4
Pre-installation
Installation
PumpWise guidelines
General specification
Trouble shooting
PumpWise and warranty
1. Location of the pump
The best possible location for the pump is
at or near the base of the cylinder at least
600mm below the bottom of the cold water
storage tank. Where it is not physically
possible to locate the pump next to the
cylinder, the pipe run from the hot water
cylinder to the pump must not exceed 4m in
22mm pipe work.
1.1 Cooling and ventilation
The pump should be placed in a position
where there is an adequate air flow to cool
the motor and separated from any other
appliances that generate heat. It should be
installed in a clear space allowing 100mm
additional space at each side, the ends and
top of the pump.
1.2 Frost protection
Loft mounted pumps must be protected
from frost damage.
2. Hot and cold supplies
to the pump
Never fit the pump directly to the cold
water mains.
Never fit to communal risers (e.g. block of
flats) or secondary circuits that are pumped.
The pump must be fed by exclusive hot and
cold water supplies (i.e. not shared with other
services) and in 22mm pipe work (Note: for
the RP50PT and RP55PS a maximum of 2m of
15mm inlet pipework direct from the cylinder
to the pump).
The hot supply pipe work should be a
maximum of 4m from the cylinder in 22mm
pipe work.
All up and over pipe work must be vented at
the highest point on the outlet of the pump
and a non-return valve (NRV) may require
Please follow these installation instructions carefully. Failure to install your pump in
accordance with these instructions will invalidate your warranty.
fitting to the hot outlet only (Note: this is
only for the RP50TU and RP55SU).
2.1 For pumps positioned above
the hot outlet, hot water
cylinder or in a loft
An anti-gravity loop (AGL)of at least 400mm
(ideally using swept bends) must be used
when the pump is sited above the dome
of the hot water cylinder as it prevents air
tracking up into the pump chamber and
back siphoning of the water, again, creating
air in the pump chamber.
An approved side or top entry flange must
be used in these circumstances for the hot
water connection to the cylinder, with the
Essex or alternative side entry flange being
the recommended method of connection.
If the pump experiences aeration or low
pressure as a result of poor flow to the
pump with the use of a top entry flange,
a side entry or Essex Flange may become a
requirement.
2.2 Cold water storage
Ensure that the cold water storage capacity
is adequate for all of the household
requirements (minimum 50 gallons/227 Litres
per bathroom, 80 gallons/385 Litres for one
bathroom and one en-suite shower room).
Ensure the cold water supplies to the cylinder
and the pump are taken from the opposite
side of the cold water storage tank from the
cold mains inlet.
Figure 1: Tank inlet and outlet position
Outlet to
cylinder
Inlet
Bottom of cold
tank must be
cleared of debris
Outlet to pump
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