- All heating cable circuits shall be equipped with temperature control in form of thermostats or regulators. At high outputs or temperatures near the heating cable/heated medias max. temperature, shall each circuit be supplied with separate control at pipings with long, vertical risings with risk of overheating as a result of the “chimney effect”.
- Contactors must be used when the current in the circuit exceeds the stated current for the thermostat. Observe that when the application is carried out with self-limiting heating cable must consideration be taken to start currents (see data sheet).
- The control equipment shall be installed so that it not is exposed for vibrations and as far as possible tempered surface to avoid hot well.
- Conductive sensitive temperature transmitters shall be mounted in accordance to the instructions.
- Ambient temperature transmitters shall be placed at a point, which can be considered as typical for the connected application. Take consideration to heat leakage and solar radiation.
- Capillary thermostats shall be mounted protected in a box on the pipe. Observe that the capillary must be protected mechanically.
WARNING: Handle the body of the thermostat and capillary with care. Rotary damages and folds can destroy the accuracy of the thermostat.
Control after installation
When heating cable application and connections for a circuit is ready, then immediately carry out following controls:
- Inspect the heating cable and temperature controls by hand after marks of mechanical damages. If a damage is found, the whole cable should be replaced or cut out the damaged part and joint the cable with help of a jointing kit from the cable supplier.
- Control connections and inlet nipples and that closing cover of the box are correctly sealed.
- Measure the insulation resistance with a 500V megger. All cables with an insulation resistance less than 10 megaohm shall be removed and discarded.