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Heat Recovery Wheel Control Systems

You can control HRW systems with individual DDC units or by building control systems.

Wheel Control (Speed Control Signal by Others)

On/Off Control
Rotor will receive power and will operate when the main disconnect is turned on. A modulating signal is required to control the Rotor speed. The controller can be set up for the following input signals: (0-5V, 0-10V, 1-5V, 2-10V, 5-10V, 10-0V, 10-2V, 10-5V, 0-20V Phase cut, 0-20mA, and 4-20mA). The Rotor can be turned on and off remotely by removing white jumper from terminals #5 and #6 in wheel speed control panel and connecting remote switch as indicated.

Rotation Detection and Alarm
A magnet fitted to the periphery of the rotor actuates a pulse sensor once every revolution. Under normal operation the internal contacts are in the energized position (contact closed between #15 and #13). If the drive belt should fail or if the drive stops, after 20 minutes the internal contacts shall close between #15 common and #14 NC), sending a signal to a remote alarm furnished by others.

Automatic Purge
When wheel is at minimum signal or zero recovery, the wheel will automatically run at minimum speed for 10 seconds every 30 minutes to ensure that the rotor surface is kept clean.

Gentle Starting
The control unit soft-starts the wheel, taking approximately 30 seconds to ramp up the wheel to maximum speed. This extends the life of the drive and belt.


Maximum Discharge Temperature Speed Control
The remote modulating signal shall modulate the speed of the rotor to maintain a maximum Supply Air discharge temperature leaving the Rotor (T-SA). As T-SA rises above the recommended setpoint of 58 F, rotor speed is reduced to decrease rotor effectiveness. If T-SA is below setpoint, the rotor runs at maximum speed with maximum recovery.

Summer Mode Control
When the Outside Air temperature (T-OA) rises above the return air temperature (T-RA), the rotor should be run at maximum speed for maximum recovery.

Frost Control
When the exhaust temperature (T-EA) leaving the AIRotor falls below the recommended setpoint of 15oF, the rotor speed is reduced to reduce heat recovery and maintain a minimum exhaust temperature



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