Heat Exchanger; Flue System; Water Connections - andrews ECOflo Series Installation And Service Manual

3 Installation
3.7

Heat exchanger

3.8

Flue system

3.9

Water connections

18
Burner fires down into 8" diameter flue tube transferring the
radiant heat from the burner flame into the tank water.
1st Pass Flue Collector: At the bottom of the tank, a refractory
lined heavy gauge flue collector re-directs the flue gases from
the 8" flue tube to pass through two 4" diameter flue tubes to the
top of the tank.
4" diameter flue tubes have stainless steel baffles to turbulate
the flue gases to improve heat transfer.
2nd Pass Flue Collector: At the top of the tank, the flue gases
from the 4" flue tubes collect in a heavy gauge steel collector to
redirect the flue gases down eight 2" diameter flue tubes.
2" diameter flue tubes are glass lined on the inside as well as
outside to prevent corrosion from flue gas condensate. Stainless
steel flue baffles inside the 2" flue tubes turbulate the flue gases
to aid heat transfer. Flue temperatures are reduced from 260-
340°C from the second pass collector to 54°C or less in the flue
exhaust.
3rd Pass Collector: The flue gases from the bottom of the 2" flue
tubes are collected at the bottom of the tank in a stainless steel
flue collector, where the exhaust gases and condensate exit out
through a short Stainless Steel pipe extending outside the jacket
that connects to the coaxial concentric flue system.
A condensate tee with a silicone seal is connected to the plastic
exhaust pipe and interfaces with the flue system. The tee
connection has a 32mm condensate drainpipe connection to
allow the siphon to be fitted. The waste pipe will then be taken
from the siphon outlet to drain.
A section of aluminium flue pipe will run to the top of the water
heater to connect to the air intake tee.
The intake tee adapts to the concentric flue pipe and has an
elbow to connect to the combustion air intake pipe.
The 100/150 mm dia. Andrews' concentric flue pipe will then run
to the horizontal or vertical flue terminal.
Maximum concentric flue for this product is 16 metres. Each
additional 90° elbow is equivalent to a reduction of 1.2 metres of
straight flue pipe.
Each additional 45° elbow is equivalent to a reduction of 0.7
metres of straight flue pipe. If a condensate trap is installed, this
is equivalent to a reduction of 1.5 metres of straight flue pipe.
Front hot and cold 1½" BSP (male) water supply connections.
Issue 2 14/07/16