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Fig. 4: the indoor PCB
Please test the DC motor
end to N terminal voltage
value: VCC-N +15VDC、 P-N
+340VDC、Vsp -N 0～+5VDC
Fig. 5：the outdoor PCB
Malfunction code：F2 （the indoor temp sensor fault）
Note：the above parameter is tested when there is the power in the PCB, so is the following 。
The voltage stabilizing diode ZD1 、
ZD2 reference value：
Forward resisitance :713 Ω
resistance:∞
Turn off the power
Take out the temperature sensor from the indoor PCB,
then check whether the indoor temperature sensor's
resistance
is
normal.(the
range
resistance :1~40 KΩ)
Connect the sensor renewedly to the indoor PCB,，then
check the resistance between the sensor and indoor
PCB terminal. The normal resistance value is 0Ω
The indoor PCB is bad，please change it
reverse
Faulty cause ： 1 、 maybe the indoor temp sensor ' s
bnc connector plugs is loose or contact ill;
2 、 the sensor is bad or
circuit-break 、 circuit － short
3 、 the indoor PCB ' s hardware has been damaged
N
of
normal
Y
Y
48
PTC1 resistance value：
1．02KΩ（25℃）
The
resistance value ： R54 ：
0.76kΩ R58： 2 kΩ
the down-lead is
Please replace it .when the indoor
temperature sensor has problem.
N
The indoor temperature sensor adapter
connector breaks off, pls replace the
indoor PCB or restore the adapter
connector.
limited
current
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