Electrical Pre Heater; Functional Description Of Electrical Pre Heater - Aero EVO-R Manual

b. EVO-50R/ 60R/ 80R/ 95R/ 120R/ 150R
- Loosen the bolts, remove the electrical heater until you reach the reset button and push the reset lever upward for manual
reset. (Fig. 68)
Fig. 68
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Manual reset: Manual reset temperature is 90 C. When the safety temperature limiters reach the 90 C, safety temperature
limiter is triggered, and preheater will be disconnected from the power supply.
If the manual reset is active, there is most likely a problem with the heater. Manual reset is only
to be pushed if problem is identified and solved.
o o
Automatically reset: Automatically reset temperature is 70 C. When the safety temperature limiters reach the 70 C, safety
temperature limiter is triggered, and preheater will be disconnected from the power supply. When the temperature falls below
o
70 C, the electrical heater will automatically switch on.

7.3 Electrical pre heater

7.3.1 Functional description of electrical pre heater

Electrical pre heater is used for increasing the outdoor air temperature. A pre-heater prevents the rotary heat exchanger from
freezing! It is controlled by steplessly in order to decrease the energy consumptions.
The pre-heater is equipped with two safety temperature limiters, the STL (auto reset = trigger temp. +70 °C) and (manual reset
= trigger temp. +90 °C) are connected in series. Once a safety temperature limiter is triggered, the preheater will be
disconnected from the power supply and an error will be displayed on the controller.
- Preheater enabling/disabling
Enabling/disabling of the preheater by the user/installer is possible (Refer to chapter 4.1 for commissioning)
The preheater only works if the supply air fan is operating and there are no errors. If the unit is switched to standby or unit-off
mode, the preheater will switch off immediately. The supply air fan stops 90 seconds after the pre-heater is stopped.
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