nVent RAYCHEM Elexant 450c Instructions D'installation page 4

2.2 Sensor installations
Location of the sensor: on pipe - see picture E1
• as indicated in the system design documentation
• not on valves, flanges, supports, pumps or other heat sinks
• at the top of the pipe for thermally sensitive pipe contents (A)
• on lower quadrant of pipe 90° for single heating cable (B)
• on lower quadrant of pipe centrally between the heating cables if they are two or
more
Attachment of the sensor
• fix sensor firmly on surface with adequate fixing tape (same tape as used to fix
heater to the pipe) in two places (D)
• fix sensor parallel to pipe (D)
• route sensor cable and eventual extension cable to avoid damage in use. Fix to
pipe with adequate tape where appropriate
Location of the sensor: outdoor - see picture E2
Mount the sensor in a position exposed to normal weather conditions but shielded
from direct sunlight. The sensor should not be located against surfaces that are
heated from within or may be heated by sunlight.
Warning: Do not install sensor at ambient temperatures below –20°C. Do not bend
the final 50mm of the sensor. Min. bending radius for sensor cable: 10 mm.
Wiring sensor to Elexant 450c
Enter the sensor cable according to the drawing for sensor 1 or sensor 2 shown in the
wiring diagram (page 2). Please pay attention to color coding of the wiring.
Sensor extension
The sensor cable can be extended up to 150 m when a cross section of 2 x 1,5 mm²
is used (max. 20 Ω per conductor). The connection between sensor cable and sensor
extension can be made in junction box JB-86 or equivalent. Use a shielded cable for
extension to avoid interference. The shielding braid is to be earthed in the panel/
thermostat.
Ensure that the pipe and sensor are thermally insulated and clad to the design
specification after installation of the thermostat.
3. OPERATION
If Elexant 450c is not programmed, the unit will start a quickstart menu after powering
up. For further detailed parameters and settings use the separate operation manual.
This can be downloaded from www.nventthermal.co.uk.
Note: The pre-programming of the controller can be done with an external power-bank
in case of no power supply on site during controller/panel installation.
4 | nVent.com