Polyplumb Underfloor Heating Installation Guide

There are six stages to successfully jointing the Polyplumb system. These instructions apply to Polyplumb when used in hot and cold water or heating applications, including under floor central heating.

1a. Cutting Polyplumb pipe

Always use one of the approved pipe cutters (Code PB777). A slight rotation of the pipe when cutting will help make the operation easier. Never use a hacksaw. Wherever possible, cut on a depth insertion mark, these “K” shaped marks are equally spaced along the pipe and indicate the depth required for full insertion into a Polyplumb socket fitting.

1b. Cutting Copper Pipe for insertion into a Polyplumb fitting

Wherever possible, use a rotational pipe cutter when cutting copper pipe. Ensure that all cut ends have a rounded lead in, with burrs removed. Never use a hacksaw. You will need to mark the depth insertion on the pipe, the insertion depths are shown in the table.

2. Use of pipe stiffener

Pipe stiffeners are an integral part of the joint when using Polyplumb pipe with either Polyplumb fittings or compression fittings and need to be fully inserted in to the pipe end. They are not required when using copper pipe.

3. Visual check of fitting & fitting components

Although every single socket is visually checked during the manufacturing process to ensure that all components are present and in the correct order, a further visual check is recommended as tampering by others can take place on site or during distribution. The cap should be hand tight only.

Caution - Do not insert fingers into the Polyplumb fittings, as the grab ring is sharp and designed to grip.
Note: Components shown in dismantling section.

4. Insert pipe fully into fitting

The pipe should be inserted into the fitting to full socket depth such that the insertion depth mark aligns with the outer end of the cap nut on the fitting.

5. Grab ring check

A quick tug on the pipe will confirm that the pipe is inserted past the grab ring and that a grab ring was present in the fitting. It does not however ensure that the pipe is fully inserted as this can only be confirmed by using the depth insertion mark.

6. Avoidance of Re-jointing - WARNING!

On no account should a pipe be removed from a jointed Polyplumb fitting by removing the cap-nut and withdrawing the pipe end complete with all the socket components from the fitting to be rejointed without
removing and replacing the grab-ring into the fitting and re-making the joint in accordance with the normal Polyplumb jointing procedure.

If the pipe end complete with all the socket components is subsequently re-jointed into the body of a fitting, there is a risk that the outer edge of the grab-ring could catch on the outer end or the inside surface of the socket of the fitting which forces the grabring into an angled position on the pipe. Forcing the grab-ring into an angled position on the pipe in this way, seriously damages the grab-ring teeth and will reduce the pullout
performance of the joint when subjected to pressure, such that premature failure will almost certainly occur.