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Heating Controls Revision Flash Cards

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Unit 308 Electrical Science Principles - Outcome 7
Oliver Balay
Created by Oliver Balay
Oliver Balay
Created by Oliver Balay 7 months ago
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Question Answer
What is the primary purpose of a thermostat in a heating system?
Image: Thermostat Drayton (binary/octet-stream)
To sense and maintain the system's temperature near a desired set point by controlling heating or cooling devices.
Name two common sensor technologies used in thermostats.
Image: Bimetal Temperature Sensors (binary/octet-stream)
Bimetallic sensors and electronic thermistors.
Image: Ntc Ptc Thermistors (binary/octet-stream)
What temperature is usually adequate for a room thermostat in space heating systems?
Image: Thermostat Drayton (binary/octet-stream)
20°C (68°F)
Image: Thermostat Drayton (binary/octet-stream)
What is the recommended storage temperature for hot water to prevent legionella bacteria? 60°C (140°F).
Image: Legionella (binary/octet-stream)
What is the function of a cylinder thermostat?
Image: Cylinder+Thermostat (binary/octet-stream)
To detect the temperature of water in the cylinder and control the heating accordingly.
Image: Cylinder+Thermostat (binary/octet-stream)
What is the key difference between a zone valve and a three-port valve?
Image: 2 And 3 Port Valve (binary/octet-stream)
A zone valve controls water flow through a single pipe, while a three-port valve directs water to one of two outlets or both.
Image: 2 And 3 Port Valve (binary/octet-stream)
What is the advantage of a seven-day timer for heating systems?
Image: Honeywell 7 Day Heating Programmer (binary/octet-stream)
It allows for custom heating patterns for weekdays and weekends, optimising energy usage.
Image: Honeywell 7 Day Heating Programmer (binary/octet-stream)
What is the role of an electrically operated pump in central heating systems?
Image: Pump Central Heating (binary/octet-stream)
To circulate hot water through heat emitters such as radiators or underfloor heating.
Image: Central Heating System (binary/octet-stream)
What is hysteresis in the context of thermostats?
Image: Thermostat Drayton (binary/octet-stream)
The temperature difference between switching on and off to avoid frequent cycling of equipment.
Image: Hysterisis Thermostat (binary/octet-stream)
What is the purpose of contacts in zone or three-port valves?
Image: 2 And 3 Port Valve (binary/octet-stream)
To indicate the position of the valve and control associated equipment like pumps.
Image: 2 And 3 Port Valve (binary/octet-stream)
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