Commissioning - FLOWTECH Flowpress Mini Single Operation And Maintenance Manual

6 COMMISSIONING

6.11 Pre-commissioning checklist:
Before starting the commissioning process the following conditions must be met. If these conditions
are not adhered to, damage to the equipment, system and property may result.
• Ensure the unit is sited in a frost free area, away from precipitation and water sprays/jets.
• All necessary pipe/electrical connections should have been made to a satisfactory standard by a
qualified person.
• The temperature and pressure at the point of connection are within the operating limits of the
pressurisation unit.
• The heating/cooling system is fitted with a safety valve and expansion vessel sized appropriately.
6.12 In order for the pressurisation unit and heating/cooling system to function
correctly the following conditions must be met. If these conditions have not
been met, the commissioning process should not continue.
• Ensure the system connection has been made into the heating/chiller system return header.
• Ensure Non-return valves, pressure reducing valves or RPZ valves are NOT installed between the
pressurisation unit and the heating/cooling system.
• The expansion vessel is pre-charged to the correct pressure (equal to initial system design
pressure).
6.13 Prior to commissioning, fill the heating/cooling system via a filling loop. The
Flowpress Mini is NOT designed to fill the system from empty, it is only intended to
top up the system after occasional water leakage.
• Ensure the heating/cooling system is filled and pressurised to the required cold fill pressure, with
the water at approximately ambient temperature.
• Ensure the system is dosed with a suitable corrosion inhibitor. Note the Flowpress Mini is not
designed for dosing chemicals into the system, this mustbe done via other means.
6.14 Expansion vessel setting:
• To set or check the expansion vessel charge pressure the lock-shield valve between the
Flowpress Mini and the vessel must be closed and the vessel drained using the drain valve.
• A suitable gauge should be used to check the charge pressure.
• If the charge pressure is too high it can be reduced by releasing air from the vessel pre-charge
valve or by using a pressure gauge with an integral air release valve.
• If the charge pressure is too low a small increase can be provided using a car foot pump
otherwise an oil free compressor or nitrogen bottle is recommended.
• When the correct pressure is set the Schrader valve protective cap must be replaced.
• Check the integrity of the pipe-work. Ensure the lock-shield valve between the system and the
expansion vessel is open and the drain valve is closed.