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nuaire.co.uk 

029 2085 8400

28. 07. 20. Leaflet Number  671838

Installation and Maintenance

The MRXBOXAB-ECO4-1Z Range of Units

2.5 Extract/Input Areas

The unit is designed to extract air from all wet rooms e.g. bathroom, 

kitchen, en-suite, utility room (with sink).  WC’s do not need to be 

ventilated if openable windows are fitted.
Supply air should be to all habitable rooms e.g. bedrooms and lounge. 

Extract / input grilles should be adjustable valve types (not supplied). 

External grilles are to have a minimum free area of 12,250 mm

2

.

2.6 Ducting

Before commencing ducting installation, reference should be made 

to building regulations document “Domestic ventilation compliance 

guide”. This document supports ADF2010 and details installation, 

testing and commissioning of all ventilation systems.
If the enclosure is to be used in conjunction with an ancillary 

distribution box (MRXBOX-DB4) refer to additional assembly 

instructions supplied with the MRXBOX-DB4 as requirements will 

differ.

2.7 Ventilation Flow Rates

Table 1. ADF 2010 - Extract ventilation rates.

Table 2. Whole dwelling ventilation rates.

Notes:
1. In addition, the minimum ventilation rate should be no less than 

0.3 l/s per m2 of internal floor area.  (This includes all floors, e.g. 

for a two-story building add the ground and first floor areas).
2. This is based on two occupants in the main bedroom and a single 

occupant in all other bedrooms. This should be used as the default 

value. If a greater level of occupancy is expected add 4 l/s per 

occupant.

IMPORTANT

Any air intake terminal MUST be installed in accordance with 

the appropriate regulation.

As a guide, the BS5440 series of British Standards deals with this issue 

and currently states that an air intake must be at a minimum distance 

of 300mm from a gas boiler balanced flue.

Installers are advised to be aware of the requirements of this standard 

when installing ‘through the wall’ supply air ducting.

Room

Min high rate

Min low rate

Kitchen

13 l/s

Total extract rate 

should be at least 

the whole dwelling 

ventilation rate given 

in table 2.

Utility Room

8 l/s

Bathroom

8 l/s

Sanitary 

Accommodation

6 l/s

Number of bedrooms in dwelling

1

2

3

4

5

Whole dwelling 

ventilation rate 

(l/s)

1,2

13

17

21

25

29

1. The condensate must be discharged under a water level in a U-trap 

drainpipe or an alternative drain method which acts as an airlock. 

2. The condensate discharge drain is a 32mm male threaded 

connection. 

3. If using a U-trap, please ensure the U-trap has been filled to a 

suitable level of water to avoid any air locks.

4. If the condensation pipe is fitted in an unheated space the pipe 

should be in insulated to prevent freezing.

Nuaire recommend MVHR-DRAIN be used as the primary 

condensate take-off (see Figure 8 &  ).

Min 5

Drop

Collar

To SVP 

“T” piece 

MVHR Drain 

To unit 

To CONTRAP 

Figure 7. Wet option: 

Condensate pipe connection 

to unit and a typical 

example of a “U” trap 

drainpipe 

(Standard 

configuration only).

Figure 8. MVHR-DRAIN option: Condensate 

drain, uninsulated drain pipe with min 5° fall 

running to SVP.

Figure 9. IMPORTANT: When using a “T” Piece to connect the 

CONTRAP drainage and the MVHR drain pipework, the MVHR 

drain must always be fitted before the “T” Piece to prevent 

condensate from feeding back into the MVHR system.

