18
Grant Vortex Outdoor Module
4 - GENERAL BOILER INFORMATION
See Fig. 11
On underfloor systems it is essential that the return is
pre-heated by mixing flow water into the return before
it enters the boiler. The return temperature must be
maintained above 40°C to prevent internal corrosion
of the boiler water jacket.
Fig. 11 - Underfloor system
Underfloor heating systems
4.14
Condensate disposal
4.15
The minimum diameter of the condensate drainage line
is 3/4". The drainage line may run into a soil stack or
waste pipe, an external gulley, hopper or soak-away,
see Fig. 13. Standard plastic overflow pipe (3/4" [19
mm] diameter) may be used to connect to the outlet of
the condensate trap.
It should be noted that the connection of a condensate
pipe to the drain may be subject to local building
control requirements.
Fig. 12 - Condensate trap
When in condensing mode the Grant Vortex boiler
produces condensate from the flue gases. Provision
must be made for the safe and effective removal of the
condensate. All Vortex boilers are supplied with a
float valve condensate trap (the float creates a seal
against flue gases), see Figs. 9 and 12, that
incorporates an overflow warning outlet. The bung
should be removed from the overflow outlet.
The trap must be located inside the casing in an
accessible position to allow for maintainance.
The mounting bracket (supplied) for the condensate
trap must be used.
The trap should be checked at regular intervals to ensure
that it is operating correctly and serviced at least annually.
If there is any discharge of condensate from the overflow
outlet, turn off the boiler and contact a service engineer.
The condensate drainage line must be of a suitable material
such as plastic.
Steel or copper must not be used.
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