AFAM System & AFAM+
168
Starting the AFAM System
1. Press the SETPOINT key. The Setpoint menu
appears with the cursor in the “TEMP SETP”
line.
2. Press F2 key to scroll to “AFAM” line.
3. To change the mode setting, press F4 key.
Cursor moves to end of menu line and flashes.
4. Press F2 key to toggle between “OFF”,
“DEMAND” and “UNITS”.
• Off: Vent door closes and/or remains
closed. AFAM DELAY and AFAM RATE
settings become blank (“--”). If gas sensor
unit is installed on unit, the O
2
min and
CO
2
max settings also become blank.
• Demand: Controller uses the O
2
and CO
2
gas levels to adjust the vent door position.
• Units: Controller uses the fresh air
exchange rate to adjust the vent door
position. If a gas sensor unit is installed on
the unit, control of the O
2
and CO
2
gas
levels remains off.
5. With “UNITS” in the menu line, press and
hold F4 key until cursor stops flashing.
“UNITS” now appears in display.
6. Press ESC key to exit the Setpoint screen.
Changing 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, O
2
, 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 F2 key to scroll to “AFAM DELAY”
line. The current setting (“0”) appears in the
display.
3. To enter a new time delay, press the F4 key.
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.
5. Press and hold the F4 key until the cursor
stops flashing. The new time delay is recorded
in the controller and appears in the LCD
display.
6. Press ESC key to exit the Setpoint screen.
WARNING: The vent door and motor
actuator arm move immediately when the
F4 key is pressed to turn the AFAM system
to “DEMAND”, “UNITS” or “OFF”.
Keep hands and tools away from the air
exchange system components to prevent
personal injury or unit damage.
WARNING: The vent door and motor
actuator arm move immediately again
when the a delay is entered. Keep hands
and tools away from the air exchange
system components to prevent personal
injury or unit damage.