Toshiba A03-009, Service Manual

Page: 32 / 219

31
5
Fan speed
control 1. The fan operates in one of the four speed modes of “HIGH (HH)”, “MED (H)”,
“LOW (L)” and “AUTO” on the basis of a command issued via the remote
controller. (Concealed duct high static pressure type: HH only)
2. In AUTO fan speed mode, the air speed changes according to the difference
between Ta and Ts.
<Cooling>
HH > H+ > H >
L+ > L > UL
or LL
• Control is identical in remote controller thermo and body thermo operation.
Speed modes shown in < > apply to cooling operation under AUTO air
conditioner operation mode.
• In AUTO fan speed mode, the fan speed remains the same for 3 minutes each
time a speed change occurs.
However, a speed change command issued via the remote controller can
override this, and the fan speed changes accordingly.
• At the beginning of cooling operation, a higher speed (steeper downward
temperature gradient) is chosen.
• As long as the temperature difference remains on a boundary line, the fan speed
stays the same.
<Heating>
Figures inside ( ) applies to remote controller thermo operation.
Figures outside ( ) applies to body thermo operation.
Speed modes shown in < > apply to heating operation under AUTO air
conditioner operation mode.
DN code “32”
“0000”: Body thermo
“0001”: Remote
controller thermo
• In AUTO fan speed mode, the fan speed remains the same for 1 minute each
time a speed change occurs.
However, a speed change command issued via the remote controller can
override this, and the fan speed changes accordingly.
• At the beginning of heating operation, a higher speed (steeper upward
temperature gradient) is chosen.
• As long as the temperature difference remains on a boundary line, the fan speed
stays the same.
• When TC2 60 °C, the fan speed is raised by one step.
TC2: Indoor heat
exchanger sensor
temperature
3. If the air conditioner goes thermo OFF during heating operation, the fan speed
drops down to LL (breeze).
“HEATING
STANDBY
”
displayed
NO. Item Specification outline Remarks