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Issue 1 06/02/20
8
Maintenance
• Wash any particulate matter from the strainer under clean
running water.
• Replace the strainer and screw the Pressure Reducing
Valve cartridge into the moulded housing.
• Close hot tap, turn on isolating valve or main stop cock to
the system. Check for leaks.
8.2.4 Expansion vessel charge pressure
• Remove the dust cap on top of the vessel.
• De-pressurise the system by turning the mains supply off
and then opening a hot tap.
• Check the charge pressure using a tyre pressure gauge.
The pressure must be set in accordance with the inlet
pressure set on the pressure reducing valve.
• If it is lower than the required setting it should be re-
charged using a tyre pump (Schrader valve type).
• Re-check the pressure and when correct replace the dust
cap.
8.2.5 Re-commissioning
• Check all electrical and plumbing connections are secure.
Close the drain cock.
• With a hot tap open, turn on the cold water supply and allow
unit to refill.
• Do Not switch on the heat source until the unit is full.
• When water flows from the hot tap allow to flow for a short
while to purge air and flush through any disturbed particles.
• Close hot tap and then open successive hot taps in system
to purge any air.
• When completely full and purged check system for leaks.
• The heat source can then be switched on.
Caution
DO NOT OVER-PRESSURISE