Carrier 38NQ009N, Service Manual, Page: 18 / 63

FILE NO. SVM-10036
17
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7-3-4. Heating operation
([MODE] button on the remote control is set
to the heating operation.)
7-3-3. Dry operation
([MODE] button on the remote control is set
to the dry operation.)
(1) The compressor, 4-way valve, outdoor fan and
operation display lamp are controlled as shown in
Fig. 7-
3-6.
Fig. 7-3-6
(2) The microprocessor turns the compressor on and
off at the regular intervals (4 to 6 minutes). While
the compressor is turning off, the indoor fan motor
operates in the SUPER LOW position.
The pattern of operation depending on the relation
between room temperature and preset
temperatures is shown in Fig. 7-
3-7.
Fig. 7-3-7
(3) [FAN] button on the remote control is set to AUTO
only.
(4) The ECO and Hi Power operations can not be set.
Preset
temp.
+3
+2
+1
0
OFF
ON
OFF
4-way valve
Outdoor fan
OPERATION
Compressor
ON:6min. OFF:4min.
ON:5min. OFF:5min.
OFF
ON:6min. OFF:4min.
ON:5min. OFF:5min.
display lamp
(Room temp.)
(Preset temp.)
Room temp.
Preset temp.+1
Preset temp.
Compressor
Outdoor fan
Indoor fan L. *S.L. S.L. L. L. S.L. L.
ON ON ON ON
OFF OFF OFF
*Super Low
[FAN AUTO]
-0.5
-1
-1.5
-2
*1
*2
-5.0
-5.5
0
Preset
temp.
M+
H
L
°
C
(Room temp.)
−
(Preset temp.)
° C
*2 : Fan speed = (M +
−
L) x 2/4 + L
*1 : Fan speed = (M +
−
L) x 1/4 + L
*3 : Fan speed = (M +
−
L) x 3/4 + L
(Calculated with inear approximation from M+ and L+)
Fig. 7-3-9
(1) The compressor, 4-way valve, outdoor fan and
operation display lamp are controlled as shown in
Fig. 7-3-8.
Fig. 7-3-8
(2) When [FAN] button is set to AUTO, the indoor fan
motor operates as shown in Fig. 7-3-9. When
[FAN] button is set to LOW, LOW
+ , MED, MED + or
HIGH, the motor operates with a constant air flow.
ON
OFF
ON
OFF
ON
ON
4-way valve Outdoor fan
Compressor
Preset
temp.
OPERATION display lamp
0
0.5
(Room temp.)
(Preset temp.)
° C