Danfoss KP Thermostats Data sheet

Data Sheet

Thermostat
Type KP

The KP Thermostats are single-pole, double­throw (SPDT) temperature-operated electric
switches.

They can be connected directly to a single­phase AC motor of up to approx. 2 kW or
installed in the control circuit of DC motors and
large AC motors.

The KP Thermostats are used for regulation, but
can also be seen in safety monitoring systems.

They are available with vapour charge or with
adsorption charge. With vapour charge the
dierential is very small. The KP Thermostats
with adsorption charge are widely used to give
frost protection.

Features

• Wide regulating range

• Can be used for deep freeze, refrigeration and
air conditioning plant

• Welded bellows elements mean increased
reliability

• Small dimensions. Easy to install in
refrigerated counters or cold rooms

• Ultra-short bounce times. This gives long
operating life, reduces wear to a minimum
and increases reliability

• Standard versions with changeover switch.
Possible to obtain opposite contact function
or to connect a signal

• Electrical connection at the front of the unit.

◦ Facilitates rack mounting
◦ Saves space

• Suitable for alternating and direct current

• Cable entry of soft thermoplastic for cables
from 6 to 14 mm diameter

• Extensive and wide range

AI203586420959en-000801

KP 63

KP 68

KP 69

KP 62

KP 71

KP 73

KP 75

KP 77

KP 79

KP 81

KP 98 HT

KP 98 HT

KP 98 OILKP 98 OIL

Vapour range

Adsorption charge

KP 61

KP 62

-50 50 100 150 200°C0

Danfoss

60-1038

Thermostat, Type KP

Portfolio overview

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Features

Description

Ambient temperature

-40 – 65 °C (80 °C for max. 2 hours)

Switch

Single-pole, double-throw (SPDT) changeover switch

Contact load
Alternating current
AC1 =16 A, 400 V

AC3 = 16 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

KP temperature control

KP 98

Line

SPDT

16A

1

2

4

M

Danfoss

60-894.12

M

HTOIL

16A

A

Q

B C

Thermostat, Type KP

Product specication

Technical data

Table 1: Technical data

Cable connection

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

Enclosure IP30 to EN 60529 / IEC 529

This grade of enclosure is obtained when the unit is mounted on a at surface or bracket. The bracket must be xed
so that all unused holes are covered.

Contact systems

Table 2: Contact systems

Terminology

Dierential

The dierential is the dierence between the make and break temperatures. A dierential is necessary for
satisfactory automatic operation of the plant.

Mechanical dierential (intrinsic dierential)

The mechanical dierential is the dierential set by the dierential spindle.

Operating dierential (thermal dierential)

The operating dierential is the dierential the plant operates on. Operating dierential is the sum of the
mechanical dierential and the dierential produced by the time constant.

Reset

1. Manual reset:

Units with manual reset can only be restarted after the reset button has been activated. On min. reset units the set
value is equal to the cut-out value for falling temperature. On max. reset units the set value is equal to the cut-out
value for rising temperature.

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1

2

3

7

8

9

15

17

12

16

4

1

2

Danfoss

60-296.16

Danfoss

60-1032.10

15

12162813

7

9

13

14

Thermostat, Type KP

2. Automatic reset:

These units are automatically reset after operational stop.

Setting

Thermostats with automatic reset

Set the upper activating temperature on the range scale.

Set the dierential on the "DIFF" scale. The temperature setting on the range scale will then correspond to the
temperature at which the refrigeration compressor will be started on rising temperature. The compressor will be
stopped when the temperature has fallen in relation to the dierential setting.

Note that the dierential depends on the range setting. Therefore, the dierential scale must only be used as
guideline.

If with low stop temperature settings the compressor will not stop, check whether the dierential is set at too high a
value!

Thermostats with minimum reset

Set the stop temperature on the range scale. The dierential is a xed setting.

The compressor can be restarted by pressing the “Reset button” after the temperature on the thermostat sensor has
risen by a value equal to the xed dierential setting.

