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AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – [email protected] – www.industrietechnik.it
• Cascade control (
014
=2)
This type of operation is only possible if a modulating heating output and/or cooling output is defined, as shown below.
modulating heating output:
- modulating heating valve if
002
=2 and
030
=3 (AO1) or
031
=3 (AO2) or
032
=3 (AO3).
- modulating electrical resistance if
002
=1 and
030
=6 (AO1) or
031
=6 (AO2) or
032
=6 (AO3).
modulating cooling output:
- modulating valve if
003
=1 and
030
=4 (AO1) or
031
=4 (AO2) or
032
=4 (AO3).
In addition, a supply sensor must be present at the analogue input
019
=2 (AI1) or
021
=2 (AI2) or
023
=2 (AI3).
The operating season is automatically selected based on the room temperature, the 4-pipe controller setpoint
109
and the
neutral zone
123
.
If Treg <
109
- (
123
/2), the operating season is cooling, and the
“HEAT”
icon is displayed.
If Treg >
109
+ (
123
/2), the operating season is cooling, and the
“COOL”
icon is displayed.
Speed
100%
152
Extractor fan
10V
Volt
ON
OFF
Tlim
129
Val_lim_max_H
128
126
Control temperature
Supply setpoint
128
118
107
126
Control temperature
Supply setpoint
128
118
108
126
Control temperature
Supply setpoint
128
118
109
ON
OFF
Tlim
129
Val_lim_min_H
126
150
153
151
Supply fan
Speed
100%
150
Extractor fan
10V
Volt
152
151
153
Supply fan
Speed 1
Ambient CO2
Fan
Speed 3
I56
I55
Outdoor temp
Setpoint offset
I34
I32
I35
I38
I39
I33
I36
I37
Supply temp.
OUTH
100%
HEATING
modulating
114
116
123
Supply
setpoint
COOLING
modulating
0%
Treg
HEATING
COOLING
100%
0%
Treg
122
124
WCS
100%
0%
Treg
OUT
124
WCS
114
AOx
DOx
DOx
126
Control temperature
Supply setpoint
128
118
Set_reg
Control temperature
HEATING
I24
COOLING
Set_comp
Speed 1
Humidity
Fan
Speed 3
I42
I41
AOx
ON
OFF
Tlim
129
Val_lim_max_C
128
ON
OFF
Tlim
129
Val_lim_min_C
126
DOx
DOx
OUT
WHS
WCS
Treg
HEATING
COOLING
109
I23
I23
OUTC
Supply temp.
OUTH
100%
Modulating
HEATING
114
123/2
Supply setpoint
0%
Supply temp.
100%
116
Supply setpoint
Modulating
COOLING
0%
OUTC
123/2
Treg: room sensor
109
:
4-pipe setpoint control
123
: neutral zone
Note: when the unit is switched on, if the room temperature is in the neutral zone, the season is considered to be heating.
A first PI heating controller, called the master, calculates a supply setpoint (“set_supply”), taking the following parameters
into account:
• room temperatures Treg,
• 4-pipe setpoint control
109
• proportional band for calculating the supply setpoint
118
• integral time for calculating the supply setpoint
119
.
Speed
100%
152
Extractor fan
10V
Volt
ON
OFF
Tlim
129
Val_lim_max_H
128
126
Control temperature
Supply setpoint
128
118
107
126
Control temperature
Supply setpoint
128
118
108
126
Control temperature
Supply setpoint
128
118
109
ON
OFF
Tlim
129
Val_lim_min_H
126
150
153
151
Supply fan
Speed
100%
150
Extractor fan
10V
Volt
152
151
153
Supply fan
Speed 1
Ambient CO2
Fan
Speed 3
I56
I55
Outdoor temp
Setpoint offset
I34
I32
I35
I38
I39
I33
I36
I37
Supply temp.
OUTH
100%
HEATING
modulating
114
116
123
Supply
setpoint
COOLING
modulating
0%
Treg
HEATING
COOLING
100%
0%
Treg
122
124
WCS
100%
0%
Treg
OUT
124
WCS
114
AOx
DOx
DOx
126
Control temperature
Supply setpoint
128
118
Set_reg
Control temperature
HEATING
I24
COOLING
Set_comp
Speed 1
Humidity
Fan
Speed 3
I42
I41
AOx
ON
OFF
Tlim
129
Val_lim_max_C
128
ON
OFF
Tlim
129
Val_lim_min_C
126
DOx
DOx
OUT
WHS
WCS
Treg
HEATING
COOLING
109
I23
I23
OUTC
Supply temp.
OUTH
100%
Modulating
HEATING
114
123/2
Supply setpoint
0%
Supply temp.
100%
116
Supply setpoint
Modulating
COOLING
0%
OUTC
123/2
118
:
proportional supply band
109
:
4-pipe setpoint control