Boiler Installation Information
NOTE
The presence of ‘pumping over’ in an open
vented heating system connected to the Grant
Vortex boiler will invalidate the product
guarantee.
OPEN VENTED SYSTEMS:
Open vented systems must be correctly designed and installed.
The open safety vent pipe must be positioned to prevent ‘pumping
over’ (i.e. the discharge of water from the open safety vent pipe
into the feed and expansion cistern under the pressure created by
the circulator).Failure to do so can cause oxidization to occur and
invalidate the warranty. For detailed information on the correct
design of open vented heating systems, and the correct location
of the open safety vent pipe, refer to the CIBSE Domestic Heating
Design Guide and OFTEC Technical Book 4 (Installation).
4.5 PIPEWORK MATERIALS
The Grant Vortex boiler is compatible with both copper and plastic
pipe. Where plastic pipe is used it must be of the oxygen barrier
type and be the correct class (to BS 7291-1) for the application
concerned.
On either sealed or open-vented systems; where plastic pipe is
used a minimum of ONE metre of copper pipe (or as per pipe
manufacturers instructions) MUST be connected between both the
boiler fl ow and return connections and the plastic pipe.
NOTE
Do not connect plastic pipe directly to the
boiler.
Grant IRL does not accept any responsibility for any damage,
however caused, to plastic piping or fi ttings.
SEALED SYSTEMS
If plastic pipe is to be used, the installer must check with the plastic
pipe manufacturer that the pipe to be used is suitable for the
temperature and pressures concerned.
Plastic pipe must be Class S to BS 7291-1.
WARNING
When plastic pipe is used, the system MUST
incorporate a low pressure switch to shut off
power to the boiler if the system pressure
drops below 0.2 bar. A suitable low pressure
switch kit is available to purchase from Grant
IRL (product code: ZPRESSURESWITCH).
UNDERFLOOR PIPEWORK
Plastic pipe may be used on underfl oor fl oor systems where the
plastic pipe is fi tted after the thermostatic mixing valve. Copper
tube must be used for at least the fi rst metre of fl ow and return
primary pipework between the boiler and the underfl oor mixing/
blending valves.
4.6 CONNECTIONS
4.6.1 FLOW AND RETURN CONNECTIONS
Refer to Section 5.
4.6.2 CONDENSATE CONNECTION
Grant Vortex boilerhouse combi boilers are supplied with a factory-
fi tted condensate trap to provide the required 75 mm water seal in
the condensate discharge pipe from the boiler.
Refer to Section 6 for details of the condensate disposal pipework.
4.6.3 DRAIN COCK
A drain cock is fi tted at the bottom on the front of the boiler to allow
the heating system to be drained.
4.7 PREPARATION FOR INSTALLATION
1. Carefully remove the packaging from the boiler and remove it
from the transit pallet.
2. Pull the front panel forward at the top to disengage the fi xing
clips then lift it up and off the boiler. Remove the literature
pack.
3. Lift off the case top panel(s) and remove the water connecting
fi ttings.
4.8 INSTALLING THE BOILER
1. Having decided upon the position of the boiler and type of
fl ue, prepare the wall as described in Section 9. Ensure that the
fl ue terminal position complies with the necessary clearances.
2. Make the water connections as described in Section 5.
If access will be restricted, make any connections to the
boiler before placing it in its fi nal position. Refer to Section
7 if the boiler is to be used on a sealed system. Ensure the
requirements are met for the disposal of condensate as
described in Section 6.
3. Connect the power supply as described in Section 8.
4. Connect the fl ue and ensure there is an adequate air supply as
described in Section 9.
4.9 FILLING THE HEATING SYSTEM
Refer to Section 7.2 (Filling the Sealed System)
Page 17
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