13-18
CONTROL SYSTEM
Revision Y05-01
Service Manual - DNG Series
13.6 Automatic Cooling or Heating - General
13.6.1 The Auto Mode is for model with compressor and the WVL-RH only. The
WVL-ST, RC and SH units do not work in Auto Mode.
o Switching-temperature between Cooling and Heating is SPT r 3
o
c.
o Autofan in Automatic Cooling and Heating Mode will activate “Cooling with Autofan
Mode” and “Heating with Autofan Mode” respectively.
o 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.
o 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
o For RH units, Mode change between Auto Heat & Auto Cool Modes is possible
after the COMP/HEs have been OFF during the last T minutes.
Mode Change time, T
Auto Cool to Auto Heat COMP off for 3 min
Auto Heat to Auto Cool HEs off for 3 min
o 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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