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Notes on operations and performance
Check before operation
• Turn on the power switch at least 12 hours before
starting operation.
• Make sure the earth wire is securely connected.
• Make sure the air filter is attached to the indoor unit.
Heating performance
(For heat-pump model only)
• A heat pump system, which gathers outside heat and
emits it into a room, is used for heating. When the
outside air temperature falls, the heating capacity of
the unit is reduced.
• When the outside temperature is low, it is
recommended that you also use other heating
equipment.
Defrosting during heating
(For heat-pump model only)
• If frost falls on the outdoor unit during heating,
defrosting is automatically performed (for
approximately 2 - 10 minutes) to increase the
heating effect.
• The fan of the indoor unit is stopped during
defrosting.
3-minute protection
The outdoor unit will not operate for approximately 3
minutes after the air conditioner has been immediately
restarted after stopping, or the power switch has been
turned on. This is to protect the system.
Power failure
• In the case of a power failure, all operations stop.
• To resume operations, push the ON/OFF button.
Fan rotation of a stopped
indoor unit
While other indoor units operate, the fans on indoor
units in stand-by mode rotate for several minutes
approximately once per one hour to protect the
machines.
Protective device
(High pressure switch)
The high pressure switch stops the air conditioner
automatically when excessive load is applied to the air
conditioner.
If the protective device activates, the unit’s running
stops and the operation lamp blinks.
When the protective device activates, the
indicator
and the check code are displayed on the remote
controller.
The protective device may activate in the following
cases:
During cooling
• When the air intake or air discharge of the outdoor
unit is blocked.
• When strong wind blows continuously against the air
discharge of the outdoor unit.
During heating (for heat-pump model only)
• When dust or dirt is excessively adhered to the air
filter of the indoor unit.
• When the air discharge of the indoor unit is blocked.
NOTE
When the protective device activates, turn off the
power switch, remove the cause, and then restart
running.
Cooling / Heating operations
Each unit can be controlled individually. However,
indoor units connected to the same outdoor unit cannot
perform cooling and heating simultaneously.
When you attempt simultaneous operation, indoor
units performing cooling are stopped, and the running
preparation indicator
is displayed on the remote
controller.
An indoor unit performing heating continues running.
When you attempt an operation without the configured
settings, the running preparation indicator
is
displayed on the remote controller and operation stops.
If operation is fixed to cooling or heating by the air
conditioner administrator, only the configured settings
apply to the operation.
Characteristics of heating
(For heat-pump model only)
• Air does not come out immediately after heating
starts.
Heated air comes out after 3 to 5 minutes
(depending on the room / outside temperatures),
after the indoor heat exchanger warms up.
• When the outside temperature increases, the
outdoor unit may stop.
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Summary of Contents for MMY-MAP0501HT8-E
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