Baxi PBM-i 20 Manual Del Usuario página 133

CONTROL AND OPERATING CHARACTERISTICS
Automatic mode changeover based on outside
temperature
In mode, the operating mode (heating / cooling)
changes automatically, avoiding the need for the user to
change the mode manually.
Mode changeover is based on the diagram shown in the fig-
ure.
The centre zone A corresponds to an area of inactivity, as
the outside climate conditions mean neither heating nor
cooling is required.
Selecting the system pump curve
Four operating curves can be selected, depending on sys-
tem pressure drop.
The curves are selected by parameter.
The pressure head refer to the value at the fittings.
System pump operation
When reaching the system water set point, the compressor
stops and the system pump is activated periodically, so as
to minimise energy consumption.
Pump operating time can be selected using parameter
0147, while the interval between one sniffing cycle and the
next is set using parameter 0148.
Intermittent activation of system pump operation can be
selected using parameter 0143 (0= system pump always on
to, 1=system pump activated at intervals).
Heating
ON
A
OFF
0106= 16°C
0106+0107=18°C
Description
Automatic mode changeover set
point in hEATING
Automatic mode changeover dif-
ferential in hEATING
Automatic mode changeover set
point in COOLING
Automatic mode changeover dif-
ferential in COOLING
System pump curve
120
Curve 4
100
Curve 3
80
Curve 2
60
Curve 1
40
20
0
0 1
Demo graph
Description
System pump curve number
1= Curve 1
2= Curve 2
3= Curve 3
4= Curve 4
In systems with fan coils, the time between one sniffing
cycle and the next should be reduced in order to avoid cool-
ing excessive of the water, and if the system water content
is equal to the minimum value shown in the paragraph on
"water connections", parameter 0143 should be set to 0.
A
Cooling
Outside temp.
0108=26°C
0108-0109=24°C
Menu Parameter Default UOM
no.
Mn01 0106 16
Mn01 0107 2
Mn01 0108 24
Mn01 0109 2
2 3 4
Water flow-rate [m /h]
3
Menu Parameter Default UOM
no.
Mn01 0146 4
EN PBM 20÷40
°C
°C
°C
°C
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