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(3): Defrost operation for 9 minutes contineously.
E. If the quit condition can be met, the unit will perform:
Compressor stops, and outdoor motor runs. 50 seconds later the 4-way valve is close, then 60
seconds later, compressor will perform as startup procedure.
F. In defrosting period and in 6 minutes after defrosting, the low pressure is shielded.
7.2.6 PTC output control
z When outdoor unit is electrified, PTC output is 0, 10 seconds later, it is 1.
z After compressor stops for 10 minutes contineously, PTC output is 0.
z When getting the compressor-start signal, firstly PTC output is 1, 5 seconds later,
compressor will start up.
7.2.7 Electric heater control
When shutoff, the electric heater will be controlled by the ambient temperature: below 20ć,
working; over 26ć, stop.
When the unit switched on, electric heater will not work.
7.2.8 Time shorting function, auto-checking function
Time shorting function: If the time shorting port is in short circuit, the unit will perform a 1/60 time
shorting control.
Auto-checking function: When first short-circuit then electrified, enter auto-checking, steps:
failure LED 1-5, EEV, electric herter, oxygen bar, 4-way valve, low speed –high speed wind.
7.2.9 Additional functions
7.2.9.1 The interval between compressor stop to startup again is 3 minutes, which can protection
compressor. If being electrified for the first time, compressor will start up only when the valve opens
to the normal operation angle.
7.2.9.2 TD high temperature protection
As long as the unit is running, the TD discharging overheat protection will work, but the
discharging sensor failure will alarm 4 minutes later after compressor starts up.
Measure sensor value: measure for 100 times (The program performs for one period needs 5
ms, every time the system will take samples for 8 times, and make an order for them, taking out 2
average values in the middle, and make an average value.).
TD˄ć˅ Abnormal stop
117
quick reduce FQY(1HZ/s)
112
slow reduce FQY(1HZ/10s)
108
FQY no change
105
rise FQY(1HZ/10s)
98
rise FQY(1HZ/1s)
TD>117ć and keeps for 20 seconds, discharging temperature over high protection will work,
the unit will stop and alarm(outdoor indicates, not sending to indoor). the TD overhigh protection
occurs 3 times, the unit will stop and alarm (sending to indoor), it can not resume automatically.
7.2.9.3 In heating indoor TC high temperature protection
Indoor heat exchanger temperature will check the indoor coil temperature, if it is over 55ć, the
unit will reduce the compressor motor speed to perform the indoor heat exchanger temperature
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