Thermo King 098916, Maintenance Manual

Page: 86 / 196

Operating Instructions
85
Advanced Fresh Air
Management (AFAM) System
(Optional)
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 MP-3000a
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 72 hours
(in 1 hour increments). This allows faster product
temperature pull-down.
AFAM Operation
The system is pre-calibrated for air exchange rates
of 0 to 280 m
3 /hr. (0 to 165 ft 3 /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.
1. Vent Door
2. Door Control Module
3. Interface Board and Cable (mounts in Control Box)
4. Grille
Figure 45: AFAM System
AXA0250
1
2
3
4