Toshiba MML-AP0124H2UL Service Manual page 32

<In case of wireless remote control (TCB-AX32-UL)>
1. When TEMPORARY button is pushed for 10 seconds or more, Pi!" sound is heard and the operation
changes to a forced cooling operation. After approx. 3 minutes, a cooling operation is forced to start.
Check if cool air starts blowing. If the operation does not start, check wiring again.
2. To stop a test operation, push TEMPORARY button once again (Approx. 1 second).
• Check wiring / piping of the indoor and outdoor units in forced cooling operation.
Check function for operation of indoor unit (Functions at indoor unit side)
This function is provided to check the operation of the indoor unit without communication with the remote
control or the outdoor unit. This function can be used regardless of operation or stop of the system.
However, if using this function for a long time, a malfunction of the equipment may be caused. Limit using
this function to few minutes only several minutes.
[How to operate]
1) Short-circuit CHK pin (CN071 on the indoor P.C. board).
The operation mode differs according to the indoor unit status in that time.
Normal time: Both float SW and fan motor are normal.
Abnormal time: Either one of float SW or fan motor is abnormal.
2) Restricted to the normal time, if short-circuiting DISP pin (CN072 on the indoor P.C. board) in addition to
short-circuit of CHK pin (CN071 on the indoor P.C. board), the minimum opening degree (30pls) can be
set to the indoor PMV only.
When opening DISP pin, the maximum opening degree (1500pls) can be obtained again.
[How to clear]
Open CHK pin. While the system is operating, it stops once but automatically returns to operation after
several minutes.
Fan motor
Indoor PMV ( )
Communication
P.C. board LED
Normal time
DISP pin open(CN071)
(H)
Max. opening degree (1500pls)
All ignored
Lights
TEMPORARY button
Short-circuit of CHK pin(CN071)
DISP pin short circuit(CN071)
(H)
Min. opening degree (30pls)
All ignored
Lights
– 32 –
Abnormal time
Stop
Min. opening degree (30pls)
All ignored
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