Thermo Scientific TSX Series Installation And Operation Manual page 29

Table 8: Service Parameters
Screen/Button
1 Initial Screen
2 Press Scan (
3 Press Scan (
4 Press Scan (
5 Press Scan (
6 Press Scan (
7 Press Scan (
8 Press Scan (
Thermo Scientific
Display Function
SEr -20 Temp of unit
Varies CPU Checksum
Relay Board
Varies
Checksum
tyP Model Type
)
CFg Type of unit
)
CuFt Size of the unit
Control Probe
) Pd oFSt
Pulldown Offset
Control Probe
) Cnt oFSt
Offset
Display Probe
) dIS oFSt
Offset
Display Control
Probe with Offset
) Ctr CAl
Control Upper
) Cnt ucl
Hysteresis
Summary
Allows the user to see what temperature the unit is
designed to run.
Shows the current checksum of the CPU board for
validation.
Shows the current checksum of the Relay board for
validation.
Unit type 20 for -20 Freezer. This parameter should
never be changed.
This parameter should only be changed by trained
service personnel.
Setting for Size of the unit.
The difference in temperature between the control
probe value and the average compartment
temperature that determines when the control system
changes from pull down mode to steady state
operation. This can be useful to adjust if the average
compartment temperature has an undershoot or
overshoot relative to setpoint during pull down mode.
This offset is also used on some freezer
models as a response to door openings.
The difference in temperature between the control
probe value and the average compartment
temperature that is used to control the cooling system
to the unit setpoint during steady state operation. This
can be useful to adjust if there is a discrepancy
between the unit setpoint and the average cabinet
temperature.
The difference in temperature between the display
probe value seen on the User Interface display and
the average compartment temperature at the unit set-
point during steady state operation. This can be
useful to adjust the display during unit calibration
procedures.
(If present)
Normally OFF (00). If ON (01), the Upper Bottle
Temperature output on main display is replaced by
the control probe temperature value with offset when
exiting the service menu.
The degree increase in temperature from the setpoint
that will trigger the unit to begin cooling to prevent
the unit from getting too warm.
TSX -20°C Flammable Materials Storage Laboratory Freezers
Operation
25