- Polypipe
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1. the floor and a small section of floor plate should be cut away to allow the pipes to exit the floor at the correct position These elbows should be covered with Polystyrene prior to and during screeding to allow for future excavation if required Alternatively they can be enclosed within a Polyplumb Junction Box Zonal Regulation Unit ZRU For 3rd Thermostatic 7 Pump circuit if Blending required Valve ET l 4 lt Ti p ZE g p AB Heating Heating UFH Underfloor Return Flow Returns Heating Flows Pipe Thermostat fig 1 Patent pending Connections to the existing wet heating system The pipe work connections to the ZRU are for 15mm diameter pipe and the ZRU should not be connected to the system from any pipe smaller than 15mm A small number of boilers can be affected hydraulically by the use of a second pump in the system NOTE Check with the boiler manufacturer to ensure compatibility with the ZRU The preferred connection to the ZRU is to the main flow and return pipe work of a 2 pipe system i e typically from 22mm distribution pipe work However it can also be connected to the nearest existing radiator Pipe connection to operat2. in all poles that provides full disconnection under overvoltage category Ill The means for disconnection must be incorporated in the fixed wiring in accordance with the wiring rules If in any doubt contact a qualified electrician The wiring diagram is as shown NOTE The water temperature must be 45 C to operate the unit Room Thermostat example Not supplied Remove link if using room stat Mains fused spur 3 amp L N E ZRUINST Polvpipe 80mm MINIMUM WALL CLEARANCE WIRING FOR MIXING VALVE ADJUSTMENT MODULE MIXING VALVE SCREW FIXING POSITIONS BOILER RETURN BOILER FLOW HEATING LOOP S RETURN HEATING LOOP S FLOW
3. ZRU INSTALLATION GUIDE UNDER FLOOR HEATING TO SINGLE AREAS UNDER 30m OR CONSERVATORIES UTILISING THE POLYPIPE ZONAL REGULATION UNIT ZRU PB970028 Introduction The Polypipe Zonal Regulation Unit ZRU allows single rooms and extensions up to 30m to be connected to an existing heating system without time consuming and expensive hydraulic and electrical alterations When connected to an existing radiator heating system the ZRU converts the water flow and temperature to that suitable for underfloor heating e The ZRU boosts flow ensuring that the underfloor system is not reliant on existing pump pressure e Water is thermostatically blended to provide the ideal safe flow temperature control e Sensors within the unit ensure operation only occurs when heat is available from the existing heating system e Room thermostat regulates air temperature in the space being heated e Although designed to be surface mounted in the heated area the ZRU can be positioned elsewhere within the property e The ZRU can be used in both domestic and commercial buildings e As the ZRU thermostatically controls water temperature the unit can also be used where low surface temperature heating by radiators is required Pipe Connections at ZRU Provision for two heating circuits is provided on the ZRU If only one circuit is required blank off the unused ports with spigot blanking plugs Elbows should be used underneath the ZRU to exit pipe from
4. e underfloor heating at the same time as the boiler f Connection Ba from main 01 0 MiO ji distribution ete pipe work i Connection i r from Bon radiator The diagram above shows the ZRU connected to operate with the boiler on off firing Due to the quick response of low mass systems Overlay Overlay Lite MHP etc this is likely to be suitable Using this method for solid floor installations may require the timings of the existing heating to be altered to allow the underfloor heating system to reach comfort temperature If the room is to be controlled independently of the existing central heating system a zone valve needs to be installed between the boiler and the ZRU Pipe connection to operate ZRU underfloor heating independently Programmable room thermostat t Oi C i 5 p connection i 3 rom main i S Gi distribution H L pipe work J a Nu Zone valve to radiator etc Operational Sequence Installation of ZRU 1 Heating water from the existing system is pumped through the heating flow by the existing heating pump and returns through the heating return forming a simple loop 2 The pipe thermostat senses that heating water is available i e when the main heating system is on and sends a live signal to the pu
5. g positions Drill wall and fix plugs Fitting the ZRU Step 1 Screw unit to wall Connecting the ZRU Step 2 Connect heating pipe work via an isolation valve Step 3 Connect underfloor heating circuit s using an isolation valve Use tees and spigot elbows to form connections for 3rd circuit systems Step 4 Connect mains wiring as diagram below via a fused spur Filling All Systems The pipe system should be filled usually by means of a hosepipe prior to screeding or floor covering if the ZRU is to be installed at a later time than the underfloor circuit e g to allow for plastering etc Pipework should be temporarily capped and remain full of water preferably at pressure Special precautions are necessary if the pressure testing is to take place in sub zero temperatures Wiring Details This appliance can be used by children aged from 8 years and above and persons with reduced physical sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved Children shall not play with the appliance Cleaning and user maintenance shall not be made by children without supervision All electrical installations must be in accordance wit the latest version of the relevant legal requirements The ZRU must be installed with means for disconnection from the supply mains having a contact separation
6. mp NOTE The water temperature must be 45 C to operate the unit 3 If the room thermostat if fitted is also calling for heat the pump operates 4 A mixture of heating flow and underfloor heating return water is drawn through the thermostatic blending valve at the correct temperature and pumped into the underfloor heating 5 As the room reaches temperature the room thermostat will break the live signal to the pump and stop the pump from operating 6 As the boiler shuts down and the main heating flow cools the pipe stat will break the live signal to the pump and stop the pump from operating Zonal Regulation Unit ZRU For 3rd Thermostatic Pump circuit if Blending required Valve S L is il LJ M KI Underfloor Heating Heating UFH Return Flow Returns Heating Flows Pipe Thermostat fig 1 Performance 8 safety data info 1 Maximum ambient air temperature is 60 C at 95 C fluid temperature 2 Pressure rating is PN6 The ZRU can be positioned either in the room where the underfloor heating is installed or in an adjacent area 100mm from the finished floor level to allow for pipe connections Tape fixing template to wall showing fixin
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