Electrical connection accessoriesExternal electrical preheating elementIf Compact P has not been purchased in the Polar version with integral preheating element, there is anoption for purchasing an external electrical preheating element for subsequent installation.The electric preheating element is mounted in the outdoor air duct before the unit with the necessarytemperature sensor, and connected to an external power supply.1x230V ~ 50 Hz max. 16A7 8Min. 32 cmT8ATTENTIONIt is important that the temperature sensor for the heating element is positioned at least 32 cmafter the preheating element in order to achieve correct regulation.The T8 outdoor air temperature sensor is positioned before the external preheating element andconnected to the Compact P control system, to allow it to perform regulation via the outdoor airtemperature. If it is not wished to regulate the functions via the outdoor air temperature, T8 may bedeactivated in the software under the frost protection section.The pre-heating element has a three-step safety system that prevents overheating.1. An operating thermostat regulates the heating and ensures that the supply air temperature doesnot fall below -1 °C2. There is a max. thermostat, which shuts down the preheating element if the temperature risesabove 50 °C (For vertical mounting with airflow downwards, the preheating surface will switch offat 70 ° C).3. A safety thermostat switches off the pre-heating element if the temperature exceeds 100 °C.Then, you must reset it manually.4. Minimum air volume at Ø160. 110 m3/hATTENTIONWhen mounting the electric preheating element, there must be a safety gap of minimum 15 cmfrom any flammable material. The heating element must be insulated with a fire retardantinsulation material. The cover of the connection box, however, must not be insulated.24