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How to use a changeover gas regulator?

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Switching the gas supply – automatic

Auto changeover gas regulator showing green indicator and lever facing left Changeover gas regulators are available in both manual and automatic versions. If yours is automatic, the regulator will switch over to the fresh cylinder on its own when it senses that the pressure of gas in the first cylinder has fallen below a certain point. This means the lever will have already turned to face the reserve cylinder by the time you come to replace the empty one.

Switching the gas supply – manual

Manual changeover gas regulator with lever pointing right to service cylinder

Step 1 – Check which cylinder is empty

When the gas supply runs low, the lever will still be pointing towards the cylinder you’ve been using – the service cylinder. This is the one that needs changing.

Manual changeover gas regulator with arrows showing lever being turned to left

Step 2 – Switch supply to reserve cylinder

Turn the lever on the regulator anti-clockwise until it’s pointing towards the cylinder on the other side.

Manual changeover gas regulator showing lever facing left The lever should now be pointing at the reserve cylinder. This becomes the service cylinder, as it’s the one currently in use.

Changing a gas cylinder

Cracked hose

Step 1 – Check hoses

Make sure the hoses are long enough, but not too long or they could become tangled. Hoses, also called pigtails, on changeover regulators should be no more than 1m long.

Check the condition of the hoses too, and replace them if there is any sign of damage such as cracks, kinks, nicks or crushed areas.

Arrows showing cylinder valve being turned clockwise to turn off gas

Step 2 – Turn off gas

Switch off the gas supply on the cylinder that you’re going to replace by turning the valve wheel clockwise.

Loosening locking nut with gas spanner

Step 3 – Undo locking nut

Take a gas spanner and carefully loosen the locking nut where it’s attached to the cylinder valve.

Checking sealing washer on end of hose

Step 4 – Check sealing washer

Before reconnecting the hose, have a look at the rubber sealing washer to make sure it’s still in good condition and replace it if there are any cracks. A perfect fit is important to prevent leaks.

Making sure there is enough slack in hose on new gas cylinder

Step 5 – Put new cylinder in place

Remove the empty cylinder and put the new one in place, checking that there is enough slack in the hose. The cylinder must remain upright at all times. If you accidentally drop it, pull it back up and leave the contents to settle for several minutes before connecting.

Turning cylinder valve clockwise to make sure gas is turned off

Step 6 – Check gas is off

Turn the cylinder valve clockwise to make sure the gas is switched off, then remove the dust cap.

Attaching hose and tightening locking nut anti-clockwise

Step 7 – Attach hose

Push the hose on as far as it will go then tighten the locking nut by turning it anti-clockwise, finishing off with a spanner. Be careful not to over-tighten or you could damage the nut.

Turn cylinder valve anti-clockwise to switch gas back on

Step 8 – Turn gas on

Switch the gas back on by turning the cylinder valve anti-clockwise.