Johnson Controls YVAHP0721CW Series, Service Manual

Page: 386 / 416

5-26
SM-16007
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING
(12) Intermittent Operation of Outdoor Fan Motor (Function Setting “F4”)
Press “PSW3” and set Intermittent Operation of Outdoor Fan Motor “
” (auxiliary function) to protect the
outdoor fan motor from snow.
Set this function to the PCB of the outdoor unit A (main outdoor unit).
When the outdoor temperature (selectable from 38
o
F (3
o
C), 32
o
F (0
o
C), 34
o
F (1
o
C), 36
o
F (2
o
C), 40
o
F (4
o
C)
and 41
o
F (5
o
C)) reaches the temperature setpoint, all the outdoor fan motors start intermitted operation.
When the outdoor temperature is at least +9
o
F (+5
o
C) higher than the temperature setpoint, the outdoor fan
motors stop operating.
If the compressor restarts operating, the outdoor fan motors will be restored to normal operation.
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 the outdoor fan motor start/stop operation, stop all the outdoor
fans to suspend the operation. Check the alarm code and deal properly with the failure next time the
compressor is operated.
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.
"Fd" Setting Condition Unit
1 Temperature:
o
F, Pressure: psi (Default Setting)
2 Temperature:
o
C, Pressure: MPa
(13) Temperature and Pressure Unit Setting (Function Setting “Fd”)
Press “PSW3” and set Temperature and Pressure Unit “
” to change the unit setting of temperature and
pressure.
Fan Motor Operation
30 [s]
Fan Motor Stop
600 [s]