LAB1283R, Issue 2, Apr 2017
Page 6
1.1 Overview
1.1.1 The
Domus HRX2D
appliance is a key part of a whole house ventilation system
specifically designed to improve indoor air quality in dwellings. The system is designed to
provide measured amounts of filtered, fresh air to living areas while constantly removing
polluted, stale air from bathing, cooking and washing areas at the same gentle rate.
Any
available heat in the outgoing stale air is recovered by a built-in heat exchanger and used
to pre-warm the fresh supply air
1.1.2 A programmable user interface is provided to thereby maintaining a comfortable indoor
environment and includes the following features:
•
Time and date functions
•
Independent fan control adjustable at three levels; Low, Boost, Max
•
Programmable filter check reminder
•
Programmable 100% Thermal bypass
•
Optional 3 minute delay-on boost switching
•
Optional 5 to 30 minute delay-off boost switching
•
Optional programmable frost protection
•
Programmable humidity level boost switching
•
Temperature controlled switching available for optional duct heater (supplied
by others)
•
Elapsed runtime meter
1.1.3 The boost facility can also be triggered from a lighting circuit; contacts to accommodate
external sensors or switches are also available (see page 10)
1.1.4 The G3 filters in the appliance ensure that the fresh supply air is clean as it enters the
home. Additionally, the stale extract air is filtered to protect the heat exchanger from
unwanted contamination.
These filters have to be cleaned regularly
, depending on the
levels of pollution. The filters should be replaced when they start to show visible signs of
wear
1.1.5 This product is listed in the NCM PCDB, (was SAP Appendix Q) therefore, part of the
installation process requires that an installation checklist is completed and submitted to
the Building Control Body (BCB). Blank checklists are available at
http://www.ncm-
pcdb.org.uk/sap/filelibrary/pdf/Check_Lists/Domestic_Ventilation_Compliance_Guide_201
0_-_Checklist_(extract).pdf
1.1.6 Pack includes:
•
Domus HRX2D appliance
•
User control interface (Bluebrain controller)
•
4m length of 4 core signal cable (to connect HRX2D wiring centre and user-control)
•
Installation and operating instructions manual
•
Householders operating manual
•
ErP label and data fiche
1.1.7 Ancillary items as required:
•
Domus 220x90mm rectangular rigid duct system or,
•
Domus Ø150mm rigid duct system or,
•
Domus Radial duct system
•
Domus Thermal duct insulation
•
Domus 297 dry-trap and condensate drainage kit
LAB1283R, Issue 2, Apr 2017
Page 27
6.0
Maintenance
6.1 Routine maintenance
6.1.1 The two appliance G3 filters should be cleaned on a regular basis, the exact frequency will
be determined by individual living conditions.
6.1.2 The word ‘FILTER’ will appear on the home screen of the digital user-interface after the
set time has elapsed – when this occurs, clean the filters – see 5.1.4 for resetting details.
6.1.3 Before cleaning the filters, turn off the appliance at the isolator switch.
6.1.4 To remove the two filters, pull out the two caps from the front of the appliance and gently
slide out the filters in their carrier frames.
6.1.5 Lightly vacuum the filters to remove surface debris and then gently wash through in warm
soapy water. Ensure that the filters are completely dry before refitting.
Important:
do not
dry on a radiator or use excessive heat as this may distort the carrier frames.
7.0 Faults
7.1 Fault finding
Caution - the electrical supply to the unit and from any external triggers into the unit must
be isolated before removing covers to electrical connections.
Fault
Checks and possible solutions
Nothing displayed on the
controller LCD screen
•
Check there is power connected to the unit.
Presence of an orange light visible from
outside the white wiring centre box will
indicate this.
•
Check the electrical connections between
VCC (on controller) and 5V (on PCB)
•
Check the electrical connections between
GND (on controller) and GND (on PCB)
‘Unconnect’ displayed on the
controller LCD screen
•
Check the electrical connections between TD
(on controller) and RXD (on PCB)
•
Check the electrical connections between RX
(on controller) and TXD (on PCB)
‘Fail’ displayed on the
controller LCD screen
•
If relevant, check with the building
management services team if the external
inhibit function has been activated
•
If connected, check the smoke detector isn’t
activating the external inhibit function
•
If no external inhibit control is connected,
check there is a link wire present between the
two terminals of the external inhibit connection
on the main PCB
•
Check the electrical connections of the
aforementioned link wire between the two
terminals of the external inhibit on the main
PCB
V E N T I L A T I O N
V E N T I L A T I O N
