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5 Control System
Control for auto cool/heat operation
5
Prevention control for high pressure increase
This function is performed to prevent the abnormal condition (Alarm: 02) when the outdoor air flow is decreased by a sea-
sonal wind against air outlet.
When the CMC is ON during cooling operation, PSC is ON and Tc is higher than Tc1+4°C, forced thermo-off operation will
be performed.
Tc: Outdoor piping temperature
Tc1: Outdoor piping temperature when PSC is ON
PSC ON: 3.60 MPa
However, if it occurs more than 6 times during operation, forced thermo-off operation will not be performed. Cause of stop-
page will be 13.
159
SMGB0064 rev.0 - 08/2011
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Troubleshooting
