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2) Heating fan control
Q
The outdoor fan is controlled by TE sensor, TO sensor and the operation frequency.
(From Min. W1 to Max. are controlled according to the following table.)
R
During 3 minutes after start-up, the fan is fixed
with the maximum fan tap corresponding to
zone in the following table. After then the fan is
controlled by temperature of TE sensor.
S
If status, TE
>
24°C continues for 5 minutes, the
operation stops. This status is same to the
usual Thermo-OFF which has no alarm display,
and the fan restarts after 2 minutes and 30
seconds. This intermittent operation is not
abnormal.
T
When the above status
R
occurs frequently, it
is considered that the filter of suction part of the
indoor unit is stain. Clean the filter and then
restart the operation.
(The operation frequency differs according to the model type. The case of SM110 is shown in the table below.)
5. Coil heating control
1) This control function heats the compressor by turning on the stopped compressor instead of a case
heater. It purposes to prevent slackness of the refrigerant inside of the compressor.
2) As usual, turn on power of the compressor for the specified time before a test run after installation,
otherwise a trouble of the compressor may be caused.
As same as a test run, it is recommended to turn on power of the compressor beforehand when starting
operation after power of the compressor has been interrupted for a long time.
3) A judgment for electricity is performed by TD and TO sensors. If TO sensor is defective, a backup control
is automatically performed by TE sensor.
For a case of defective TO sensor, judge it with the outdoor LED display.
4) The power is turned off when TD is 30°C or more.
Maximum
Temp. range
10°C
<
TO
5
<
TO < 10°C
TO < 5°C
TO error
Below 37 Hz
W7
WA
WF
WF
Above 37 Hz below 60 Hz
W8
WB
WF
WF
Above 60 Hz
W9
WC
WF
WF
–2 tap/20 seconds
–1 tap/20 seconds
rpm hold
+1 tap/20 seconds
–2 tap/20 seconds
STOP timer count
24
21
18
15
TE [˚C]
* TO sensor is read in once per 15 minutes
No power-ON
Continuous ON (L)
Continuous ON (M)
No power-ON
Continuous ON (L)
Continuous ON (M)
Power-ON condition
TD < 30˚C
(In trouble of TO sensor)
TO [˚C]
TE [˚C]
20
18
12
10
18
15
10
8
L
M
SM160
30W and equivalent
40W and equivalent
REQUIREMENT
While heating the coil, the power sound may be
heard. However it is not a trouble.