Nagas ABE Series, Installation, Operation And Maintenance Manual

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18 of 45
Installation, operation, and maintenance manual-ABE Rev 1_2023
Status by BACnet MSTP or IP communication:

Temperature readings of each sensor in the unit.
- Outside sensor.
- Supply sensor.
- Return air sensor.
- Exhaust sensor.

Notification of alarms.

Fan airflow reading (CFM).
7.4. CONTROL OF THE RECUPERATION
The internal controller of the unit tends to maintain the supply set point (adjustable from 50F to 75F)
by varying the cycle time of the recuperator between 20 to 120 seconds.
Heating recovery mode

If the outside temperature is lower than the temperature differential (adjustable from ±2 to
±10F) of the supply setpoint and the return temperature is greater than the supply setpoint,
the unit is in heating recovery mode. The controller modulates the recuperator dampers to
maintain the desired set point by varying the cycle time of the dampers between 20 and 120
sec.
Cooling recovery mode
 If the outside temperature is higher than the temperature differential (adjustable from ±2 to
±10F) of the supply setpoint and the return temperature is lower than the supply setpoint, the
unit is in cooling recovery mode. The controller modulates the dampers to maintain the desired
set point by varying the cycle time of the dampers between 20 and 120 sec.
Cleaning mode
 If the unit is not in heating recovery mode or cooling recovery mode, the recuperator is in
cleaning mode and cycles every 60 minutes.