Heat Source Setting; Operation Settings; Freeze Stat Function; Simultaneous Operation - Mitsubishi Electric EHST20C-VM6HB Service Manual

Heat source setting

The default heat source setting is heat pump and all electric heaters present in
the system to be operational. This is referred to as Standard operation on the
menu.
From the service menu use F1 and F2 buttons to scroll through list until
1.
Source Setting
is highlighted.
Press CONFIRM.
.
Heat source setting menu screen is displayed.
.
Press F3 button until preferred heat source is displayed.
4.
Press CONFIRM.
5.
If you wish to return to the service menu without saving the setting press return
6.
button. You will be asked if you are sure you wish to cancel the changes.
Choose Yes or No as appropriate.

Operation settings

To access the Operation settings menu use F1 and F2 buttons to scroll
1.
through the service menu until Operation settings is highlighted.
Press CONFIRM.
.
Operation settings menu is displayed.
.
<Freeze stat function>
From the Auxiliary settings menu highlight Freeze Stat Function.
1.
Press CONFIRM.
.
The freeze stat function screen will be displayed.
.
Use buttons F3 and F4 to adjust the minimum outdoor ambient temperature
4.
which freeze stat function will begin to operate, (3 - 20 °C) or choose .
If asterisk ( ) is chosen freeze stat function is deactivated. (i.e. primary water
freeze risk)
Note: When the system is turned off, freeze stat function is not enabled.
<Simultaneous Operation>
For periods of very low outside temperature this mode can be used.
Simultaneous operation allows both DHW and space heating to run together by
using the heat pump and/or booster heater to provide space heating whilst only
the immersion heater provides heating for DHW. This operation is only available
if BOTH a DHW tank AND immersion heater are present on the system.
From the Operation settings menu use F1 and F2 buttons to scroll through the
1.
list until Simultaneous operation is highlighted.
Press CONFIRM.
.
. Simultaneous operation screen is displayed.
To switch simultaneous operation ON/OFF press F1.
4.
To alter the temperature at which simultaneous operation starts use F3 and F4.
5.
Note:
Range of outdoor ambient temperature is −15°C to 10°C (default −15°C).
•
• System shall automatically return to routine operation. This will happen
when the outdoor ambient temp rises above the selected temp for this
specific mode of operation.
OCH531
Heat
Heat source setting screen
Operation settings menu screen
Freeze stat function screen
Simultaneous operation screen
9
Cancel last action screen