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HR100RMini Air Handling Unit -

For Ducted Ventilation With Heat Recovery

Installation and Servicing Instructions

Please leave these instructions with the user

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1.0 Introduction 4

2.0 Site Requirements 5

3.0 Installation 6

4.0 Electrical 10

5.0 Commissioning 11

6.0 Maintenance 12

7.0 Optional Extras 13

8.0 Notes 14

Section Page

Contents

1.0 Introduction

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1.1 Description

The Vent-Axia HR100R is a remote mounting unit toprovide balanced ventilation with up to 70%heat recovery for applications where there is noimmediate access to an external wall. TheHR100R is ideal for installations involving internalbathrooms and meets building regulationrequirements for this application.

A two speed motor provides for constant lowrate ventilation with a boost speed option. Freshpre-warmed air from outside is continuallyprovided to the room with simultaneousextraction of stale air and smells. Heat istransferred from outgoing air to the fresh airsupply with zero cross contamination,maintaining internal temperatures and providinga fresh environment.

2.1 Information

1. The unit must be sited and connected by asuitably qualified person and be in accordancewith current U.K. Building Regulations andI.E.E. Wiring Regulations (BS 7671).

2. The unit is intended for permanentconnection to the mains electrical supply.

3. The HR100R is intended for fixed wiringinstallation.

4. Ensure that the mains electrical supply iscompatible with the product’s rating label.

5. The unit must be sited away from directsources of heat in excess of 40°C.

6. Do not site the ceiling diffusers in the vicinityof excessive levels of airborne oil or grease.

7. If the ceiling diffusers are installed in a roomcontaining a fuel burning appliance, the installermust ensure that air replacement is adequatefor both appliances.

8. The external grilles must be sited a minimumof 500mm away from the flue of gas or open fireappliances. This is to avoid back flow of gasesentering the room.

9. All safety regulations and requirements mustbe strictly followed to prevent hazards to life andproperty both during and after installation andduring subsequent maintenance or servicing.

10. Ensure the mains electrical supply isisolated before commencing installation, ormaintenance.

2.0 Site Requirements

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3.0 Installation

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3.1 Installing the Unit

1. Check that all components have beendelivered, as identified in the delivery note.Notify the supplier of any errors or omissionsimmediately.

2. Check the diagrammatic ducting layoutdrawing to ensure that the proposed ductroutes, fan unit and air terminal locations canbe accommodated. If in doubt, refer to theTechnical Department.

3. The unit is designed to be mountedhorizontally. After noting the positions of theelectrical connector, duct spigots and drainageconnection for the unit, choose a suitableinstallation site for the unit. The most desirablelocation for the unit is normally within the roofspace.

4. Never locate the unit above a sleeping area.The most suitable position is normally abovethe landing or bathroom. The selected site mustallow adequate space around the unit for theremoval of the access panel and heatexchanger for maintenance and servicingpuposes.

5. When installing the unit, a suitable platformmust be made. This should be built fromchipboard or blockboard (19mm preferred). Thisboard should be raised enough to facilitate themounting of the unit above joist level.

6. The unit must be positioned so that thecondensate outlet can be trapped and thecondensate conveyed properly with acontinuous gradient to discharge through thegable or to the eaves gutter in the selectedlocation.

7. Connect the drainage system as appropriateusing PVC pipework, joined using PVC cementto ensure of watertight joints.N.B. The trap should be charged/filled beforeoperating the system, and should be checkedespecially in summer. Also note that a blockedcondensate outlet pipe due to insufficient pipegradient will quickly lead to water damage.

8. A shell bit is recommended for drilling holesin the ceiling to accomodate the housings forsupply and extract air terminals (SV100 andEV100). Make sure that you are not drilling intostructural members, water or gas pipes orelectrical cables and that there is room behindthe plaster board for duct access and securingring. Ceiling terminals should preferably befitted equidistant from adjacent walls bearing inmind that coving may already be fitted or maybe fitted at a later date.

