Toshiba SUPER MMK-AP0073H (IN) Service Manual page 23

3-9. Air Conditioner Operations and Performance
Check before operation
• Check whether earth wire is disconnected or out of place.
• Check that air filter is installed to the indoor unit.
• Check that the air outlet or inlet is not blocked.
• Turn on the main power switch or the circuit breaker for the
main power supply to the air conditioner.
Heating capacity (for Heat-pump model only)
• For heating, a heat pump system which sucks in outside heat air and discharges it into the room is adopted.
If temperature of the outside air lowers, the heating capacity decreases.
• When temperature of the outside air is low, it is recommended to use other heating equipment together.
Defrost operation during heating operation (for Heat-pump model only)
• If the outdoor unit has some frost during heating operation, the operation mode changes automatically to defrost mode
to increase the heating effect (for approx. 2 to 10 minutes).
• During defrost operation, fans of the indoor and the outdoor units stop.
3 minutes protection
• 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 occurred during the operation, all operations stop.
• 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 stops the air conditioner automatically 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, "
in the remote controller display part flash. The protective device may work in the following cases.
<Cooling operation>
• When the air inlet or air outlet of the outdoor unit is blocked.
• When strong wind blows continuously against the air outlet of the outdoor unit.
<Heating operation>
• When dust or dirt is excessively adhered to air filter of the indoor unit.
• When the air outlet of the indoor unit is blocked.
Cooling/heating operation of Modular Multi system air conditioner
• In Modular Multi system air conditioner, each indoor unit can be individually controlled. However, cooling operation and
heating operation cannot be performed concurrently for the indoor units which are connected to one outdoor unit.
When cooling operation and heating operation are performed concurrently, the indoor unit which is performing cooling
operation stops, and "
If the manager has fixed the setting to COOL or HEAT, other operation than set up one cannot be performed.
When other operation than set up one is performed, "
Characteristics of heating operation (for Heat-pump model only)
• Hot air is not out immediately after the operation has started. After 3 to 5 minutes (differs according to room or outside
temperature) has passed and the indoor heat exchanger has been warmed up, hot air blows out.
• During operation, the outdoor unit may stop if outside temperature becomes high.
• When other outdoor unit performs heating operation while the fan is operating, the fan operation may be stopped
temporarily to prevent blowing of hot air.
Air conditioner operating conditions
For proper performance, operate the air conditioner under the following temperature conditions:
Cooling operation
Heating operation
If air conditioner is used outside of the above conditions, safety protection may operate.
" on the display is lit. The indoor unit which is performing heating operation continues operation.
Outdoor temperature : –5°C to 43°C (Dry-bulb temp.)
Room temperature : 21°C to 32°C (Dry-bulb temp.), 15°C to 24°C (Wet-bulb temp.)
CAUTION Room relative humidity: less than 80 %. If the air conditioner operates
in excess of this figure, the surface of the air conditioner may cause dewing.
Outdoor temperature : –15°C to 15.5°C (Wet-bulb temp.)
Room temperature : 15°C to 28°C (Dry-bulb temp.)
Turn on the power switch 12 hours or more
before starting before operation.
" on the display is lit and the operation stops.
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WARNING
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