Control Of Balance Hole Heating Wire; Control Of Capillary Tube Heating Wire (Cancel Capillary Tube Heating Wire After November 2016); Computer Board Power Failure Alarm; Perspective View And Pan View Of Refrigeration Cycle - Haier DW-86L338J Service Manual

Press "Up" or "Down" button to modify the setting value of door opening alarm delay;)

9.13 Control of balance hole heating wire

When the temperature in the freezer is higher than -35°C, the heating wire at the balance hole dose not heat;
when the temperature in the freezer is lower than -35°C (including -35°C), the heating wire at the balance hole is
connected for heating. The heating wire of the balance hole is powered by DC 12 V output from the computer board.

9.14 Control of capillary tube heating wire (Cancel capillary tube heating wire after November 2016)

Capillary tube heating includes automatic heating mode and manual heating mode. Manual forced heating is
mainly used for maintenance and inspection, which is not allowed to be operated by users. Forced heating is mainly
used for oil blockage fault during temperature rise of the system, and the specific operations are as follows: in
unlocking state, press "Up + Down" buttons simultaneously for 5 seconds to enter the forced heating procedure of
capillary tube, at this time, the compressor is forced to stop, and at the same time, "H" is long displayed on the
rightmost digital tube of the original freezer temperature display area on the display board, after a delay of 3 min,
the capillary tube heating wire is switched on to start heating, heating is completed after a forced heating time of 10
min, then the compressor starts up by normal procedure after a delay of 3 min, while the freezer temperature display
restores the display of the freezer temperature. The forced heating procedure is completed.

9.15 Computer board power failure alarm

In case of switching power supply damage due to output short circuit of the isolation transformer winding of
the switching power supply, and there is no +12 V output, the freezer temperature display area will immediately
flashing display EEE, the alarm indicator light will flash synchronously, and the buzzer will give an alarm.
X. Perspective view and pan view of refrigeration cycle

10.1 Refrigeration principle

The ULT Freezer adopts cascade refrigeration system that is usually composed of two or more refrigeration systems,
which are called high temperature stage system part and low temperature stage system part respectively. High
temperature stage system uses medium temperature refrigerant, and low temperature stage system uses low
temperature refrigerant. Each part is a complete refrigeration system. The two parts are connected by a condensing
evaporator, which is both the evaporator of high temperature stage system and the condenser of low temperature
stage system. The low temperature refrigerant absorbs the heat of the object to be cooled in the evaporator of the low
temperature stage system, and transfers the heat to the refrigerant of the high temperature stage system through the
condensing evaporator, and then the heat is transferred to the cooling medium in the condenser of the high
temperature stage system by the refrigerant of the high temperature stage system.

10.2 Perspective view and pan view of refrigeration cycle

ULT Energy-saving Series After-sales Service Manual
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