Danfoss KPU Installation Manual

Installation guide
Pressure switch
KPU
Application
KPU pressure switches are for use on commercial
refrigeration and air conditioning systems to give protection
against excessively low suction pressure or excessively
high discharge pressure.
They are also used for starting and stopping refrigeration
compressors and fans on air-cooled condensers.
KPU pressure switches are fitted with the Single-Pole Single-
Throw (SPST) or Single-Pole Double-Throw (SPDT) switches,
suitable for direct as well as indirect (with a contactor) control.
KPU pressure switches are available in several pressure ranges
and are compatible with refrigerants listed below. KPU 6W and
KPU 6B are fail safe switches for high pressure refrigerants.
Standard enclosure is ~NEMA 1.
Product Specification
Application Type
¼ in
male flare
KPU 1 060-5231
KPU 1 060-5236
Low Pressure
Switch Cut Out
KPU 2 060-5237
on pressure
fall
KPU 2 060-5239
KPU1B 060-5232
Fan switch KPU 5 060-5241
High Pressure
KPU 6W 060-5243
Switch
Cut Out on
KPU
060-5244
pressure rise 6B
* 610psig - MWP for products used according to 2014/68/EU PED directive.
Installation
Select an accessible location, where the switch and pressure connection line will not be subject to damage.
© Danfoss | DCS (sb) | 2019.12
Code number
36 in. cap.
Reset
tube w. ¼
in flare nut
Auto.
060-5233
— Auto.
Auto.
060-5235
060-5240 Auto.
Man (Min.)
060-5234
060-5242 Auto.
Auto.
060-5245
Man. (Max.)
060-5246
Refrigerants:
R22, R134a, R404A, R407A, R407C, R407F, R410A*), R422B,
R422D, R438A, R448A, R449A, R450A, R452A, R507A, R513A
For complete list of approved refrigerants, go to
http://products.danfoss.com/all-products/
*) R410A only for KPU 6W and KPU 6B
Contact system
Switch
Type
action
SPDT
—
SPST(NO) close High open Low
SPST(NO) close High open Low
SPDT —
SPDT
—
SPST(NO) close High open Low
SPDT
—
SPDT
—
IMPORTANT:
Mount the pressure switch in a position that
will allow drainage of liquids away from switch
bellows. Pressure connection of the switch
must always be located on the top side of the
refrigerant line.
This reduces the possibility of oil, liquids, or
sediment collecting in the bellows, which could
cause the switch malfunction.
IMPORTANT:
Ensure the ambient temperature for the pressure
switch is higher than the refrigeration line as that
will prevent liquid migration and accumulation in
the bellows.
Max.
Regulating Differential
working
range p
pressure
[inHg] [psig] [psi]
[psig]
6 in. – 108 10 – 60 250
6 in. – 108 10 – 60 250
6 in. – 73 6 – 30 250
6 in. – 73 6 – 30 250
28 in. – 100 10 fixed 250
100 – 465 25 – 85 510
100 – 600 58 – 145 675 / 610*
100 – 600 60 fixed 675 / 610*
AN212086434305en-000101 | 520H11543 | 1
Max. Ambient
testing temp.
pressure
[psig] [°F]
290
290
290
-40 – 122
290
(175 for
290
max.
2 hours)
530
725
725