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
Thermostat, Type KP
Portfolio overview
<![if ! IE]><![endif]>Danfoss1038
<![if ! IE]><![endif]>-60
KP 61
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Vapour range |
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KP 62 |
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KP 63 |
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KP 68 |
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KP 69 |
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Adsorption charge |
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KP 62 |
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KP 71 |
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KP 73 |
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KP 75 |
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KP 77 |
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KP 79 |
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KP 81 |
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KP 98 HT |
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KP 98 OIL |
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KP 98 OIL |
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KP 98 HT |
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-50 |
0 |
50 |
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100 |
150 |
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200°C |
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© Danfoss | Climate Solutions | 2021.03 |
AI203586420959en-000801 | 2 |
Thermostat, Type KP
Product speci€cation
Technical data
Table 1: Technical data
Features |
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Description |
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Ambient temperature |
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-40 – 65 °C (80 °C for max. 2 hours) |
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Switch |
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Single-pole, double-throw (SPDT) changeover switch |
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Alternating current |
AC1 =16 A, 400 V |
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Contact load |
AC3 = 16 A, 400 V |
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Direct current |
DC13: 12 W, 220 V control current |
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solid / stranded |
0.75 – 2.5 mm2 |
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Wire dimensions |
flexible, without ferrules |
0.7 – 2.5 mm2 |
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flexible, with ferrules |
0.5 – 1.5 mm2 |
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Tightening torque |
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max. 2 Nm |
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Rated impulse voltage |
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4 kV |
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Pollution degree |
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3 |
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Short circuit protection, fuse |
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16 A |
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Insulation |
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400 V |
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Enclosure |
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IP30 / IP44 |
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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 flat surface or bracket. The bracket must be fixed so that all unused holes are covered.
Contact systems
Table 2: Contact systems
KP temperature control |
KP 98 |
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SPDT |
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4 |
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Line |
M |
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1 |
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16A |
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2 |
<![endif]>Danfoss 60-1031.10
16A A |
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M |
B |
C |
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OIL |
HT |
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Q |
<![if ! IE]> <![endif]>Danfoss 60-894.12 |
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.
© Danfoss | Climate Solutions | 2021.03 |
AI203586420959en-000801 | 3 |
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 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 di€erential setting.
Thermostats with maximum reset
Set the stop temperature on the range scale. The di€erential 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 di€erential setting.
Design and function
Figure 1: Key sketch of KP thermostat |
Figure 2: KP thermostat |
1
2
3
7
8
9
15
17
16 |
<![if ! IE]> <![endif]>Danfoss 60-296.16 |
3 |
1 |
8 |
2 |
16 |
12 |
<![if ! IE]> <![endif]>Danfoss 60-1032.10 |
7
4 |
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1 |
13 |
2 |
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14
9 
12
15
© Danfoss | Climate Solutions | 2021.03 |
AI203586420959en-000801 | 4 |
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