Main Protection; Operation Modes And Functions - York Pyrenees YM9FXC030BAA FX Series Service Manual

7.3 Main Protection

7.3.1 Time Delay at restart for compressor.
7.3.2 Sensor protection at open circuit and
breaking disconnection.
7.3.3 Zero crossing detection error
protection
If AC can not detect zero crossing signal for 4
minutes or the zero crossing signal time interval
is not correct, the unit will stop and the LED will
display the failure. The correct zero crossing
signal time interval should be between 6-13ms.
7.3.4 Fan Speed is out of control
When Indoor Fan Speed is too low(lower than
300RPM) lasting 2 minutes, the unit stops and
LED displays failure information and can't
returns to normal operation automatically.
7.3.5 Current protection
The current exceeds setting value for certain
time, the compressor and outdoor fan will shut
off.

7.4 Operation Modes and Functions

7.4.1 Fan mode
(1) Outdoor fan and compressor stop.
(2) Temperature setting function is disabled,
and no setting temperature is displayed.
(3) Indoor fan can be set to high/med/low/auto.
(4) The louver operates the same as in cooling
mode.
(5) Auto fan:
A
B
C
Resume
High
Medium
7.4.2 Cooling Mode
7.4.2.1 Compressor running rules
When indoor room temp.T1 is lower than
setting value, the compressor and outdoor fan
will shut off.
T1
On
Off
7.4.2.2 Outdoor fan running rules
The On-off outdoor units have single fan speed.
The outdoor fan
compressor except when AC is in evaporator
high temp. protection
mode ,condenser high temp. protection in
cooling mode, defrosting mode and the current
protection.
7.4.2.3 Indoor fan running rules
In cooling mode, indoor fan runs all the time
and the speed can be selected as high,
medium, low and auto.
The auto fan:
Low
will run following
in heating
the