GeneralAire ERV 3220 - Manual (Page 13)

13
Intermittent: When the selector switch is in the intermittent position the HRV or ERV will only run
when there is a call for ventilation by any control. At that time the unit will run on high speed until the
condition is satisfied.
Continuous: When the selector switch is in the continuous position the HRV or ERV will run
continuously on low speed except when there is a call for override by any control.
Off: When the selector switch is in the off position the HRV or ERV will not come on even if there’s a
call for ventilation by any control.
INTER.: Selects the exhaust air motor
CONT.: Selects both exhaust and fresh air motors
OFF: Selects the fresh air motor
+ Button: Increase the speed of the selected motor.
- Button: Decrease the speed of the selected motor.
DuoTrol
TM
balancing system
(Patent Pending Technologies)
Silent and economical... By
reducing motor speed to
balance the unit, you avoid
the noise that would be
produced by balancing
dampers.
In addition, with this
technology the unit will consume
less energy.
Mode
selector
• Intermittent
• Continuous
• Off
Balancing
control
• Intermittent
• Continuous
• Off
• Increase Speed
• Decrease Speed
Acts as a mode selector
Acts as a balancing control (see instructions)
12. Benefits of the Duotrol TM System
figure 12.1 Duotrol TM System
The Duotrol TM lets contractor set speed of the motors for balancing purposes
(Exhaust air, Fresh air and Both motors).
GeneralAire’s Duotrol TM balancing system (patent pending) is state of the art technology
simplified for quick and easy installation for the contractor’s peace of mind. The Duotrol TM
serves two purposes.