
8
Pre-installation
Installation
PumpWise guidelines
General specification
Trouble shooting
PumpWise and warranty
Right universal pumps
A right universal twin pump to a bathroom
in a loft-conversion.
Figure 10: Negative head
Right pumps (positive head)
Right universal twin pumps to a whole house
system. In these systems TOILETS must be
fitted with equilibrium ball valve(s).
Figure 11: Positive head
Negative head systems
Negative head systems exist where no
natural flow of water goes to the outlet
because either the outlet or the pipework
to the outlet are above the height of
the base of the cold water cistern. Most
instances of negative head systems occur
in loft conversions or where the cold water
cistern sits on the joists in the loft. If the
distance between the bottom of the cold
water cistern and the highest point of the
system after the pump is 2 feet (610mm)
or less, it is also possible that a universal
pump will be required. Salamander’s
universal range of pumps activates the
pump automatically even where no natural
flow exists.
Negative head is also needed for electric
showers, dishwashers, washing machines or
where pumped hot water meets mains cold.
Fit an
equilibrium
ball valve
The hot
connection
must be via
an approved
side or top
entry flange
(see page 16)
Vent and
other
services
Cold water storage
Negative head
Outlet
Inlet
Outlet
Fit an
equilibrium
ball valve
H
C
MAX
60˚C
Fit an
equilibrium
ball valve
600mm or
less possible
negative head
Positive head
Usable capacity
minimum 50 gallons
per bathroom
The hot
connection
must be via
an approved
side or top
entry flange
(see page 16)
Vent and
other
services
Cold water storage
MAX
60˚C
Outlet
Inlet
Outlet
Inlet
Washing
machine
H
C