Operation; Controller Set Up (Menus) - Fisher Scientific Isotemp Plus 13-986-142A Manual

Operation

Note
The Pout display is a normal occur-
rence when power is first applied to
the controller. Press any key to
clear it.
10
The freezer is started by inserting the power switch key,
which is found in the envelope inside the unit, into the key
switch. Turn the key to the middle (set up) position. The
internal fans will start and the display will flash between
Pout and the current chamber temperature. The Pout
(power out) display indicates to the user that the con-
troller has sensed a low voltage condition. This condition
is normal during any start-up. See the Alarms section for
details on the Pout message. Press any keypad to clear
the Pout.
The compressor has a time delay prior to activation (see
hold-off menu). This is to assure the system pressure is
given time to equalize before the compressor starts. After
the delay, the compressor LED lights and the compressor
starts.
During normal operation (control mode), the freezer tem-
perature is displayed on the 4-character display. The
compressor cycles on and off to control the chamber tem-
perature between -30.0 and 0.0°C (-22.0 to 32.0°F),
selectable by the user. The temperature set point,
high and low alarm set-points, units and display offset can
be changed while the key switch is in the setup (middle)
position. These values can be viewed but not changed
with the key switch is in the alarm position. The menu
options are explained in the following sections.

Controller Set Up (Menus)

There are 6 menus to select from, each can be accessed
by pressing the Menu keypad. Pressing the Menu key-
pad once brings up the first menu, which is the tempera-
ture set point. The displays initially flash SP followed by
the last set temperature value. Pressing the Menu key-
pad again, accepts the value and displays the next menu,
units select (CF). Each menu value is entered this way.
The menus can be changed only while the key switch is
in the set up (I) position. They can be viewed but not
changed while the key switch is in the alarm enable ( )
position. The individual menus are described below.