

The permissible working pressure is determined by the pressure that can be safely allowed in the refrigerating
system or any of the units within it.

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.

© Danfoss | Climate Solutions | 2021.10 AI213186439478en-001201 | 3

Pressure switch, type KP

KP 1, KP 2, KP 5

KP 15

Capillary tube for KP 1A, KP 5A and KP 15A

MK

Pressure switch, Type KP

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 ∼ 0.7 bar.Set the LP dierential on the "DIFF" scale. One rotation of the
dierential spindle ∼ 0.15 bar.The LP stop pressure is the LP start pressure minus the dierential.

 NOTE:

The LP stop pressure must be above absolute vacuum (Pe = -1 bar)!

If with low stop pressure the refrigeration compressor will not stop, check to ensure that the dierential value has
not been set too high!

Pressure switches with automatic reset – HP: Set the HP pressure on the “CUT-OUT” scale. One rotation of the HP
spindle ∼ 2.3 bar. Set the HP dierential on the “DIFF” scale. One rotation of the dierential spindle ∼ 0.3 bar. The
HP start pressure is the HP stop pressure minus the dierential.

Start and stop pressures for both the LP and HP sides of the system should always be checked with an accurate
pressure gauge.

Pressure switches with manual reset Set the stop pressure on “CUT-OUT” scale (range scale).

Low pressure switches can be manually reset when the pressure is equal to the stop pressure plus the dierential.
High pressure switches can be manually reset when the pressure is equal to the stop pressure minus the dierential.

Design

Table 5: Design

© Danfoss | Climate Solutions | 2021.10 AI213186439478en-001201 | 4