Page 10
INSTALLATION
INST
ALL
A
T
ION
General Design Considerations
The cupboard footprint needs to be at least
650mm square.
The base chosen for the cylinder should be level
and capable of supporting the weight of the unit
when full of water as shown in General Data. The
discharge pipework for the safety valves must have
a minimum fall of 1 : 200 from the unit to a safe
discharge point. All exposed pipework should be
insulated and the unit should NOT be fi xed in a
location where the contents could freeze.
The pipe connecting the boiler fl ow to the
appliance must not be less than 22mm copper
or equivalent.
Mains Water Supply
Existing properties with a 15mm supply will be
satisfactory provided the local mains pressure
is good, but should be confined to single
bathroom properties. For new properties where
simultaneous demand is required to more than
one bathroom or a bathroom and one or more
en-suites, the communication and service pipe
into the dwelling should be a minimum of 22mm
(usually in the form of a 25mm MDPE supply).
The minimum recommended static pressure
to operate a Stainless Lite domestic system is 3
bar. There should be a fl ow of at least 30 litres
per minute or above available into the property.
Normally Stainless Lite provides well in excess
of 40 litres/min in most conditions. Flow rates
for ALL mains pressure systems are subject
to district pressures and system dynamic loss.
Particularly on larger properties with more
than one bathroom, the pipe sizes should be
calculated in accordance with BS6700.
Model Selection
The suggested Direct model sizes, shown
opposite, are based on a typical days hot water
use assuming an Economy 7 tariff is provided.
A reduction of one model size can normally be
made with an Economy 10 tariff.
When using the Direct models for high
specifi cation developments an increase of one
model size should be considered.
Where selecting a solar model, it is important to
check the dedicated solar volume (shown in table
1 on page 7) is suitable for the total fl oor area of
the dwelling to ensure compliance with Building
Regulations. The maximum fl oor area of the dwelling
permitted for the models is shown opposite.
The suggested model sizes are based on
typical hot water usage. For high specifi cation
dwellings an increase of one model size should
be considered.
I.V.
Combination Valve
I.V.
Model Selection Guide
Max hot water demand
Max number
of bed spaces
(Bedrooms)
Indirect
litres
Direct
litres
1 shower room
Bedsit (0)
90
120
1 bathroom
2 (2)
120
150
1 bathroom
4 (3)
120
180
1 ba separate shower room
6 (4)
150
210
1 ba 2 separate shower rooms
or 2 bathrooms
7 (5)
180
210
2 bat separate shower room
7 (5)
210
250
2 bat 2 separate shower rooms
7 (5)
250
300
3 bat 2 separate showers rooms
9 (6)
300
-
If two Stainless Lites are coupled together the secondary inlet and outlet pipes must
be balanced. The units must be fi tted on the same level.
Note: No valves must be fi tted between the expansion vessel and the storage cylinder(s).
Solar Model Selection Guide
Max hot water demand
Max fl oor
area (m
2
)
Bedrooms
Indirect
litres
Direct
litres
1 shower room
44
Bedsit
-
180
1 bathroom
44
1-3
180
-
1 bathroom
66
1-3
210
1 ba 1 shower room
66
1-3
210
-
1 ba 1 shower room
84
1-3
-
250
1 ba 2 shower rooms
84
2-4
250
-
1 ba 2 shower rooms
113
2-4
-
300
2 bat 1 shower room
113
3-4
300
-
Summary of Contents for Stainless Lite Direct 90-300 litres
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