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 specication
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.
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.
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 dierential on the "DIFF" scale. One rotation of the
dierential spindle ∼ 0.15 bar.The LP stop pressure is the LP start pressure minus the dierential.
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 dierential 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 dierential on the “DIFF” scale. One rotation of the dierential spindle ∼ 0.3 bar. The
HP start pressure is the HP stop pressure minus the dierential.
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 dierential.
High pressure switches can be manually reset when the pressure is equal to the stop pressure minus the dierential.
Types KP1, KP1A, KP2, KP6, KP6A, KP7 and KP17 units with designation W, B or S have been tested and approved by
TÜV, Rheinland in accordance with EN 12263.
Types KP6, KP6A, KP7 and KP17 have a double bellows: an outer bellows and a regulating bellows. When system
pressure exceeds the set value, the KP will automatically stop the plant. The double bellows system prevents loss of
charge in the event of bellows rupture.
A rupture in the inner bellows will cause the control cut-out pressure to fall about 3 times less the set value, thus the
refrigeration plant compressor will stop.
A rupture in the outer bellows will cause the control cut-out pressure to fall to about 3 bar under the set value, thus
providing a fail-safe function.
Versions with designation W or AW cut in again automatically when the pressure has fallen to the set value minus
the dierential.
Versions with designation B or AB can be cut in manually with the external reset button when the pressure in KP1
has increased 0.7 bar above set value and in KP6 and KP7 has fallen 4 bar under the set value.
Versions with designation S or AS can be cut in manually with the internal reset arm when the pressure has fallen 4
bar under the set value.
All KP pressure switches, including those which are PED-approved, operate independently of changes in the
ambient temperature around the control housing. Therefore the set cut-out pressure and dierential are held
constant provided the permissible ambient temperatures are not exceeded.
For complete list of approved refrigerants, visit www.products.danfoss.com and search for individual code numbers,
where refrigerants are listed as part of technical data.
For complete list of approved refrigerants, visit www.products.danfoss.com and search for individual code numbers,
where refrigerants are listed as part of technical data.
Pressure switches PED 2014/68/EU approved; EN 12263
For complete list of approved refrigerants, visit www.products.danfoss.com and search for individual code numbers,
where refrigerants are listed as part of technical data.
W = PSH (pressure switch), B = PZH (pressure switch with ext. reset), S = PZHH (pressure switch with int. reset)
W = PSH (pressure switch), B = PZH (pressure switch with ext. reset), S = PZHH (pressure switch with int. reset)
(2)
(2)
Available in Asia market with code 060-xxxx91
Available in Asia market with code 060-xxxx91
(3)
(3)
Enclosure IP44
Enclosure IP44
(4)
(4)
Factory setting: LP side: Range 1 bar Pe,
Factory setting: LP side: Range 1 bar Pe,
(5)
(5)
Conv.: optional automatic or manual reset
Conv.: optional automatic or manual reset
Di. 1 bar; HP side: Range 18 bar Pe, Di. 4 bar xed
Di. 1 bar; HP side: Range 18 bar Pe, Di. 4 bar xed
For complete list of approved refrigerants, visit www.products.danfoss.com and search for individual code numbers,
where refrigerants are listed as part of technical data.
Use with A2L refrigerants (R455A, R454C, R1234yf, R1234yz, R1234ze)
CAUTION:
While using A2L refrigerants the following safety requirements should be followed
Safety requirements
1.
KP pressure switches shall only be employed in the units/systems which comply with the requirements for
charge limits and requirements for avoiding ignition sources of IEC 60335-2-24, IEC 60335-2-40, IEC 60335-2-89,
ISO 5149, EN378-1 or equivalent
2.
Applying the overload on the KPs must be prevented. If by any chance it was damaged, the system / unit shall be
stopped and KP shall be replaced as necessary
3.
Electrostatic discharge protection and Electrical leakage protection shall be surely implemented by grounding or
other measures
4.
Only trained personnel are authorized to handle ammable refrigerants systems and may do the installation,
maintenance and exchange of the switch by using appropriate tools
5.
It is recommended to regularly check the function of KP switch
6.
The KP pressure switches shall be used as built-in devices that cannot be accessible from outside and protected
against mechanical impact
7.
The KPs shall be installed in water free environment. In addition, protection of the KP switches against corrosion
shall be taken into consideration when using them in corrosive environment
8.
Cables shall not be in contact with sharp edges. The cables shall be connected with adequate stress relieve in
order to prevent that pulling forces can be carried thorough the cable to the terminal
9.
In the event of pressure pulsation in the system, where switch is connected, these must be eectively dumped to
prevent failure of the bellows. The cycle frequency of KP switch shall be kept as low as possible
10.
The KP switches shall not be installed in places where high level of vibration is present
Electrical rating for use with A2L refrigerants (R455A, R454C, R1234yf, R1234yz, R1234ze)
The list contains all certicates, declarations, and approvals for this product type. Individual code number may have
some or all of these approvals, and certain local approvals may not appear on the list.
Some approvals may change over time. You can check the most current status at danfoss.com or contact your local
Danfoss representative if you have any questions.
Table 17: Certicates, declarations, and approvals
CE-marked in accordance with:
• LVD 2014/35/EU (EN 60947-1, EN 60947-4-1, EN 60947-5-1)
• PED 2014/68/EU, category IV (EN 12263): KP 1, KP 2, KP 6, KP 7 and KP 17
• Underwriters Laboratories Inc., UL listed China Compulsory Certicate, CCC
Ship approvals
Det Norske Veritas and Germanischer Lloyd, DNV GL
Registro Italiano Navale, RINA
Bureau Veritas, BV
Lloyd’s Register, LR
Russian Maritime Register of Shipping, RMRS
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