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5.2 MODIFICATION OF LATCH SETTINGS AND OUTCOMES
Refer to section 4.20, which discusses latch behaviour. The ‘Latch on Low unreachable
setting’ can be used. Refer also to section 2.12.5.2. for an explanation of revised
Pegasus2 / PRV operation. Note the warnings against other settings.
When plumbed into the upper chamber of the PRV, activation of the Latch will cause the
PRV to switch between being regulated under control of the pilot valve or bypass of the
pilot valve.
Facilities are available to manually test the latch (solenoid valve) option using buttons
within the IDT tool. The latch can be opened or closed by the installer. However, a
modification to section 4.18 (Latch option - Testing) applies:
Caution: The installer should be mindful of the subsequent affect to the water outlet
pressure before manually operating the latch solenoid to by-pass the pilot
valve.
** With non-standard plumbing, the Outlet will decrease in water pressure,
causing the water supply to be cut off when by-passing the pilot valve.
** Ensure the outlet water pressure being cut off can be tolerated by users of
the water network prior to manually operating the Latch solenoid valve.
(e.g. Test at a time when water is intended to be cut off).
(When correctly set up and running under automatic control, Pegasus2 will
bypass the pilot valve only when the outlet water pressure is intended
to be low (and a further reduction is desired).
5.3 MODIFICATION OF CONTROL METHOD
Usual setup is to use Time Control only; This can be set to follow the desired outlet
pressure including taking the pressure to 0m at the times when the outlet water supply
is intended to be cut off.
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