6
STEP 4
(all cylinders)
Connect the discharge pipework and tundish to the valve labelled “P&T” The tundish should be
connected to the cylinder using 15mm metal pipe.
The tundish (supplied) must be fitted within 500mm of the outlet of the P&T valve and have at least
300mm of straight metal pipe below it, before any elbow or bend.
The pipework below the tundish should be fitted in accordance with the current edition of the
Building Regulations
(see page 7). As a minimum this must be 22mm on all Tornado and Tempest
Stainless™ models.
The discharge from the expansion valve on the Inlet Control Group must be connected into the
discharge pipe work.
For good practice purpose a double check valve should be fitted to the hot water draw off to
prevent any back pressure.
STEP 5
(indirect cylinders only)
Connect the boiler flow and return to the labelled connections. Before making the connections
ensure that the coil is free from obstructions by blowing through it.
The Energy Cut Out valve is an essential part of the safety requirements
for indirect mains pressure cylinders and should be installed on the
primary flow to the cylinder with port ‘B’
(embossed on side of valve body)
to the cylinder. The valve will open and close on receiving a signal from
the cylinder thermostat. No further control is required for the hot water
in a two zone valve system.
This valve must also be used in a flow
share (Y Plan) system, in conjunction with the mid-position valve,
to act as a safety cut out valve.
The cylinder thermostat controls the temperature of the hot water and
also acts as an emergency cut out in the event that the boiler
temperature controls fail. The cylinder thermostat is fitted into the
pocket labelled “Store Temp Control” in the cylinder, and should be
connected to operate the energy cut out valve in accordance with the
wiring diagram for the scheme being installed
(see pages 12 and 13).
STEP 6
(all cylinders)
Connect hot water draw off to connection labelled “Hot Water Taps”.
NB: If the secondary circulation system contains more than 15 litres of water a separate
expansion vessel must be provided to compensate for the larger stored volume.
NEW TORNADO/TEMPEST 25336 19/4/05 12:25 PM Page 11