E100R Unit

Joist Condensate Trap (50mm Min)

MountingPlatform

3.0 Installation

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3.1 Installing the Unit

9. Place the terminal housing in the hole in theceiling and secure to the back ring with the fourscrews provided.

10. For two storey new build properties it isrecommended that the ground floor terminalhousings are secured in position in advance ofthe plasterboard panels being fixed, byobtaining a sheet of plasterboard of the typeand thickness to be used. Cut a square of thesheet to just span two joists in the corner wherethe terminal is to be fitted. Remember that theedge of the sheet on the inner joist should onlyrest on half of the joist thickness. This allows afixing surface for the next sheet of plasterboardto be secured to when it is fitted. Tack up theplasterboard in position on the ceiling andconnect up and seal the duct and fittings.

11. For two storey existing properties it isnecessary to lift the floor coverings at first floorlevel above the terminal positions to gainaccess to the terminal housings to secure andseal the duct and fittings.

12. Fix in position all vertical supply and extractair ducting being conveyed between groundfloor ceiling level and the loft space.

13. The external grilles for intake and exhaustair should be positioned so that the exhaust airis not drawn in again.

14. If the grilles are fitted in the same gable atthe same height, a minimum of 1m betweengrilles is recommended.

15. If the grilles are positioned above oneanother the distance apart should be at least1m with the exhaust grille at the top.

16. Roof ventilators placed on the same roofsurface should be positioned at the samedistances as the grilles.

17. Always ensure that all exhaust grilles/roofventilators are placed higher than the top edgeof the highest window and at a distance of atleast 1m from the nearest window.

Terminal Housing

Plaster Board

Securing Ring / Back Plate(for fire valves)

Securing Screw

Terminal

3.0 Installation

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3.1 Installing the Unit

18. External grilles placed in the soffit shouldbe positioned at the same distances asindicated for gables.

19. The Quicktube Rigid UPVC duct systempermits fast, easy assembly whilst ensuringpressure-proof system sealing.

20. The ducts are delivered in lengths of 3mand are easily shortened as required with aduct saw or a similar fine toothed saw. Werecommend that you file the edges of the ductsafter shortening.

21. Assemble the duct and fittings, following asclosely as possible the diagrammatic ductinglayout. Ensure that the duct is raised abovejoist level to allow for thermal insulation of theducting.

22. Each straight length of duct is assembledusing a flexible connector (QTC) to join the twoends, whilst 90° and 45° diversions andbranches are accomplished with flexible fittings(QTB90, QTB45 and QTET). The duct is a pushfit into the socket of the connector and fittings.

23. Once assembled the joints are secured withduct tape (DT30) to provide an airtight seal.Ensure that the tape is secured over thecomplete joint area to provide an airtight seal.

24. If the loft space is unheated the unit andducting will require to be thermally insulated topreclude condensation occuring and tominimise heat loss. This requirement must beobserved in the planning and routing of theduct system.

25. The insulation recommended is Alreflex 1L1which comprises 3mm thick polyethylenebubble sheet laminated on the external surfacewith aluminium foil protected by a thinpolythene film. The product is CFC and HFCfree and has a surface spread of flame of Class1 tested to BS476 Part 7/971. It should,however, be protected from open flames orsparks and stored apart from highly flammablematerials.

3.0 Installation

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3.1 Installing the Unit

26. The material provides resistance to heatloss from the distribution ducting and a highlyeffective vapour barrier when all joints aresealed with metallised tape. It is light but robust,not easily damaged in storage or duringconstruction and is rot proof, water and vapourresistent, durable and can be expected toremain an effective insulant for the normal lifespan of a building.

27. The insulation is supplied in 1.5m longpreformed sections for application to the ductingat the time of installation. All joints should besecured using the metalised tape (DTA30)provided to ensure that a continuous vapourseal is maintained.

28. The use of flexible ducting should be limitedto an absolute minimum. If used it should befully stretched in order to minimse pressureloss.

