4.6 Sentry II Temperature Control Lock and Unlock Features
The temperature control is equipped with a locking feature to prevent unauthorized adjustments to the
calibration, temperature set points, and unit of measure.
Unlock - To unlock the temperature control for adjustment, press and hold the ▲ and ▼ keys (see
Figure 25) simultaneously for two seconds. When released the display will blink once indicating a
successful unlock, otherwise repeat the process.
Lock - To lock the temperature control, press and hold the and ▲ keys simultaneously for 4
seconds. When released the display will blink once indicating a successful lock, otherwise repeat the
process. To validate a locked condition, press the key once, when released the display will
momentarily display “Lock.”
NOTE: The temperature control should be locked during normal operating conditions to prevent
unauthorized or accidental setting alterations.
Figure 25 - Sentry II Temperature Control
4.7 Sentry II Temperature Control Calibration
1. Unlock the temperature control as instructed in Section 4.6.
2. Press and hold the key until the display stops blinking, then release.
3. The display will show SHIF alternating with the current calibration setting.
NOTE: If display reverts to temperature, repeat step 2.
4. Press and release either the ▲ or ▼ key, the display will show 3 digits and 1 decimal (000.0).
5. Press and release either the ▲ or ▼ key to cycle to the decimal point or digit you wish to change.
The selected digit will be highlighted. EXAMPLE: 000.0
6. Adjust the temperature calibration offset for the digit selected in step 5, by pressing and holding
the ▲ key to increase, or the ▼ key to decrease. Example: 001.0
7. NOTE: For a negative calibration offset, select the first digit (X00.0) then press and hold the ▼ key
until – negative is displayed (–00.0). If –100.0 is displayed, press the ▲ key until –00.0 is
displayed. EXAMPLE: –01.0
8. Press the key once to enter the change.
28
Factory Temperature Control Settings:
Refrigeration On - 39°F (3.9°C)
Programmed Set Point
- 38°F (3.3°C)
Refrigeration Off - 37°F (2.8°C)
Temperature Alarms:
High Alarm - 41°F (5.0°C)
Low Alarm - 35°F (1.7°C)
See Section 4.8.
Sentry II with Water Works Box Operating Instructions Effective April 1, 2000
Part No. 8823728 Revised November 10, 2003
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