12-15
CONTROL SYSTEM
Revision Y05-01
Service Manual - WMZ
12.7
Automatic Cooling or Heating
12.7.1
Automatic Cooling or Heating - General
•
Switching-temperature between Cooling and Heating is SPT
±
3
o
c.
•
Autofan in Automatic Cooling and Heating Mode will activate “Cooling
with Autofan Mode” and “Heating with Autofan Mode” respectively.
•
When the Auto Mode is started with SPT +/-0
o
c, the unit will not select
Auto Heat or Auto Cool mode immediately. Instead, the unit will be in
a temporary Fan Mode with IFAN operating at low speed.
The proper Auto Heat mode or Auto Cool will be started whenever the RT
reaches
SPT-1
o
c or SPT+1
o
c respectively.
•
For RC & SH units, Mode change between Auto Heat & Auto Cool
Modes is possible only after the COMP has been OFF during the
last T minutes.
Mode Change
time, T
Auto Cool to Auto Heat
3 min
Auto Heat to Auto Cool
4 min
•
When unit is changed form Cool/Dry mode to Auto Mode, the unit
will continue to operate at (Auto) Cool Mode until the conditions for
switching from Auto Cool to Auto Heat are satisfied.
Similarly, when unit is changed from Heat Mode to Auto Mode, the
unit will continue to operate at (Auto) Heat Mode until the conditions
for switching from Auto Heat to Auto Cool are satisfied.
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