Page 386 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

The City & Guilds Textbook: Plumbing Book 1

Isolation valve

In-line strainer
Hot water draw-off Expansion vessel
Temperature Pressure reducing valve
relief valve

Balanced cold connection
Check valve

Expansion (pressure)
Immersion heaters relief valve
D1 discharge pipework
Tundish
D2 discharge pipework

Cold feed

p Figure 6.17 Direct-type unvented hot water storage cylinder with external expansion vessel

Terminal
Isolation valve

In-line strainer
Flue pipe
Pressure
Balanced cold reducing valve Draught diverter
connection
Expansion
vessel
Single
check valve
Temperature
relief valve

Expansion
(pressure)
relief valve Tundish
Discharge
pipe
Wiring centre and cylinder thermostat
Gas burner
Gas pipe

p Figure 6.18 Gas-fired direct-type unvented hot water storage cylinder with external expansion
vessel

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