Unvented Hot Water Storage Servicing Guide

What should the service engineer have available before starting the hot water cylinder service?

• A set of tools

• A service manual

• Replacement parts

• All of the above

Which of the following are existing issues with the system that should be checked?

• Performance bottlenecks

• Security vulnerabilities

• User interface glitches

• All of the above

What should be visually checked on the cylinder for any obvious defects?

• The surface of the cylinder

• The color of the cylinder

• The weight of the cylinder

• The height of the cylinder

Identify the type of expansion system used. What are the two types mentioned?

• Type A and Type B

• Type C and Type D

• Type E and Type F

• Type G and Type H

For a separate expansion system, what steps should be followed to depressurize the cylinder?

• Open the valve slowly to release pressure.

• Close the valve tightly to maintain pressure.

• Increase the pressure by adding more fluid.

• Ignore the pressure and continue operation.

How long should water be run through each valve to ensure any loose scale build-up or debris is flushed through before sealing?

• 1-2 minutes

• 3-5 minutes

• 6-8 minutes

• 9-10 minutes

What should the service engineer check while inspecting the safety valve operation?

• Pressure settings

• Valve alignment

• Leakage

• All of the above

Why might it be necessary to over-ride the programmed time settings when checking interlocks with external controls?

• To ensure synchronization with external systems

• To maintain the original settings

• To avoid any manual intervention

• To reduce the complexity of the system

The recommended storage temperature for hot water in most storage cylinders is:

• 50°C

• 60°C

• 70°C

• 80°C

What should be ensured when checking the outlet temperature to avoid reducing the hot water temperature at the outlet?

• Ensure the outlet temperature is above the minimum required level.

• Check the inlet temperature regularly.

• Use a thermometer to measure the temperature.

• Maintain a constant flow rate.