'20 • SR-SM-285
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14
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(q) Drain pump motor (DM) control
(i)
Drain pump motor (DM) is operated during the cooling or dehumidifying mode operations and simultaneously wity the
compressor ON. The DM continues to operate for 5 minutes after the operation stop, anomalous stop, thermostat stop or
when it was switched from the cooling and dehumidifying operations to the fan or heating operation.
Indoor unit operation mode
Stop
(1)
COOL
DRY
FAN
(2)
HEAT
Compressor ON
Control A
Compressor OFF
Control B
Notes (1) Inciuding the stop from the cooling, dehumiditying, fan
and heating, and the anomalous stop
(2) Inciuding the “FAN” operation according to the
mismatch of operation modes
1) Control A
a) If the float switch detects any anomalous draining condition, the unit stops with the anomalous stop and the drain
pump starts. After detecting the anomalous condition, the drain pump motor continues to be ON.
b) It keeps operating while the float switch is detecting the anomalous condition.
2) Control B
If the float switch detects any anomalous drain condition, the drain pump motor is turned ON for 5 minutes, and at 10
seconds after the drain pump motor OFF it checks the float switch. If it is normal, the unit is stopped under the normal
mode or, if there is any anomalous condition, displayed by the flashing of display lights and the drain pump motor is
turned ON. (The ON condition is maintained during the drain detection.)
(ii) Heating
1) Operating conditions
When the outdoor air temperature (TH3) is 0ºC or lower continues for 30 seconds while the compressor command
speed is other than 0 rps.
2) Detail of operation
The outdoor fan is stepped up by 2 speed step at each 20 seconds. (Upper limit 8th speed)
3) Reset conditions
When either of the following conditions is satisfied
a) The outdoor air temperature (TH3) is 2ºC or higher.
b) The compressor command speed is 0 rps.
(r) Refrigeration cycle system protection
(i) Starting conditions
1)
2)
When 5 minutes have elapsed after the compressor ON or the completion of the defrost control
Other than the defrost control
(ii) Contents of control
1)
(iii) Reset condition
When the compressor has been turned OFF
2)
When the conditions of (i) above are satified, the compressor stops.
Error stop occurs when the compressor has stopped 3 times within 60 minutes.
3) When, after satisfying the conditions of 1) and 2) above, the compressor speed, room temperature (Th1) and indoor
heat exchanger temperature (Th2) have satisfied the conditions in the following table for 5 minutes:
Note (1) Except that the fan speed is Hi in heating operation.
Compressor speed (N)
Operation mode
Cooling
Heating
(1)
Indoor temperature (Th1)
Th1−4<Th2
Indoor temperature (Th1)/
Indoor heat exchanger temperature (Th2)
Th2<Th1+6
50 N
<
=
10 Th1 40
<
=
<
=
0 Th1 40
<
=
<
=
50 N
<
=
( r ) Refrigeration cycle system protection
3) Reset conditions
When either of the following conditions is satisfied
a) The outdoor air temperature (TH3) is 25ºC or higher.
b) The compressor command speed is 0 rps.
Summary of Contents for SRR25ZS-W
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