Thermo King 098916, Maintenance Manual

Page: 90 / 196

Operating Instructions
89
Advanced Fresh Air
Management Plus (AFAM+)
System
An advanced microprocessor controlled fresh air
management system that provides:
• programmable control of the CO
2
level in the
container
• data logging of the CO
2
gas level reading
• gas sensor unit
• sensor filter
• vent loop
The controller can be set to control the CO
2
level
in the container from 0 to 25 percent.
Set AFAM+ System Values
The AFAM option submenu in the Configuration
menu is factory set to AFAM+. The controller
then adds the AFAM, AFAM Delay, AFAM Rate,
and CO
2
Max submenus to the Setpoint menu. If a
replacement controller or new software is
installed, a controller auto configuration will
detect the AFAM+ option when the AFAM door
control module and gas sensor are connected to
the controller.
• DEMAND: This setting turns on the AFAM+
system to control the CO
2
gas level. The
controller then adds CO
2
Max and AFAM
Delay submenus to the Setpoint display.
The default setting for AFAM in the Setpoint
menu is the last value set (Off, Units, Demand or
manual). AFAM must be set to Demand to control
the vent door to the CO
2
gas level.
Change the AFAM Delay
NOTE: The fresh air exchange time delay
should be established by the shipper.
The AFAM delay setting keeps the fresh air vent
closed for a preset time when the unit starts. This
allows faster product temperature pull-down. The
AFAM delay can be set from 1 to 72 hours in
1-hour increments.
NOTE: During unit startup, the AFAM delay
prevents the AFAM door from opening until the
delay times out. The AFAM delay prevents the
AFAM door from opening due to the AFAM Rate
or CO
2
system settings.
1. Press the
S
ETPOINT
key. The Setpoint menu
appears with the cursor in the [TEMP SETP]
line.
2. Press the F2 or F3 key to scroll to [AFAM
DELAY] line. The current setting (“0”)
appears in the display.
3. Press the F4 key to enter a new time delay,.
An Enter Arrow appears in the menu line and
the current time delay disappears.
4. Enter (type) the new time delay in the LCD
display using the general purpose keypad (1 to
72 hours). The cursor moves to the right of the
screen as each key entry is acknowledged and
displayed.
1. Gas Sensor Assembly (Mounts in Evaporator)
2. Vent Door Assembly and Damper Motor
3.
Interface Board and Cable (Mounts in Control
Box)
Figure 49: AFAM+ System
AXA0251
1
2
3