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of 36
ESP400-10-200L and 300L
Examples of acceptable discharge arrangements are:
i. ideally below a fixed grating and above the water seal in a trapped gully.
ii. downward discharges at low level; i.e. up to 100mm above external surfaces such as car
parks, hard standings, grassed areas etc. are acceptable providing that where children may play
or otherwise come into contact with discharges a wire cage or similar guard is positioned to
prevent contact, whilst maintaining visibility.
iii. discharges at high level; e.g. into a metal hopper and metal down pipe with the end of the
discharge pipe clearly visible (tundish visible or not) or onto a roof capable of withstanding
high temperature discharges of water and 3m from any plastic guttering system that would
collect such discharges (tundish visible).
iv. where a single pipe serves a number of discharges, such as in blocks of flats, the number
served should be limited to not more than 6 systems so that any installation discharging can be
traced reasonably easily. The single common discharge pipe should be at least one pipe size
larger than the largest individual discharge pipe (D2) to be connected. If unvented hot water
storage systems are installed where discharges from safety devices may not be apparent i.e. in
dwellings occupied by blind, infirm or disabled people, consideration should be given to the
installation of an electronically operated device to warn when discharge takes place.
Note: The discharge will consist of very high temperature water and steam. Asphalt, roofing felt and
non-metallic rainwater goods may be damaged by such discharges and you must take this in to account
when fitting the unit. Should such damage be caused, ESP will accept no liability for any consequent
damage so caused.
Table 1 - Sizing of copper discharge pipe (D2) for common T&P relief valve sizes
7.0 HOW TO CONNECT TO THE HEAT PUMP
As the heat pump is an integral part of the unit, there are no special requirements for attaching the heat pump to
the integrated cylinder – all mechanical and electrical connections are factory made.