11
Flued (internal) water heaters
The HD49kWi and A28i internal water heaters MUST be fitted with a Rinnai
FFSS flue system.
The chart below highlights the maximum flue length and number of bends. It
also shows the difference between a short and long flue.
Flue length
No bends
One bend
Two bends
Three bends
Four bends
1 m
2 m
3 m
4 m
5 m
6 m
7 m
8 m
9 m
10 m
11 m
12 m
13 m
14 m
15 m
Short flue
Long flue
Not allowed
If the flue length falls within the ‘Long flue’ category the flue settings
MUST BE
changed
on the PCB. If this is not done the unit will not operate correctly and may shut down. For
more information refer to p.18, and to the data plate on the side of the appliance.
Condensate
A condensate trap kit (FFSSCOND) is required for flue lengths over 1.5 m. If flueing less than
1.5 m, the flue spigot on top of the unit is capped using the drain cap tube supplied with the unit.
The drain cap is only removed if the condensate kit is connected.
The condensate trap collects any condensate from the flue and prevents condensate from entering
the water heater and causing damage.
Condensate is a by-product of gas combustion and is mildly acidic. For this reason copper tube
and fittings must not be used as it will corrode. Instead Rinnai recommends plastic pipe and fittings
such as UPVC or PE.
IMPORTANT
Summary of Contents for A28i
Page 19: ......
