S Plan Heating System Drawing
How does an S-Plan Heating Organisation Work?
What is an S-Plan Heating Arrangement?
An S-Plan heating organisation is a organization that uses zone-valves (also known as two-ports)
S-Programme heating systems are now the virtually common type of arrangement installed in the UK subsequently Combination banality systems (which do non have whatever external motorised valves).
The S-plan is popular because it is versatile (you can add an unlimited number of zones), unproblematic to wire, and easy to fault find on.
Information technology also allows y'all to satisfy the need for a positive shut-off of water flow to an unvented cylinder (in gild to comply with G3 regulations) if the cylinder were to overheat.
How does a 2 port valve piece of work?
A ii-port (or Zone valve) has a permanent 230v supply (usually on the grey wire) plus a Neutral and an Earth wire.
There is then also a Motor Alive wire (ordinarily the brownish) and a Switch Live wire (ordinarily the orange).
When there is a call for heat from which ever excursion the 2-port is connected to (the timer and thermostat are both calling for heat) 230v is sent down the Motor Live (Brown) wire.
The motor within the valve turns, and opens the body of the valve, to let the heating pump to push water through it.
When the motor has pushed the valve all the fashion open, information technology also pushes down a microswitch which makes a circuit between the Permanent Live (Grayness) wire and the Switch Live (orange) wire.
Once there is 230V on the Orange wire, the boiler will burn down up and run until the demand is satisfied.
Once the demand is satisfied (either the timer is turned off, or the thermostat reaches the desired temperature) the ability to the Motor Alive (Dark-brown) wire is lost, so the valve body springs dorsum and shuts off the menstruum through the valve.
At the same fourth dimension, the microswitch making a excursion between the Permanent live (Greyness) wire and the Switch Live (Orange wire) is opened, so no power is now sent through the orangish wire and the boiler will stop running.
How do you wire upward an S-plan heating system?
To learn how to wire an Southward-programme System, y'all can either watch our video, or follow a wiring diagram such as the Honeywell wiring diagram beneath.
Common Faults on S-Plan Heating Systems
In that location are a few faults that we regularly come across on South-Plan systems..
Heating / Hot H2o volition not come on –
– Tin be acquired past faults with the external controls (non sending power to the Motor Live (Brownish) wire on the 2-port.
– This could as well be caused by either the Microswitch inside the valve being damaged (not making a excursion between the Permanent Live (Grey) and Switch Live (Orange Wires).
– Or past the body of the valve beingness seized and not assuasive the motor to turn (meaning the valve will not permit water to flow through it, and the microswitch wont be operated).
Heating / Hot H2o will not turn off –
– This is about oft cause past the microswitch sticking down. So even when there is no power on the Motor Live (Dark-brown) wire, there is still a circuit made between the Permanent Alive (Grey) and the Switch Live (orange wires).
– You will besides find the same fault if the valve trunk becomes stuck in the open up position, and the spring is unable to pull the body shut one time the Motor Live (Brown) wire loses power.
Radiators heat upward when Only the Hot water is turned on –
– This fault is usually due to system clay getting inside the torso of the 2-port valve. The dirt prevents the valve from closing all the mode and allows some water to flow through it fifty-fifty though it's in the Closed position.
– You can besides have this error if an Southward-Plan system is not plumbed in correctly. If the Cylinder Return is not the last pipe to tee into the Principal Return earlier the boiler, y'all volition get reverse apportionment through the radiator pipework.
Source: https://boilerboffin.com/s-plan-heating-system/
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