ACS Appliance Installation 2

Question 1

What is the maximum permissible length for a bayonet hose connector on a domestic gas cooker?

Accepted Answer

2 metres as specified by BS 669 and GSIUR 1998

Answer

BS 669 and GSIUR 1998 limit the length of a bayonet flexible hose for domestic gas cookers to 2 metres to minimise the risk of damage, leakage, and excessive pressure drop.

Question 2

When installing a gas fire in a pre-existing fireplace, what must the engineer check first?

Accepted Answer

The flue integrity, draw, and cross-sectional area to ensure it can safely remove products of combustion from the appliance

Answer

Before installing any gas fire, the engineer must conduct a flue draw test (smoke test) and verify the flue is clear, adequately sized, and correctly terminates to ensure safe removal of combustion products.

Question 3

What does the 'gas rate' of an appliance measure?

Accepted Answer

The volume of gas consumed per unit time, used to verify the appliance is operating within its design range and not overfiring or underfiring

Answer

Gas rate (cubic metres or cubic feet per hour) is measured using the meter and timing the gas consumed; it is compared to the manufacturer's data to confirm correct gas input and safe operation.

Question 4

Which type of gas valve controls the main burner gas flow and is required to close safely in the event of a fault?

Accepted Answer

A solenoid valve controlled by the appliance's safety circuit, which closes if a fault is detected

Answer

Solenoid valves in the gas train are normally closed and require energisation to open; if the appliance detects a fault (no flame, overheat), the solenoid closes, stopping the gas supply safely.

Question 5

When must an engineer carry out a spillage test on an open-flued gas appliance?

Accepted Answer

After installation, servicing, or any work that could affect flue performance, to confirm combustion products are being safely evacuated

Answer

A spillage test (using a smoke match or detector) is required after any work on an open-flued appliance to confirm the flue is drawing correctly and combustion products are not spilling into the room.

Gas Safe ACS Practice Test

Gas Safe ACS Practice Test

ACS Appliance Installation 2