AERMEC WRL-H 500 Installation & Maintenance Manual - Page 13
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8.
EXTRAORDINARY
MAINTENANCE
The WRL heat pumps are loaded with R410A gas
and factory inspected. Under normal conditions
they do not require Technical Assistance related to
control of refrigerant gas. Through time gas leakage
may be generated from the from the joints, causing
refrigerant to escape and discharge the circuit,
causing appliance malfunctioning. In these cases the
leakage points are to be discovered, repaired and
the Gas circuit is to be replenished, respecting the
December 28 1993 n°549 law.
8.4.1.
LOAD PROCEDURE
The load procedure is the following:
Empty and dry the entire cooling circuit
•
using a vacuum pump connected to the
low and high pressure socket until 10 Pa
is read on the vacuum meter. Wait a few
minutes and check that this value does not
rise above 50 Pa.
•
Connect the refrigerant gas cylinder or
a load cylinder to the socket on the low
pressure line.
•
Load the amount of refrigerant gas
indicated on the appliance features plate.
9.
ROUTINE
MAINTENANCE
All cleaning is prohibited until the unit has been
disconnected from the electric power supply mains.
Make sure there is no voltage present before
operating.
Periodic maintenance is fundamental to keep the
unit perfectly efficient under a functional and
energetic point of view.
It is therefore essential to carry out periodic yearly
controls for the:
9.4.1.
HYDRAULIC CIRCUIT
CHECK:
Refilling of water circuit
•
Cleaning the water filter
•
Control of flow switch
•
•
No air from the circuit (bleed)
That the water flow rate to the evaporator is
•
constant
The thermal insulation of the hydraulic piping
•
•
The percentage of glycol where necessary
Please provide, in the periodical operations of
•
ordinary maintenance, also the control and the
tightening of hydraulic connections.
9.4.2.
ELECTRICAL CIRCUIT
CHECK:
Safety efficiency
•
•
Electric supply pressure
IWRLI2_13.04_5890700_00
After a few hours of functioning, check that
•
the liquid indicator indicates the dry circuit
(dry-green). In the case of partial loss, the
circuit must be emptied completely before
being re-loaded.
•
The R410A refrigerant must only be loaded
in the liquid state.
Functioning conditions that are different
•
to the nominal conditions can give rise to
values that are greatly different.
•
The sealing test or the search for leaks must
only be performed using R410A refrigerant
gas, checking using a suitable leak detector.
•
In the cooling circuit it is prohibited to use
oxygen or acetylene or other inflammable
or poisonous gases because they are a
cause of explosions or intoxication.
•
Electrical Input
Connection tightness
•
Functioning of the compressor guard resistance
•
9.4.3.
COOLING CIRCUIT
CHECK:
•
State of compressor
Efficiency of the plate heat exchanger
•
resistance
•
Work pressure
Leak test for watertightness control of the
•
cooling circuit
Functioning of high and low pressure pressure
•
switches
Carry out the appropriate checks on the filter
•
dryer to check efficiency
9.4.4.
MECHANICAL CHECKS
CHECK:
The tightening of the screws the compressors
•
and the electrical box, as well as the exterior
panelling of the unit. Insufficient fastening can
lead to undesired noise and vibrations.
The condition of the structure.
•
If there are any oxidised parts, treat with paint
suitable to eliminate or reduce oxidation.
WARNING
Inspection, maintenance and
eventual repair work must be
carried out only by a legally
qualified technician.
Lack of control/maintenance can
cause damage to persons or things.
For appliances installed near to
the sea, the maintenance intervals
must be halved.
We recommend to envision a
machine book (not supplied,
but the user's responsibility),
which allows to keep track of
the interventions performed
on the unit. In this way it will
be easy to suitably organise the
interventions making research and
the prevention of any machine
breakdowns easier.
Use the date to record date, type
of intervention made (routine
maintenance, inspection or
repairs), description of the
intervention, measures actuated...
IT IS forbidden to RELOAD the
circuit with a refrigerant gas
different to the one indicated.
Using a different refrigerant gas
can cause serious damage to the
compressor.
DISPOSAL
Envisions that disposal of the
unit is carried out in conformity
with the Standards in force in the
different countries.
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