AERMEC URX CF, Selection And Installation Manual

Page: 27 / 36

Heat recovery units with refrigeration circuit -
URX_CF
-
27
Selection and installation manual
GB
Maintenance of the unit
CAUTION!
During the maintenance phase, wear
proper individual protection devices
(IPD)
• Before performing maintenance
and/or cleaning operations on
the unit, make sure the unit is
disconnected from the power supply
and that it can not be turned back
on without the knowledge of the
person performing maintenance, and
that the heat exchanger coils are not
working.
• During maintenance the weight
of the inspection panelling could
hinder the work
The URX_CF series recovery units
have been designed to require
very little maintenance and to make
every operation easy. Some simple
pieces of advice follow for the proper
maintenance of the unit.
Filters
Filter cleaning is imperative to
maintain high air quality in the room.
The synthetic filters installed in the
URX_CF unit can be regenerated with
compressed air or can be washed with
cold water. To disassemble the filters:
• remove the inspection panel with
knobs;
• remove the filters;
• clean the filters;
• replace all parts in reverse order.
Condensate
drain pan
Dirt can hoard up in the condensate
d r a i n p a n . Yo u a r e t h e r e f o r e
recommended to clean the pan
regularly and check that the discharge
pipe is not clogged.
To remove the condensate drain pan of
the heat recovery unit:
• remove all bottom panels;
• disassemble the cross bar;
• disconnect the pan from the
condensate drain pipes;
• disassemble the pan supporting
brackets;
• clean the pan;
• replace all parts in reverse order.
In order to access the condensate drain
pan on the coil module, detach the
module from the unit and disassemble it.
Heat recovery
The heat recovery unit can be cleaned
with a jet of compressed air or cold
water. To disassemble the heat recovery
unit:
• remove the condensate drain pan;
• remove the heat recovery unit
supporting brackets;
• clean the heat recovery unit;
• replace all parts in reverse order.
Motor ventilating assembly
The motor ventilating assembly needs to
be checked to see how clean the rotor
is, whether there is corrosion or damage,
and whether there are abnormal noises.
If necessary disassemble the motor fan
assembly as follows:
• remove all inspection panels;
• disconnect the power supply cable;
• unscrew the four screws that hold each
of the motor fan assemblies to the frame;
• check the motor fan assemblies and
replace them if necessary;
• replace all parts in reverse order.
REFRIGERANT LOAD
SIZES URX_CF 07 10 15 21 33
kg Consult AERMEC Technical Departiment
Checks during
operation
The air flow rate values must not be
lower than 15% of the nominal values
indicated in the technical specifications
table.
If an electrical resistance is present,
check the cut-in by measuring its
electrical absorption.
Requirements of gas
R410A
The circuit chillers that work on R410a
cooling gas require particular attention
during assembly and maintenance, to prevent
operating faults.
Therefore it is necessary to:
- Avoid refilling with oil different from
the one specified and already used in
the compressor.
- If there are gas leaks causing the unit
to be even partially empty, do not
refill with refrigerant, but empty the
unit completely and refill it with the
foreseen amount.
- In the event of replacement of one of
the refrigerating circuit parts, do not
leave the circuit open for more than
15 minutes.
- In particular, in the event of
replacing the compressor, complete
the installation within the above-
mentioned time after the rubber plugs
have been removed.
- When empty, do not switch on the
compressor; do not compress the air
within the compressor.