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Indirect open vented hot water system

Supplementary resources

Cold feed supplies water from the storage cistern to the hot water cylinder

Go to Ayrshire College website

Hot water draw off transfers hot water from the cylinder to all the

www. ayrshire.ac.uk

taps in the house

Log in to Moodle for Ayr Campus

Open vent allows air to be released to the atmosphere to allow water

to fill into this part of the system

Sign into Plumbing SVQ Level 3 Year 2 : Hot Water Supply

N.B. A gate valve is situated on the cold feed pipe to facilitate shutting off the hot water supply

N.B. A drain valve is located at the bottom of the feed pipe to allow the whole system to be drained

down

BOILER

Indirect open vented hot water system

STORAGE CISTERN & F & E CISTERN

USED TO GENERATE HEAT

USED TO SUPPLY WATER TO DOMESTIC AND INDIRECT SIDES OF SYSTEM RESPECTIVELY

vent pipe

Water at the top of the cylinder will be warmer than the water at the bottom . This is known as stratification

feed pipe

hot water draw off

Legislation

MAIN COMPONENTS

Building (Scotland) Regulations 2004

BS EN 806 Pt 1 -5 Specification for installation inside buildings conveying water for human consumption

Water Supply (Water fittings) Regulations 1999

Scottish Model Water Byelaws 2004

BOILER

INDIRECT HOT WATER CYLINDER

FEED & EXPANSION CISTERN

STORAGE CISTERN

ASSOCIATED PIPE WORK & FITTINGS

Feed pipe supplies water from the F & E cistern to the fill the indirect side of the system

Vent pipe allows air to be released from the system to the atmosphere to allow the water to fill in

DOUBLE FEED INDIRECT CYLINDER

Primary flow transfers hottest water from the top of the boiler to the top connection on the cylinder

Primary return transfers cooler water from the bottom connection on cylinder

ASSOCIATED PIPE WORK AND FITTINGS

back to the boiler to get reheated

USED TO STORE HOT WATER

USED TO CONNECT ALL COMPONENTS OF SYSTEM TOGETHER

SECTION THROUGH CYLINDER

Design considerations

DESIGN CONSIDERATIONS

1. Check type of cylinder and grade required

2. 450 mm horizontal draw off at top of cylinder to prevent parasitic circulation

Hot water is required for ablutionary purposes, for the routine cleansing of buildings and operations such as laundry work, dishwashing etc. The requirement of an installation for the supply of hot water are that water at the required temperature and in sufficient quantities is available at the draw off points without delay.

3. Vent pipe sizing 150 mm + 40 mm for every meter of head continually rising to open end over cistern. Min pipe size is 22 mm

A VIEW ISIDE THE CYLINDER SHOWING THE HIGH EFFICIENT PART L COMPLIANT INDIRECT

DESIGN CONSIDERATIONS

COIL

4. Cold feed always one size bigger in diameter in relation to the draw off

THE FOLLOWING SHOULD BE TAKEN INTO ACCOUNT

IN THE PLANNING OF HOT WATER INSTALLATIONS

A. Total consumption

B. Peak demands

C. Storage capacity

D. Method of heating water

E. Insulation of hot pipes and vessels

F. Use of a circulating system

G. Choice of materials for installation in relation to the nature of water

i.e. corrosive , hard or soft

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