Carrier 42NQ009N - Cooling Operation; Fan Only Operation; Heating Operation

FILE NO. SVM-10036
18
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(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. 7-3-10 and Table 7-3-2.
7-3-5. 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. 7-3-11. The Fan only operation
continues until the room temperature reaches a
level at which another mode is selected.
(2) Temporary Auto
When the RESET 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. 7-3-11
* No limitation while fan speed MANUAL mode is in stabilit
y.
* A: Wh
e
n T
sc
≥
24
,
A is 24
,
and when Tsc < 24
,
A is Ts
c
Tsc: Set valu
e
H
Line-approximate
H and S
U
L with Tc
.
SUL
Stop
46 46
T
c
34
45 45 33
33 33 21
32 32 20
*A+0 *A+0 *A+0
*A-8 *A-8 *A-8
Fan speed MAN
U
AL in startin
g
Fan speed AUTO in stabilit
y
Fan speed AUTO in startin
g
Fig. 7-3-10 Cold draft preventing control
Table 7-3-2
Fan *5 *6
speed Starting period Stabilized period
AUTO • Up until 12 minutes
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
Manual • Room temperature
(L – H) < Preset temperature
–4°C
• 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
–3.5°C
(Room temp.)
−
(Preset temp.)
0
°C
Cooling operation
Fan only operation
-1
Fig. 7-3-11
Heating operation