Page 443 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

Chapter 6 Hot water systems

7 Identify the components in the unvented hot water system below.

1 2

3 4
Balanced cold supply to outlets

a 1: Strainer; 2: Isolation valve; 3: Expansion relief valve; 4: Check valve
b 1: Isolation valve; 2: Strainer; 3: Check valve; 4: Expansion relief valve
c 1: Pressure reducing valve; 2: Isolation valve; 3: Check valve; 4:
Strainer
d 1: Isolation valve; 2: Strainer; 3: Pressure reducing valve; 4: Check
valve
8 What temperature should the temperature relief valve fitted to an
unvented hot water storage vessel be set to discharge at?

a 60°C
b 72°C
c 90°C
d 95°C
9 Which of the following types of thermostatic mixing valve (TMV) should
be installed within NHS and healthcare properties?
a TMV1
b TMV2
c TMV3
d TMV4
10 When considering discharge pipework from an unvented storage cylinder,
what is the minimum size for D2 pipework if the D1 pipework is
connected to a G1/2 valve outlet?
a 15 mm
b 22 mm
c 28 mm
d 35 mm

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