19
Table 8. Service Parameters
Screen/Button
Display
Function
Summary
1
Initial Screen
SEr -30
Temp of the unit
Allows the user to see what temperature
the unit is designed to run.
Varies
CPU Checksum
Shows the current checksum of the CPU
board for validation.
Varies
Relay Board Checksum
Shows the current checksum of the Relay
board for validation.
tyP
Model Type
Unit type 30 for -30 Freezer. This
parameter should never be changed.
2
Press Scan (
SCAN
)
CFg
Type of unit
This parameter should only be changed by trained
service personnel.
3
Press Scan (
SCAN
)
CuFt
Size of the unit
Setting for size of the unit.
4
Press Scan (
SCAN
)
Pd oFSt
Control Probe
Pulldown Offset
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 todoor
openings.
5.
Press Scan (
SCAN
)
Cnt oFSt
Control Probe
Offset
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.
6
Press Scan (
SCAN
)
dIS oFSt
Display Probe
Offset
The difference in temperature between the display
probe value seen on the User Interface display and
the average compartment temperature at the unit
setpoint during steady state operation. This
can be useful to adjust the display during
unit calibration procedures.
7
Press Scan (
SCAN
)
Ctr CAl
Display Control Probe with
Offset
(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.
8
Press Scan (
SCAN
)
Cnt ucl
Control Upper Hysteresis
The degree increase in temperature from
the setpoint that will trigger the unit to
begin cooling to prevent the unit from
getting too warm.
