3
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 RP50PS
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
Please follow these installation instructions carefully. Failure to install your pump in
accordance with these instructions will invalidate your warranty.
the highest point on the outlet of the pump
and a non-return valve (NRV) may require
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) off a No stop
Essex Flange must be used when it 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.
Never put a non-return valve, inverted loop,
restrictive balofix or an air vent on the
supply pipe work to a pump.
Where the pump is servicing two or more
bathrooms, the cold water supply to the
cylinder must be in 28mm pipe work.
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.
Outlet to
cylinder
Inlet
Bottom of cold
tank must be
cleared of debris
Outlet to pump
Fig 1
Fig 2