Thermostats with maximum reset

Set the stop temperature on the range scale. The dierential is a xed setting.

The compressor can be restarted by pressing the “Reset button” after the temperature on the thermostat sensor has
fallen to a value equal to the xed dierential setting.

Design and function

Figure 1: Key sketch of KP thermostat

Figure 2: KP thermostat

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Danfoss

60-904.12

17

Danfoss

60-272.12

17

Danfoss

60-1037

17

Danfoss

60-1033.10

17

Danfoss
60-370.16

OIL

17 17

Max. reset

18512161183

7

10

15 13 11

9

14

Danfoss

60-421.13

KP 98

123789121314151617Temperature setting spindle

Dierential setting spindle

Main arm

Main spring

Dierential spring

Bellows

Switch

Terminals

Earth terminal

Cable entry

Tumbler

Sensor

Thermostat, Type KP

Figure 3: Adsorption charge

Figure 4: Vapour charge

Figure 5: Adsorption charge

Figure 6: Vapour charge

The switch in the KP has a snap-action function and the bellows move only when the cut-in or cut-out value is
reached.

The design of the KP thermostats aords the following advantages:

• High contact load

• Ultra-short bounce time

• Vibration resistance up to 4 g

• In the range 0 – 1000 Hz

• Long mechanical and electrical life

Figure 7: KP thermostat, dual type

Figure 8: KP 98

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19

17

9

Danfoss
60-910.10.20

91719

Bellows element

Sensor (bulb)

Capillary tube

13579101112131415161718Temperature setting spindle, OIL

Main arm

Temperature setting spindle, HT

Main spring

Bellows

Capillary tube, OIL

Capillary tube, HT

Switch

Terminals

Earth terminal

Cable entry

Tumbler

Sensor (bulb)

Locking plate

Thermostat, Type KP

Dual thermostat KP 98 is used to provide protection against excessively high discharge gas temperature and to
ensure a suitable oil temperature in the compressor.

To avoid the temperature of the hot gas exceeding the maximum permissible value during extreme operating
conditions (low evaporating pressure, high condensing pressure, high suction vapour superheat) a KP 98
thermostat can be used on the high temperature side (HT). If the temperature of the hot gas becomes too high the
refrigerant will break down and the compressor discharge valve will become damaged.

The risk is greatest in refrigeration systems that operate on a high compression ratio (e.g. in systems with NH3 or
R22) and in applications with hot gas bypass.

This unit has two separate thermostat functions. The HT sensor that controls the discharge gas temperature is tted
on the discharge tube immediately after the compressor.

For larger compressors, the sensor can be built into the discharge line.

The OIL sensor that controls the oil temperature is located in the compressor oil sump.

Charges

1. Vapour charge

Figure 9: Vapour charge

Here the interdependence between the pressure and temperature of saturated vapour is utilized, i.e. the element is
charged with saturated vapour plus a small amount of liquid.

The charge is pressure-limited; a further increase in pressure after evaporation of all the liquid in the sensor (17) will
only result in a small pressure increase in the element.

This principle can be utilized in thermostats for low temperature, etc. where evaporation must be able to take place
from the free liquid surface in the sensor (within the operating range of the thermostat), and where at the same
time, the bellows must be protected against deformation when kept at normal ambient temperatures. Since the
pressure in the element depends on the temperature at the free liquid surface, the thermostat must always be
placed so that the sensor is colder than the rest of the thermostatic element.

The evaporated liquid will recondense at the coldest point, i.e. the sensor. Thus, as intended, the sensor becomes
the temperature-controlling part of the system.

 NOTE:

When the sensor is coldest, the ambient temperature has no eect on regulating accuracy.

