NuAire MRXBOX95B-LPIH Installation And Maintenance Manual Download

Page: 4 / 13

24. 06. 13. Leaflet Number 671607

Installation and Maintenance

MRXBOX95B-LP1H Mechanical Ventilation with Heat Recovery, Summer Bypass & Integral Humidistat

4.0 Ducting arrangements

Figure 6. Typical ducted arrangement for a void mounted unit using using rectangular 204 x 60mm ducting and ceiling air valves.

Supply air to
lounge via
Air Valve
(Part no. V125S)
in ceilings.

Extract air from
kitchen via
Air Valve
(Part no. V125S)
in ceilings.

Supply air to
bedrooms via
Air Valve
(Part no. V125S)
in ceilings.

MVHR-DRAIN
condensate drain,
running to SVP.

Nuaire
MRXBOX95B-LP1H
ceiling void
mounted unit.

Extract air from
bathroom via
Air Valve
(Part no. V125S)
in ceilings.

Exhaust air from
kitchen/bathroom to
outside via air brick
(Part no. PVC505NS).

Supply and extract
ducts from external
air bricks to the unit
needs to be insulated.

Minimum
300mm

Top of ceiling void.

Intake air from
outside via air brick
(Part no. PVC505NS).

3.0 Dimensions (mm)

Figure 5. Also shows the working space required.

View from top with lid (A)

700

View from control side

668 hole centr

900

885 hole centres

850

153

End view

200

(B)

(A)

View from underside with lid removed (B)

600

Work space

Spigot 2.
Supply
Air

Spigot 3.
Extract
Air

Spigot 4.
Exhaust
Air

Spigot 1.
Intake
Air

250

Heat
exchanger

Bypass
chamber

Supply
fan

Extract
fan

21.5mm condensate pipe

Drip tray

Wire
frame
filter

Bypass
damper

735 (Filter access distance)

Removable
filter
access

96.4

342

Summary of Contents for MRXBOX95B-LPIH

Page 1: ... To recover heat from the extract air the heat exchanger block is utilised The heat exchanger can recover up to 80 of the normally wasted heat The bypass damper opens automatically via a wax actuator when the outside air reaches 20 C when the outer air temperature returns below this level the unit returns to its original state Outside air supplied through the bypass is still being filtered so the ...

Page 2: ...ustable valve types not supplied External grilles to have a minimum free area of 12 250 sq mm 2 3 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 It is recommended that rigid ducting must be used ...

Page 3: ...nd it has been assumed that the provisions for purge ventilation e g openable windows could be used Step 1 For any design air permeability determine the whole dwelling ventilation supply rate from Table 2 As an alternative where the design air permeability is intended to be leakier than 5m3 h m2 50 Pa allow for infiltration for all dwelling types by subtracting from the whole dwelling ventilation ...

Page 4: ...t no V125S in ceilings Exhaust air from kitchen bathroom to outside via air brick Part no PVC505NS Supply and extract ducts from external air bricks to the unit needs to be insulated Minimum 300mm Top of ceiling void Intake air from outside via air brick Part no PVC505NS 3 0 Dimensions mm Figure 5 Also shows the working space required View from top with lid A 700 View from control side 668 hole ce...

Page 5: ...itch Grey Grey Green yellow Unit serving kitchen and bathroom Unit serving kitchen and two bathrooms Figure 8 Figure 9 For good EMC engineering practice any sensor cables or switched live cables should not be placed within 50mm of other cables or on the same metal cable tray as other cables Figure 7 5 0 Electrical Connection Please note the electrical connection of the unit must be be carried out ...

Page 6: ...an to maximum airflow See wiring diagram for details of operating this facility 6 2 Humidity adjustment This product contains an internal humidity sensor fitted into the airflow extracting from the wet rooms When the unit senses that the humidity exceeds the set point the unit will boost to that set by the commissioned boost speed The set point can be found on the bottom of the unit see fig 10 and...

Page 7: ...the impeller being affected 3 2 When handling the equipment care should be taken with corners and edges and that the weight distribution within the unit is considered Lifting gear such as slings or ropes must be arranged so as not to bear on the casing 3 3 Equipment stored on site prior to installation should be protected from the weather and steps taken to prevent ingress of contaminants 4 0 OPER...

Page 8: ...lings assessed under The Building Regulations 2010 specifically SAP 2009 and Approved Documents L and F Completion of this document is therefore only required for dwellings assessed by SAP 2005 Customer Details Customer Name Address Telephone Number Date of Installation Name of Lead Contractor Design Project Number It should be noted that this guidance is not intended to replace product manufactur...

Page 9: ...or to overcome particular obstructions If flexible ducting has been used has it been pulled taut to minimise system resistance Has the number of duct bends been minimised to ensure adequate air flow and least resistance Bends should have a minimum radius at least the same as the diameter of the ducting used Refer to Figure 1 if using flexible ducting Have the fans and ducting placed in unheated vo...

Page 10: ...ry unit been fixed to a stable element of the building fabric e g wall or floor using manufacturer recommended supplied fixing brackets Has the condensation drain been fitted and the pipe insulated Have approved acoustic anti vibration mountings been used Note Special attention is needed to avoid transmission and stress to duct joints Has the unit been installed in a position that will permit acce...

Page 11: ... or N A Has the rating label been verified to establish suitability for the installation strategy and whether an earth is required e g voltage class I or II product status Has a local isolator been provided to enable the unit to be isolated for maintenance purposes Has the unit been fused in accordance with its power rating SECTION 2 COMMISSIONING GUIDANCE ...

Page 12: ...ution grilles been locked where possible to minimise unapproved occupant adjustment Figure 3 Ensure all external and internal windows and doors are closed Set fan speed using manufacturer data table Set normal daytime air flow on extract points starting at location furthest from unit Set normal daytime air flow on input points starting at location furthest from unit Step 1 Step 2 Step 3 Step 4 Ste...

Page 13: ...he customer been advised that opening windows is not recommended during normal use in order to ensure the energy efficient operation and performance of the balanced system Has the customer been advised not to seal natural air flows from room to room e g avoid door seals and thick pile carpets Has the customer been advised not to alter settings post commissioning Has the customer been advised to cl...

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