18 Commissioning
1.
If the installation is unvented, before filling the system with water, check the air
pressure in the potable water expansion vessel and adjust as necessary to a
nominal 3.5bar.
2. If the pressure regulating valve supplied with the unvented kit is an adjustable
type, ensure that the setting is limited at a maximum of 3.5bar.
3. Ensure all drain valves are closed
4. Open a tap at the furthest distance from the cylinder.
5. Open the isolation valve in the water supply to the cylinder, allowing the
cylinder to fill and air to be expelled from the system via the open tap. Continue
to allow water to flow from the open tap for some minutes until the water flows
freely without air and dirt particles.
6. Check/operate each tap in turn on the system to ensure that the pipework is fully
vented of air and dirt/installation debris is flushed from the installation.
7. Visually check all joints for water tightness.
8.
Check the operation of all relief valves
by manually opening the valves via the
attached levers and ensuring that the discharged water clears freely via the
tundish and the discharge pipework. Check that the flow ceases completely when
the levers are released.
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Immersion Heater
9. Turn on the power supply to the immersion heater/s and allow the cylinder to
heat up.
10. Check operation of control thermostat.
11. Visually check all joints for water tightness.
12. Check that no water is/has issued from the thermal and pressure relief valve or
expansion relief valve.
Cylinder and Buffer Vessel
13. Manually open the motorised valve in the primary circuit and fill, flush and vent
the primary coil observing any instructions from the boiler manufacturer.
14. Turn on the primary heat source (boiler) and allow the cylinder to heat up.
15. Check operation of control thermostat and motorised valve
16. Visually check all joints for water tightness.
17. Check that no water is/has issued from the thermal and pressure relief valve or
expansion relief valve.
