Danfoss Electronics KP Catalog Page

Shut-off and regulating valves

Thermostat

for Industrial Refrigeration

KP

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

They 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.

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 diﬀerential 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

Approvals China Compulsory Certiﬁcate, CCC

Ship approvals Germanischer Lloyd, GL (excluding KP 98)

CE-marked in accordance with EN 60947-4/-5 for sale in Europe

Registro Italiano Navale, RINA Bureau Veritas, France, BV (excluding KP 98) Lloyd’s Register, LR (excluding KP 79, KP 81, KP 98)

• 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

Underwriters Laboratories Inc., US – UL GOST

Russian Maritime Register of Shipping, RMRS

Note: Marine Approvals do not cover KP 98 dual thermostat.

AF237586440562en-000405 | 5

Thermostat, type KP

Technical data

Ambient temperature -40 – 65 °C (80 °C for max. 2 hours).

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

Contact load

Wire dimensions

Tightening torque max. 2 Nm

Rated impulse voltage 4 kV

Pollution degree 3

Short circuit protection, fuse 16 A

Insulation 400 V

Enclosure 30/44

Alternating current

Direct current DC13: 12 W, 220 V control current

solid / stranded 0.75 – 2.5 mm

ﬂexible, without ferrules 0.7 – 2.5 mm

ﬂexible, with ferrules 0.5 – 1.5 mm

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.

AC1 =16 A, 400 V

AC3 = 16 A, 400 V

2

Enclosure

IP30 to EN 60529 / IEC 529 This grade of enclosure is obtained when the unit is mounted on a ﬂat surface or bracket. The bracket must be ﬁxed so that all unused holes are covered.

Contact systems

KP temperature control KP 98

6 | AF237586440562en-000405

Thermostat, type KP

Regulating range

KP 63

KP 61

Vapour range

KP 62

KP 68

KP 69

KP 62

KP 71

KP 73

KP 75

KP 77

KP 79

KP 81

KP 98 OILKP 98 OIL

-50 0 50 100 150 200 °C

Adsorption charge

KP 98 HT

AF237586440562en-000405 | 7

Thermostat, type KP

Ordering

Charge Type Bulb

type

Setting -

range

Diﬀerential ∆t Reset Max.

Lowest

temperature

[°C] [°C] [°C] [°C] [m]

KP 61 A

KP 61 B

Vapour 1)

KP 61 A

KP 61 B

KP 62 C 1

KP 63 A

KP 63 B

KP 68 C 1

KP 69 B

KP 62 C 2

KP 71 E 2

KP 73 E 1

KP 73 D 1

KP 73 D 2

KP 73 D 1

Adsorbtion 2)

KP 75 F

KP 75 E 2

KP 77 E 3

KP 77 E 2

KP 79 E 3

KP 81 E 3

KP 98

1)

Bulb must always be placed colder than the thermostat

-30 – 15 5.5 – 23 1.5 – 7

-30 – 13 4.5 – 23 1.2 – 7

-30 – 15 5.5 – 23 1.5 – 7

-30 – 15

Fixed 6 Fixed 2 min. 120 5 060L110466

Fixed 6 Fixed 2 min. 120 2 060L110566

-30 – 15 6.0 – 23 1.5 – 7

-50 – 10 10.0 – 70 2.7 – 8

-5 – 35 4.5 – 25 1.8 – 7

-30 – 15 5.0 – 20 2.0 – 8

-5 – 20 3.0 – 10 2.2 –9

-5 – 20

Fixed 3 Fixed 3 min. 80 2 060L111566

-25 – 15 12.0 – 70 8.0 – 25

-25 – 15 4.0 – 10 3.5 – 9

-25 – 15

Fixed 3.5 Fixed 3.5 min. 80 2 060L113866

-20 – 15 4.0 – 15 2.0 – 13

-25 – 15 3.5 – 20 3.25 – 18 0 – 35 3.5 – 16 2.5 – 12 0 – 35 3.5 – 16 2.5 – 12

20 – 60 3.5 – 10 3.5 – 10 20 – 60 3.5 – 10 3.5 – 10

20 – 60 3.5 – 10 3.5 – 10 50 – 100 5.0 – 15 5.0 – 15 80 – 150 7.0 – 20 7.0 – 20

Fixed 8 Fixed 8 max. 200 2 060L115566

OIL: Fixed 14 OIL: Fixed 14 max. 150 1

HT: Fixed 25 HT: Fixed 25 max. 250 2

E 2

80 – 150

OIL: 60 – 120

HT: 100 – 180

housing and capillary tube. The thermostat will then regulate independent of ambient temperature.

