6
*
Maximum Flue Lengths (includes first bend onto boiler flue connection for horizontal installations)
*
Max. flue length 80/125 concentric (room sealed)
m
*
Max. flue length 80 single pipe (B23 open flue)
m
Flue system (optional)
Concentric flue
mm
Hole in wall required mm
Flue system (as supplied)
Open flue
mm
Hole in wall required mm
11
28
80/125
127
80
100
8
14
80/125
127
80
100
5
8.5
80/125
127
80
100
14.5
30
80/125
127
80
100
Pro Tec 115
Pro Tec 50 Pro Tec 70 Pro Tec 90
Open flue -
Maximum horizontal or vertical flue with single 80 mm dia. according to Table above
90° bend is equivalent to 2.1 m of flue length
45° bend is equivalent to 1.3 m of flue length
Vertical terminal is equivalent to 2 m of flue length
Concentric flue -
Maximum horizontal flue or vertical flue according to Table above
90° bend is equivalent to 1.9 m of flue length
45° bend is equivalent to 1.4 m of flue length
Vertical terminal is equivalent to 2 m of flue length
Notes: 1.
Ensure all flues slope downwards towards the boiler by a minimum of 25 to 30 mm per metre of flue.
2.
It is recommended that horizontal and vertical flue assemblies should be supported approximately every 1.5 m with
access provided to the joints.
3.
These dimensions only apply for flue parts supplied by Alpha.
Cascade flue options are also available, please contact Alpha for further details.
2.4 FLUE DATA
2.5 AVAILABLE PUMP HEAD
Fig. 2.1
The Pro Tec boilers are fitted with a 3 speed pump. The boiler does not operate correctly with the pump set at the slowest
speed. To ensure optimal boiler operation, especially in the case of new systems it is recommended that the pump is set to
maximum speed.
The following graphs indicate the pump head and flow rates available at the maximum speed setting (
A
) and the middle
speed setting (
B
).
Pump release:
If, after a prolonged period of inactivity, the pump is sticking, unscrew the front cap and turn the motor shaft
using a flat bladed screwdriver. Take great care during this operation to avoid damage to the motor.
For larger systems an additional external pump can be fitted and controlled by the boiler using a relay switch. See Fig. 2.5.
A
B
1.0
2.0
3.0
4.0
5.0
6.0
0
Flow rate (l/h)
Head
(m water)
800
850
1000
1100
1200
1300
1400
1500
1600
1700
1800
900
Pro Tec 50
Alpha Pro Tec - Data