SM-16007
5-9
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING
• Setting Example
Outdoor Fan Motor Start/Stop at Input 2 (between 2 and 3 pins of CN17)
(3)
Input
Outdoor Fan Motor Start/Stop (Control Function No.4)
This is an auxiliary function to protect the outdoor unit from snow. When the input terminals for Outdoor
Fan Motor Start/Stop on the outdoor unit PCB are short-circuited during the compressor stoppage, all the
outdoor fan motors start operating. If the compressor restarts operating, the outdoor fan motors will be
restored to normal operation. If the input terminals of Outdoor Fan Motor Start/Stop are opened during the
outdoor fan motor operation following the short circuit of these terminals, the outdoor fan motor will stop.
This function is possible only during the compressor stoppage (during Switch-OFF or Thermo-OFF of the
Switch-ON). Therefore, this function will not be possible even if the input signal is sent during the normal
cooling or heating operation.
An example of basic wiring when the Outdoor Fan Motor Start/Stop (Input 2) is set to 2 and 3 pins of CN17
by an external signal is shown below.
NOTES:
1. This is an auxiliary function to protect the unit from snow. In snowy regions, make sure to protect the
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abnormal vibrations because of an imbalanced propeller fan will be caused.
2. If the fan motor or fan controller fail during this function, stop all the outdoor fans to suspend this
function. Check the alarm code and deal properly with the failure next time the compressor is operated.
3. When setting the snow sensor switch for Outdoor Fan Motor Start/Stop, make sure that the continuous
operating time is 30 seconds or more. Also Outdoor Fan Motor Start/Stop intervals shall be at least 10
minutes. Otherwise, malfunction of the outdoor fan motors will be caused by frequent starts and stops.
*Switch-ON: Some indoor units are running or staying.
Switch-OFF: All indoor units are stopped.
Because of this setting, the outdoor fan can operate even while the outdoor unit (compressor) stops.
Display a notice to that effect on a readily visible part of the unit body, in order to avoid injuries
caused by an unintended outdoor fan operation.
X1: Auxiliary
Relay
SS3: Snow Sensor Switch
Control Circuit
X1
2
3
1
2
3
3P Connector
Outdoor Unit
PCB
CN17
SS3
Power
Source
X1
Wiring Diagram Example of Outdoor Fan Motor Start/Stop
Summary of Contents for YVAHP0721CW Series
Page 2: ......
Page 10: ...viii SM 16007 ...
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Page 15: ...SM 16007 1 1 INSTALLATION 1 Installation ...
Page 163: ...SM 16007 2 1 OPERATION 2 Operation ...
Page 164: ...2 2 SM 16007 OPERATION Ɣ 5HIHU WR WKH 6HUYLFH 0DQXDO IRU QGRRU 8QLW RU RQWUROOHU ...
Page 165: ...SM 16007 3 1 TROUBLESHOOTING 3 Troubleshooting ...
Page 284: ......
Page 285: ...SM 16007 4 1 MAINTENANCE 4 Maintenance ...
Page 360: ......
Page 390: ......
Page 391: ...SM 16007 6 1 FIELD WORK INSTRUCTIONS 6 Field Work Instructions ...
Page 400: ...6 10 SM 16007 FIELD WORK INSTRUCTIONS 0ROOLHU KDUW IRU 5 ft 3 l b ...
Page 401: ...SERVICE PARTS LIST SM 16007 7 1 7 Service Parts List ...
Page 416: ... 2016 Johnson Controls Inc SM 16007 Code No LIT 12012400 Issued November 2016 ...