Alpha InTec2 20SE Installation And Servicing Instruction page 5

2.2 PHYSICAL DATA
Boiler flow and return connections
Gas connection diameter
Boiler dimensions
Clearances for servicing
Recommended hole size for flue pipe
Recommended hole size for instalation from inside the building
Boiler dry lift weight
Boiler operating weight (full of water) approx.
Max. total flue length
Max. total flue length
Flue system diameter
2.3 FLUE LENGTHS
A 500 mm or 1000 mm Easy-Flue terminal kit with 90° bend or horizontal terminal is available.
CD 750 mm and 1000 mm flue extensions are available.
Length of Flue Required:-
Rear Flue = wall thickness + 180 mm (includes terminal).
Side Flue = wall thickness + distance between wall and side of boiler + 265 mm (includes terminal)
Vertical Flue = distance from top of boiler side panel to required roof position minus 1000 mm for vertical terminal assembly
Maximum horizontal flue length = 12 m.
Maximum vertical flue length including terminal is 14 m.
Each additional CD 90° Bend is equivalent to 1.3 m of flue length.
Each CD 45° Bend is equivalent to 0.9 m of flue length.
The CD Vertical Flue terminal assembly is equivalent to 1 m of flue length.
Note: For flue lengths over 4.5 m the 'F0' parameter should be changed - See Section 5.4.
2.4 PUMP
The boiler is equipped with a variable speed low power consumption pump.
During the DHW mode, the pump always runs at the maximum speed.
During the CH mode, different functioning modes of the pump are available.
Δ
AUTO - CONSTANT T (Default): The pump speed is controlled automatically to keep a constant
and return according to the
Parameter A5 adjusts the
Δ
Note: A constant
T may not be achievable depending on the heating system design and size.
AUTO - PROPORTIONAL: If
pump head, the pump speed varies based on the heat output supplied by the burner - the greater the heat output the higher the
pump speed. It is possible to adjust the pump speed range in the boiler parameter menu. Parameter A3 adjusts the maximum
speed between values 5 to 9 and parameter A4 the minimum between 5 and the maximum setting (A3).
FIXED - If parameters 'A3' and 'A4' are set to the same value, the pump runs at the constant speed level set.
Note: For correct operation of the boiler, do not set values lower than the minimum value indicated above (i.e. lower than 5).
Pump release - After a prolonged period of inactivity, the pump might stick, and it may be necessary to turn the motor shaft
using a screwdriver. Take great care during this operation to avoid damage to the motor.
By-pass Regulation (part. 24 Fig. 1-30) - The boiler leaves the factory with the by-pass open.
If necessary, the by-pass can be adjusted to the system requirements from minimum (by-pass closed) to maximum (by-pass
open). Adjust using a flat head screwdriver, turn clockwise to open the by-pass, and anticlockwise to close.
Height
Width
Depth
Bottom
Bottom (with jig)
Top (horizontal flue)
Top (vertical flue)
Sides
Front
Horizontal
Vertical
Δ
T set (default value 15°C). It is possible to adjust the
Δ
T between 5 and 25°C.
Δ
T = 0°C (parameter A5), the pump speed is controlled automatically in order to give a proportional
mm 22
mm 22
mm 712
mm 440
mm 276
mm 150
mm 250
mm 235
mm 150
mm 5
mm 450
mm 110
mm 130
kg 32
kg 33.9
m 12
m 14
mm 60/100
Δ
T value in the boiler parameter menu.
Alpha InTec² 20SE and 30SE - Technical Data
Δ
T between heating flow
5