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Secondary circulation is NOT recommended for units being used on “Off Peak” electricity tariffs.
Whilst secondary returns do make for greater comfort by having hot water immediately available at taps, it
is an energy sapping facility – it is recommended that all secondary returns should be fitted with
timers so that circulation is not constant. PLEASE NOTE: All secondary return pipework MUST
be very well insulated and, even then, may have a very detrimental impact upon the economics
of generating hot water.
6.9 Temperature and Pressure Relief Valve (“TPRV”)
The TPRV is factory fitted and must not be interfered with in any way and/or removed - under
NO circumstances should the installer or end user tamper with the TPRV or the
warranty/guarantee for the unit will be invalidated and serious damage may result. If the TPRV
fails it should only be replaced by a qualified installer under the following regulations - G3 (ENGLAND
AND WALES), TECHNICAL STANDARD P3 (SCOTLAND) OR BUILDING REGULATION P5
(NORTHERN IRELAND) AND THE WATER FITTING REGULATIONS (ENGLAND AND WALES)
OR WATER BYELAWS (SCOTLAND)
6.10 Warnings
Under no circumstances should the factory fitted TPRV be removed other than by
approved, fully trained and experienced fitters.
To do so will invalidate any
warranty/guarantee or claim and could be dangerous
.
The Cold Water Combination Valve, in-line strainer and scale inhibiting device must be
fitted to the cold water supply to the unit.
None of the control or safety valves should be modified in any way nor their
operation impeded.
Water may drip from the discharge pipe of the TPRV and this pipe must be left open to
the atmosphere. The discharge pipe should not be blocked or used for any other
purpose.
