THE CYLINDER
The cylinder must only be installed in the vertical position. The inlet pipe delivers cold water to the bottom of the
cylinder. An unvented kit is provided which comprises of a Flexcon expansion vessel (to accommodate any increase
in water volume), pressure reducing valve and safety group (expansion relief valve, tundish and single check valve.
IMPORTANT - the discharge from the expansion relief valve must be made and piped away safely.
COLD WATER SUPPLY
The mains water pressure must not exceed 12 bar.
As hot and cold water are both drawn off the same supply, it is important to ensure that the cold water feed is capable
of supplying the full demand. Please identify all the connection ports before making any connections to the cylinder
(See diagrams A and B on page 2).
For maintenance, position an isolating valve between the cold water supply and the cylinder.
All pipework must be flushed clean to avoid any damage to the controls.
INDIRECT CYLINDERS
Indirect cylinders are supplied with a 2-port motorised valve in accordance with Water Board regulations G17.1(b),
and have dual thermostatic controls.
A separate cylinder thermostat is supplied to control the indirect circuit via the motorised valve. In accordance with
Water Bye-Law G20.6, and integral thermal cut-out stat is incorporated within the cylinder stat housing, and is wired
through to the heat source, and operates if the water temperature rises too high. Should the thermal cut-out activate it
can only be re-set manually. Under no circumstances should this be by-passed. The activation indicates a fault
which must be rectified by a qualified engineer. Refer to diagram E on page 8 for recommended wiring details.
IMMERSION HEATERS
The cylinder immersion heater(s) are connected through a thermostat which pre-sets the operating temperature. The
required operating temperature can be adjusted at the head of the thermostat. In accordance with Water Bye-Law
G20.6 the immersion heater is pre-wired through a thermal cut-out stat, which operates if the water temperature rises
too high. Should the thermal cut-out activate it can only be re-set manually. Under no circumstance should this be
by-passed. The activation indicates a fault which must be rectified by a qualified engineer. Refer to diagram G
on page 9.
FITTING THE IMMERSION HEATER(S)
The electrical installation must be in accordance with the current I.E.E. wiring regulations.
Care must be taken not to cross thread the immersion heater(s) when fitting.
A 220/240V mains supply fused 13 amp is required. Heat resistant cable, round 3 or 4 core 2.5mm
2
(to BS.6141.
table 8) must be used to connect the electrical supply through the Economy 7 time control switch as shown in
diagram G on page 9.
If the Economy 7 system is not used then a separate 13 amp supply to each element will be required through a
double pole fused isolating switch having a contact gap of at least 3mm on each pole. Make the connection(s) to the
immersion heater(s).
The thermostat(s) on the immersion heater(s) should be adjusted to trip at 60
O
C. This is the ideal temperature to
prolong the element’s life in hard water areas. Scale on the sheath builds up more rapidly at temperature above 60
O
C
causing the element to overheat and premature failure could occur. Higher temperatures without additional controls
would result in scalding.
WARNING: THE APPLIANCE MUST BE EARTHED
The earth continuity conductor of the electrical installation must be effectively connected to all exposed parts of other
appliances and services in the room where the unvented cylinder is housed - conformity with the I.E.E. regulations.
SITING THE UNVENTED CYLINDER
As the unvented cylinder is connected directly to the mains cold water supply, the siting is optional. However, for easy
maintenance leave free space for access to the electrical components (immersion heater(s) and anodes). Care
should be taken to ensure the support of the load bearing strength as per the table below.
Supastor Size
Weight full Direct unit
Weight full Indirect unit
300 litre
356 kg
376 kg
250 litre
305 kg
322 kg
210 litre
255 kg
272 kg
180 litre
223 kg
234 kg
150 litre
192 kg
203 kg
120 litre
173 kg
181 kg
3
10
Expansion
vessel
To Drain
To Discharge
Safety
group
Cold
mains
in
6 bar expansion
relief valve
3 bar PRV
Heating
flow
Heating
return
Hot water
supply
Schematic diagram of Supastor Indirect unvented hot water controls.
Diagram H.
NOTE:
All components must be fitted.
If the system is to be fitted with a 3 port valve, the 2 port valve supplied by Flamco must still be fitted.
(As diagram C
on page 8).
