5
22mm Cold feed connections.*
22mm Boiler flow and return.*
(indirect versions only).
22mm Hot water draw off connections.*
Immersion Heater (two on direct versions).
Position for cylinder thermostat.
Pressure Temperature Relief Valve.
Secondary return - STD on 200 - 300 litre models.
*Connections 1, 2, 3 & 7 are plain pipes and require
compression fittings (not supplied)
Components supplied for fitting on site:
Inlet Control Group
(comprising of a pressure reducing
valve set to 3.0 bar, single check valve, filter and
expansion valve set to 5.0 bar).
Cylinder thermostat (indirect models only). Factory Fitted
Energy cut out valve
(indirect models only).
Tundish.
Integrated into case of Tornado Stainless. Supplied for site fitting
with Tempest Stainless.
Expansion vessel (8 litre on 90 litre models, 1
2 litre on 125 & 150 litre models,
18L on 170 & 200 litre models, and 24 litre on 250 & 300 litre models).
To prevent damage to the coil and cylinder connections, make all soldered
joints before connecting pipework to the Tornado and Tempest Stainless.™
Position the unit vertically and make the incoming cold water connection
to the fitting labelled “mains water inlet”. For commissioning and later
maintenance purposes it is essential to fit a service valve immediately
before the connection to the Inlet Control Group.
Installing the Inlet Control Group
The incoming cold water should first pass through the pressure reducing valve, which reduces the
pressure to 3.0 bar - this is factory set and should not be adjusted - and then through the
expansion valve (factory pre-set to 5.0 bar). The Inlet Control Group also includes a single check
valve and filter.
*NB
Upon commissioning if the incoming pressure is less than 3.0 bar, the expansion vessel
pressure, should be adjusted to 0.2 bar less than the incoming water pressure.
Ensure that the Inlet Control Group is fitted immediately adjacent to the Tornado Stainless™ with
the arrows on the side pointing in the same direction as the flow. It must be no further away than
500mm and have no devices or connections/draw offs between it and the cylinder. Balanced
supplies for showers and mixer taps only should be taken from the appropriate connection on the
Inlet Control Group (see illustration). Water regulations require that a single check valve should be
fitted in the balanced draw off to prevent back flow. The inlet group supplied incorporates a
single check within the body of the group.
The expansion vessel for the Tempest Stainless must be fitted between the inlet control group and
the unit (see illustration)
A suitable means for draining the unit must be incorporated into the cold feed
(see illustration) - Positioning the drain as suggested will allow a minimum of 80% of the
cylinder to be drained off.
STEP 3
(all cylinders)
Inlet group with expansion vessel
position (Tempest only) also shows
drain off position and balanced supply
1
2
3
4
5
6
7
1
2
4
5
2
7
6
3
7
Tornado Stainless
Tempest Stainless
3
6
2
5
4
2
1
NEW TORNADO/TEMPEST 25336 19/4/05 12:25 PM Page 10
