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1. General information
1.1 Health and Safety regulations
Handling Operations Regulations 1992 defines manual handling as: "any transporting or supporting of a load (includ-
ing the lifting, putting down, pushing, pulling, carrying or moving thereof) by hand or bodily force" The Regulations set
no specific requirements such as weight limits. However common sense still has to be used based on an ergonomic
approach for each individual.
The PAW cylinder should be transported and stored in a vertical position.
1.2 Siting the PAW cylinder
There are few restrictions on the siting of the PAW cylinder, however it should not be sited anywhere open to frost
attack. The unit should be placed on a stable flat surface capable of withstanding the weight of the cylinder when full
(see technical data on page 11) and access must be allowed for maintenance purposes. Provision should also be al-
lowed for the routing of the discharge pipe away from the cylinder to an outside point according to building regulation
G3. (See page 10).
1.3 Component Check list
Components supplied with the unit in a separate accessory kit for site fitting:
•
Multibloc valve, includes pressure reducing valve, line strainer, balanced cold water take off, (for shower or bidet
only) check and expansion valve.
•
Tundish
•
3/4'' x 22mm Elbow / Drain Cock
•
Motorised valve
•
Expansion vessel.
1.4 Components factory fitted
•
Immersion heater with thermostat and thermal cut-out
•
Additional cylinder thermostats with thermal cut-out (for indirect heat source)
•
Temperature and pressure relief valve.
1.5 Documentation supplied
•
Installation manual & log book
1.6 Supply requirements
An uninterrupted 22mm cold water mains supply is recommended, however if only a 15mm supply is available, this
may be used provided there is sufficient flow rate available, a minimum standing pressure of 2.5 bar and a flow rate of
20 litres per minute with a 1bar dynamic pressure is recommended. The cylinder will operate at lower pressures and
flow rates however the performance will be compromised. The PAW unvented unit is designed for use with supply
pressure up to 10 bar. For pressures over 10 bar an additional pressure reducing valve must be fitted in the supply
pipe to the unit.
1.7 Expansion vessels
The vessel accommodates expanded water when the cylinder is heated and prevents the cylinder reaching its maxi-
mum working pressure.
1.8 Compatible fittings and components
All thermostatically controlled heat pumps and boilers are compatible with indirect PAW cylinders.
Heat sources to unvented hot water cylinders must be controlled by a thermal cut-out as well as a thermostat. The
PAW cylinders is supplied with sensor bosses and pockets to house temperature sensors linked to the heat pump or
boiler.
1.9 Non-compatible products.
Solid fuel boilers, wood burning stoves and other non-thermostatically controlled heat sources must not be used with
unvented cylinders.
2
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