Danfoss RT 6W Pressure Switch Installation Guide
- June 3, 2024
- Danfoss
Table of Contents
Danfoss RT 6W Pressure Switch Installation Guide
Installation guide
Pressure switch
RT 6W, RT 6B, RT 6S, RT 6AW, RT 6AB, RT 6AS, RT 30AW, RT 30AB, RT 30AS with EN
12263 approval and CE marked acc. to PED (Pressure Equipment Directive)
Type /Typ| Enclosure”
Taethedsgradm
Schutzart”)
Degre
d’etancheitem| Reset| Pressure range
Trykomrade
Druckbereich
Plage de pression
[bar)| Differential (fixed)
Differens (fast)
Different (fest)
Difference (fix)
Ap
[bar)| Refrigerants Kailem idler Kaltemittel Refrigerants| Max. working press.
Till. driftstryk
Zul. Betriebsiiberdrudc
Press. de service max.
PB /MVVP
[bar) / [psigl| Max. test press. Max. provetryk Max. Prilfdruck Press. d’essai
[bar) / [psigl| Ambient temp. Omgivelsestem. Umgebungstemp. Temp. ambiante
[°C1
---|---|---|---|---|---|---|---|---
RT 6W| IP66| automat.| 5 – 25| 3.0| fluorinated refrigerants fl
fluorierte Kaltemittel refrigerants fluores| 28 / 406| 38 / 551
ll| -40 – 70
RT 6B| IP54| man. ext.| 10 – 28| fluoreded kelemidler
max. 1.0
RTES| IP66| man. int.
RT 6AW| IP66| automat.| 5 – 25| 3.0| R 717 (NH3)
+ fluorinated refrigerants + fluorerede kolem idler + fluorierte Kaltemittel
+ refrigerants fluores
RT 6AB| IP54| man. ext.| 10 – 28| max. 1.5
RT 6AS| IP66| man. int.
RT 30AW| IP66| automat.| 1 -10| 0.8| 22 / 319| 25 / 363
max. 0.4
RT 30AB| IP54| man. ext.
RT 30AS| IP66| man. int.
Fig. 10 (1) according to / i.h.t. / nach / conformément à EN 60529 / IEC 529 (2) -50 – 70 °C without PED
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 6AW, RT 6AB, RT 6AS, RT 30AW, RT 30AB, RT 30AS
Tested and approved by TÜV (Technischer Überwachungs Verein).
- W = Druckwächter (pressure control)
- B = Druckbegrenzer (pressure limiter)
- S = Sicherheitsdruckbegrenzer (safety pressure limiter)
In accordance with EN 12263 regulations, rupture of the control regulating bellows will have the effect that the refrigeration compressor stops, and cannot be restarted until the pressure control has been replaced. If the outer bellows ruptures, the control cut-out pressure falls by approx. 4 bar below the setting. The control therefore breaks the circuit at a normal condensing pressure, resulting in fail-safe function.
Common features of all designs
When the pressure in the system exceeds the setting, the control automatically
stops the system.
In particular
RT 6W, RT 6AW, RT 30AW cut in automatically when the pressure has fallen below
the setting with ∆p differential (fixed) value. RT 6B, RT 6AB, RT 30AB can be
reset by depressing the external reset button when the pressure has fallen
below the setting with ∆p differential value (fixed). RT 6S, RT 6AS, RT 30AS
can be reset by depressing the internal reset button when the pressure has
fallen below the setting with ∆p differential value (fixed). ∆p – differential
values (fixed) – according to the table fig. 10 (see also fig. 5)
Technical data
See fig. 10. Contact load: see switch cover or fig. 4. E.g. marking 10 (4) A, 400 V ~ means that a max. Ioad of 10 A ohmic and 4 A inductive may be connected on 400 V. The max. starting current on motor cutin (L.R.) may be up to seven times the inductive load, RT complies with conditions as specified in VDE 0660, Test Class II. 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. 7. If this gland is not used with a cable, a metal blinding should be also assembled.
Use the mounting holes 25, ø5 mm. The pressure control can be mounted on the valve panel or on the compressor itself. If the control is likely to be subjected to vibration, it should be mounted on a resilient base.
If pressure pulsations occur in the system at the point where the pressure control is connected, these should be effectively damped , as for example, by connecting the RT unit to the system via capillary tubing. See fig. 8.
Electrical connection
See fig. 6.
FASE = phase.
Cable diameter: 6 – 14 mm.
Earth connection to earth terminal 38.
Setting
After removing the seal cap 7, set the cut out pressure with the uncovered range spindle while reading the scale 9. Turning the range screw clockwise increases setting of the cut out pressure, turning it anticlockwise decreases setting of the cut out pressure.
Accessories
See figs. 8 and 9