General A a pre-heater is available as an accessory for Systemair Topvex units with counterflow heat exchanger. A pre-heater can be installed in the outdoor duct to prevent icing in the heat exchanger. The kit contains of 1 expansion module, 1 pre-heater, 1 outdoor air sensor and 1 instruction.
Installation | Corrigo Function via expansion unit. Log on with admin rights in Corrigo. Main menu item Sub-menu item 1 Sub-menu item 2 Explanations → Access rights → Log on Log on Log on to service level by entering Enter password xxxx a 4-digit code.
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| Installation Example 1: Run if defrosting. If pre-heater is used in order to maintain supply temperature at desired level. For example, desired supply temperature is +20°, the outside air is -4° and the heater has an capacity of 10°. This is enough during normal operation on these units but during bypass defrosting the heater needs an capacity of 24°.
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