2

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

Capillary-

bulb

Highest

temperature

temp.

tube

length

aut. 120 2 060L110066

aut. 120 5 060L110166

aut. 120 2 060L110266

aut. 120 2 060L110366 3)

aut. 120 2 060L112866 3) 4)

aut. 120 – 060L110666

aut. 120 2 060L110766

aut. 120 2 060L110866

aut. 120 – 060L111166

aut. 120 2 060L111266

aut. 80 – 060L111066 3) 4)

aut. 80 2 060L111366

aut. 80 2 060L111766

aut. 80 2 060L111866 3)

aut. 55 3 060L114066

aut. 80 2 060L114366

aut. 110 2 060L112066

aut. 110 2 060L113766

aut. 130 2 060L112166

aut. 130 3 060L112266

aut. 130 5 060L116866

aut. 150 2 060L112666

aut. 200 2 060L112566

3

) With manual switch, not isolating switch.

4

) Panel mounting model with top plate.

Code no.

060L113166

8 | AF237586440562en-000405

Thermostat, type KP

Ordering

(continued)

Thermostat bulb types

A Straight capillary tube

B ø9.5 × 70 mm remote air coil

C

D

E

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

D1: ø10 × 85 mm double contact remote bulb D2: ø16 × 170 mm double contact remote bulb Note! Cannot be used in sensor (bulb) pocket

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

F ø25 × 125 mm remote duct coil

AF237586440562en-000405 | 9

Thermostat, type KP

60-904.12

17

Danfoss

60-1033.10

Danf

60-272.12

17

Danfoss

60-1032.10

Design / function

1. Temperature setting spindle

2. Diﬀerential setting spindle

3. Main arm

7. Main spring

8. Diﬀerential spring

9. Bellows

12. Switch

13. Terminals

14. Earth terminal

15. Cable entr y

16. Tumbler

17. Sensor

Key sketch of KP thermostat KP thermostat

1

16

2

3

7

1

4

Danfoss

60-296.16

2

8

9

15

17

12

Danfoss

Adsorption charge

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.

oss

Adsorption charge

The design of the KP thermostats aﬀords the following advantages:

y high contact load, y ultra-short bounce time, y vibration resistance up to 4 g,

in the range 0 – 1000 Hz,

y long mechanical and electrical life.

Vapour charge

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Thermostat, type KP

60-421.13

Design / function

(continued)

1. Temperature setting spindle, OIL

3. Main arm

5. Temperature setting spindle, HT

7. Main spring

9. Bellows

10. Capillary tube, OIL

11. Capillary tube, HT

12. Switch

13. Terminals

14. Earth terminal

15. Cable entry

16. Tumbler

17. Sensor (bulb)

18. Locking plate

KP thermostat, dual type

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.

Danfoss

60-370.16

Danfoss

The risk is greatest in refrigeration systems that operate on a high compression ratio (e.g. in systems with NH hot gas bypass.

or R22) and in applications with

3

This unit has two separate thermostat functions. The HT sensor that controls the discharge gas temperature is ﬁtted 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.

Terminology

Diﬀerential

The diﬀerential is the diﬀerence between the make and break temperatures. A diﬀerential is necessary for satisfactory automatic operation of the plant.

Mechanical diﬀerential (intrinsic diﬀerential)

The mechanical diﬀerential is the diﬀerential set by the diﬀerential spindle.

Operating diﬀerential (thermal diﬀerential)

The operating diﬀerential is the diﬀerential the plant operates on. Operating diﬀerential is the sum of the mechanical diﬀerential and the diﬀerential 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.

2. Automatic reset: These units are automatically reset after operational stop.

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Thermostat, type KP

Setting

Charges

9. Bellows element

17. Sensor (bulb)

19. Capillary tube

Thermostats with automatic reset

Set the upper activating temperature on the range scale. Set the diﬀerential 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 diﬀerential setting. Note that the diﬀerential depends on the range setting. Therefore, the diﬀerential scale must only be used as guideline. If with low stop temperature settings the compressor will not stop, check whether the diﬀerential is set at too high a value!

1. 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.

Thermostats with minimum reset

Set the stop temperature on the range scale. The diﬀerential is a ﬁxed 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 ﬁxed diﬀerential setting.

Thermostats with maximum reset

Set the stop temperature on the range scale. The diﬀerential is a ﬁxed 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 ﬁxed diﬀerential setting.

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 eﬀect on regulating accuracy.

9. Bellows element

17. Sensor (bulb)

19. Capillary tube

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2. 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 inﬂuence the scale accuracy.

Thermostat, type KP

Danfoss

60-986.12

Danfoss

60-985.12

Dimensions [mm] and weights [kg]

KP 61 – 81

KP 98

Wall bracket Angle bracket

Mounting holes (back of KP)

D2: E2: E3: KP 73 KP 71 KP 77, KP 73 KP 75, KP 77, KP 98

D1: E1: F: KP 73 KP 73 KP 75 KP 79 KP 81

C2: KP 62

A: B: C1: KP 61, KP 61, KP 62, KP 63 KP 63, KP 68 KP 69

Net weight:

KP 61 – 81: approx. 0.4 kg

KP 98: approx. 0.6 kg

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Danfoss Electronics KP Catalog Page

Specifications and Main Features

Frequently Asked Questions

User Manual