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Pressure switches
*) For complete list of approved refrigerants,
www.products.danfoss.com and search for
individual code numbers, where refrigerants
are listed as part of technical data.
**) Only for RT 1A, RT 5A
Technical data
Range
(P
)
e
Type
Reset
[bar]
auto
RT 1
-0.8 – 5
RT 1A
min.
auto
RT 5
4 – 17
RT 5A
max.
RT 1A 017-500766 - adjustable differential
*1)
1.3 – 2.4 bar
RT 5 017-528466 - adjustable differential
*2)
0.6 – 3.0 bar
RT 5 017-539566 - adjustable differential
0.3 – 2.5 bar
Max. working pressure, PS / MWP:
22 bar / 315 psig
Max. test pressure, p': 25 bar
Maximum permissible bellows temperature: 70 °C
Enclosure: IP66 according to IEC 529
Contact load
See switch cover or fig. 4.
The marking, e.g.10 (4) A, 400 V ~ means
that max. connection current is 10 A
ohmic or 4 A inductive at 400 V ~. The max.
starting current on motor cutin (L.R.) may
be up to seven times the inductive load –
but max. 28 A.
The RT pressure controls comply with
conditions specified in VDE* 0660.
*VDE = Verband Deutscher Elektrotechniker
Fitting
A set of Pg13.5 cable gland is attached to
the RT in a separate bag. To ensure IP66
(units with automatic reset) or IP54 (units
with external reset) grade of RT enclosure
it is necessary to assemble this gland as
shown in the fig. 5. If this gland is not used
with a cable, a metal blinding should be
also assembled.
The pressure switch is designed for fitting
on the valve panel or the compressor. Use
the mounting holes pos. 25, fig. 1. If the
control is subjected to vibration, it should
be mounted on a soft intermediate base.
If pressure pulsations occur in the system,
such pulsations should be effectively damped,
e.g. by connecting the pressure switch to the
system through a capillary tube.
See fig. 7.
Mains connection
See fig. 6.
START = make. STOP = break
DIFF = differential
Cable diameter: 6 – 14 mm
The earth terminal 38 should be connected
to earth.
Refit protective cap.
2 | 520H11631 | DKRCC.PI.CE0.C4.72
Adjustment
See figs. 2, 3 and 6.
Set the pressure switch for minimum
actuating pressure (range setting).
NOTE: RT 5 and RT 5A with max. reset
should be set for maximum actuating
pressure (range setting). Setting is done
by rotating the main spindle 44, at the
same time reading the main scale 9. The
differential is set by rotating the differential
Adjustable
adjusting nut 19 according to the diagram
differential
∆p
in fig. 3. Maximum actuating pressure is
[bar]
the sum of the setting pressure and the
0.5 – 1.6
*1)
differential.
fixed approx. 0.5
1.2 – 4
Example
fixed approx. 1.2
*2)
A setting on "5" fig. 3. will give a differential
of approx. 1.8 bar on type RT 1A (code no.
017-500766), while the same setting on
type RT 5A will give a differential of approx.
2.3 bar.
In general, turning the main spindle
automatically moves both the maximum
and minimum actuating pressures (break
and make pressures) up or down because
of the fixed differential.
On the other hand turning the differential
adjusting nut only alters the maximum
actuating pressures.
The scale of all RT types without reset
and RT types with min. reset is calibrated
in such a way that the scale setting
corresponds to contact change-over at
minimum actuating pressure (normal
setting).
In RT switches with min. reset, the pressure
in the bellow system must increase by a
value corresponding to the differential,
before manual reset can be effected.
RT switches with max. reset have a scale
which is calibrated in such a way that
the scale setting corresponds to contact
changeover at maximum actuating
pressure. (NOTE: contrary to normal setting).
The pressure in the bellows system must
decrease by a value which corresponds to
the differential, before manual reset can be
effected.
Accessories See figs. 7 and 8.
DANSK
Pressostater
*) For komplet liste over godkendte kølemidler,
besøge www.products.danfoss.com og søg
efter individuelle bestillingsnumre, hvor
kølemidler er opført som en del af tekniske data.
**) Kun for RT 1A, RT 5A
Tekniske data
Regulerings-
område
Type
Reset
(P
)
e
[bar]
auto
RT 1
-0.8 – 5
RT 1A
min.
auto
RT 5
4 – 17
RT 5A
max.
RT 1A 017-500766 - adjustable differential
*1)
1.3 – 2.4 bar
RT 5 017-528466 - adjustable differential
*2)
0.6 – 3.0 bar
RT 5 017-539566 - adjustable differential
0.3 – 2.5 bar
Tilladeligt driftstryk, PS / MWP: 22 bar / 315 psig
Maks. prøvetryk, p': 25 bar
Maks. till. temp. i bælg: 70 °C
Tæthedsgrad: IP66 iht. IEC 529
Kontaktbelastning
Se kontaktdækslet eller fig. 4.
Mærkningen, f.eks.10(4) A, 400 V ~, angiver,
at der maks. må tilsluttes 10 A ohmsk eller
4 A induktiv belastning ved 400 V ~. Den
maksimale startstrøm ved indkobling af
motor (L.R.) må være op til syv gange den
induktive belastning – dog maks. 28 A.
RT pressostaterne opfylder betingelserne
i VDE* 0660.
*VDE = Verband Deutscher Elektrotechniker
Montering
Et sæt Pg13,5 kabelforskruning er vedlagt
produktet i en separat pose. For at sikre
kapslingsgrad IP66 (enheder med
automatisk reset) eller IP54 (enheder med
ekstern DANSK RESET) er det nødvendigt
at montere denne kabelforskruning som
vist i fig. 5. Hvis denne kabelforskruning
ikke bruges sammen med et kabel, bør der
monteres en blindprop (metal skive).
Pressostaten monteres på ventiltavlen eller
på selve kompressoren. Benyt
monteringshullerne pos. 25, fig.1. Hvis
apparatet kan blive udsat for vibrationer,
bør det monteres på et blødt underlag.
Forekommer der trykpulsationer i anlægget,
skal disse dæmpes effektivt, f.eks. ved at
tilslutte pressostaten til anlægget ved hjælp
af et kapillarrør.
See fig. 7.
El-tilslutning
See fig. 6.
START = slutte. STOP = bryde
DIFF = differens
Kabeldiameter: 6 – 14 mm
Jordforbindelse tilsluttes jordskruen 38.
Beskyttelsesdækslet monteres.
© Danfoss | DCS (jmn) | 2017.02
Indstillelig
differens
∆p
[bar]
0.5 – 1.6
*1)
fast ca. 0.5
1.2 – 4
fast ca.1.2
*2)
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