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3. CHECK POINTS
Check before operation
• Turn on the main power switch 12 hours or more before starting the operation.
• Check whether earth wire is disconnected or out of place.
• Check that air filter is installed to the indoor unit.
Heating capacity
• For heating operation, a heat pump type which absorbs the outdoor heat and deliver the heat in the room is
adopted. If the outdoor temperature lowers, the heating capacity decreases.
• When the outdoor temperature is low, common use with other heating devices is recommended.
Defrost operation in heating operation
• If frost is found on the outdoor unit during heating operation, the defrost operation starts automatically (for approx. 2
to 10 minutes) so as to increase the heating effect.
• During defrost operation, the fans of both indoor and outdoor units stop.
Protection for 3 minutes
• The outdoor unit does not operate for approx. 3 minutes after air conditioner has been immediately restarted after
stop, or power switch has been turned on. This is to protect the system.
Main power failure
• If a power failure occurs during operation, all operations stop.
• When the power is turned on after power failure, the operation lamp of the remote controller flashes to notify.
• When restarting the operation, push ON/OFF button again.
Fan rotation of stopped unit
• While other indoor units operate, the fan on indoor units on “stand-by” rotates to protect the machine once per
approx. 1 hour for several minutes.
Protective device (High pressure switch)
The high pressure switch operate the air conditioner automatically stops when excessive load is applied to the air
conditioner.
If the protective device works, the operation lamp keeps lit but the operation stops.
When the protective device works, “CHECK” characters in the remote controller display section flash.
The protective device may work in the following cases.
Cooling
• When air inlet or outlet of the outdoor unit is closed.
• When strong wind blows continuously against air outlet of the outdoor unit.
Heating
• When much dust or dirt is excessively adhered to air filter of the indoor unit.
• When air outlet of the indoor unit is blocked.
NOTE
If the protective device works, turn off the main power switch, remove the cause, and then restart the operation.
Cooling/ heating operation of Multi system air conditioner
• In a Multi system air conditioner, cooling operation and heating operation cannot be concurrently performed in the
indoor units which are installed to one outdoor system though each indoor unit can be individually controlled.
If both operations have been performed at the same time, the indoor unit under COOL mode stops and
[
Operation ready] on the operation part goes on. The indoor unit under HEAT mode continues the operation.
When COOL or HEAT mode is fixed by the manager of the air conditioner, other operation than the set mode is
unavailable. If other operation than the set mode has been performed, [
PRE-HEAT] or [ Operation ready] on
the operation part goes on and the operation stops.
Characteristics of heating operation
• Air does not blow out immediately after start of the operation. When the indoor heat exchanger has been heated
after 3 to 5 minutes passed (differs according to temperature of indoor/outdoor temperature), hot air starts blowing.
• During operation, the outdoor unit may stop when outdoor temperature becomes high.
• When other indoor unit performs heating operation during fan operation, fan operation may be stopped temporarily
to prevent discharge of hot air.
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