Check Points - Toshiba Super Modular Unit MMU-AP0091H Installation Manual

3. CHECK POINTS

Check before operation
• Turn on the main power supply 12 hours or more before starting the operation.
• Check and ensure earth wiring is connected.
• Check and ensure air filter is fitted to indoor unit.
Heating capacity
• During the heating operation the heat pump units absorbs heat from the outside and delivers heat into the room. If the
outdoor temperature lowers the heating capacity decreases.
• When the outdoor temperature is low, it is recommended that other forms of heating are used.
Defrost operation in heating operation
• If frost is found on the outdoor unit during heating operation, the defrost operation starts automatically for a period of 2 to
10 minutes. This will increase the heating effect.
• During the defrost operation, both the indoor and outdoor unit fans will stop.
Protection for 3 minutes
• The outdoor unit does not operate for approximately 3 minutes after the air conditioner has been immediately restarted
after stop, or power supply has been turned on. This is to protect the system.
Main power failure
• If a power failure occurs during operation, all unit operations will stop.
• When the power is turned on after power failure, the operation lamp on the remote controller will flash.
• When restarting the operation, push ON/OFF button again.
Fan rotation of stopped unit
• When other indoor units are in operation, the fan on the indoor unit which is in stand-by mode will rotate to protect the
machine. This occurs once an hour for several minutes.
Protective device (High pressure switch)
When excessive load is applied to the air conditioner the high pressure switch will activate. Upon activation of this protective
device the operation lamp will remain on, but the unit operation will stop. When the protective device operates, 'CHECK'
characters will be displayed flashing on the remote controller. The protective device may be activated in the following cases.
Cooling
• When air inlet or outlet of the outdoor unit is closed.
• When strong wind blows continuously against the air outlet of the outdoor unit.
Heating
• When excessive dust or dirt is adhered to the air filter of the indoor unit.
• When the air outlet of the indoor unit is blocked.
NOTE
If the protective device activates, turn off the main power supply, remove the cause and restart the operation.
Cooling/ heating operation of Multi system air conditioner
• In a Multi system air conditioner, cooling and heating operation cannot be performed at the same time from
indoor units that are connected within a refrigerant cycle to the same outdoor unit or module. Each indoor unit
can be operated independently, if both operations (Heat and cool) are performed at the same time, the indoor
unit which is in cooling mode, will stop and display [
heat mode will continue to operate.
When cool or heat mode is selected as the prioritized mode of the air conditioner, the other operation mode
becomes unavailable. If a mode other than the set mode is selected. [
will appear on the remote controller and the operation does not function.
Characteristics of heating operation
• Upon starting the air conditioner, air will not immediately blow out. When the indoor heat exchanger has been
heated for 3 to 5 minutes (differs according to the temperature of the indoor/outdoor temperature), hot air starts
blowing.
• During the operation, the outdoor unit may stop when the outdoor temperature becomes to high.
• When a unit is in fan only operation and a further unit then demands heating mode, the fan operation maybe
stopped temporarily to prevent the discharge of hot air.
Operation ready] on the remote controller. The unit in
PRE-HEAT] or [
17
Operation ready]