VICI FTP - Manual (Page 15)

11
Fan Installation and Modes
Installation
1. Before turning on the fan, verify that the power to the column is off (Z-<enter>), to
prevent column damage.
2. To test the connections, turn on the fan by typing F+<enter>. If it does not come on,
check the connections and/or replace the fan.
3. Turn off the fan by typing F-<enter>.
Mode Descriptions
The cooling fan has four modes:
0 Off
1 The fan is always on. (This will generally never be used.)
(default) 2 The fan cuts off when it has reached a preset temperature above
the state 1 temperature. (Refer to the section on page 10 entitled
To View or Change the Drop Out Temperature.)
3 The fan is on for a length of time set by the user.
4 The fan remains on in state 1.
The fan turns on automatically after the last state hold time is completed as long as the
fan is in mode 2 or 3. In mode 2, the fan cools the column until it reaches 1-2° above the
state 1 idle temperature (drop out). The column temperature will continue to fall and
the controller will automatically power up the column as necessary to “idle” at the state 1
temperature. Fan mode 2 is the default mode, and is recommended for most applications.
In fan mode 3, the fan will come on for the designated amount of time—30 seconds, for
example—after which it cuts off.
In mode 3, if the fan is on too long and the state 1 temperature
is too high, current will be applied to maintain the state 1
temperature at the same time the fan is attempting to cool
the column. This may potentially damage the column. For this
reason, we recommend fan mode 2 for most applications.
In mode 4, the fan remains on in state 1 to allow a lower starting temperature.
NOTE: Since we are unable to electrically reverse the heating process, controlled ramping
from a higher to a lower temperature is not possible.