Alpha InTec2 25XE Installation And Servicing Instruction page 5

2.2 PHYSICAL DATA
Boiler flow and return connections
DHW inlet (cold) DHW outlet (hot) 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, two different functioning modes of the pump are available, AUTO and FIXED.
AUTO - The pump speed is controlled automatically in order to give a proportional 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 the 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.
mm
mm
mm
Height mm
Width mm
Depth mm
Bottom mm
Bottom (with jig) mm
Top (horizontal flue) mm
Top (vertical flue) mm
Sides mm
Front mm
mm
mm
kg
kg
Horizontal m
Vertical m
mm
22
15
22
712
440
276
150
250
235
150
5
450
110
130
35.8
39
12
14
60/100
Alpha InTec² 25XE and 28XE - Technical Data
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