LAB1199R, Issue 4, Apr 2017
Page 27
‘Fail (fan 1)’ displayed on the
controller LCD screen
•
Check the electrical connections for fan 1 on
the main PCB. There are four connections at
the top of the board for control and three at
the bottom of the board for power
•
By removing the exhaust duct connection,
check there is nothing obstructing fan 1
‘Fail (fan 2)’ displayed on the
controller LCD screen
•
Check the electrical connections for fan 2 on
the main PCB. There are four connections at
the top of the board for control and three at
the bottom of the board for power
•
By removing the supply duct connection,
check there is nothing obstructing fan 2
Little or no air is extracting or
supplying through the room
valves
•
Check that the filters have been removed from
the pre-commissioning protective covers
•
Check that the filters are not blocked
•
Check that the system has been
commissioned correctly
•
By removing the exhaust and supply duct
connections check there is nothing obstructing
the fans
The unit is excessively noisy
•
Check that the system has been
commissioned correctly
•
By removing the exhaust and supply duct
connections check there is nothing obstructing
the fans
7.2
If the fault/faults cannot be resolved using the table in section 7.1, contact the Domus
Ventilation Customer Service Team on 03443 715523.
LAB1199R, Issue 4, Apr 2017
Page 6
1.1 Overview
1.1.1 The
HRX-aQ
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 HRX-aQ appliance
•
Ventilation user-control centre
•
4m length of 4 core signal cable (to connect AQH 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:
•
204x60mm rectangular rigid duct system or,
•
Ø125mm rigid duct system or,
•
Radial duct system
•
Thermal duct insulation
V E N T I L A T I O N
V E N T I L A T I O N
LAB1306R, Issue 1, March 2018
Page 15
