Battery Control Requirements; Adjustment Method Of Temperature Drift - Haier DW-86L338J Service Manual

(5) The setting methods of high temperature alarm and low temperature alarm are the same as that of temperature in
the freezer.

9.4 Battery control requirements:

There is a battery power switch on the equipment, which should be turned on before normal startup. As long as
the AC power supply meeting the requirements of the equipment is connected, the equipment will enter into normal
working state. When the AC power supply is normal, the equipment can charge the battery according to the
requirements. The specific requirements are as follows:
1. If the battery voltage U = 0 (it indicates that the battery switch is not turned on) is detected when the strong
current is applied, the battery will not be charged at this time, and the low battery alarm will be given directly: the
low battery indicator light will be on, the alarm indicator light will flash, and the buzzer will not sound. Purpose:
Remind the user to turn on the battery switch in time;
2. Detect the voltage of the battery for 5 min when the strong current is applied, if it meets the requirements of
0 < U ≤ 10.5 V, it indicates that the battery switch is turned on. At this time, charge the battery according to the
following methods: after 24 hours of continuous charging, the battery voltage is detected again for 5 min, if 0 < U ≤
10.5 V, it indicates that the battery may have been damaged, and start the low battery alarm but continue charging.
Purpose: Remind the user that the battery may be damaged and replace the battery if necessary (the alarm method is
the same as above). If it is detected that the battery voltage meets the requirements of 10.5 V < U ≤ 11.5 V after 24
hours of power on, the low battery alarm will not be given at this time, continue the procedure of charging for 24
hours and detecting of 5 minutes until the battery voltage reaches 12.5 V, after that, charging is not needed;
3. When the strong current is applied, detect the battery voltage for 5 min. If it meets the requirements of 10.5
V < U < 11.5 V, carry out the procedure of charging for 24 hours and detecting for 5 min, there is no low battery
alarm.
4. After the accidental failure of strong current, the battery shall supply power to the display screen, etc. When
the battery discharge reaches U ≤ 10.5V, the battery shall stop supplying power and the display screen shall no
longer display.
In case that the battery can supply power normally, if you want to cut off the power completely, just unplug the
AC power cord, and then turn off the battery switch on the freezer, and the display screen will not display. After the
freezer is completely powered off, the parameters set before the power off must be able to be saved. The original
setting parameters shall not be changed or lost when the freezer is turned on next time.

9.5 Adjustment method of temperature drift

In the case of unlocking, press the "Function Selection" button, and the display board will display a value,
which can be adjusted between +5°C~- 5°C, and the computer board will automatically save it after adjustment.
Example 1. The display temperature of a user's freezer is -80°C, but the temperature in the freezer measured by the
user is -70°C, and the difference between them is 10°C. In order to reduce the temperature difference between them,
the temperature drift can be adjusted by adding 5°C, at this time, the displayed temperature is -75°C, and the
temperature inside the freezer is still -70°C. As the freezer is turned on for refrigeration, the displayed temperature
and the measured temperature decrease at the same time;
Example 2. The display temperature of a user's freezer is -80°C, and the temperature of the freezer cannot reach a
lower temperature because the user's ambient temperature is too high, but the user requires that the display
temperature must be -82°C, at this time, the temperature drift can be adjusted by deducting 2°C. Display
ULT Energy-saving Series After-sales Service Manual
37