Winterwarm XR - Flue Length (Max.); Condensate in the Flue System

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INSTRUCTION MANUAL AIR HEATER TYPE XR
5.1.1 Flue material
Only use CE marked flue material from the manufacturers
Muelink & Grol (M&G) and Burgerhout.
Use type Alu-fix with a minimum temperature class of
T250 P1.
Use flue pipes with the same diameter as the flue spigots
on the heater.
Contact your supplier to purchase these flue materials.
NOTICE Dierent manufacturers use dierent
connections systems for flue pipes. Do not combine
systems from dierent manufacturers.
5.2 Flue length (max.)
The maximum straight length between the air heater and
its flue terminal for both orientations is:
• Horizontal & vertical: 9 meters.
Bends that are used in the connection between an air
heater and the flue terminal cause a decrease in pressure:
• Using a 90° bend decreases the maximum length
of the connection by 2 meters.
• Using a 45° bend decreases the maximum length
of the connection by 1 meter.
For further information regarding the flue system, please
contact your supplier.
5.3 Condensate in the flue system
Condensate can form in the flue system when the air
heater is heating up. This condensate will evaporate if the
heater is operating for a longer period of time. The forming
of condensate depends on the following factors:
5.3.1 Air heater type
Condensate is especially likely to form in the smaller
heaters (< 25 kW).
Condensate will most likely not form in the larger heaters
(> 25 kW).
5.3.2 Air heater location
When an air heater burns frequently and is placed in
a normally heated room (temperature above 15 °C),
condensate is unlikely to form.
Air heaters placed in a room that needs to be just above 5
degrees will only burn for short periods at the time. Formed
condensate will not evaporate in these short burning
periods. The condensate will accumulate and eventually
result in pressure switch errors. To prevent this:
• Add a T-piece (figure 17).
or
• Add a condensate drain (figure 17).
5.3.3 Flue pipe length
When the flue pipe is long and runs through a cold space,
condensate can form. If the straight length of the flue pipe
is longer than 4 meters, the condensate will not evaporate
and accumulate in the heater. In this case. To prevent this:
• Insulate the flue pipes.
or
• Place a condensate trap (figure 18).
T-piece (6) Condensate
trap (7)
Condensate
drain
Ø80 art. IA8223 IA8225 IA8286
Ø100 art. IA8176 IA8188 IA8288
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Figure 17- A T-piece (6) and condensate trap (7)