Service
-
133
-
'10 • HM-T-149
Operation control function by the indoor unit controller
Hot water operation control
Hot water operation is prioritized over heating and cooling.
ON/OFF control
Regardless of the DM value, hot water operation when tank water temperature (BT6) lowers below Start temp HW in Menu 1.2. It
nishes when the tank water temperature reaches Stop temp HW in Menu 1.3.
In case there are demands for both hot water and heating/cooling, there is a case that the operation finishes although the tank
temperature doesn’t reach the threshold. For details, see Hot water operation during alternating mode
Pump speed is controlled so that higher temperature water can be returned to the tank.
Compressor speed control
During the hot water operation, compressor speed is controlled according to the map linked with the outdoor air temperature. The map
can be changed with the setting in Menu 1.11.3 and 1.11.4
Hot water operation during alternating mode
When there are demands for both hot water and heating, the operation is switched between heating state and hot water state in order
to cover both demands.
Operation time ratio between heating state and hot water state can be set in Menu 8.5.1 (Period time) and 8.5.2 (Max time for HW).
Menu 8.5.2 shows the operation duration for hot water and the rest of the time Menu 8.5.1-8.5.2 is for heating.
As long as both heating and hot water demands remain, in other words the conditions to nish both operations are not fullled, both
operations appear in turn according to the duration of which is set in the menu.
If either condition to nish heating or hot water operation is fullled, another operation will be done thereafter unless both demands
come up again.
Hot water operation during cooling mode
There are two different ways to produce hot water during cooling and it can be chosen by the setting of electric heater use in Menu
8.2.1 (Allow add. heat).
If the electric heater is allowed to use (Cool or Heat+Cool in setting), hot water production is done by electric heater.
If it is not allowed (Off or Heat in setting), hot water production is done by the outdoor unit.
Defrost operation
When frost accumulates on the surface of the outdoor heat exchanger, defrost operation starts to remove it.
For detailed operation condition, see outdoor unit control.
During defrost operation, indoor unit operates as follows in order to extract heat from the heating system;
● Shunt valve QN11 and ball valve QM 30 and 31 are towards heating system.
● Circulation pump GP1 keeps operating
In case the return water temperature (BT3) does not reach the threshold value dened in Menu 9.1.11, the ball valves QM30 and 31
switch towards hot water to extract heat from the tank.
Still the return water temperature is lower than the threshold, electric heater starts energized.
Operation control function by the indoor unit controller
To Next Page
Loading...
Need help?
General
