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INSTALLATION & SERVICE MANUAL FOR PROFESSIONALS
Product description: Control system strategy
2. Fireplace in house is the alternative defrosting strategy, that can be chosen via PC Tool.
• Both the supply and exhaust air fan speed will slowly decrease until the minimum
RPM is reached
• After 10 seconds both fans will stop completely for four hours.
• When the defrosting is done both fans will start at minimum RPM and increase
speed until the originally requested speed is reached.
If the outdoor temperature is ≤ -13 °C for more than 4 minutes 25 seconds and you do not
have a preheater installed, the unit will stop all operation for 30 minutes. This will happen
even with defrost mode activated.
After 30 minutes the unit will attempt to start up - activating the previous operating mode.
If however an electrical preheater is installed, this safety operation stop is automatically
disabled.
Alternative de-
frosting strategy
Operation stop
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