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Pre-installation
Installation
PumpWise guidelines
General specification
Trouble shooting
PumpWise and warranty
Pre-installation
Installation
PumpWise guidelines
General specification
Trouble shooting
PumpWise and warranty
Pre-plumbed direct or indirect
combination units
These are purpose-made units typically for
use in multiple flat developments, usually in
towns and cities where it is advantageous
and desirable to provide the occupants with
completely independent hot and cold
water services.
In these systems the ideal pump is an
ESP 50/75 CPV. For alternative types of
combination units see Elson, Figure 23 and
Fortic (type), see Figure 24.
Figure 22: Pre-plumbed direct or indirect
combination units
Cold mains
ball valve
Immersion heater
and an indirect
connection to a
boiler
Lid
H
C
Cold
water
storage
MAX
65°C
OLD STYLE DO NOT USED
Fig 19 Pre plumped
MAX
65˚C
Cold mains
ball valve
Cold
water
storage
Immersion heater
and an indirect
connection to a
boiler
Lid
HC
Elson (type) tanks
In these systems it is important to ensure
the hot and cold water storage capacity is
adequate for the type of pump to be used.
The refill ball valve on the small cold tank
which refills the hot tank is correctly set to
prevent aeration of the hot supply water to
the pump.
Figure 23: Elson (type) tanks
C
H
Cold
tank
Hot
tank
Immersion
heaters
Refill ball valves
Cold
tank
Hot
tank
Refill ball valves
Immersion
heaters
CH
Fig 20 Elson tanks
OLD STYLE DO NOT USED
Helpful guidelines
Water starvation protection, pipework arrangements and
stored hot water
Fortic (type) tanks and
pre-assembled units
Typically used in very small flats and houses.
Not usually with sufficient water capacity of
cold water for pumped systems.
Figure 24: Fortic (type) tanks and
pre-assembled units
Water starvation protection
In systems where it is absolutely not possible
to increase the usable cold water storage
capacity to meet the increased demand
of a pumped system; a water starvation
protection unit (WSP) may be considered.
The WSP is a Salamander level switch which
must be positioned 102mm higher than the
highest outlet from the cold water storage
tank. When the water level drops too far the
WSP will switch off the pump until the cold
water storage level is recovered.
OLD STYLE DO NOT USED
Fig 21 Fortic tanks
102mm
Outlets
Water starvation
protection unit (WSP)
4 inches
Outlets
WSP
OLD STYLE DO NOT USED
Fig 22 Water starvation
Figure 25: Water starvation protection
unit (WSP)
Shower head size vs bar pressure
The size of a shower head dictates the bar
pressure of the pump required to deliver the
expected performance of the shower.
Shower head diameter Bar pressure
Up to 5cm 1.5 bar
5-10cm 2.0 bar
10-12.5cm 2.5 bar
More than 12.5cm 3.0 bar
Anti-gravity loops
An anti-gravity loop (AGL) must always
be fitted to systems where the pump is
positioned above the hot outlet from the
cylinder. The AGL which limits aeration
of the hot supply to the pump is formed
by bending the pipework downwards for
250mm, as it exits the Essex Flange, before
rising again to the pump. See Figure 26
overleaf.
SAL6479 Pumps Install DocAW1 .indd 14-15 29/09/2011 11:28
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