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19

17

9

Danfoss
60-909.10.20

91719

Bellows element

Sensor (bulb)

Capillary tube

Danfoss

60-298.15.10

44

84

14

61

M4 (8 - 32 UNC)

18

18

25.4

13

23

32

8

64

Ø5

Ø5

44

122

61

27

51

14.5

35

49

25.4

M4(8 - 32 UNC)

18

25.4

Ø5

Thermostat, Type KP

2. Adsorption charge

Figure 10: Adsorption charge

In this case the charge consists partly of a superheated gas and partly of a solid having a large adsorption surface.

The solid is concentrated in the sensor (17) and it is therefore always the sensor that is the temperature-controlling
part of the thermostatic element.

The sensor can be placed warmer or colder than thermostat housing and capillary tube, but variations from 20 °C
ambient temperature will inuence the scale accuracy.

Dimensions [mm] and weights [kg]

Figure 11: KP 61 – 81

Figure 13: KP 98

Figure 12: Mounting holes (back of KP)

Figure 14: Mounting holes (back of KP)

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11

16

6.2

40

5.5

25.4

ø3.45

ø5

79.5

91.5
4

11

25.4

28.6

ø5

25.4

71.1

15

15

12

12

39

24.5

16.5

12.5

Danfoss
60-299.12.12

A

KP 61, KP 63,
KP 69

B

KP 61, KP 63

C1

KP 62, KP 68,

C2

KP 62

9.5

70

30

40 25

78

Danfoss
60-300.15.11

16

170

D2

KP 73

E2

KP 71

E3

KP 77, KP 73,
KP 75, KP 77,
KP 98

D1

KP 73,
KP 79,
KP 81

E1

KP 73

F

KP 75

9.5

9.5

10

115

85 85

95

125

25

ø5

50

40

6.4

Thermostat, Type KP

Figure 15: Wall bracket

Figure 17: Thermostat sensor types A, B and C

Figure 16: Angle bracket

Figure 18: Thermostat sensor types D, E and F

Net weight

• KP 61 - 81: approx. 0.4 kg

• KP 98: approx. 0.6 kg

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Charge

Type

Bulb type

Regulating

range

Dierential ∆t

Reset

Max. bulb

temp.

Capillary tube

length

Code no.

Lowest tem‐

perature

Highest tem‐

perature

[°C]

[°C]

[°C]

[°C]

[m]

Vapour

(1)

KP 61A-30 – 15

5.5 – 23

1.5 – 7

aut.

1202060L110066

KP 61A-30 – 15

5.5 – 23

1.5 – 7

aut.

1205060L110166

KP 61B-30 – 13

4.5 – 23

1.2 – 7

aut.

1202060L110266

KP 61B-30 – 15

5.5 – 23

1.5 – 7

aut.

120

2

060L110366

(3)

KP 61B-30 – 15

5.5 – 23

1.5 – 7

aut.

120

2

060L112866

(3) (4)

KP 61A-30 – 15

Fixed 6

Fixed 2

min.

1205060L110466

KP 61B-30 – 15

Fixed 6

Fixed 2

min.

1202060L110566

KP 62

C 1

-30 – 15

6.0 – 23

1.5 – 7

aut.

120–060L110666

KP 63A-50 – 10

10.0 – 70

2.7 – 8

aut.

1202060L110766

KP 63B-50 – 10

10.0 – 70

2.7 – 8

aut.

1202060L110866

KP 68

C 1

-5 – 35

4.5 – 25

1.8 – 7

aut.

120–060L111166

KP 69B-5 – 35

4.5 – 25

1.8 – 7

aut.

1202060L111266

Adsorbtion

(2)

KP 62

C 2

-30 – 15

5.0 – 20

2.0 – 8

aut.

80

–

060L111066

(3) (4)

KP 71

E 2

-5 – 20

3.0 – 10

2.2 –9

aut.

802060L111366

KP 71

E 2

-5 – 20

Fixed 3

Fixed 3

min.

802060L111566

KP 73

E 1

-25 – 15

12.0 – 70

8.0 – 25

aut.

802060L111766

KP 73

D 1

-25 – 15

4.0 – 10

3.5 – 9

aut.

