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Operation Check Function for Indoor Air Conditioner
(Function at Indoor Air Conditioner Side)
This function is to check the operation by the indoor air conditioner singly without communication with the
remote controller or outdoor unit. This function is available regardless of system-ON or system-OFF.
However a trouble of the equipment may be caused if using this function for a long time. Use this function
for approx. several minutes as a standard.
[Operation]
1) Short-cut CHK pin (CN71 on indoor P.C. board). In this time, the operation mode differs according to status
of the indoor air conditioner.
Normal time
: Float SW and fan motor are normal.
Abnormal time: Either float SW or fan motor is abnormal.
∗
A float switch is not provided on the fresh air intake indoor unit.
The short plugs for the float switch are already inserted at shipment from the factory.
3) Restricted to the normal time, if DISP pin (CN72 on indoor P.C. board) is short cut in addition to short-
circuited CHK pin (CN71 on indoor P.C. board), you can set opening of indoor PMV only to the minimum
opening (30pls). Opening DISP pin sets opening to the maximum opening (1500pls) again.
[Releasing]
Open the CHK pin. While the system is operating, it stops once but resets automatically after several minutes.
∗
When replacing the indoor PMV coil, set the indoor PMV to the maximum opening.
∗
For 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 MCC-1403.
Fan motor
Indoor PMV (*)
Communication
P.C. board LED
CHK pin short-circuit
Normal time
Abnormal time
DISP pin open
DISP pin short-circuit
ON
ON
OFF
Max. opening (1500pls)
Min. opening (30pls)
Min. opening (30pls)
All ignored
All ignored
All ignored
Go on
Go on
Flash