9
Preparing To Install the Cylinder
Access
Consideration should be given to the position of discharge
pipes (tundish) drain valves. Avoid positioning these too close
space so that the cylinder can be inspected, maintained and
serviced in the future.
The immersion heaters are 410mm long and care should
be taken to ensure that they can be withdrawn, enabling the
immersion heater to be replaced at the end of its working life
and providing inspection access to the interior of the cylinder
in servicing if required. The discharge pipework from the
safety valves should fall continuously and terminate safely.
AAV’s
Additional automatic air vents (AAV) (not supplied) may be
required at high points in the primary system where pipework
system (primary circuit), release all trapped air using air vents
during and following heating period and top up with water as
necessary. After removing the air, automatic air vent(s) MUST
be closed.
Flushing the heating system
(Retrot installations)
Part L of the 2022 Building Regulations require that all central
heating systems are cleaned and dosed with protective
as the heat pump, to protect the equipment from damage.
Ecodan heat pumps also require anti-freeze protection.
Failure to do so will put the product Warranty at risk.
Turn to test
Cold water combination valve Cold
Mains In
Expansion Relief
to Tundish
Balanced Cold
Connection
Outlet to Cylinder
Cold mains pipework
Option 1: Run the cold mains through the building to the place
where the unvented cylinder is to be installed.
Option 2. Where local Building Regulations do not permit
the cylinder to be connected directly to mains supply, run the
cold feed from a cold feed break tank using a suitable pump
to boost pressure. The pump MUST be used in conjunction
with a sensor in the feed tank to ensure tank does not drain
empty and pull air. Take care to prevent heat pick-up by not
running the cold pipe near hot water or heating pipework. This
(not supplied). We recommend using a full bore quarter turn
ball valve; alternatively a stopcock can be used, however this
similar service valve.
Make the connection to the cold feed of the cylinder with
the cold water combination valve positioned above the
Temperature & Pressure Relief Valve (TPRV) mounted on
the side of the cylinder. This ensures that the cylinder does
not have to be drained down in order to service the cold
water combination valve. Ensure that the arrow points in the
Select a suitable position for the potable water expansion
vessel. Mount it to the wall using the bracket attached to the
weight (and with appropriate consideration to wall material).
Connect the expansion vessel to the cold feed pipework
between the cold water combination valve and the cold inlet
on the cylinder. Ensure that the top of the vessel is accessible
for servicing.
Cylinder connections
The cylinder should be plumbed in using BS EN1057-R250
copper tube. Cut the tube square using a rotary tube cutter
and ensure no sharp edges or burrs protrude. Slide both
gland nut and olive onto the tube and push tube fully home
into the connection, ensuring the tube end fully bottoms on
the connection recess. Smear the outer wall of the olive with
plumbing paste and tighten the gland nut in the prescribed
manner.
Alternatively, if you are using imperial pipework, you may
the BSP thread on the cylinder boss.
completely watertight, including bosses and any pre-plumbed
components.
the expansion relief valve and the storage cylinder. The relief
valve connections should not be used for any other purpose.
Installation Instructions - Unvented Cylinders
