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7
Inspection and maintenance
Due to HIUs being an inherently low maintenance space heating system,
the recommendation from BSRIA BG 62/2015 that a maintenance
check every 3 years should be sufficient.
BSRIA inspection and maintenance procedure guidance recommends at
least the following checks are carried out.
• No leaks associated with HIU or secondary distribution.
• Primary isolation valves are operable.
• Internal strainers are clear.
• Supply differential above required minimum.
• Thermal insulation is intact.
• Control valves respond to demand signals for heating and hot water.
• Supply temperatures to heating and hot water are as when the unit
was commissioned.
• Check mains pressure storage water heater safety valve (where
fitted).
• Heat meter registers demand (or replace and commission new heat
meter if scheduled).
• Consumer is satisfied with heating and hot water performance.
7.1
Cleaning the district filter
7.1.1
Removing the cover
▶ Remove the two screws [2] lift the cover [1] off the mounting frame.
Fig. 59 Removing the cover
6 720 808 928 (2017/06)
1
2
7.1.2
Draining the appliance
NOTICE: Risk of water damage to appliance or property!
Damage from disconnecting water pathways which may
have retained some water.
▶ Take care after draining appliance to protect
equipment/property from residual water content
within components.
District and central heating system
▶ Isolate the appliance from the district and central heating system
using the appliance isolation valves.
▶ Connect a suitable hose firmly to the required drain point and run the
hose outside to a suitable point or container.
Draining the appliance.
▶ Open the air vents at the top of the desired circuit to
aid draining the appliance.
▶ Ensure they are closed after draining has been
completed.
▶ Turn the drain valve anti-clockwise to open the drain. Turn the valve
firmly clockwise to close.
1
3
Fig. 60 Drain point connection
7.1.3
Filter removal
▶ Ensure the appliance is fully drained.
▶ Undo cap and drain point assembly [2].
▶ Ensure the washer [3] is intact and undamaged, replace if necessary.
▶ Remove the filter [1] and clean.
▶ To refit follow the above actions in reverse.
3
Fig. 61 Filter removal
Inspection and maintenance
2
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2
6720808928-63.1Wo
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