Alpha E-Tec Plus 28NX - Page 44

Main display based on parameter t.9
DHW only
CH only
DHW + CH
0
1
2
0
1
2
0
1
2
Always off
Always off
Always off
Always displays the CH set point
Pump On in CH - Displays the flow
temperature
Pump Off - Displays the CH set point
Always displays the CH set point
Always displays the CH set point
Pump On in CH - Displays the flow
temperature
Pump Off - Displays the CH set point
Always displays the CH set point
Always off
Pump On in DHW - Displays the flow temperature
Pump Off - Displays the DHW set point
Always displays the DHW set point
Always off
Always off
Always off
Always off
Pump On in DHW - Displays the flow temperature
Pump Off - Displays the DHW set point
Always displays the DHW set point
Operating
mode
Display
configuration (t.9)
DHW CH
Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning
ID
Parameter Description Range
0 - 3
-
A3 - 9
1 - A2
0 - 25
-
-
0 - 1
0 - 1
0 - 1
00 - 12
(0 - 1.2 bar)
15 - 35
(1.5 - 3.5 bar)
DHW hydraulic
selection
DHW flow rate
regulator
Max. pump speed
Min. pump speed
Pump mode
Not used
Not used
DHW thermostat
System automatic
vent
Pressure sensor/
pressure switch
selection
Minimum system
pressure value
(bar/10)
Maximum system
pressure value
(bar/10)
A.0
A.1
A.2
A.3
A.4
A.5
A.6
A.7
A.8
A.9
A.10
A.11
Default
0
-
9
6
15
-
-
0
1
1
4 (0.4 bar)
30 (3 bar)
0 - Instantaneous
1 - Instantaneous with flow rate regulator
2 - Storage tank
3 - Not used
Not used
Defines the maximum operating speed of the pump.
(If A1 = A2, pump operating at set speed)
Defines the minimum operating speed of the pump.
It is recommended not to enter values lower than 6
Defines the operating mode of the pump:
T = 0 Proportional head (Section 3.4)
T = 5 - 25K - T constant (Section 3.4)
-
-
Establishes the switch off method in DHW mode:
0 - Fixed, the switch off temperature is fixed at the maximum
value regardless of the value set on the control panel
1 - Correlated, the boiler switches off according to the
temperature set
Enables the automatic vent function. This function activates as
soon as the unit is powered
0 - Disabled
1 - Enabled
Selects the system pressure detection mode:
0 - Do not use
1 - Pressure switch
Value below which the fault "E10" (Insufficient system pressure)
is signaled
Value above which the fault "E146" (System pressure too high)
is signaled
Customised
value
44