Toshiba MMU-AP0091H service manual Air Conditioner Operations and Performance

If you do not plan to use the unit for more than 1 month

1. Operate the fan for 3 to 4 hours to dry the inside of the unit

3-13. Air Conditioner Operations and Performance

• Operate “FAN” mode.

2.Stop the air conditioner and turn off the main power supply

or the circuit breaker.	Wipe with a
	dry soft cloth

Checks before operation

Check before operation

•Check whether earth wire is disconnected or out of place.

•Check that air filter is installed to the indoor unit.

Heating capacity

•During heating operation the heat pump system operates by

absorbing the heat from the outside air and discharging it into the room.

WARNING

Turn on the power supply 12 hours or more before starting the air conditioner.

1.Check that the air filters are installed.

2.Check that the air outlet or inlet is not blocked.

3.Turn on the main power switch or the circuit breaker for the main power supply to the air conditioner.

When the unit has not been

turn on for a long period of time, ensure the unit is dry, as shown above and then operate in fan only mode for 3 to 4 hours.

NOTE

For an Air conditioning system which is operated regularly, cleaning and maintenance of the indoor/ outdoor units are strongly recommended.

As a general rule, if an indoor unit is operated for about 8 hours daily, the indoor/outdoor units will need to be cleaned at least once every 3 MONTHS. This cleaning and maintenance shall be carried out by a qualified person.

Failure to clean the indoor/outdoor units regularly will result in poor performance, icing, water leakage and even compressor failure.

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HINTS FOR ECONOMICAL OPERATION

Maintain room temperature at comfortable level

Clean air filters

The clogged air filter impairs the performance of the air conditioner.

Gee, chilly

Never open doors and windows more than what is necessary

Control

To keep the cool or warm air in the room, never open doors and windows more than what is necessary.

Window curtains

In cooling, close the curtains to avoid direct sunlight.

Therefore if the outside temperature drops, the units heating capacity will decrease.

•When the temperature of the outside air is low, it is recommended that you use other forms of heating in conjunction with the air conditioner.

Defrost operation during heating operation

•If the outdoor unit has a build up of frost during the heating operation, the operation mode changes auto- matically to defrost mode to increase the heating effect (for approximatley 2 to 10 minutes).

•During defrost operation, fans of the indoor and the outdoor units will stop.

Protection for 3 minutes

•The outdoor unit will not operate for approximately 3 minutes after the air conditioner has been immediately restarted after being stop, or the power supply has been turned on. This is to protect the system.

Main power failure

•If a power failure occurs during operation, all operations will stop.

•When restarting the unit, push the ON/OFF button again.

Fan rotation of stopped unit

•When other indoor units within the same system are in operation, the fan on the indoor units that are on “stand-by” will rotate to protect the machine once per approximately 1 hour for several minutes.

Protective device (High pressure switch)

The high pressure switch will stop the unit automatically when excessive load is applied to the air conditioner.

If the protective device operates, the operation lamp will stay lit but the operation will stop.

When the protective device operates, check characters “ ” on the remote controller display. The protective device may operate in the following cases.

•When suction or discharge port on the outdoor unit is blocked.

•When strong wind blows continuously against the discharge port of the outdoor unit.

•When dust or dirt is excessively adhered to the air filter of the indoor unit.

•When the discharge port of the indoor unit is blocked.

In heating, close the curtains to keep the heat in.

Ensure uniform circulation of room air

Adjust the air flow direction so that the air is evenly circulated throughout the room.

Clean, please.

Cooling/heating operation of a Heat Recovery Multi air conditioner

•When the outdoor temperature goes out of the operating range, the cooling or heating modes may not be performed in order to protect the equipment. In this case, the “ ” light goes on.

Characteristics of heating operation

Blows upward

Air flow adjustment

Cool and dry air

Warm air

•Hot air will not be blown out immediately from the indoor unit. It will take between 3 to 5 minutes (depending on temperature conditions of the room and the outside) before the indoor heat exchanger warms up suffi- ciently, to allow hot air to be blown.

•During operation, the indoor unit may stop if the outside temperature becomes to high.

•When other indoor units are in heating operation, the fan operation of the indoor unit on fan only operation may be stopped temporarily to prevent hot air from being blown out.

Characteristics of cooling/heating simultaneous operation

• If the outdoor temperature drops during operation, the fan of the outdoor unit may stop.

Blows downward