Raychem HWAT-ECO Mode D'emploi page 12

2.3.4 Temperature Sensor (KTY or PT100)
The temperature sensor should be connected
to a single or master unit only. Connect both
wires of the sensor to the TEMP terminal in
the unit, see Fig. 4. The sensor wires do not
have a special polarity. To connect a wire use
a screwdriver to push down the orange tab on
the side of the terminal. Put the wire into the
hole and release the orange tab. The sensor
should be connected as near as possible to the
boiler (5.5 Diagrams, ).
The metal tabs can be folded around the hot
water output pipe. Use the aluminium tape
(included) to attach the sensor to the pipe.
The sensor and at
sensor cable should be covered by insulation.
Be careful not to install the heating cable too
close to the sensor, keep a clearance of at
least 20 cm. The standard temperature sensor
cable can be extended up to 100 meter. The
extension cable should have a basic insulation
of 500 V and a solid core of at least 0,75 mm
The optional PT100 sensor cable must not exceed 20 meters. If a PT100
sensor is used a short must be installed (Fig. 4, page 13).
2.3.5 Alarm wiring
The alarm contact (24 VAC, 24 VDC, 1A) inside the unit can be used to
switch an external device. The contact can be selected for NO or NC opera-
tion. In a network all alarm contacts should be connected in series. The
alarm terminal is located in the upper right corner of the unit and has the
text "alarm contact" next to it. To connect a wire use a screwdriver to push
down the orange tab on the side of the terminal. Put the wire into the hole
and release the orange tab. The wires used for the alarm contact should
have a dielectric strength of 500 V. See Chapter 4 for alarm relay conditions.
Note: For master/slave combination with alarm function, the alarms need to
be connected in series by a RS485 shielded wire. Due to the limited amount
of holes in the sealing ring of the cable gland, the alarm wire and BMS wire
can be combined in a 4 wire cable.
12
A
least 200 mm of the
Fig. 4
Terminals
inside the
HWAT-ECO.
Standard temperature sensor
BA
TEMP
PT100 sensor (2 wire)
BA
TEMP
short
for
PT100
(@ 100m).
2
NO C NC
BMS
BMS