Nagas ABE Series, Installation, Operation And Maintenance Manual

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Installation, operation, and maintenance manual-ABE Rev 1_2023
Commands and status (dry contact):

Starting the unit.

Supply temperature setpoint via a 2-10Vdc signal (see table).

Control instructions for variable speed drives via a 0-10 Volts Ex signal: 5 volts = 30 Hertz, 10 volts = 60
Hertz; depending on the CFM reading. The user must adjust the voltage according to the required flow
rate
.
VOLTAGE TEMPERATURE
2.0 55°F/13°C
4.0 60°F/16°C
6.0 65°F/18°C
8.0 70°F/21°C (Default)
10.0 75°F/24°C
If the signal is less than 1.8Vdc, the controller will assume that a problem has occurred and will use the default
set point of 70°F/21°C
7.3. BACNET CONTROL MODE
Start sequence:

Starting the unit via BACnet communication (MSTP or IP).

The fresh air and exhaust dampers open at their maximum position.

Following the proof of opening of the fresh air and exhaust dampers, the supply and exhaust fans
start at the chosen speed (CFM) according to the instruction sent via BACnet.

The recuperator starts and modulates according to the supply temperature setpoint via BACnet
communication.

Alarms are sent via BACnet communication.
Note: There is no remote display with the BACnet option .
A dry contact is used to start the unit with default values in the absence of a BACnet.
Consultation on the unit control screen (HMI):

Supply temperature setpoint (°F/°C).

VFD speed setpoint (CFM).
 Temperature readings of each sensor in the unit.
- Outside sensor.
- Supply sensor.
- Return air sensor.
- Exhaust sensor.

Notification of alarms.

Fan airflow reading (CFM).
Commands by BACnet MSTP or IP communication:

Starting the unit.

Supply temperature setpoint (°F/°C).

Fan airflow setpoint (CFM).