Cold Weather Function; Room Temp Control (Heating) - Mitsubishi Electric EHST20C-VM6HB Service Manual

<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.
From the Operation settings menu use F1 and F2 buttons to scroll through the
1.
list until Cold weather function is highlighted.
Press CONFIRM.
.
Cold weather function screen is displayed.
.
To switch Cold weather function ON/OFF press F1.
4.
To alter the temperature at which heater switching function starts use F3 and
5.
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.
<Room Temp Control (Heating)>
This function allows operational setting of flow temperature range from the Ecodan and
also the time interval at which the FTC4 collects and processes data for the auto adap-
tation mode.
From the Operation settings menu use F1 and F2 buttons to scroll through the list
1.
until Room temp. control (HEATING) is highlighted.
Press CONFIRM.
.
3. Use F1 and F2 keys to scroll through the menu selecting each subtitle in turn by
pressing CONFIRM. See the table below for description of each setting.
4. Enter the desired number using the function keys and press CONFIRM.
Menu subtitle
Temp. control interval
Flow temperature range
Heat pump thermo diff.adjust
*1 The minimum flow temperature that prohibits heat pump operation is 20ºC.
*2 The maximum flow temperature that allows heat pump operation equals to the maximum temperature set in the flow temp. range menu.
OCH531
Function
Selectable according to the heat emitter type and the mate-
rials of floor (i.e. radiators, floor heating-thick, -thin concrete,
wood, etc.)
To minimize the loss by frequent ON and OFF in mild out-
Minimum temp.
door ambient temp. seasons.
Maximum temp. To set max. possible flow temp according to the type of heat
emitters.
To minimize the loss by frequent ON and OFF in mild out-
On/Off
door ambient temp. seasons.
Lower limit Prohibits heat pump operation until the flow temperature
drops below the target flow temperature minus lower limit
value.
Allows heat pump operation until the flow temperature rises
Upper limit
above the target flow temperature plus upper limit value.
Cold weather function screen
Room temp. control (HEATING) screen
Range
10 - 60
5 - 45
5 - 60
On/Off
−9 - −1
+ - +5
40
Unit Default
mins. 10
ºC
0
ºC
50
— On
ºC −5
ºC
+5