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Why Pump Multi-Outlets?
Most domestic installations rely on a combination of mains fed cold water
and tank fed hot and cold water to satisfy all their tic water requirements.
Typically, the kitchen might receive mains fed cold water with bathrooms
being fed from stored cold water. The hot water cylinder will normally
be fed from the cold water storage tank via either a 22mm or 28mm down-service
and this will supply all the hot outlets in the house.
Exceptions to this type of water
supply are the unvented and combination boiler water systems where mains fed
cold water is used to pressurise the hot water supply which then feeds directly
to the required outlets. The cold water is likewise fed directly from the mains
supply to the required outlets. Since these systems are fed directly from the
mains cold water supply, water regulations prohibit the installation of
pumps.
If the property does however, rely
totally or partially on tank fed supplies then pumping either the hot or cold
or both can prove advantageous in the following applications:-
- To boost hot water to outlets
where it is advantageous to equalise the supply pressure to the mains fed cold
appliances e.g. mixer taps, bath fill, etc.
- To accelerate the fill rate to
outlets such as Dish Washers or Washing Machines and from "restrictive"
continental type basin and bath mixers taps.
- To boost the flow rate to all
outlets and appliances in the house including power
showers
The Techflow Solution will depend on
the size of the house, the number of outlets to be pumped and the nature of the
appliances.
The Techflow
Solution
- Where independent boosting of
either hot or cold supplies is required a Single Ended Pump should be fitted.
For further information see Technical Data Sheet No.
2.
- As a guide for multi-outlet
applications the following table should be used:
| SYSTEM |
 |
PUMP TYPE |
| |
|
|
| Up to 3
terminal appliances demanding either mixed or short cycle single temperature
supply |
|
Conventional Twin Ended Pump |
| |
|
|
| Whole
House pumping with up to 6 appliances, including and single temperature
application, WC's, washing machines and dishwashers |
|
Conventional Twin Ended Pump fitted with By-Pass Kit |
| |
|
|
| Whole
House pumping with more than 6 terminal appliances |
|
2 x
Single Ended Pumps with negative head control units.
(Whole House
Pack) |
By-Pass Kit
The Kit
consists of two adaptors which push-fit to the outlet connectors of the Pump
before fitting the Hoses. The adaptors are connected by a small bore flexible
tube. If a twin-ended pump is then run with one supply closed off on the outlet
side i.e. basin or bath taps, toilet cisterns, washing machines, dishwashers,
etc. the By-Pass Kit will ensure that the closed end of the pump maintains a
low flow of water to prevent overheating and subsequent seal damage (See Fig 1). The By-Pass Kit can be retrofitted to any existing
installation.
Fig 1 By-Pass
Loop Diagram
Whole House Pumping Pack
The Whole House Packs are available as QT45SE/NHE-2, QT80SE/NHE-2 and QT120SE/NHE-2
Systems and include two single ended pumps together with pressure operated
switching units. (See Fig 2) below for an example of a
typical installation.
Fig 2 Typical
Whole House Installation
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