Danfoss KPU Series Installation Manual

Installation guide
Pressure switch
KPU
Application
KPU dual pressure switches are for use on commercial
refrigeration and air conditioning systems to protect
compressor against excessively low suction pressure or
excessively high discharge pressure.
KPU dual pressure switches are compatible with refrigerants
listed below. KPU16W and KP16B are fail safe switches for high
pressure refrigerants. Standard enclosure is ~ NEMA 1.
Refrigerants:
R22, R134a, R404A, R407A, R407C, R407F, R410A*), R422B, R422D,
R438A, R448A, R449A, R450A, R452A, R507A, R513A
replace with:
For complete list of approved refrigerants, visit www.products.danfoss.
com and search for individual code numbers, where refrigerants are
listed as part of technical data. /
*) R410A only for KPU 16W and KPU 16B
KPU dual 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.
Three versions of switch operation are available:
– automatic on LP and HP sides
– automatic on LP and manual reset on HP
Product Specification
Code no.
Type
⁄ in
1
4
male flare
KPU 15 060-5247
KPU 15B 060-5249
KPU 16W 060-5251
KPU 16B 060-5253
Max. working pressure:
Max. test pressure:
* 610psig - MWP for products used according to 2014/68/EU PED directive
Convertible reset:
Selection of reset function on dual pressure switches with convertible
reset – turn plate to desired reset configuration.Insert a screwdriver into
the slot on the lock disc and turn it to desired reset configuration. Do not
turn the screw on the lock disc as it may damage the convertible reset
mechanism.
LP man. LP auto.
HP man. HP man.
© Danfoss | DCS (jmn) | 2017.01
Low pressure (LP)
36 in cap. Regulating Differential
tube w. ⁄ in range
1
4
flare nut [inHg] [psig]
060-5248 6 in – 108 10 – 60
060-5250
6 in – 108 10 – 60
060-5252 6 in – 108 10 – 60
060-5254
6 in – 108 10 – 60
LP side: 250 psig
LP side: 290 psig
LP auto. LP man.
HP auto. HP auto.
– convertible manual or automatic on LP and HP sides.
Manual reset
The manual reset mechanism does not allow the pressure
switch to automatically reset after the switch has cut out. So the
pressure switch must be manually reset by the user to enable
restart of the equipment. Manual reset is possible to operate
only after return of pressure to cut in level. Before releasing
the reset it is recommended to investigate what caused the
shutdown.
Convertible reset
The convertible reset feature allows to change the operation
from automatic to manual by turning the selecting plate.
The selecting plate is located between two push buttons at the
top of the switch.
Please refer to instruction below demonstrating how to select
reset function.
High pressure (HP)
Regulating Differential
Δp range Δp
[psi] [psig] [psi]
100 – 465 60
100 – 465 60
100 – 600 60
100 – 600 60
HP side KPU 15: 510 psig
HP side KPU 15: 530 psig
Ambient temperature: -40 – 122 °F (175 °F for max. 2 hours)
Reset
Contact system
Low High
pressure pressure
Automatic Automatic
Automatic Man (Max.)
Automatic Automatic
Convertible Convertible
HP side KPU 16: 675 / 610* psig
HP side KPU 16: 725 psig
DKRCC.PI.CD0.C6.02 | 520H11521 | 1
SPST
(NO + NC)
SPDT with
LP/HP signal