RHOSS MVT Mode D'emploi page 16

EN
beginning of the season when the machine will be used and
generally every month.
With the unit switched off, remove the machine casing and
check the condition of the exchanger and condensate drain. If
necessary:
•
air passage;
• remove the deposited dust using compressed air;
• gently wash with water and brush slightly;
• dry using compressed air;
• keep the condensate drain free from any obstructions that
Remove the machine casing;
1.
start the system for a few minutes;
2.
stop the system;
3.
loosen the vent screw on the inlet collector and bleed it;
4.
Repeat the operation several times until air is no longer
5.
released from the system.
End of season
It is advisable to drain the water from the system at the end of
the season in order to prevent breakage due to freezing.
The following operations are recommended to perform mainte-
nance on the electrical circuit:
• check the unit power consumption using a clip-on meter and
compare the reading with the values shown in the documen-
tation;
• inspect and check that the electrical contacts and relative ter-
minals are tightened correctly.
If the electric motor of the fan malfunctions, the entire fan unit
must be replaced.
• Remove the casing;
• Disconnect the electric
fan connection cable;
• Remove the screws that
secure the fan to the unit
structure on both sides;
• Remove the fan.
• Follow the instructions in the reverse order to re-mount the fan.
Section II :: Installation and maintenance
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16
• Remove the casing;
•
return;
• Disconnect the battery
from the system;
• Remove the screws that
secure the battery to the
unit structure on both si-
des;
• Remove the exchanger.
• Follow the instructions in the reverse order to re-mount the
exchanger.
SAFEGUARD THE ENVIRONMENT
RHOSS has always cared about protecting the environment.
When the unit is dismantled it is important to adhere scrupulously to
the following procedures.
disposal of scrap machinery/products.
The unit as a whole is composed of materials considered as
secondary raw materials and the following conditions must be
complied with:
• If the appliance contains antifreeze, this should not just be di-
sposed of freely, as it causes pollution.
• It must be collected and disposed of properly;
• The electronic components (electrolytic condensers) are consi-
dered special waste, and must be delivered to a body authori-
sed to collect such items;
• The pipe insulation made of polyurethane foam, polyethylene
foam mesh and the sound-absorbing sponge that lines the pa-
nelling must be removed and processed as urban waste.
• No NH4+ ammonium ions in the water, they are very detrimental for
copper. This is one of the most important factors for the operating life
of copper piping. A content of several tenths of mg/l will badly corrode
the copper over time.
• Cl- Chloride ions are detrimental for copper with a risk of perforations by
corrosion by puncture. If possible keep below 10 mg/l.
• SO4 2- sulphate ions can cause perforating corrosion, if their content
is above 30 mg/l.
•
• No Fe2+ and Fe3+ ions with non negligible levels of dissolved oxygen
mg/l.
• Dissolved silicon: silicon is an acid element of water and can also lead
• Water hardness: > 0.5 mmol/l. Values between 1 and 2.5 can be re-
commended. This will facilitate scale deposit that can limit corrosion of
copper. Values that are too high can cause piping blockage over time.
A total alkalimetric titre (TAC) below 100 is desirable.
• Dissolved oxygen: Any sudden change in water oxygenation condi-
tions must be avoided. It is as detrimental to deoxygenate the water
by mixing it with inert gas as it is to over-oxygenate it by mixing it with
pure oxygen. The disturbance of the oxygenation conditions encoura-
ges destabilisation of copper hydroxides and enlargement of particles.
•
stance, the slower the corrosion tendency.
• Values above 30 Ohm·m are desirable. A neutral environment favours
the order of 20-60 mS/m can be recommended.
•
If the water circuit must be emptied for longer than one month, the com-
plete circuit must be placed under nitrogen charge to avoid any risk of
corrosion by differential aeration.
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