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Installation Manual
8.0 CONTROLS / DESCRIPTION OF OPERATION
MVHR will run continuously at Background/Whole dwelling duty
•
(Speed 1) unless it receives a 230v signal to Switched-Live input
connections SL1 or SL2.
Cooling module will be enabled to run and MVHR enabled to
•
speed 3 by a 230v Switched live from wall mounted thermostat
CM-THERM-CONTROL (supplied).
The wall mounted thermostat will control the cooling module
•
and MVHR unit. On reaching the set point (user defined) the
Cooling Module will operate and the MVHR will increase to speed
3. The wall mounted thermostat also features a ECO mode which
is pre-set to 23°C (not adjustable) and can be set to operate
between 1 and 24 hours by the user. Switching the wall mounted
thermostat (CM-THERM-CONTROL) off will disable the
cooling module.
It is recommended that, if possible, the cooling unit be interlocked
•
with the heating system to prevent triggering when heat is being
called for. Figure 8 shows connection to a heating system which is
normally closed via a link. This can be replaced by a suitable VOLT
FREE connection to the heating device.
Summer/Winter switch (Supplied with MVHR). Should be set to
•
summer mode when cooling is expected to run.
Summer mode can be selected year round to attempt to mitigate
•
overheating caused by solar gains but must be selected when
cooling is expected to run (summer months).
Winter mode ensures the MVHR will recover heat at all times.
•
For further details, see MRXBOXAB-ECO5-AE(OH)CV
•
installation manual (671861).
9.0 COMMISSIONING
To ensure the cooling module operates correctly and prevent
the thermal overload protection from tripping, there must be a
minimum airflow of 180 m
/h (50 l/s).
3
It is recommended the ventilation unit is set to speed 3 on supply
and extract, potentiometers are set to maximum (fully clockwise).
To commission the MVHR unit providing the air flow through the
cooling module, please refer to MRXBOXAB-ECO5-AE(OH)CV
installation manual (Document number 671861).
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
10.0 MAINTENANCE
Isolate before commencing work, make sure that the unit, switched
live and Nuaire control are electrically isolated from the mains
supply and switched live supply.
It is important that maintenance checks are recorded and that the
schedule is always adhered to. In all cases, the previous report should
be referred to.
10.1 Access
Access to both Coils for cleaning can be gained by removing the front
cover of the outer case and the inner covers of the Cooling Module.
Depending on the orientation of the unit (standard or opposite hand)
access will be given to one of the two coils. To access the second coil an
internal access panels must be removed.
The compressor requires no maintenance.
10.2 Annual Maintenance - Evaporator and Condenser Coils
Inspect all coils for signs of damage or dirt. Loose dirt may be
•
removed by using a soft brush, taking care not to brush the dirt
into the coil, blocking the fins. Damaged fins should be combed
out using a coil comb.
If the coil is excessively dirty check that MVHR filters are still in
•
place.
MVHR Filters are to be inspected every 6 months and replaced
•
every 12 months (or sooner if required).
If the coil is excessively dirty, use a proprietary cleaning agent, e.g.
•
HYDRO-COIL or MULTISOLVE.
Inspect the condensate drain tray and clean as required.
•
Check all electrical connections for tightness.
•
Switch on the power to the unit. Check the operation of the
•
mechanical cooling system.
Check that all the panels are in place and that the unit is in a clean
•
condition.
In the event the cooling module is not operating initially inspect
•
the MCB in the controls.
10.2.1 Refrigeration Circuit Components
All repair and replacement work on refrigeration components must
be carried out by a fully qualified refrigeration engineer, trained
in maintenance and refrigeration recovery, and with a sound
knowledge of all relevant safety regulations pertaining to the job.
All refrigerant in the unit must be reclaimed and disposed of safely.
10. 12. 21. Document Number 672010
MR-ECO-COOL-V
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