Ideal Heat Exchanger O-Ring HIU 177647

The Ideal 177647 is a heat exchanger O-ring supplied for Ideal Commercial HIU (heat interface unit) equipment. It is a moulded sealing ring that sits at the heat exchanger connection, where it compresses between the mating faces to stop water escaping from the joint. As a service item it is replaced whenever the joint is broken down or the existing seal has hardened, flattened or perished.

• Water weeping or dripping from the heat exchanger joint inside the HIU casing
• A visible trail of scale or corrosion staining around the connection
• The O-ring feels hard, brittle or flattened once the joint is opened
• The ring is cracked, nicked or swollen after removal
• A leak that returns shortly after the joint has been re-tightened

• Confirm the part number 177647 against your appliance documentation or the label on the unit
• Check the alternative number 1180507 if you are matching against an older parts list
• Inspect the mating faces and the O-ring groove for scoring, scale or debris before fitting a new seal
• Have the correct sealing washers or gaskets to hand if the surrounding joints are also being disturbed
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.