Installation
The Presfix unit is despatched mounted on a wooden pallet and covered in a protective film, it is recom
mended that the unit be retained in the protective packaging until the product is to be installed.
The unit will arrive pre-packaged and wired ready for installation.
This product has been fully run tested at our works under simulated site conditions.
The unit should be sited in a clean well ventilated area with good all round access.
Electrical connections
The cable used for the incoming supply must be of adequate size to carry the motor full load current. This is
shown on the duty plate. All non power caballing should be limited to 2.5mm².
All connections must be made using the appropriate wiring drawings for the equipment being
installed, with particular attention being paid to the supply voltages.
The supply voltage is shown on the set duty plate.
Never operate this product with the control panel or switched spur lid removed.
It is essential that this equipment is earthed to the building earth system.
The base frame must be earth bonded directly to the building earth system
All wiring should be arranged such that it enters the control section through the appropriate
cable glands.
Water supply and system connection
Connect the Presfix set ½”BSP ball valve (left side of break tank) to a suitable water supply, incorporating an
approved stop cock.
If the pressure available at the ball valve is below 0.3 bar, a low pressure orifice must be ob
tained and fitted.
Extend the ¾” plastic overflow pipe from the Presfix break tank to a position where an overflow
will be noticed and rectified.
Connect the pressurisation port ½” BSP (right hand side of unit) to the expansion vessel
pipeline which in turn should be connected to the suction side of the system circulating pump. Quick fill and
isolating valves must also be fitted to this line (see connection sketch Fig 1)
Commissioning
1. Fill the system with water via the quick fill filling loop to the system fill pressure, this filling loop must
comply with local water authority bylaws and contain double check valves. The filling loop must be completely
removed after the system has been filled.
The pressurisation unit must never be used to fill the system.
The maximum running time for pumps fitted to this product must not exceed 4 hours in any 24
hour period.
It is essential that all air is allowed to escape freely via air vents and radiator vents etc.
All air must be evacuated from the system for this product to operate correctly.
2. Turn on the water supply feeding the product break tank.
Water treatment crystals/chemicals must never be introduced to the system via the break tank.
3. Check that pumps have been fully evacuated of all air by removing the bleed screw of each pump and
allow water to escape until no air is present. Replace bleed screws.
Operation
Switch the main power supply to the product to the on position. Turn the switched spur situated at the front of
the product to the on position. On two pump products switch the auto switch situated on the right hand side of
the product to the auto position.
The unit will now automatically maintain the system pressure to the duty set point and will only operate when
the system pressure falls below the system fill pressure.
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presfix alpha REV B o and m instructions:Layout 1
09/05/2012
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