John Guest - The World Leader in Push-in Fittings, Pipe and Plastic Plumbing Systems

Technical Checklist - Underfloor Heating

NOTE: This checklist refers principally, but not exclusively, to fittings from our Underfloor Heating range prefixed JG and JGUFH. Other fittings, valves, tube and ancilliary products have their own Technical Specification.

Applications. Underfloor Heating Installations in solid floors.

Pipes 15mm JG Speedfit cross-linked polyethylene (PEX) Barrier Pipe to BS 7291, Parts 1 and 3 Class S.

Manifolds. Available in 4, 8 & 12 port options, the manifolds are manufactured from DZR brass and pre-assembled on fixing brackets. Each manifold comes complete with flow gauges, manual valves, drain and air bleed.

Pump Pack. Manufactured from DZR brass and pre-assembled, the pack includes Grundfos Alpha Pump, blending valve with temperature gauge, and flow thermostat.

Actuators. Available in 24v or 240v options, these attach to the individual circuits on the manifold and can be controlled by individual room thermostats via the wiring centre.

Wiring Centre c/w Night Set Back. Used to control the underfloor heating system up to 6 zones.

Wiring Centre. Used to control the underfloor heating system up to 8 zones in conjunction with Wiring Centre c/w Night Set Back.

Room Thermostat. Used to control the temperature of the system in individual zone.
Staples. 60mm Black Nylon for securing pipe to insulation board.
Staple Gun. Used to apply staples.

DO NOT USE Speedfit UFH Products for gas, fuel oil or compressed air applications.

Floor Insulation. Should be a suitable material and thickness to comply with current regulations.

Minimum Bending Radii. For Speedfit B-PEX Pipe is 175mm.

Expansion (PEX-Pipe) . 1% on length between 20°C and 82°C.

Cleaners, Inhibitors and Descalants. For advice on the replenishment of additives such as corrosion inhibitors, the following manufacturers should be contacted - Fernox Manufacturing Limited on 01799 550811 or Sentinel, BetzDearborn Limited on 0151 420 9595.
Paint and Chemicals. Only use water or oil based paint. DO NOT ALLOW CONTACT WITH cellulose based paints, paint thinners or strippers, solder flux or acid based descalants or aggressive household cleaning products.
Exposure to Sunlight. Spreedfit products, when used indoors, are not affected by sunlight. When used outdoors protect from ultra violet light by lagging or painting.
Pipe Inserts. Must be used on all installations when using plastic pipe and should be fully inserted.
Electrical Continuity. If Speedfit is used in an existing metal system which may have been used for earthing, electrical continuity should be reinstated.
Collet Clips. Collet clips provide added security against pipe disconnection and are available in white or in red or blue to allow for colour coding of pipes.
Pre-screed System Testing. To ensure the pipework has been installed correctly prior to the screed being laid, it is essential that the system is checked and hydraulically wet tested.
Testing should be carried out at 2 bar for 10 minutes and 10 bar for 10 minutes.

This testing. combined with other relevant checks, should reveal installation problems and is regarded as good plumbing practice.
Pressurisation During Screed Laying & Curing. In accordance with BS1264-4, the system should be left under pressure at a minimum of 6 bar for the duration of the laying and curing of the screed.
Under NO circumstances should the UFH System be used to quicken the screed process.
System Flushing. As is usual practice for any plumbing installation, flushing of the system prior to the use of JG Speedfit is recommended to remove any contaminants/chemical residue from elsewhere in the system.
Vermin. Speedfit products should not be used in vermin infested areas.

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