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BUS Control Panel
(continued)
Configure Optional Back Up
System (BUS)
Set Optional BUS Set
Thermo Scientific
For Hysteresis & Dual probe fault mode settings (Figure 6-7), locate
Jumper J17 near to solenoid/ sensor connector (J1), refer to table below
for operation details:
Jumper PIN
Status
Short Together/ Jumper Cap
J17 PIN 1 & PIN 2
Installed
J17 PIN 1 & PIN 2 Open/No-Jumper Installed
Table 6-2. Probe Fault Mode Settitng
The optional BUS can be configured for LN
Configuration contains instructions for setting the BUS type.
The optional back up system is designed to inject CO2 or LN2 into the
freezer compartment if the temperature rises above back up system set
Point
point. To set the BUS set point:
1. Press the Mode key until the Settings indicator lights.
2. Press right arrow until "BACKUP = -XX" displays in message center.
3. Press up or down arrow key until desired BUS set point is displayed.
4. Press Enter to save the setting.
5. Press the Mode key until the Run indicator lights, or press the right or
left arrow to go to the next or previous parameter.
If no control keys are pressed, the freezer will automatically return to
RUN mode after 5 minutes.
Warning Changing operating temp set point can affect BUS set point.
BUS set point self adjusts to maintain a temp of at least 10°C above the
operating temp set point.
Note The BUS set point cannot be set any colder than the high
temperature alarm set point. (See Section 1 - Setting the High
Temperature Alarm). If the back-up system is installed with CO
65°C is the coldest BUS set point that can be used (if the cabinet set point
is -75°C or colder).
Hysteresis
5°C
9°C
s
s
Factory Installed Options
Dual Probe Fault Mode
Non-PWM Mode
PWM Mode
or CO
supply. Section 3 -
2
2
, then -
2
TSC Series
Section 6
6-7
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