Mitsubishi Electric ecodan ECOSLIM150L-PP-MEUK Installation Manual page 57

Main Controller
25
Explanation of Compensation Curve
During late spring and summer usually the demand for space heating is reduced. To prevent the heat pump from
producing excessive flow temperatures for the primary circuit the compensation curve mode can be used to
maximise efficiency and reduce running costs. The compensation curve is used to restrict the flow temperature of
the primary space heating circuit dependent on the outdoor ambient temperature. The FTC4 uses information from
both an outdoor ambient temperature sensor and temperature sensors on the primary circuit supply to ensure the
heat pump is not producing excessive flow temperatures if the weather conditions do not require it.
Compensation Curve Setting
1. From the heating menu select edit using the F3 function button.
2. The compensation curve setting screen will be displayed.
3. In 2-zone heating operation, press F1 to switch between Zone1 and Zone2.
4. Press F2 to alter the Hi parameter (when flow temp is maximum and outdoor ambient temp is minimum).
5. Press F3 to alter the Lo parameter (when flow temp is minimum and outdoor ambient temp is maximum).
6. Press F4 to add an extra point (adjust).
Pressing F2-4 will cause the relevant edit screen to be displayed. Editing Lo and Hi parameters is done in the same
way; please see the following for more detailed explanation of parameter editing. In the parameter (Lo/Hi) edit
screen the flow temperature and outdoor ambient temperature for the compensation curve graph can be set and
altered for the 2 extremes of Hi and Lo.
1. Press F1 and F2 to change the flow temperature (y-axis of compensation curve).
2. Pressing F1 will raise the desired flow temperature for the set outdoor ambient temperature.
3. Pressing F2 will lower the desired flow temperature for the set outdoor ambient temperature.
4. Press F3 and F4 to change the outdoor ambient temperature (x-axis of compensation curve).
5. Pressing F3 will lower the outdoor ambient temperature for the set flow temperature.
6. Pressing F4 will raise the outdoor ambient temperature for the set flow temperature.
Holiday Mode
Holiday mode can be activated in 2 ways. Both methods will result in the holiday mode activation screen being shown.
Option 1.
From the main menu screen button E should be pressed. Be careful not to hold down button E for too long as this
will turn off the controller and system.
(continued)
Pre-Plumbed Slimline Cylinder Installation Manual
57