Service manual

11-18
CONTROL SYSTEM
Revision Y06-02 Service Manual - KN Series
11.10 Automatic Cooling or Heating
11.10.1 Automatic Cooling or Heating - General
The AUTO Mode is for models with compressor and the WVL-RH only. The WVL-ST,
RC and SH units do not work in AUTO Mode.
a. Mode Definition
Mode: AUTO
Temp: Selected desired temperature
Fan: Any
Timer: Any
I-FEEL: ON or OFF
b. Switching-temperature between Cooling and Heating is SPT r 3
O
C.
c. 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.
d. 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
e. For RH and WVL-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
f. When unit is changed form Cool/Dry Mode to Auto Mode, the unit will continue to
operate in (Auto) Cool Mode until the conditions for switching from Auto Cool to
Auto Heat are satisfied.
Similarly, when unit is changed fro
m Heat Mode to Auto Mode, the unit will
continue to operate in (Auto) Heat Mode until the conditions for switching from
Auto Heat to Auto Cool are satisfied.
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