Advanced Fresh Air Management (AFAM) System
An advanced microprocessor controlled fresh air management system provides programmable control of air exchange rate, programmable delayed vent opening, automatic closure of air exchange vent during low ambient conditions, and data logging of air exchange rate and vent opening delay interval.
The AFAM system includes a door control module, vent door and vent grille. The controller sends a communication signal to the door control module to position vent door to desired position. The controller can also be set to delay opening of fresh air vent for up to 48 hours (in 1 hour increments). This allows faster product temperature pull-down. Refer to (Starting the AFAM System) for more information.
AFAM Operation
The system is pre-calibrated for air exchange rates of 0 to 225 m3/hr. (0 to 132 ft3/min.). The actual door position is based on the air exchange setting and the power supply frequency.
If the controller identifies a component failure during unit startup, an alarm is recorded in the controller display and data-logger memory. If a power loss occurs after the AFAM system is turned on, the controller automatically operates the vent door based on the previous AFAM Delay and AFAM Rate settings when power is restored.
AFAM Vent Door Assembly
- Caution
- Risk of Injury
- After installing or servicing the AFAM door, remove all tools and install the vent grille before starting the AFAM system. Failure to replace the vent grille before turning the AFAM system on may result in personal injury or unit damage.
A microprocessor controlled vent door provides programmable control of the air exchange rate. The vent door is adjusted to the desired position by a vent door motor and linkage assembly (See figure below). The system is pre-calibrated for air exchange rates of 0 to 225 m3/hr. (0 to 132 ft3/min.). The use of the AFAM system should be established by the shipper.
The default setting for AFAM in the Setpoint menu is the last value set (Off, AFAM). The Fresh Air Vent Man submenu should be set to AFAM to control the vent door to the fresh air exchange rate setting.
If the controller identifies a component failure during unit startup, an alarm is recorded in the controller display and data-logger memory. If a power loss occurs after the AFAM system is turned on, the controller automatically operates the vent door based on the previous AFAM Delay and AFAM Rate settings when power is restored.
