Podcast
Questions and Answers
Which type of shower valve relies on a sensing device that expands and contracts to maintain the desired water temperature?
Which type of shower valve relies on a sensing device that expands and contracts to maintain the desired water temperature?
- Pressure balancing mixer valve
- Manual shower mixer valve
- Bath/shower mixer tap
- Thermostatic mixer valve (correct)
For a cistern-fed shower system, what is the primary reason for requiring a minimum head height from the base of the CWSC (Cold Water Storage Cistern) to the shower rose?
For a cistern-fed shower system, what is the primary reason for requiring a minimum head height from the base of the CWSC (Cold Water Storage Cistern) to the shower rose?
- To provide sufficient pressure for adequate shower flow (correct)
- To ensure the water is stored at the correct temperature
- To prevent the shower from overheating
- To allow for easier maintenance of the shower system
In a shower system, what is the purpose of using an Essex flange when connecting to a cylinder?
In a shower system, what is the purpose of using an Essex flange when connecting to a cylinder?
- To regulate the water temperature
- To increase water pressure
- To prevent air from entering the system (correct)
- To filter the water supply
Which of the following best describes how a single impeller booster pump is typically used in a shower system?
Which of the following best describes how a single impeller booster pump is typically used in a shower system?
In which type of shower system is a pressure-reducing (regulating) valve most likely to be required?
In which type of shower system is a pressure-reducing (regulating) valve most likely to be required?
What is the defining characteristic of an 'unbalanced feed' shower system?
What is the defining characteristic of an 'unbalanced feed' shower system?
In an unbalanced feed system, what component is crucial for ensuring a consistent shower temperature and preventing fluctuations?
In an unbalanced feed system, what component is crucial for ensuring a consistent shower temperature and preventing fluctuations?
What is the primary power source for an instantaneous electric shower?
What is the primary power source for an instantaneous electric shower?
A shower blender's safety catch is typically set between 38°C and 42°C. What is the purpose of this safety feature?
A shower blender's safety catch is typically set between 38°C and 42°C. What is the purpose of this safety feature?
Which of the following is a key consideration when determining the appropriate type of shower installation?
Which of the following is a key consideration when determining the appropriate type of shower installation?
Why is it important to position a booster pump as close as possible to the hot water cylinder in a shower system?
Why is it important to position a booster pump as close as possible to the hot water cylinder in a shower system?
In a cistern-fed shower system, why is the cold water feed to the cylinder typically positioned higher than the cold water outlet for the shower?
In a cistern-fed shower system, why is the cold water feed to the cylinder typically positioned higher than the cold water outlet for the shower?
What is the primary function of a twin impeller booster pump in a shower system?
What is the primary function of a twin impeller booster pump in a shower system?
The 'golden rules' mention a maximum temperature for a pump with temperature control featuring a bypass on the whole house. What is this temperature?
The 'golden rules' mention a maximum temperature for a pump with temperature control featuring a bypass on the whole house. What is this temperature?
What is the significance of using 22mm piping for the feed pipes in a cistern-fed shower system until just before the mixer valve, where they reduce to 15mm?
What is the significance of using 22mm piping for the feed pipes in a cistern-fed shower system until just before the mixer valve, where they reduce to 15mm?
What is a key advantage of a mains-fed hot and cold shower system compared to a cistern-fed system?
What is a key advantage of a mains-fed hot and cold shower system compared to a cistern-fed system?
What is the function of the 'in-line strainer' in a mains-fed hot and cold shower system setup?
What is the function of the 'in-line strainer' in a mains-fed hot and cold shower system setup?
In the context of booster pumps, differentiate between 'positive head' and 'negative head' systems.
In the context of booster pumps, differentiate between 'positive head' and 'negative head' systems.
Why is a dedicated feed – hot and cold – and correct pipe size so critical to feeding a shower pump?
Why is a dedicated feed – hot and cold – and correct pipe size so critical to feeding a shower pump?
In a mains-fed hot and cold system, several components are typically used. What is the purpose of the 'Tundish'?
In a mains-fed hot and cold system, several components are typically used. What is the purpose of the 'Tundish'?
Why would an unvented hot water system be preferred over a vented system?
Why would an unvented hot water system be preferred over a vented system?
When might a pressure compensating valve be used?
When might a pressure compensating valve be used?
What causes aeration in a hot water system, and how can it be prevented?
What causes aeration in a hot water system, and how can it be prevented?
