Cooling Operation; Fan Only Operation - Carrier 42CJR024-723 Service Manual

(3) The indoor heat exchanger restricts revolving
speed of the fan motor to prevent a cold draft. The
upper limit of the revolving speed is shown in
Fig. 7-2-8 and Table 7-2-1.
46 34
45 33
33 21
32 20
*2 A+4 A+4
A-8 A-8
*6 *5
NOTES :
*1: The fan stops for 2 minutes after thermostat-OFF.
*2: A is 24°C when the preset temperature is 24°C or
more and A is the preset temperature when it is
under 24°C.
*3: SUL means Super Ultra Low.
*4: Calculated from difference in motor speed
between SUL and HIGH.
Fig. 7-2-8 Cold draft preventing control
*5 and *6:
Table 7-2-1
Fan *5
speed Starting period
• Up until 12 minutes
AUTO
passed after starting
the unit
• From 12 to 25 minutes
passed after starting
the unit and room
temperature is 3°C
lower than preset
temperature
• Room temperature
Manual
(L – H) < Preset temperature
Manual
(One of
AUTO
5 speed)
*4
L-H
(Up to
setting
speed)
3
SUL*
SUL*1
Stop
*6
Stabilized period
• From 12 to 25 minutes
passed after starting
the unit and room
temperature is
between preset
temperature and 3°C
lower than preset
temperature
• 25 minutes or more
passed after starting
the unit
• Room temperature
Preset temperature
–4°C –3.5°C
7-2-5. Automatic operation
([MODE] button on the remote control is set
to the automatic operation.)
(1) One of 3 operations (Cooling, Fan only or Heating)
is selected according to difference between the
preset temperature and the room temperature at
which the automatic operation has started, as
shown in Fig. 7-2-9. The Fan only operation
continues until the room temperature reaches a
level at which another mode is selected.
(2) Temporary Auto
When the TEMPORARY button on the indoor unit
is pushed, the preset temperature is fixed at 24°C
and the indoor unit is controlled as shown in
Fig. 7-2-9.
°C

Cooling operation

The louver moves to the position same
as Hi POWER operation.
+4
Cooling operation
0

Fan only operation

-1
Heating operation
42HNR024-713
42HNR018-713
Fig. 7-2-9
– 31 −
FILE NO. SVM-05010
42CJR024-713, 42TAR024X-723
42CJR018-713, 42TAR018-723