Submittal Sheet

© Danfoss | DCS (rm) | 2019.12
Danfoss
60-1175.12.10
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IC.PD.P10.F9.02 | 9
Data sheet | Pressure switch and Thermostat, KP and KPI
Water supply from reservoir or well
The contact system in the KP 44 has a snap-
action function and allows the bellows moves
only when the cut-in or cut-out value is reached.
If water is running short in the well or reservoir,
the pump will no longer be able to increase the
pressure to the cut-out value. Consequently the
pump will keep running - perhaps without water.
However, the KP 44 pressure switch will stop the
pump as soon as the righthand bellows pressure
drops below the safety cut-out setting.
The pump can be started again by lifting the
impulse lever. The pump will continue to operate
when the impulse lever is released, provided that
the righthand bellows pressure is higher than the
safety cut-out setting plus a fixed differential
of 1 bar. If this is not the case, the pump
will cut-out again indicating insufficient
water supply.
Pressurized water supply direct to pump
When water supply fails on the inlet side,
the pump will no longer be able to boost the
pressure to the cut-out value. Consequently the
pump will keep running - perhaps without water.
However, the KP 44 pressure switch will stop the
pump as soon as the pressure in the pump
suction line drops below the safety cut-out
setting. The pump will automatically start again
when the pump suction pressure has reached
the level of 1 bar above the safety cut-out
setting.
Automatic start-up will only take place if the
righthand bellows is connected to the pump
suction line. Air pockets should be avoided to
prevent the pump from starting up on air
pressure rise, without the presence of water.
In a hydrophore system where water is pumped
from a well or an open tank, both bellows are
connected to a pressure outlet on the air
side in the pump pressure line, if possible.
In a booster system receiving pressurized
water the righthand bellows is connected
• to the low pressure side of the pump
forautomatic start-up
• to the high pressure side of the pump
for manual start-up
The lefthand bellows is always connected
to the high pressure side of the pump.
1. Lefthand pressure
setting spindle
2. Differential setting
spindle
3. Main arm
4. Righthand pressure
setting spindle
5. Main spring
6. Differential spring
7. Bellows
8. Pressure connections
9. Contact system
10. Terminal
11. Earth terminal
12. Cable entry
13. Tumbler
14. Locking plate
15. Impulse lever
Design / Function Key contact system of KP 44 pressure switch