Installation manual

32 ©ESP Ltd. Sept 2008
Inlet Control Group - Two Piece (Core Unit)
Forerunner of the Multibloc one piece control, this Inlet Control Group is again
used on all types of Unvented Systems and comprises of a separate Pressure
Reducing Valve/Strainer and combined Check/Expansion Valve core unit of-
fering the following features.
• Separate Pressure Reducing Valve with integral coaxial stainless steel strainer
-enables remote siting of the Pressure Reducing Valve if required.
• Droptight balanced seat Pressure Reducing valve - very stable under fluctuat-
ing inlet pressure conditions.
• Unique one piece Pressure Reducing Cartridge with noise reduction comb -
facilitates ease of maintenance, reduces system noise further and prevents
cavitation.
• Balanced cold water connection - equal pressures to mixer taps/showers.
• Separate Check/Expansion Valve core unit with integral Expansion Vessel
connection.
• Unique replacement Expansion Valve cartridge
and seat - enables refurbishment of existing valve
without removal.
• Superior flow rates - up to 55 l/m.
 Multi-orientational - installation flexibility.
In addition to the standard specification DZR brass
Expansion Valve seat of the core unit, Reliance
have developed a stainless steel seat version for the
exclusive use of one Unvented Systems manufac-
turer, proving Reliances‟ commitment to continual
development to offer the best available control
package.
Inlet Control Group - Three Piece (Check Valve Manifold)
Used on all types of Unvented System, this Inlet Control Group is for larger
domestic and commercial installations where a high flow rate is required to
satisfy peak demand.
• Separate Pressure Reducing Valve with integral coaxial stainless steel
strainer, droptight balanced seat design and one piece cartridge with unique
noise reduction comb.
• Check valve manifold with Integral connections for Expansion Valve, Ex-
pansion Vessel and Balanced cold water supply.
• High discharge capacity Expansion Valve with replaceable cartridge and
seat feature.
• High Flow rates - up to 77 l/m.
 Multi-orientational - installation flexibility.
Although the various Inlet Control
Groups are the most common
“functional controls” supplied with
today‟s units, some Unvented Systems
still use individual, separate controls.
All controls supplied by Reliance in
this format offer similar technical fea-
tures to the Inlet Control Groups but
do not allow provision for a balanced
cold water connection or integral ex-
pansion vessel connection - these must
be supplied by the “approved” in-
staller, using additional fittings in the
pipework.
UNVENTED HOT WATER STORAGE SYSTEMS AND CONTROLS