Hisense AS-07UR4SYDDB15, Service Manual, Page: 57 / 59

83
protective
The failure is detected when the room temperature sensor broken or shorted over 5 sec.
The failure is detected when the temperature sensor of heater exchange broken or shorted over 5 sec.
The failure is detected when each setting data is not match after the EEPPOM self-check two times.
The failure is occur when the grounding signal is not detected after the appliance power ON.
7-­‐2. Test the jumper terminals
Note:
When the whole machine is powered up, if the external unit does not work, to rule out the
communications failures, adopt screening method such as short circuit on the jumper terminals to see if
the external unit can be started normally or similar method.
There are two blue terminals on the outdoor control panel, as shown above.
Application: Short out the terminals, and power up the outdoor unit, then the outdoor unit may run
independently. It can be determined that there is no internal and external communication faults.
When the environment temperature is lower than 18
℃
, you can't run the unit under the cool mode, but if you
need run the unit at this monnent ,such as add the gas or do mose test,
at this moment you can use this function,
Umder this function, the outdoor motor and compressor will be forced to run until reaching a fixed frequenency
(general is 50~55Hz).
7-­‐3. Trouble Diagnosis of Protection
Protection diagnosis of the complete machine (all types of protection during operation, i.e.
under-voltage, over-voltage and overcurrent protection)
Note: List all types of protection that may occur to the complete machine and describe the conditions
and signs of the start, course and end of such protection.
Voltage protection
Protection against AC input over-voltage/under-voltage
1.Conditions for protection against AC input over-voltage/under-voltage:
If the input AC voltage is greater than “protective over-voltage value” or less than “protective
under-voltage value” for five seconds, over-voltage/under-voltage protection tarts.
2.Protection actions against AC input over-voltage/under-voltage
The system stops operation.
3. Conditions for ending AC input over-voltage/under-voltage:
If the input AC voltage is lower than “the protective over-voltage value” -10V, or higher than “the
protective under-voltage value” +10V, the over-voltage/under-voltage protection will be released.