6
3.7 Recommended installation
Fig. 2 Positive-head pumps
Positive-head pumps
• Either Surrey, York, Warix or Essex flanges can be used,
depending on the cylinder type and installation.
• An Essex flange is recommended for pumps rated 3 bar and
above, i.e. models STP 3.0 B, SSP 3.0 B and STP 4.0 B.
• The hot-water supply to the shower pump must be via a
dedicated supply from the flange.
• Do not fit non-return valves on the inlet pipework to the pump.
The pump must be able to vent back to the cold-water storage
tank and hot-water cylinder.
• Avoid positioning outlets in the cold-water storage tank directly
below the inlet from the water mains supply in order to prevent
air from being drawn into the pump or hot-water cylinder.
• 22 mm pipework should be used to and from the pump.
• 15 mm pipework can only be used on STC 1.5 C, STL 1.0 C,
STL 1.5 C, SSL 1.4 C, STR 1.2 C, STR 1.5 C and SSR 1.5 C
pumps.
• The expansion pipe from the hot-water cylinder should always
rise in order to prevent trapped air.
• The outlet pipework from the pump to the shower valve should
rise, where possible, to prevent trapped air.
• Pipework from the pump to the shower valve should go up and
over, rather than under floor.
• Avoid blanked-off pipes (dead legs) which can trap air and
cause problems.
• Avoid kinks in the flexible hoses as this will restrict the flow of
water to and from the pump.
• All pipework should be secured down to minimise noise and
vibration.
• Low-voltage pumps, models STL 1.0 C, STL 1.5 C, SSL 1.4 C
and STL 2.0 C, must be connected to the 230 V electricity
supply via the supplied transformer only.
• After commissioning, the pump ensures that all hose
connections are tight to prevent air from being drawn into the
system.
TM04 6986 1310
System vent
Cold-water
storage tank of at
least 50 gallons
Cold-water supply connection to pump at least 25 mm
below cold-water supply connection to cylinder to
prevent supply of hot water only
Highest point of pipework at least 250 mm
(10 inches) below cold-water tank
See section 8. Technical data
for minimum and maximum
inlet heads from water level to
pump suction port.
Supply to another
shower, if required
Hot
Cold
Shower
valve
230 V, switched
spur
Low-voltage pumps
must be connected via
transformer only.
Mount the pump on
concrete slab to reduce
noise.
Recommended location of pump
at base of hot-water cylinder
Hot-water cylinder set
to a maximum of 60 ºC
Pipework connections, STC, STL
and SSL pumps
Pipework connections, STR, SSR, STP
and SSP pumps
Pump
Hot-water
cylinder
Domestic
hot-water
supply
Outlets
Flow
direction
Inlet
Inlet
Flow
direction
Inlet
Water mains supply
Expansion pipe
Cold-water supply to pump
Cold-water supply to
cylinder, min. 22 mm,
28 mm is recommended
22 mm
service
gate valves
Full-bore gate valve
Hot-water
supply to
pump
Surrey
flange
Outlet
Outlet
Inlet
Grundfos.bk Page 6 Thursday, April 22, 2010 10:28 AM
To Next Page
Loading...
Need help?
General
