Toshiba MMU-UP0051MH-E(TR) Service Manual page 65

Check function for operation of indoor unit (Functions at indoor unit side)
This function is provided to check the operation of the indoor unit individually without connecting to the remote
controller or the outdoor unit. This function can be used regardless of the ON/OFF operation.
However, it is recommend to avoid using this function for along time, otherwise the trouble of the equipment
may occurred.
[How to operate]
1) Short-circuit CHK pin (CN71 on the indoor P.C. board).
The operation mode may differ according to the indoor unit status at 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) During the normal time, the minimum opening degree (30pls) of the indoor PMV can be set only when
both CHK pin (CN71) and DISP pin (CN72) on the indoor P.C board are short-circuited. If the short-circuit
at DISP pin (CN72) is opened, the indoor PMV will be at the maximum opening degree (1500pls).
When open DISP pin, the maximum opening degree (1500 pls) can be obtained again.
• For the detailed positions of CHK pin (CN71 on indoor P.C. board) and DISP pin (CN72 on indoor P.C.
board),
refer to the indoor P.C. board.
[How to clear]
Open CHK pin. If the system is on operation, it will temporarily stop then automatically restart after a while.
Fan motor
Indoor PMV (*)
Louver
Communication
P.C. board LED
* The actual indoor PMV opening degree may differ from the described values due to adjustment depending on
PMV types.
• To exchange the indoor PMV coil, set the indoor PMV to Max. opening degree.
Normal time
DISP pin open
(H)
Max. opening degree (1500 pls)
Vertical
All ignored
Lights
Short-circuit of CHK pin
DISP pin short circuit
(H)
Min. opening degree (30 pls)
Vertical
All ignored
Lights
– 65 –
Abnormal time
Stop
Min. opening degree (30 pls)
Immediate stop
All ignored
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