Installation Guide

3
3
JG Speedfit plumbing
and heating systems
JG Speedfit is a push-fit system suitable for the
plumbing of domestic hot and cold water services and
central heating applications, including pressurised and
combi systems.
The System is approved by the Water Regulations
Advisory Scheme. Speedfit ‘PEM’ fittings and PEX and
Polybutylene Barrier Pipe are Kitemarked to BS7291 Parts
1, 2 and 3 Class S Licence No KM39767.
Performance specifications are well within those
required for most central heating and water supply
systems including:
 Mains fed and indirect cold water systems
 Vented and unvented hot water systems
 Vented central heating systems
 Sealed central heating systems provided
temperatures and pressures comply with
BS7291 Parts 1, 2 and 3 Class S
 Underfloor heating
Extensive tests have shown that Speedfit products will
withstand temperatures and pressures well in excess of
normal working conditions.
Speedfit should be installed to conform with good
plumbing practice.
Speedfit should not be used for gas, fuel oil or
compressed air applications.
Special applications
Boats. The flexibility of the Speedfit system ensures it
can be cabled easily around the interior and hidden
from view.
Caravans. Speedfit is ideal for caravan installations
due to its flexibility and its resistance to corrosion
and freezing.
Exhibitions. The unique ability of the Speedfit system to
be easily demounted and reused, together with its
flexibility, makes Speedfit ideal for this application.
Agricultural and Horticultural. Speedfit has
many applications in agricultural and
horticultural environments.
Portable Buildings (site cabins, toilets). As with
caravans, Speedfit is well suited to this application.
Application
Usual working
temperature °C
Maximum working
temperature °C
Maximum
working
pressure, bar
Cold Water
(indirect and direct
mains)
20 20 12
Central Heating 82
105, short term
malfunction at 114
3
Hot Water
(including
unvented cylinders)
65 95 6
Working temperatures and
pressures
Speedfit fittings suitable for central heating systems can
withstand temperatures up to 114°C intermittently for
short periods.
Speedfit fittings shown as not suitable for central heating
systems are used primarily on the domestic hot and cold
water system accepting temperatures of up to 65°C.
Handling fittings and pipe
Ensure fittings and pipe are kept clean at all times by
keeping them in bags and boxes provided. Do not empty
Speedfit products onto the floor area. Ensure internal
O-Ring seals are kept free from dirt and debris.
Product selection
and installation
John Guest fittings and related products are specifically
designed and manufactured by John Guest to the
Technical Specifications set out in this guide.
All John Guest fittings and related products should be
selected, used and maintained in accordance with these
Technical Specifications.
It is the customer’s / user’s responsibility to ensure that
John Guest fittings and related products are suitable for
their intended applications, are properly installed and
maintained and are used in accordance with the
Technical Specifications. It is also the customer’s / user’s
responsibility to provide it’s own customers with any
relevant technical information about John Guest products
it supplies them.
John Guest produce a push-fit system of pipe and fittings for
compressed air situations. See separate literature for details.