Commissioning - Stuart Turner Stuart SPU 130 Mini Installation, Operation & Maintenance Instructions 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
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water sprays/jets.
All necessary pipe/electrical connections should have been made to a
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satisfactory standard by a qualified person.
The temperature and pressure at the point of connection are within the
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operating limits of the pressurisation unit.
The heating/cooling system is fitted with a safety valve and expansion
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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
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system return header.
Ensure Non-return valves, pressure reducing valves or RPZ valves are NOT
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installed between the pressurisation unit and the heating/cooling system.
The expansion vessel is pre-charged to the correct pressure (equal to
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initial system design pressure).
6.13 Prior to commissioning, fill the heating/cooling system via a filling loop. The
SPU 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
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cold fill pressure, with the water at approximately ambient temperature.
Ensure the system is dosed with a suitable corrosion inhibitor. Note the
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SPU Mini is not designed for dosing chemicals into the system, this must
be done via other means.
6.14 Expansion vessel setting:
To set or check the expansion vessel charge pressure the lock-shield
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valve between the SPU 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.
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If the charge pressure is too high it can be reduced by releasing air from
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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
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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
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be replaced.
Check the integrity of the pipe-work. Ensure the lock-shield valve
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between the system and the expansion vessel is open and the drain
valve is closed.
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