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- Xylem Presfix Packaged Pressurisation Sets
Presfix pressurisation units are designed to replace water that has been lost through system leakage and to maintain the system design fill pressure in sealed heating and chilled water systems in accordance with BS7074 parts 1,2 & 3.
Presfix units also provide safety circuits locking out the boiler / chiller in the advent of high/ low pressures occurring. Expanded water is accommodated in membrane vessel/s that are supplied separately and normally installed alongside the Presfix unit.
Specifications
- Standard flow range: 0 - 400 l/m
- Standard pressure range: 1 – 6 Bar
- Higher flow rates available on request.
Sealed system benefits
In today’s demanding environment nearly all heating and chilled water circulating systems are designed to operate in sealed networks.
The main benefits over previous systems which used feed and expansion tanks to accommodate expanded water are many, large volumes of water are no longer required to be stored at the top of the building. Expansion vessels can now be used in place of the storage tanks and these can be placed anywhere in the building, usually in the basement where the weight is not such a problem.
The Feed and expansion tank being open to atmosphere allowed water to evaporate making unnecessary demands on this precious resource.Sealed systems reduce corrosion to an absolute minimum by sealing the system content from atmosphere, and only adding fresh water to replace loses through leakage.
Sealed systems also offer the possibility of operating at higher temperatures if required (Max 120°C) which permits lower circulation rates, smaller pumps and reduced pipe work dimension with obvious cost savings.
Application
Presfix pressurisation units are designed to replacewater that has been lost through system leakage and to maintain the system design fill pressure in sealedheating and chilled water systems in accordance withBS7074 parts 1, 2 and 3.
Presfix units also provide safety circuits locking out the boiler / chiller in the advent of high/ low pressuresoccurring. Expanded water is accommodated in membrane vessel/s that are supplied separately and normally installed alongside the Presfix unit.
Presfix units are perfect for either domestic or industrialenvironments. Two levels of sophistication are offeredalong with three pressure ranges.
Both levels provide volt free contacts that can be usedto interface with either a Business Management Systemor any other type of monitoring system.
Presfix units have flow limiting devices to help preventplant rooms from flooding in the advent of systempipe/fitting failure.
Control features
- Mains door interlocked disconnect switch.
- Auto/Manual/Off selector switch
- Back lit digital display
- Control panel section IP 54
- MCB protected motors
- Simple set point adjustment
- Parameter lock
- Remote inhibit
- Delay start
- Exercise regime
- Break tank low water monitoring
- Transducer controlled
- High/Low pressure contacts for boiler/chiller interlock
- Anti-bounce internal vessel 2lt electronically assisted
- Isolating valves on each pump
- Hours run for each pump
Specification
Base/enclosure
Open frame units have base plates manufactured
from 14SWG galvanised steel and are suitable for
floor mounting.
Enclosed units are manufactured from powder coated
steel and have individual sections for electrical
equipment and hydraulic equipment.
These units are suitable for either floor or wall mounting.
Pumps
Various pump types are used across the range, 2.8
bar units use Diaphragm pumps with Polypropylene
heads and EDPM diaphragms and valves.
All other ranges use Horizontal Peripheral types with
Bronze/composite bodies and impellors with self
priming seals.
Break tank
Manufactured from Polyethylene with an 18lt
active capacity complete with weir and clip tight lid.
Ball valve 15mm to BS1212 part 2 constructed to
give a type AB air gap in accordance with the water
regulations 1999.
Overflow 22mm (plastic).
