Temperature Control - Mitsubishi Electric Climaveneta i-BX-004-013M Installation, Operation And Service Manual

CONTROL AND OPERATING CHARACTERISTICS

Temperature control

The heating or cooling circuit water temperature is calculat-
ed by the controller and depends on the following factors:
A) system water set point compensation in heating or cool-
ing (see paragraph)
B) room temperature influence (see paragraph)
C) minimum and maximum heating water temperature limit
(see paragraph)
D) room temperature set point
A) System water temperature set point compensation
The water temperature set point in heating or cooling is cal-
culated based on the outside temperature trend according to
settable curves.
Water set point compensation diagram in HEATING
The compensation curve in heating mode can be modified
to allow correct heat pump operation depending on the heat-
ing system used (radiant panels, radiators, fan coils).
Example: Selecting heating curve 1.4 with an outside air tem-
perature of -5°C gives a water temperature of about +53°C.
A heating curve that is too high gives an excessive outlet
temperature, a curve that is too low may mean the desired
room temperature is not reached.
The curve can be set separately for each zone, depending
on the type of room terminal.
The following compensation curves are recommended:
Type of terminal
Radiant panels
Fan coils
Radiators
The compensation curves in HEATING are divided into:
• SYSTEM curve: determines the set point for heat pump
operation and any high temperature zones.
The set point calculated refers to the heat pump water
temperature.
Make sure that the temperature difference is within the
limits required by the manufacturer.
• ZONE curve* determines the water outlet temperature in
the mixed circuit.
For systems configured with mixed zones, the SYSTEM
curve and ZONE curve must be selected.
The system and zone curve work in cascading, the mixed
zone curve may therefore not request a higher value than
the one supplied by the system curve.
The compensation curves refer to a room temperature set
point of 20°C on the N_THC control.
50 i-BX-(Y)_i-BX-N-(Y) EN
Compensation curve number
0.25÷0.7
0,9÷1,1
1,2÷1,5
Outside air temp. (mean) °C
Description
Enable SYSTEM compensation
curve
NOT
YES
SYSTEM compensation curve
number
Enable compensation curve zone
LT1
NOT
YES
Compensation curve number zone LT1
* the N-THC zone room control unit must be installed.
A
2,2
-5 -25
Menu Parameter Default UOM
no.
Mn01 0152 NOT
Mn01 0159 1
Mn01 0167 NOT
Mn01 0174 0,7
2
1,8
1,6
1,4
1,2
1
0,8
0,6
0,4
0,2