802060L111866

(3)

KP 73

D 1

-25 – 15

Fixed 3.5

Fixed 3.5

min.

802060L113866

KP 73

D 2

-20 – 15

4.0 – 15

2.0 – 13

aut.

553060L114066

KP 73

D 1

-25 – 15

3.5 – 20

3.25 – 18

aut.

802060L114366

KP 75F0 – 35

3.5 – 16

2.5 – 12

aut.

1102060L112066

KP 75

E 2

0 – 35

3.5 – 16

2.5 – 12

aut.

1102060L113766

KP 77

E 3

20 – 60

3.5 – 10

3.5 – 10

aut.

1302060L112166

KP 77

E 3

20 – 60

3.5 – 10

3.5 – 10

aut.

1303060L112266

KP 77

E 2

20 – 60

3.5 – 10

3.5 – 10

aut.

1305060L116866

KP 79

E 3

50 – 100

5.0 – 15

5.0 – 15

aut.

1502060L112666

KP 81

E 3

80 – 150

7.0 – 20

7.0 – 20

aut.

2002060L112566

KP 81

E 3

80 – 150

Fixed 8

Fixed 8

max.

2002060L115566

KP 98

E 2

OIL: 60 – 120

OIL: Fixed 14

OIL: Fixed 14

max.

150

1

060L113166

E 2

HT: 100 – 180

HT: Fixed 25

HT: Fixed 25

max.

250

2

Thermostat, Type KP

Ordering

Table 3: Standard thermostat type KP

(1)

(1)

Bulb must always be placed colder than the thermostat housing and capillary tube. The thermostat will then regulate independent of ambient

Bulb must always be placed colder than the thermostat housing and capillary tube. The thermostat will then regulate independent of ambient
temperature.

temperature.

(2)

(2)

Bulb can be placed warmer or colder than thermostat housing and capillary tube, but variations from 20 °C ambient temperature will inuence

Bulb can be placed warmer or colder than thermostat housing and capillary tube, but variations from 20 °C ambient temperature will inuence
the scale accuracy.

the scale accuracy.

(3)

(3)

With manual switch, not isolating switch.

With manual switch, not isolating switch.

(4)

(4)

Panel mounting model with top plate.

Panel mounting model with top plate.

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Thermostat bulb types

Description

A

Danfoss
60L8012

Straight capillary tube

B

Danfoss
60L8032

ø9.5 × 70 mm remote air coil

C

Danfoss
60L8013

C1: ø40 × 30 mm air coil
C2: ø25 × 67 mm air coil
(integral with thermostat)

D

Danfoss
60L8012

D1: ø10 × 85 mm double contact remote bulb
D2: ø16 × 170 mm double contact remote bulb

 NOTE:

Cannot be used in sensor (bulb) pocket

E

Danfoss
60L8008

E1: ø6.4 × 95 mm remote bulb
E2: ø9.5 × 115 mm remote bulb
E3: ø9.5 × 85 mm remote bulb

F

Danfoss
60L8018

ø25 × 125 mm remote duct coil

Thermostat, Type KP

Table 4: Thermostat bulb types

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Document name

Document type

Document topic

Approval authority

060-9638.AA

Manufacturers Declaration

China RoHS

Danfoss

060-9650.AD

EU Declaration

LVD/RoHS

Danfoss

BV 02281-J0 BV

Marine - Safety Certicate

BV

BV SMS.W.II-2179-B.0

Marine - Manufacturing Permission

BV

CCC 2003010305069849

Electrical - Safety Certicate

CCC

DNV GL TAA000026F

Marine - Safety Certicate

DNV GL

LR 17-20046

Marine - Safety Certicate

LR

RINA ELE-086320XG-001

Marine - Safety Certicate

RINA

UL E31024

Electrical - Safety Certicate

UL

Thermostat, Type KP

Certicates, declarations, and approvals

The list contains all certicates, 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 5: Certicates, declarations, and approvals

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