HDE-CO electric duct heaters can be used as optional heaters for the HRU-ERGO energy recovery unit. Depending on the functions of heaters in the ventilation system, duct heaters can be divided into:
A preliminary heater (preheater) is installed on the exhaust duct of HRU (fresh air from outside) and it is used to preheat the air supplied to the heat recovery unit.
The preliminary heater is fitted to prevent freezing of the heat exchanger at extremely low outside temperatures and it does not affect the temperature in the room. The standard HRU-ERGO unit has an automatic frost protection function, which protects from freezing by periodic altering of fans’ speed.
It is recommended to use a heater with one contactor type HDE-CO1 or with two contactors type HDE-C02. A secondary heater is installed on the supply air duct (fresh supply air to the room) and it is used for additional heating of the supply air temperature. After connecting the heater to the HRU-ERGO unit we are able to task the temperature in the room when we feel that thermal recovery alone is not enough for our comfort. We recommend a duct heater HDE-CO2 with two contactors.
