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4.4 Condensate Drain
The condensate drain connection is at the bottom of the product, see Diagram 4.2. Connect the
product condensate drain to the condensate drain hose which is contained in package box. The
condensate drain hose is 20mm internal diameter (22mm external diameter for any pipework
installed external to the property) and is made of a suitable acid resistant material.
The discharge pipe from the boiler condensate drain must have a continuous fall (45mm per
meter) away from the product and preferably be installed and terminated within the building to
prevent freezing.
The condensate discharge pipe must terminate in a suitable position, e.g.:
a) Preferably the condensate pipe should be run and terminate internally to the house soil
and vent stack (at least 450mm above the invert of the stack). A trap giving a water seal
of at least 75mm should be incorporated into the pipe run, and there must be an air break
in the discharge pipe upstream of the trap. This should be designed so that the
condensate cannot be discharged into the house if the condensate pipe becomes blocked.
b) Connecting into the internal discharge branch (e.g. sink waste or washing machine)
with an external termination, the condensate discharge pipe should have a minimum
diameter of 22mm with no length restriction and should incorporate a trap with a 75mm
seal. The connection should preferably be made down stream of the sink waste trap. If
the connection is only possible upstream, then an air break is needed between the two
traps. This is normally provided by the sink waste.
c) Terminating in a gully below grid level and above the water level. The external pipe
length should be kept a short as possible to minimize the risk of freezing and should not
be more than 3m.
f) At a condensate absorption point (soakaway). The external pipe length should not be
more than 3m
g) The disposal of condensate liquid must comply with local Water Authority rules and
regulations.
Navien stirling engine m-CHP installation manual
Diagram 4.2 Condensate drain connection
Condensate drain
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