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ENGLISH
PRESSURE SWITCH
Tested and approved TÜV
(Technischer Überwachungs Verein)
in accordance with EN 12263
B = Druckbegrenzer
(Pressure switch with external reset)
S = Sicherheitedruckbegrenzer
(Pressure switch with internal reset)
In compliance with EN 12263, a rupture of
the high pressure bellows in the switch will
stop the refrigeration plant compressor.
It will not be possible to restart the com-
pressor until the pressure switch has been
replaced.
A rupture of the outer bellows will cause the
break pressure of the switch to fall approx.
3 bar under the set value. This means that
the switch will break at normal condensing
pressure, i.e. a „fail safe" function is ensured.
The B side can be reset with the external
button when the pressure has fallen approx.
4 bar under the set stop pressure.
The S side can be reset with the internal
button when the pressure has fallen approx.
4 bar under the set stop pressure.
Fig. 1
1. Range spindle, S-side
3. Main arm
5. Range spindle, B-side
15. Cable entry
18. Locking plate
19. Arm
TECHNICAL DATA
Permissible ambient temperature
-25 – 65 °C (80 °C for max. 2 h)
Range: 8 – 32 bar (p
)
e
Relative humidity: 30 – 98%
Vibration resistance: 4 g (10 – 1000 Hz)
Max. permissible test pressure: 35 bar (p
Max. working pressure: 35 bar (p
Enclosure
In accordance with EN 60529: IP30 (VDE).
It is assumed that the switch will be mount-
ed on a smooth panel or bracket.
The bracket must be positioned on the unit
so that all clear holes are covered. See fig. 13.
Contact load
See the S scale in the switch.
Max. start current = 112 A, 380 V.
Short circuit protection: Fuse 16 Amp.
Application in accordance with UL-
requirements:
120 V a.c.: 16 FLA, 96 LRA
240 V a.c.: 8 FLA, 48 LRA
240 V d.c.: 12 W pilot duty
FITTING
The KP 7BS is fitted with a damping orifice.
It is therefore not usually necessary to use
© Danfoss | DCS (jmn) | 2016.10
damping coils. The KP 7BS is connected
with
/
in. copper tube.
1
4
Figs. 2 and 3
As far as possible, position the switch
above the plant piping system. A mounting
bracket can be supplied. See fig. 12. Avoid
connection in or near liquid pockets.
Fig. 4
When tightening or loosening the flare
coupling, hold the connector steady by
applying a counterforce.
CAUTION!
Disconnect power supply before wiring
connections are made or service to avoid
possible electrical shock or damage
to equipment.
Do never touch live parts with your fingers
or with any tool.
ELECTRICAL CONNECTION
Fig. 5
The switch is equipped with a cable entry for
6 – 14 mm cable (15, fig. 1). This Pg 13.5 entry can
be obtained as an accessory (fig. 14). Use terminals
B and C. The order in which they are used is not
important. Terminal A must not be used.
TESTING
Fig. 6
S side
Tilt the main arm (3). At the same time
operate the internal RESET button
Fig. 7
B side
Tilt the arm (19) with, for example, a screw-
driver. At the same time operate the
external RESET button. Be careful not to
)
damage the bellows with the screwdriver!
e
)
e
NOTE! Use only the methods shown when
testing. The contact system must never be
activated with a screwdriver or similar tool.
SETTING
Fig. 8
Set the stop pressure on the STOP scales.
Check the set pressure with a pressure
gauge. Set the S side 2 – 3 bar higher than
the B side. The differential is fixed
at approx. 4 bar.
The compressor motor can be restarted
after stop by pressing the RESET buttons.
Restart is possible only when the pressure
has fallen approx. 4 bar under the set stop
pressure.
Fig. 9
Setting example.
Required stop pressure = 13 bar (p
Differential = 4 bar.
The compressor can be restart when
the pressure has fallen to 13 - 4 = 9 bar.
Set the required stop pressure.
Fig. 10
Locking the setting.
The range spindles can be locked with the
locking plates.
Fig. 11
Locking and sealing.
ACCESSORIES
Fig. 12
Two types of mounting brackets (wall
bracket and angle bracket) complete with
screws and washers can be supplied.
Fig. 13
Positioning the angle bracket.
Fig. 14
Pg 13.5 screwed cable entry with special
nut. To be ordered separately. For use with
6 – 14 mm cable.
With 8 – 16 mm cable use a standard Pg 16
screwed cable entry.
DOBBELT HØJTRYKSPRESSOSTAT
Afprøvet og godkendt af TÜV
(Technischer Überwachungs Verein)
i henhold til EN 12263
B = Druckbegrenzer (trykbegrænser)
S = Sicherheitsdruckbegrenzer
(sikkerhedstrykbegrænser)
I overensstemmelse med EN 12263 vil brud
på apparatets højtryksbælge medføre, at
køleanlæggets kompressor standser. Den
vil først kunne genstartes, når pressostaten
er udskiftet. Ved brud på den ydre bælg
falder apparatets brydetryk ca. 3 bar under
den indstillede værdi. Apparatet afbryder
således ved normalt kondensatortryk.
Herved opnås en »fail safe« funktion.
B-siden kan genindkobles med udvendig
reset- knap, når trykket er faldet ca. 4 bar
under det indstillede stoptryk. S-siden kan
genindkobles med indvendig reset-knap,
når trykket er faldet ca. 4 bar under det
indstillede tryk.
Fig. 1
1. Områdespindel, S-side
3. Hovedarm
5. Områdespindel, B-side
15. Kabelgennemføring
18. Låseplade
)
e
19. Arm
DKRCC.PI.CA0.B4.57 | 520H846 | 2
DANSK
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