Otherwise fit 4x 200mm diameter spigots with the M4 screws supplied 

to the spigot fixings plates found on the top panel of the enclosure, a 

bead of silicone should be applied between the two mating faces to 

prevent leakage.
It is recommended that rigid ducting be used at all times. Flexible 

ducting has a very high resistance and it is impossible to calculate how 

much resistance will be on a system if used.
If used the flexible ducting must be kept to a minimum and should 

always be pulled taut. A maximum of 300mm should be used on each 

leg.
To prevent condensation on the outside of the outside air inlet duct and 

the air outlet duct from the unit, these ducts should be insulated.
Ducting must be installed in such a way that resistance to airflow is 

minimised. Bends should be kept to a minimum.
A minimum distance of 300mm between the appliance and any bends 

in ductwork is recommended.
Ideally 150mm diameter or 220 x 90mm rectangular ducting should be 

use (refer to dwelling design drawing, Figure 11 & Figure 12 on page 5 

for further information).
Ducting joints must be sealed with silicone type sealant and shall be 

adequately and reliably fixed to the appliance.

Содержание MRXBOXAB-ECO4-1Z

Страница 1: ... appropriate standards Ensure that the mains supply Voltage Frequency and Phase complies with the rating label Please note a clear working space is required around the installed unit to allow the cover to be removed and provide sufficient access for maintenance such as filter change A minimum of 480mm is required in front of the unit The fan must be installed indoors on a suitable structure away f...

Страница 2: ...of the enclosure can be removed and discarded the remaining screws securing the bracket to the MVHR unit can be loosened allowing the bracket to be removed before fully tightened to secure the panel in place 2 1 Mounting the MVHR Unit Due to the size and weight of the unit floor mounting is the preferred mounting method If this is not possible a solid wall is required however a structural engineer...

Страница 3: ...ation 6 l s Number of bedrooms in dwelling 1 2 3 4 5 Whole dwelling ventilation rate l s 1 2 13 17 21 25 29 1 The condensate must be discharged under a water level in a U trap drainpipe or an alternative drain method which acts as an airlock 2 The condensate discharge drain is a 32mm male threaded connection 3 If using a U trap please ensure the U trap has been filled to a suitable level of water ...

Страница 4: ...ons given in ADF 2010 can be used where security is not an issue In this case minimum high extract rate for the sanitary accommodation should be omitted from the step 2 calculation Step 3 The required airflow rates are as follows The maximum whole dwelling extract ventilation rate e g boost should be at least the greater of step 1 and step 2 Note that the maximum individual room extract rate shoul...

Страница 5: ...ms in ceilings via AirValve Insulated extract duct Insulated extract duct MVHR unit Nuaire MVHR DRAIN Condensate drain uninsulated drain pipe with min 5 o fall running to SVP MVHR unit Nuaire MVHR DRAIN Condensate drain uninsulated drain pipe with min 5 o fall running to SVP Exhaust air from kitchen bathroom to outside via air brick Minimum distance as specified in building regulations Intake air ...

Страница 6: ...ples Of Typical Wiring Layouts MAINS 230V 50Hz N L 3 Position Switch Ancillary code MRXBOX95 3SWITCH Blue Green yellow Brown Black Supply cord from unit Grey L 1 2 Fuse 5A MAINS 230V 50Hz N L 3 Pole Isolator 3 Position Switch Ancillary code MRXBOX95 3SWITCH Blue Green yellow Brown Black Supply cord from unit Grey L 1 2 Fuse 5A 2 Pole Isolator light Room Light switch Double Pole MAINS 230V 50Hz N L...

Страница 7: ...emoving front cover C C Ecosmart Connector Removable Plate 1 For required air flow rates please refer to the design specification for the property follow 2 4 or refer to building regulations ADF 2010 2 The unit should be run for a minimum of 10 minutes to reach steady state before commencing commissioning 3 The humidity sensor is initially set to its least sensitive position this should be adjuste...

Страница 8: ...as standard the supply fan will reduce to minimum speed Once the temperature rises above the set point the fan will return to its commissioned speed Please note this mode will only activate after ten days of continuous run time If commissioning of the unit is outside of this timeframe please notify the after sales department prior to site visit Nuaire recommend that filters are inspected every 6 m...

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