Grant Combi 70 V3, User'S Installation Manual, Page: 32 / 64

Combi V3, Combi Max and Vortex Combi models 32
Method of operation 5.18
5 - GENERAL BOILER INFORMATION
Fig. 18 - Condensate trap
The trap must be located internally in an accessible
position to allow for routine maintenance. The
mounting bracket supplied with the trap
MUST be
used - the trap should NOT be supported by the
condensate pipework only.
A 22 mm push-fit plastic plumbing connector is
supplied with the boiler to connect the plastic pipe to
the stainless steel condensate outlet pipe - on the left
hand side of the boiler.
Use 22 mm plastic plumbing pipe between the boiler
and the inlet of the trap. Either 22 mm plastic
plumbing pipe or 19 mm (¾") overflow pipe can be
used from the outlet of the trap.
Note: Due to the wall thickness of plastic plumbing pipe, it
may be necessary to chamfer the internal edge of the pipe
before fitting it onto the spigot in the outlet of the trap.
If connecting the condensate discharge internally - into
a waste system or soil stack - the bung must be fitted in
the overflow outlet of the trap.
Fig. 19 - Purpose made condensate soakaway
On external discharge systems to a gully or soakaway,
the bung should be removed from the overflow outlet.
If connected to an external soil stack, the bung must be
fitted on the trap.
If there is any discharge of condensate from the
overflow outlet, this could indicate a blockage
(possibly due to freezing). Turn off the boiler and
contact your service engineer.
Care should be taken when siting the trap such that the
overflow outlet is readily visible and that any condensate
overflowing from the outlet cannot cause either a hazard to
persons or damage to surrounding property or equipment.
IMPORTANT: The trap MUST be checked at regular
intervals (e.g. on every annual service) and cleaned as
necessary to ensure that it is clear and able to operate.
It is recommended that, if there is access to the left hand
side of the boiler, the condensate pipe be connected to the
boiler using a 'tee-piece' and cap to form a 'rodding eye'
- to allow cleaning inside the back of the condensing heat
exchanger via the boiler condensate outlet.
Once the boiler is switched on it will always provide
domestic hot water upon demand. The timer only
controls the operating times of the central heating.
When central heating is not required, the timer switch
should be set to OFF.