Mitsubishi Heavy Industries SRK60ZJX-S, Technical Manual

Page: 160 / 272

- 159 -
'10 • SR-T-091
(q) Drain motor (DM) control
1)
Drain motor (DM) is operated during the cooling or dehumidifying mode operations and simultaneously wity the com-
pressor 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) Cooling Dehumidifying Fan (2) Heating
Compressor ON Control A
Compressor OFF Control B
Note (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
a) Control A
i) 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 motor comtinues to be ON.
ii) It keeps operating while the float switch is detecting the anomalous condition.
b) Control B
If the float switch detects any anomalous drain condition, the drain motor is turned ON for 5 minutes, and at 10 sec -
onds after the drain 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 motor is turned ON.
(The ON condition is maintained during the drain detection.)
(r) Refrigeration cycle system protection
1) Starting conditions
a)
b)
When 5 minutes have elapsed after the compressor ON or the completion of the defrost control
Other than the defrost control
2) Contents of control
a)
3) Resetting condition
When the compressor has been turned OFF
b)
When the conditions of 1) above are met, the compressor stops.
Error stop occurs when the compressor has stopped 3 times within 60 minutes.
c)
When, after meeting the conditions of a) and b) above, the compressor speed, indoor air temperature (Th1) and indoor
heat exchanger temperature (Th2) have met the conditions in the following table for 5 minutes:
Compressor speed (N) Operation mode
Cooling
Heating
Indoor air temperature (Th1)
Th1−4<Th2
Indoor air temperature (Th1)/
Indoor heat exchanger temperature (Th2)
Th2<Th1+6
50 N <
=
10 Th1 40 <
=
<
=
0 Th1 40 <
=
<
=
50 N <
=
◆
Heating
1) Operating conditions: When the outdoor air temperature (TH2) is 4ºC 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 (TH2) is 6ºC or higher.
b) The compressor command speed is 0 rps.