0045
0539
II2G
0539
© Danfoss | Climate Solutions | 2022.11
2 | AN179486437343en-001102
Technical data
Maximum Working Pressure:
Type
RT 113E RT 112E RT 1AE RT 116E RT 5E
RT 6AEW
RT 6AEB
RT 6AES
RT 117E RT 121E RT 260AE RT 262AE
MWP
[bar]
0.4
7
22
22
22
34
1
)
42
7
22
11
1
)
28 bar P
e
when used as safety equipment acc. to EN12263
Permissible ambient temperature:
-20 – 65 °C
Intrinsically safe specification:
Ui = 29 V Ci = 0.5 nF
li = 0.5 A Li = 0.2 µH
Pi = 1 W
Contact load:
max. 100 mA, 30 V AC / DC
min. 1 mA, 5 V AC / DC
Must be used with a certified Ex ia barrier
satisfying the input parameters.
Installation
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. 6. If this gland is not used with a cable, a metal
blinding should be also assembled.
The RT pressure switch is designed for fitting on the valve panel or the
compressor. Use the mounting holes (25). If the unit can be exposend
to vibration, it should be mounted on a resilient pad. If pressure
pulsations occur in the system at the point where the pressure switch
is connected, these should be effectively damped, as for example, by
connecting the RT unit to the system via damping coil.
Electrical connection
(see fig. 8 and fig. 9)
START = make. STOP = break. DIFF = differential.
Cable diameter: 6 – 14 mm
The earth terminal (38) should be connected to earth.
Wire dimension: min. 0,75 mm²
Adjustment
RT 1AE, RT 116E, RT 5E, RT 117E, RT 112E, RT 113E, RT 121E
(see fig. 1, fig. 2 and fig. 8)
Set the pressure switch for minimum actuating pressure (range setting).
Setting is done by rotating the knob (5), at the same time reading the
main scale (9).
The differential is set by rotating the differential adjusting nut (19)
according to the nomogram concerned (fig. 5 or fig 7).
Maximum actuating pressure is the sum of the pressure setting and the
differential.
RT 260AE, RT 262AE
See fig. 4 and fig. 8
Set the required differential pressure with the setting disc (5) while at
the same time reading the scale (9).
RT 6AEW, RT 6AEB, RT 6AES (see fig. 3 and fig. 9)
After removing the seal cap (7), set the cut out pressure with the
uncovered range spindle while reading the scale (9).
Safety requirements
1.
The refrigeration system must always comply with European
Ex installation standard, EN 60079-14, any local directive and
legislation as well as any other regulation applying in the area of
installation.
2.
RT-E switch must be used only with reliable means of limiting
the voltage and current to prevent sparks between the contact
surfaces. The equipment to be used for electrical load limiting
must always be approved for use in the zone concerned.
3.
Cable and cable entries approved for the application must be used.
Cables must not be in contact with sharp edges. The cable must
be connected with adequate stress relief in order to prevent that
pulling forces can be carried through the cable to the terminal.
4.
In the event of pressure pulsations in the system, where the switch
is connected, these must be effectively damped to prevent fatigue
failure on the bellows. The cycle frequency of the RT-E switch must
be kept as low as possible. The vibration level must be kept as low
as possible.
5.
It is recommended to regularly check the function of the RT-E
switch.
6.
Only apparatus designed, constructed and released by Danfoss
must be used for application concerned. Danfoss can accept no
responsibility in case of alterations made on the pressure switches
or the use of them against the instructions of Danfoss.
7.
Any overload of the RT switch must be prevented. Overloaded or
damaged apparatus must be exchanged.
8.
Only authorised persons, who are certified in installing and
maintaining refrigration system may do the installation,
maintenance and exchange of the switch.
9.
Use only appropriate tools.
10.
Dispose of the switch in an environmentally-friendly way.
11.
RTE switches must be installed in area where is low risk of
mechanical damage.
12.
Components within the equipment can exceed the enclosure
temperature by 1K (1°C). When the media temperature exceeds
80°C, it is the responsibility of the user to ensure that the media
temperature does not cause a thermal ignition risk on parts
between the media and the switch enclosure. Maximum media
temperature on pressure switch is 100°C.
13.
Isolation of the intrinsically safe circuit to ground and to the
contact mounting screw has been verified through 500VACrms
dielectric strength testing, carried out in accordance with IEC
60079-11:2011 section 10.3.
14.
Surface of the front cover is sputtered with stainless steel - avoid
abrasion.
15.
Power must be switched off before maintenance and opening the
RT-E.
Specific conditions of use:
The enclosure fascia has been coated with a layer of stainless steel to prevent the
accumulation of electrostatic charge. In order to ensure that there is no accumulation of
electrostatic charge on the enclosure, the end user shall ensure that the external metal
work of the enclosure is locally bonded to earth. Information on the durability of the
coating with regards to use of the equipment is contained within the instruction manual.
Temperature class
Process temperature limit [°C]
T4 – T1
T5
T6
100
94
79
Product marking: RT 6AEW, RT 6AEB, RT 6AES
Ex ia IIC T6...T1 Gb -20 °C ≤ Ta ≤ 65 °C
DEMKO 14 ATEX 1406X, Rev. 3
IECEx ULD 14.0013X
U
i
= 29 V I
i
= 0.5 A P
i
= 1 W
C
i
= 0.5 nF L
i
= 0.2 μH
II2G
Product marking: RT112E, RT113E, RT1AE, RT116E,
RT5E, RT117E, RT260AE, RT262AE, RT9E, RT14E,
RT101E, RT107E, RT121E, RT123E
Ex ia IIC T6...T1 Gb -20 °C ≤ Ta ≤ 65 °C
DEMKO 14 ATEX 1406X, Rev. 3
IECEx ULD 14.0013X
U
i
= 29 V I
i
= 0.5 A P
i
= 1 W
C
i
= 0.5 nF L
i
= 0.2 μH
