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Cont ...
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.
z
Ensure the unit is sited in a frost free area, away from precipitation and
water sprays/jets.
z
All necessary pipe/electrical connections should have been made to a
satisfactory standard by a qualified person.
z
The temperature and pressure at the point of connection are within the
operating limits of the pressurisation unit.
z
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.
z
Ensure the system connection has been made into the heating/chiller
system return header.
z
Ensure Non-return valves, pressure reducing valves or RPZ valves are
NOT
installed between the pressurisation unit and the heating/cooling system.
z
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
SPU Mini is
NOT
designed to fill the system from empty, it is only intended to
top up the system after occasional water leakage.
z
Ensure the heating/cooling system is filled and pressurised to the required
cold fill pressure, with the water at approximately ambient temperature.
z
Ensure the system is dosed with a suitable corrosion inhibitor. Note the
SPU Mini is not designed for dosing chemicals into the system, this must
be done via other means.
6.14
Expansion vessel setting:
z
To set or check the expansion vessel charge pressure the lock-shield
valve between the SPU Mini and the vessel must be closed and the
vessel drained using the drain valve.
z
A suitable gauge should be used to check the charge pressure.
z
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.
z
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.
z
When the correct pressure is set the Schrader valve protective cap must
be replaced.
z
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.
Summary of Contents for Stuart SPU 130 Mini
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