Control And Operating Characteristics; Temperature Control - Baxi PBM-i 20 Manual Del Usuario

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
temperature of -5°C gives a water temperature of +55°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 general water outlet tem-
perature to the terminal units.
• 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.
50 PBM 20÷40 EN
Compensation curve number
0.25÷0.7
0,9÷1,1
1,2÷1,5
Outside air temp. °C
Description
Enable SYSTEM compensation
curve
0= Disabled
1= Enabled
SYSTEM compensation curve
number
Enable compensation curve zone
LT1
0= Disabled
1= Enabled
Compensation curve number zone LT1
Enable compensation curve zone
LT2
0= Disabled
1= Enabled
Compensation curve number zone LT2
Enable compensation curve zone
LT3
0= Disabled
1= Enabled
Compensation curve number zone LT3
A
2,2
-5 -25
Menu Parameter Default UOM
no.
Mn01 0152 0
Mn01 0159 0,8
Mn01 0167 0
Mn01 0174 0,7
Mn01 0182 0
Mn01 0189 0,7
Mn01 015E 0
Mn01 012A 0,7
2
1,8
1,6
1,4
1,2
1
0,8
0,6
0,4
0,2