Submittal Sheet
© Danfoss | DCS (rm) | 2019.12
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Danfoss
60-971.13.10
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Danfoss
60-970.12.10
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Danfoss
60-970.12.10
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Danfoss
60-909.11.10
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IC.PD.P10.F9.02 | 12
Data sheet | Pressure switch and Thermostat, KP and KPI
Design / Function Key sketch of KP thermostat, types KP 78, KP 79, KP 81
1. Temperature setting
spindle
2. Differential setting
spindle
3. Main arm
4. Main spring
5. Differential spring
6. Bellows
7. Sensor
8. Contact system
9. Connection terminals
10. Earth terminal
11. Cable entry
12. Tumbler
The contact system in KP thermostats has a snap
function. This means that the bellows is active
only when the cut-in or cut-out value is reached.
KP 75 room sensor
Absorption charge
The charge consists partly of a superheated gas
and partly of a solid substance with a large
absorption surface.
The solid substance is concentrated in the sensor
(7), and consequently it is always the sensor that
comprises the temperature-regulating part of
the thermostatic element.
The sensor can be placed both warmer or colder
than the thermostat housing and capillary tube.
However, placing it in an ambient temperature
higher or lower than 20 °C can affect the
accuracy of the scale.
Charges
6. Bellows
7. Sensor
13. Capillary tube
Thermostats with automatic reset
Set the upper limit temperature on the range
scale. Then set the differential on the DIFF scale.
The temperature set on the range scale is also
the temperature at which contact changeover
re-occurs on rising temperature.
The contacts changeover when the temperature
has fallen to a value lower than that set on the
DIFF scale.
If at lower settings the plant will not start/stop,
the reason might be that the differential has
been set too high.
Thermostats with minimum reset
Set the temperature on the range scale.
The differential setting is fixed.
Min. reset units will restart after the temperature
at the thermostat sensor has risen by a value
greater than that of the fixed differential.
Thermostats with maximum reset
Set the stop temperature on the range scale.
The differential setting is fixed.
Max. reset units will restart after the temperature
at the thermostat sensor has fallen by a value
greater than that of the fixed differential.
Setting