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Installation Manual
8.0 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.
8.1 Access
The main central panel allows access to controls and electrical
connections. Lower panels either side allows access to front face of
cooling coil, heat rejection coil or refrigerant high and low temperature
test points.
Access may not be possible if the minimum access zone of 920 x
300 mm has not been provided.
8.2 Annual Maintenance - Evaporator and Condenser
Inspect all heat exchangers 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 comb.
If the coil has become dirty, review the frequency of the filter
•
checks.
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.
While the mechanical cooling system is operating check the
•
system pressures, these should typically be:-
Suction pressure (low): 4.48 bar(65 psi) to 5.51bar(80psi)
Discharge pressure (high):16.54 bar(240psi) to 22.06 bar(320psi)
Check that all the panels are in place and that the unit is in a clean
•
condition.
8.3 Repair and Replacement
If, in the event of a failure, a component requires replacing, the
power to the unit must be securely isolated.
8.3.1 Refrigeration Circuit Components
** WARNING **
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.
** NOTE **
A refrigerant reclaim rig must always be available on site when
changing any refrigeration components, to remove all or part of
the refrigerant charge. The liquid line filter drier must be renewed
when a component is replaced.
All refrigerant in the unit must be reclaimed and disposed of safely.
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
8.3.2 Compressor
In the event of a compressor failure, a sample of oil should be removed
from the compressor by draining through the discharge port. This
sample should be tested, using a proprietary acid test kit, to determine
if the failure has resulted in a burn out. If the oil is clean, a new
compressor can be fitted immediately. In the event of a burn out the
system will need cleaning. In the absence of any approved flushing
agents, a burn out filter must be fitted in the suction line and an
oversized filter in the liquid line.
Ensure that the suction line filter is fitted with an appropriate acid
binding core.
Once the compressor has been replaced, the whole system must be
fully evacuated and the correct refrigerant charge measured in.
The suction line filter should be checked and the core replaced as
necessary until the system is clean, and then removed. The liquid line
filter should be replaced with one of the correct size when the system
is clear.
8.3.3 Pressure Switches
In the event of a pressure switch failure, it is not necessary to empty the
refrigeration circuit. Each pressure switch is connected to a Schrader
type self-sealing service valve, however, a small amount of liquid
refrigerant may escape when disconnecting the flare nut, and gloves
should be worn to protect the hands.
9.0 WARRANTY
The 1 year warranty starts from the day of delivery and includes parts
and labour.
This warranty is void if the equipment is modified without
authorisation, is incorrectly applied, misused, disassembled, or not
installed, commissioned and maintained in accordance with the details
contained in this manual and general good practice. Only genuine
Nuaire parts and filters may be used to maintain the unit. Failure to
maintain the unit as recommended will invalidate the warranty.
The product warranty applies to the UK mainland and in accordance
with Clause 14 of our Conditions of Sale. Customers purchasing from
outside of the UK should contact Nuaire International Sales office for
further details.
10.0 END-OF-LIFE AND RECYCLING
Where possible Nuaire use components which can be largely recycled
when the product reaches its end-of-life:
•Fans, motors, controls, actuators, cabling and other electrical
components can be segregated into WEEE recycling streams.
•Sheet metal parts, aluminium extrusion, heating/cooling coils and
other metallic items can be segregated and fully recycled.
•EPP, plastic ducting, nylon corner pieces, plastic heat exchangers,
packaging material and other plastic components can be
segregated into mixed plastic and widely recycled.
•Cardboard packaging, wood, used filters and other paper
components can be largely recycled or fully processed in energy
from waste centres.
•Remaining Items can be further segregated and processed in
accordance with the zero waste hierarchy. Please call After Sales
Support for further information on items not listed above.
Ensure that Nuaire product is made safe from any electrical / water
/ refrigerant supplies before dismantling commences. This work
should only be undertaken by a qualified person in accordance with
local authority regulations and guidelines, taking into account all
site based risks.
31. 08. 22. Document Number 671925
CM-XBOX-INLINE
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