What is the purpose of an expansion relief valve in a mains-fed hot and cold system?
What is the purpose of an expansion relief valve in a mains-fed hot and cold system?
What are the potential consequences of the pump running dry?
What are the potential consequences of the pump running dry?
Flashcards
Bath shower mixers
Bath shower mixers
Mixes water from bath and shower taps.
Manual shower mixers
Manual shower mixers
Regulates water temperature and flow manually.
Thermostatic Mixer Valve
Thermostatic Mixer Valve
Maintains a stable water temperature by blending hot and cold water.
Pressure balancing mixer
Pressure balancing mixer
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Cistern fed showers
Cistern fed showers
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Cistern fed with booster pump
Cistern fed with booster pump
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Mains fed with water heater
Mains fed with water heater
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Unbalanced and balanced
Unbalanced and balanced
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Instantaneous electric shower
Instantaneous electric shower
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Equal Shower Pressure
Equal Shower Pressure
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Positive Head
Positive Head
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Negative Head
Negative Head
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Thermostatic valve
Thermostatic valve
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CW Storage
CW Storage
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Pump Position
Pump Position
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Feeding the pump
Feeding the pump
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Flange connection
Flange connection
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Temperature control
Temperature control
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Expansion vessel
Expansion vessel
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Unbalanced Feed
Unbalanced Feed
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Water Heater
Water Heater
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Mixer Valve
Mixer Valve
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Single Impellor pump
Single Impellor pump
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Twin impellor pump
Twin impellor pump
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Shower Installation
Shower Installation
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Study Notes
- Design features of showers.
- Learners are expected to identify the requirements for various shower designs.
Design Features of Showers
- Bath shower mixers are a type of shower mixer.
- Manual shower mixers are a type of shower mixer.
- Thermostatic Mixer Valves are a type of shower mixer.
- Pressure-balancing mixers are a type of shower mixer.
- Cistern-fed showers.
- Cistern-fed showers with a booster pump.
- Mains-fed showers with a water heater.
- Unbalanced and balanced showers.
- Instantaneous electric showers.
- There are different types of shower mixer valves available.
- The installation method is very similar in most cases.
- Equal (balanced) pressure and flow rates are required on both hot and cold feeds.
Cistern Fed Showers
- Both hot and cold water are fed from the CWSC (Cold Water Storage Cistern).
- It requires equal pressure.
- The thermostatic valve is the safest to use, which will compensate for any temperature fluctuations.
- A minimum head of 1 meter is required from the base of the CWSC to the outlet of the shower rose.
- The feed pipes should be 22mm until reducing to 15mm just before the mixer valve.
- Low pressure system relys on gravity to give the pressure.
The Thermostatic Valve
- The thermostatic valve relies on a sensing device that expands and contracts to maintain the required temperature.
Cistern Fed Showers with Booster Pump
- A twin impellor booster pump increases pressure for both hot and cold feeds.
- Connect to cylinder via an Essex flange, which avoids any ingress of air.
- Connect to the cylinder via an angled hot water distribution pipe, which allows air from the cylinder to migrate up to the vent pipe passing the shower feed
- A single impeller booster pump can be used after the mixer valve.
- It boosts the water pressure to the shower head.
- It is commonly used on deluge or drench-type shower heads.
Positive Head
- Operated by a flow switch under natural flow of water.
Negative Head
- Operated by a flow switch under a charge.
The Golden Rules
- CW storage: capacity (don't pump dry); height of CWSC (positive or negative).
- Pump position must be as close to the cylinder as possible; a pump must push – not pull – water.
- A dedicated feed – hot and cold; correct pipe size is required for feeding the pump.
- Use a Surrey or Essex flange connection to stop aeration.
- Temperature control: a pump can only cope with temps up to 65°C max (bypass on whole house).
- The safety catch on shower blenders is set at 38°C to go up to 42°C.
Mains Fed Hot and Cold
- Fed from an unvented hot water system or a water jacket heater or combination boiler.
- It is a high-pressure system.
- No pump is necessary, as both hot and cold are fed from the mains.
- A pressure-reducing (regulating) valve is required.
- Large amounts of water are delivered to the shower at a regulated pressure.
Unbalanced Feed
- Showers are fed from a combination boiler or instantaneous water heater.
- A slight pressure loss occurs as cold water passes through the heater.
- A pressure-compensating shower valve is required.
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