andrews FASTflo WH42 Installation Manual, Operation And Maintenance Manual page 18

M&G VERTICAL FLUE TERMINAL
• Use only the following models of the flue terminals with this unit.
• The M&G Vertical Flue Terminal can be cut to suit the roof.
Roof thickness
50 mm to 500 mm
Flue system installation example
hangers
Elbow
Straight pipe
Intake pipe
Special
adapter
Seal any connections that
are not gas tight using a
high temperature silicone
sealant.
Flue Precautions
• Use 100mm diameter flue pipe.
• Maximum flue length
4 elbow (90 degree) +
7m (flue pipe) + Flue Terminal
1 elbow (90 degree) +
12m (flue pipe) + Flue Terminal
• Minimum flue length
1 elbow (90 degree) + Flue Terminal
• Exceeding the maximum flue length is danger-
ous and may result in bad combustion.
• Maximum 90 degree bends not to exceed 4.
• Maximum length must be reduced by 2000mm
for each 90° bend used.
• Maximum length must be reduced by 1000mm
for each 45° bend used.
• If possible, don't install the flue pipe through
any enclosed areas. If necessary, consult
ANDREWS WATER HEATER for clearances.
• Install the flue terminal so that all exhaust is
directed to and all intake air is taken from
outdoors.
14
Flue Terminal
Exhaust
Elbow
pipe
Main unit
Page 14
Flue system installation example
hangers
Intake pipe
Special adapter
Seal any connections that
are not gas tight using a
high temperature silicone
sealant.
• Do not store hazardous or flammable sub-
stances near the flue terminal.
• Slope the intake and exhaust pipes at a 1/50
grade down towards the termination.
• Connect the flue pipe firmly so that it will prevent
exhaust gases from leaking.
• Steam or condensed water may drip out of the
flue terminal. Dispose of this condensed water
according to local codes and in order to prevent
injury or property damage.
• Fit condensate trap and siphon to flues over 2m high.
• If this product will be installed in an area where
snow is known to accumulate,protect the flue ter-
mination from blockage by snow drifts or dam-
age from snow falling off of roofs.
• Support the flue pipe with hangers at intervals.
• Install the flue terminal so that it is easily acces-
sible for maintenance both from the indoors and
the outdoors.
• If the flue terminal will be installed higher than
the water heater,make the vertical section di-
rectly above the water heater as short as
possible,and slope down to the terminal. Do not
have another vertical section after the horizontal
section begins.
• Make the vertical pipe as short as possible.
05.9.28, 3:33 PM
Flue Terminal
Straight pipe
Exhaust pipe
Special adapter
Main unit