29. Offer the unit on to the mounting surface,ensuring that it is not susceptible to movementunder operation. Use directional airflowindicators on the top of the unit to ensure thecorrect connection to external and internalvents.

30. Mate up the ducting as appropriate,ensuring that the airflow is in line with thedirectional indicators.

31. Determine the most appropriate sitingposition for the appropriate control. Normally,this would either be a manual control switch(NBSW), pull-cord switch (PCSW) humidityswitch (HS6) or speed control switch(VCON100).

32. Determine the appropriate wiringconnections as outlined within section 4, andwire in accordance with current IEE WiringRegulations, ensuring that the mains feed isisolated before making any connections.

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4.0 Electrical

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4.1 Electrical Connections

230V 50Hz 12W (normal) 31W (boost)

NOTE: Wiring must be via a 3A fusedswitched spur with a 3mm contact separationin each pole. The wiring should be suitably(BASEC or HAR) approved cable ofappropriate current carrying capacity.

HR100R Terminals 3 amp fused supply

L

L

N Neutral

LiveBlack

Brown

Blue

Green/YellowEarth

1

2

HR100R Terminals 3 amp fused supply

L

L

N Neutral

Live

Black

Brown

Blue

Green/YellowEarth

1

2

HR100R Terminals

3 amp fused supply

L

L

N

Neutral

Live

Black

Brown

Blue

Green/Yellow

Earth

1

2

L

N

HR100R Terminals3 amp fused supplyL

L

N Neutral

Live

Earth

1

2

HR100R Terminals

3 amp fused supply

L

L

N Neutral

LiveBlack

Brown

Blue

Green/Yellow Earth

1

2

1

0

2

Continuous Normal Speed

Continuous Boost Speed

VCON100: Manual Normal to Boost SpeedSwitching and ON/OFF Control

NBSW and PCSW: Manual Normal to BoostSpeed Control

HS6: Automatic Normal to Boost Speed Control

1

0

2

L

SL

N

TIM2 Terminals

Neutral

LinkLight fitting if appropriate

Switched live

Mains via switchedfused spur

Live

Earth

HR100R Terminals

L

L

N

HR100RTerminals

3 amp fused supply

Neutral

Live

Switched Live

Light

Earth

L

L

N

1

2

For units switching to boost on operation of a light switch, anin-line timer (order code TIM2) should be wired into the circuitas shown below.

Automatic ControlThe HR100R unit operates on continuous trickle ventilation.Operation of switch turns unit to boost ventilation. When switchis turned off units continue to operate on boost for a presetperiod - adjustable 2-30 minutes.

The HR100R MUST NOT be wired in conjunction with a lightswitch, units will fail.

5.0 Commissioning

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5.1 Commissioning the System

Before starting to commission the system checkthe following:a) All ducting is in place and secured.b) The wiring is secure and correctly connected.c) The trap is in position, charged and willenable efficient removal of condensate.d) The unit is mounted appropriately in aposition not susceptible to movement ordamage.

The scope of the commissioning procedurecomprises:

1. Balancing the two airflows to achievemaximum heat exchanger efficiency.

2. Adjusting the two airflows to obtain the overallairflow rates and the individual terminal air flowrates as specified on the air change schedule.

3. An airflow meter must be used to set thecorrect airflows.

NOTE: The supply air terminal device isdirectional and incorporates a deflector plate.Ensure that the deflector plate is correctlypositioned so that the active part of theterminal device is discharging to the room.

4. Set the control switch (NBSW or PCSW) tonormal speed or set the humidistat (HS6) atmaximum and check that air is flowing in thecorrect direction at each terminal point.

5. Standard ceiling terminals type EV100 andSV100 are adjusted by turning the central screwand are locked in the “set” position by thelocknut.

6.0 Maintenance

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6.1 Cleaning the Unit

In addition to removing odours, providing freshair and recovering heat, this unit extractsairborne impurities such as dust, dirt andgrease. These gradually build up and detractfrom the efficiency and appearance of the unit.

