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HP Installation and User Instructions R00918
-
1 03/11
Page 11
Pre
-
Installation
- Where a single common discharge
pipe serves more than one system,
it should be at least one pipe size
larger than the largest individual
discharge pipe (D2) to be
connected.
- The discharge pipe should not be
connected to a soil discharge stack
unless the soil discharge stack is
capable of safely withstanding
temperatures of the water
discharged, in which case, it should:
- contain a mechanical seal, which
allows water into the branch pipe
without allowing foul air from the
drain to be ventilated through the
tundish.
- there should be a separate
branch pipe with no sanitary
appliances connected to it.
- if plastic pipes are used as branch
pipes carrying discharge from a
safety device, they should be
either polybutalene (PB) or cross-
linked polyethylene (PE-X)
complying with national
standards.
- be continuously marked with a
warning that no sanitary
appliances should be connected
to the pipe.
4.4.3 Termination of discharge
pipe
- “The discharge pipe (D2) from the
tundish should terminate in a safe
place where there is no risk to
persons in the vicinity of the
discharge.”
- Examples of acceptable discharge
arrangements are:
- “to a trapped gully with the end of
the pipe below a fixed grating and
above the water seal;
- 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 a wire
cage or similar guard is positioned
to prevent contact, whilst
maintaining visibility; and ,
- discharges at high level: e.g. into a
metal hopper and metal downpipe
with the end of the discharge pipe
clearly visible or onto a roof capable
of withstanding high temperature
discharges of water and 3m from
any plastic guttering system that
would collect such discharges.”
Note: As the discharge would
consist of high temperature water
and steam, asphalt, roofing felt
and non-metallic rainwater goods
may be damaged by such
discharges.
4.5 Limitations
- The heat pump must be specified
correctly, to ensure it is compatible
with the model of cylinder installed.
This is to prevent the heat pump
malfunctioning when preparing
domestic hot water.
- The heat exchangers in this range of
cylinders have been specifically
designed for heat pump
applications. Great care must be
taken if using these cylinders with
other heat sources, due to the heat
exchange capacity of the product.
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