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temperature, and the display temperature is
(For DW-86L100J: After unlocking the display board, long press the combination button of "Up" + "Down" for
5s, enter the unlocking password (which is 16 by default and is adjustable within 00~99) of after-sales/factory
parameter level, press the "Setting" button to confirm the unlocking, and set the parameters of after-sales and factory
after unlocking. After entering the after-sales/factory parameter level, press the "Up" or "Down" button to select the
Ct parameter, and then press the "Set" button to modify the parameter value;
Ct: For pt100 main sensor temperature calibration, the default value is 0, the calibration range is ±10°C, and the
adjustment step is 1; press the "Up" or "Down" button to modify the setting value of pt100 temperature calibration;)
9.6 Control of condenser fan:
When the compressor is turned on, the two fans are turned on; when the two compressors are turned on, the two
fans shall be turned on or off according to the following conditions: when the ambient temperature is higher than
20°C, the two fans are turned on; when the ambient temperature is lower than 20°C (excluding 20°C), one fan is
turned on, the other is turned off; when the ambient temperature is lower than 12°C (excluding 12°C), both the fans
are turned off.
9.7 Remote alarm function
Remote alarm function is required to have normally open alarm and normally closed alarm function, which can
be selected according to the needs. In case of high temperature, low temperature and external power failure (no
matter whether the back-up battery switch is on or not), the remote alarm function is started.
9.8 Control of compressor
When it is just powered on, delay the delay time set by the user (the default time is 1 minute). If the start-up
conditions are met, start the high temperature compressor and delay for 10 minutes from the start-up of the high
temperature compressor; if the temperature of the heat exchanger sensor is lower than -20°C (including -20 °C), the
low temperature compressor will be turned on.
When the compressor starts and stops normally, if the start-up conditions are met, start the high temperature
compressor, if the temperature of the heat exchanger sensor is lower than -20°C (including -20°C) after 1 min, the
low temperature compressor will be turned on.
When the compressor is in normal operation (start and stop), the start-up time of the compressor is not less than 10
min and the shutdown time is not less than 5 min. 。
If the shutdown conditions are met, the output terminals of low temperature compressor and high temperature
compressor have no output.
In the operation of 3.2.1, when -40°C is selected: except that the judgment condition for starting the low temperature
compressor is changed to 5°C (30°C for shutdown), the others are the same as those at -86°C.
When the strong current is firstly applied, if the low temperature compressor (continuously) works for 16 hours, the
compressor is forced to shut down for 10 minutes, and then automatically resumes operation. In other times, execute
as below: the low temperature compressor is forced to shut down for 10 minutes after 5 hours' continuous operation,
and then automatically resumes operation.
9.9 Voltage calibration
Operation function on the display board is added for voltage calibration. The specific operation procedures are
ULT Energy-saving Series
After-sales Service Manual
38
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