Cool" Position; Heat" Position - Fujitsu AB12 Service Manual

6-3-3 "COOL" POSITION

(1) When using the cooling mode, set the temperature to a value lower than the current room temperature.
(2) If it is set higher than the current room temperature the unit will not enter the cooling mode and only the fan will oper-
ate.
An example for COOLING TEMPERATURE CONTROL time chart (Manual setting)
• Set temperature (Ts=Tα Correction)
Tα+0.5 C
Tα C
• Compressor
ON
OFF
• Indoor fan
ON
OFF
(a) Compressor turned OFF : T
(b) Compressor turned ON : T
(c) Compressor turned ON : T

6-3-4 "HEAT" POSITION

(1) Set the temperature higher than the current room temperature. If it is set to a lower temperature, heating will not
start.
(2) For about 3 ~ 5 minutes after the start of heating, the fan will operate very slowly, and then switch to the selected fan
setting. This period allows the indoor unit's heat exchanger to warm-up before emitting warm air.
(3) During defrosting, the OPERATION indicator lamp flashes 3 sec. ON and 1 sec. OFF, and the heating mode will be
temporarily interrupted.
An example for HEATING TEMPERATURE CONTROL time chart (Manual setting)
• Set temperature (Ts=T Correction)
β
T β +0.5 C
T C
β
27 C
ON
• Compressor
OFF
• Indoor fan SET
• speed mode S-LOW
OFF
(a) Compressor OFF : T
(b) Compressor ON : T
(c) Compressor ON : T
(b)
3~6 min.
(a)
3HT
3ST
(b)
R
R
R
(a)
(b)
3ST
20sec.
Cold air prevention
T
R
T
R
T
R
Less than 6 min.
3HT
Tα
Tα+0.5 C (In case of 3 to 6 minutes)
Tα (In case that the compressor stops more than 6 minutes)
3~6 min.
T
R
3HT
20sec.
+0.5 C
β
β
+0.5 C (When the compressor stops after less than 6min.)
β
– 69 –
(C)
T
R
3HT 3HT
Less than 6 min.
3HT
20sec.
20sec.
TIME
(C)