PRE HEATER INSTALLATION COUNTER FLOW 134351A003

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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°. This
is a lack of 14°.
In this example a set point for the pre-heater needs to be +10°. Set point must be chosen according to heat capacity
and airflow.
Example 2: Run if units is running. In this case you need to have a set point at 0°.
Pre-heater will be active below 0° during normal operation. To use this option configuration must be changed.
Same extra sensor as above is used.
It can also be used for a unit in a very cold location when heating capacity isn’t enough. For example -30°. Set point de-
pending of heat capacity and airflow. In this case a set point can be, for example -18°.
134351 | A003