Mitsubishi MT300 - Heating Curve

'10 • HM-T-149A
45
Supply water temperature control in heating
Target supply water temperature can be seen in Menu 2.0 (for heating system 1) and 3.0 (for heating system 2).
For dual system, the target temperature for downstream heating system must be lower than that for upstream heating system.
Heating curve
Heating curve is the basic principle to decide the target supply water temperature for heating.
The lower the outdoor air temperature (BT1) becomes, the higher the target supply water temperature becomes, and the characteristics
can be adjusted in Menu 2.1.2 (for heating system1) or in Menu 3.2 (for heating system 2).
The gure below shows the case that heating curve 9 is chosen. In this case, the target supply water temperature is 55°C at -20°C
outdoor air temperature condition.
Heating curve offset 0
30
40
50
60
70
oC
FRAMLEDNINGSTEMPERATUR
- 40 oC
UTETEMPERATUR
- 10
0
10
- 20 - 30
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
V
Ä
RMEKURVA
- 5
+ 5
FÖRSKJUTNING
VÄRMEKURVA (0)
HEATING CURVE
OFFSET HEAT CURVE
Outdoor air temperature
Supply water temperature
Own heating curve
If there is not suitable heating curve programmed in a system, it is possible to create own heating curve.
To create own heating curve,
(1) Set Menu 2.1.2 to 0
(2) Set Menu 2.1.3.1 to desired supply water temperature at 20 degrees for outdoor air temperature.
(3) Set Menu 2.1.3.2 to desired supply water temperature at -20 degrees for outdoor air temperature.
(4) Set Menu 2.1.3.3 to desired outdoor air temperature which means break point.
(5) Set Menu 2.1.3.4 to desired supply water temperature at break point set in menu 2.1.3.3
Heating curve offset +2
Operation control function by the indoor unit controller
Service
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