Operation Control Function By The Indoor Unit Controller - Mitsubishi HMA100V Technical Manual

Operation control function by the indoor unit controller

Operation mode
General
The modes mentioned below can be chosen from the control panel. Hot water operation always has the first priority over heating/cooling.
Mode
(1) Auto ● The mode is automatically switched over between (3) Heating mode and (5) Hot water operation mode.
(2) AutoC ● The mode is automatically changed among (3) Heating mode, (4) Cooling mode and (5) Hot water mode.
(3) Heating ● Hot water is supplied for heating.
● Circulation pump is always running for heating regardless of the outdoor unit operation.
● Hot water operation will be made when the tank water temperature lowers.
● When the outdoor unit can not cover the heat load, electric heater use is allowed and water in the tank is
(4) Cooling ● Cold water is supplied for cooling.
(Super Cooling) ● Circulation pump is always running for cooling regardless of the outdoor unit operation.
● Hot water operation will be made when the tank water temperature lowers;
(5) Hot water ● Always hot water operation .
● Water is not supplied to the climate system.
● Circulation pump stops when the outdoor unit stops.
● Electric heater use is not allowed.
(6) Extra hot water ● Hot water operation for higher temperature or for big demand.
● Electric heater is used if the target temperature is higher than the operable range of the heat pump.
(7) Add. Heat only ● Outdoor unit is not allowed to operate.
● Only electric heater is exclusively used for Heating and Hot water operation.
● Circulation pump is always running.
Note 1 : The measured value of outdoor air temperature (BT1) which is used for control, is averaged in accordance with the prescribed formula.
See Menu 4.2 for setting.
Note 2 : Heating/Cooling demand is calculated as numeric DM (Degree Minutes) from the supply water temperature (BT2) and its target
temperature in accordance with the prescribed formula. See Menu 2.6, 9.1.1, 9.1.2 and 9.2.1 for setting.
Note 3 : Electric heater can be replaced with external heat source of the docking feature. See Menu 8.2.1, 8.2.2 and 9.2.8 for setting.
Note 4 : Two sets of climate system can be controlled with different heating curve. See Menu 3.1-3.7 for setting.
Automatic switching rule is mentioned below.
Automatic switching rule is mentioned below.
(Alternating mode, see page 109 for details)
supplied for heating to fulfill the required heat load.
(Combined mode, see page 109 for details.)
by the outdoor unit if the electric heater is not allowed (Cooling)
by the electric heater if it is allowed (Super Cooling)
Operation control function by the indoor unit controller
Function
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'10 • HM-T-149
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