Terms & Conditions - gledhill GC2000/120/E-OV Design, Installation & Servicing Instructions

GULFSTREAM 2000 - SP MODELS ONLY
Design/Installation details for the CA type backflow prevention valve
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Supplied By www.heating spares.co Tel. 0161 620 6677
APPENDIX A
assembly and anti-vacuum valve
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C A VALVE ASSEMBLY
The above components are supplied loose with
the SP models only and will need to be installed
on site adjacent to the appliance in accordance
with the following instructions ;
The CA type backflow prevention valve and
pressure regulating valve assembly provides
automatic filling of the appliance/sealed
heating system from a permanent connection
to the mains cold water supply.
This is now allowed by the Water Regulations to
stop any possible contamination of the mains
cold water supply by the water in the heating
system.
This replaces the temporary filling loop
arrangement historically required by the
Water Byelaws and means the connection
to the mains cold water supply can be
permanent. This will allow any loss of water
from the heating system to be automatically
replenished as with an open vented system
fitted with a feed and expansion cistern.
Details of the valve assembly and its installation
requirements are shown opposite.
The valve requires a pressure differential to
operate correctly and a minimum dynamic
pressure of 2.0 bar is required at the connection
to the appliance under maximum domestic
water simultaneous demand conditions.
The pressure regulating valve is set to 1.0 bar.
This is usually sufficient for the heating systems
in most domestic properties and is the same
as the factory setting for the expansion vessel
supplied with the appliance.
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