Operation Settings - Mitsubishi Electric EHST20C-VM6HB Installationshandbuch

5
System Set Up

Operation settings

1. To access the Operation settings menu use F1 and F2 buttons to scroll
through the service menu until Operation settings is highlighted.
2. Press CONFIRM.
3. Operation settings menu is displayed.
<Freeze stat function>
1. From the Auxiliary settings menu highlight Freeze Stat Function.
2. Press CONFIRM.
3. The freeze stat function screen will be displayed.
4. Use buttons F3 and F4 to adjust the minimum outdoor ambient temperature
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.
1. From the Operation settings menu use F1 and F2 buttons to scroll through the
list until Simultaneous operation is highlighted.
2. Press CONFIRM.
3. Simultaneous operation screen is displayed.
4. To switch simultaneous operation ON/OFF press F1.
5. To alter the temperature at which simultaneous operation starts use F3 and F4.
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.
<Cold weather function>
For extremely low outdoor ambient temperature conditions when the heat pump's
capacity is restricted the heating or DHW is provided only by the electric booster
heater (and immersion if present). This function is intended for use during
extreme cold periods only. Extensive use of direct electrical heaters ONLY will
result in higher electric usage and may reduce working life of heaters and related
parts.
1. From the Operation settings menu use F1 and F2 buttons to scroll through the
list until Cold weather function is highlighted.
2. Press CONFIRM.
3. Cold weather function screen is displayed.
4. To switch Cold weather function ON/OFF press F1.
5. To alter the temperature at which heater switching function starts use F3 and
F4.
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.
Operation settings menu screen
Freeze stat function screen
Simultaneous operation screen
Cold weather function screen
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