Mitsubishi MT300 User Manual

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132
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Service
'10 • HM-T-149
Cooling thermo-ON / OFF control
Principle of the control such as DM value is the same as heating operation.
DM (Degree-Minutes) value
DM value is limited from -100 to +400 and does not exceed the limit.
Operation state transition according to DM value
According to the DM value, operating state is changed.
Default of DM start cooling value (Menu 9.1.2) is +60.
DM start cooling (Menu 9.1.2)DM value
Compressor OFF Compressor ON
0
Exceptional processing of DM value
Forced outdoor unit operation
In cooling mode, there is no exceptional DM value processing to operate the outdoor unit according to the gap between target and
actual supply water temperature.
Forced outdoor unit stop
In case the actual supply water temperature is lower than the target temperature and the gap is bigger than the value set in Menu 9.3.12
when the outdoor unit is operating, the DM value is overwritten to -1, which results in stopping the outdoor unit operation
immediately.
Exceptional compressor speed control
Forced minimum compressor speed operation
When the compressor starts, the request frequency is set at minimum for certain period. The period can be set in Menu 9.6.5.
The control is cancelled when (1) the set time has elapsed, or (2) DM value gets signicantly high.
Operation control function by the indoor unit controller

Mitsubishi MT300 Specifications

General

Brand	Mitsubishi
Model	MT300
Category	Heat Pump
Language	English