Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 838

FDC-HKX
(1)
OFF
During compressor ON
During compressor OFF
• Flow chart of drain motor operation
* 1 In the flow in the frame of broken line, operations of operation mode change and thermostat reset are effective and operated immediately upon selection. However,
the compressor ON command is not transmitted.
(1) Control A
a) If the float switch detects the draining, operation is stopped with the error stop (E9 is displayed) and operate the drain pump.
b) Float switch is checked 3 minutes later on the unit stopped by the error and, if the error persists still, the drain motor is left at
ON but, if the error has already been reset, the drain motor is turned OFF. E9 is displayed till the error is reset.
(2) Control B
a) If the float switch detects the draining, the expansion valve is closed, the drain motor is turned ON for 3 minutes and, as 10
seconds elapses after the drain motor OFF, the float switch is checked. If the result is normal, the operation stops in the
normal way while, if it is not normal, E9 is displayed, the drain motor is turned ON and the operation stops with the error stop
with the expansion valve being closed completely. (It is left at ON while the draining is detected.)
(20) External control (remote display)/control of input signal
(a) External control (remote display) output
Following output connectors (CNT) are provided on the control circuit board of indoor unit.
(i) Operation output: Power to engage DC 12V relay (provided by the customer) is outputted during operation.
(ii) Heating output: Power to engage DC 12V relay (provided by the customer) is outputted during the heating operation.
(iii) Compressor ON output: Power to engage DC 12V relay (provided by the customer) is outputted while the compressor is
operating.
(iv) Error output: When any error occurs, the power to engage DC 12V relay (provided by the customer) is outputted.
836
Indoor unit operation mode
COOL DRY FAN
Control A
Control B
Float switch operation (Contactor : Open)
Control B
Operation mode?
*1
Drain motor ON
3 minutes
NO
after float operation?
YES
Drain motor OFF
10 seconds after
NO
drain motor OFF?
YES
Reset
Float SW?
Operation
Error stop E9
End
Drain motor 3-minute ON
Notes (1) Including OFF and error stop during
COOL, DRY, FAN and HEAT.
(2)
HEAT
(2) Including "FAN" operation due to unmatch
of operation mode.
Control A
Error stop E9
Drain motor ON
Compressor OFF
3 minutes
after float operation?
Float SW?
Operation
Reset
Drain motor OFF
Error stop E9 continues
Float operation?
Drain motor ON continues