To ensure optimum performance, the unitshould be cleaned every three to six months orat periods determined by the level ofcontamination experienced, and according tothe following procedure.

1. Isolate the mains power supply.

2. Remove the four securing screws from eitherend of the cover.

3. Remove the cover.

4. Remove the heat exchanger from the unit.

5. Wash the heat exchanger in warm waterusing a mild detergent and dry thoroughly.Keep water away from all electrical componentsand wiring within the unit.If the filter cannot be cleaned, replacement isrecommended.

6. Reassemble in reverse order. The heatexchanger should be repositioned with the ‘Top’label facing the front and pointing upwards.

Heat Exchanger

Securing Screws

Securing Screws

Cover

7.0 Optional Extras

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7.1 Ancillary Equipment

Internal Supply ValveRef: SV100Adjustable supply valve with 80mm long,100mm diameter spigot connection. Valvedesign ensures horizontal discharge of air foroptimum diffusion. Moulded in white plastic, theEV100 valve is suitable for both ceiling and wallmounting and is 150mm diameter overall.

FilterRef: F100Coarse in-line filter complete with reticulatedfoam element. Compatible with 100mmdiameter ducting.

External Push-Fit Wall VentRef: WC1400mm long brown plastic duct and externalgrille with vaned rubber seal for push fitinstallation in external walls. Fits into pre-drilledhole of 115mm diameter.

External Dual Wall VentRef: WC2Combined supply and extract terminal with greyplastic external cowl, with 100mm diameterducting. This vent is ideal for exposedinstallations.

External Louvre Wall BoxRef: WL100Anodized aluminium external weather louvrewith metal wall box 130 x 130mm and 174 x174mm grille. 100mm diameter spigotconnection.

Ventilating Roof TilesRef: VT100Moulded ventilation terminal tiles, available in arange of sizes, profiles and colours. 100mmdiameter spigot connection.

In-Line HeaterRef: ILH100Compatible with 100mm ducting, the ILH100provides a boost heat facility when required.

Flexible DuctingRef: AFD100Aluminium ducting in 10m lengths.Ref: ACD100Acoustically insulated ducting in 6m lengths.Ref: IFD100Thermally insulated ducting in 6m lengths.Ref: PFD100PVC ducting in 6m lengths.

Quicktube 100mm rigid plastic ducting can alsobe used in conjunction with the HR100R unit. Fordetails please see data sheet.

Speed Control SwitchRef: VCON100White plastic single gang switch for ON/OFFcontrol and NORMAL/BOOST speed control ofHR100R unit.

Speed Control SwitchRef: NBSWWhite plastic single gang switch forNORMAL/BOOST speed control of HR100R unit.

A metal black box for flushing mounting (Ref: MBB) and plastic back box for surfacemounting (Ref: PBB) are available for use withthe above controllers.

Pullcord Control SwitchRef: PCSW2 way ceiling mounted switch forNORMAL/BOOST speed control of HR100R unit.A second PCSW can also be used for ON/OFFcontrol.

Humidity SensorRef: HS6Electronic humidity sensor with changeoverrelay output and adjustable switching point from60% to 100% RH. In built temperaturecompensation (night time setback).Contamination protection sensor.

TimerRef: TIM2Remote mounting timer box to provide ON/OFFcontrol or switching between the 2 speeds onoperation of switched live. Over-run periodadjustable 2-30 minutes.

Internal Extract/Supply GrilleRef: ESG100White plastic louvre grille designed to fit in thewall or ceiling and serves both extract andsupply functions. 100mm diameter spigotconnection.

Internal Extract Valve Ref: EV100Adjustable extract valve with 80mm long,100mm diameter spigot connection. Moulded inwhite plastic, the EV100 valve is suitable forboth ceiling and wall mounting and is 150mmdiameter overall.

8.0 Notes

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Vent-Axia LtdFleming Way

CrawleyWest sussexRH10 9YX

www.vent-axia.com

Comp No 370666 - Iss C - 0310