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12.5 - Tightening torques for the main bolts and
screws
screw type
Used for
Metal screw D=4.8
Condensing module, housing supports
Screw H M8
Condensing module, compressor fixing
Taptite screw M10
Condensing module, chassis - structure fixing,
control box fixings, compressor fixings,
oil separator fixing
Taptite screw M6
Piping support, cowling
Screw H M8
Piping clip
Screw H M6
Piping clip
Nut H M10
Compressor chassis
Nut H M10
Hydronic pump chassis
Screw H M8
Filter drier cover
Screw H M12
Economiser port flange
Screw H M16
Oil separator flanges, suction flanges
Screw H M16
Heat exchanger water boxes
Screw H M20
Suction flanges
Nut 5/8 ORFS
Oil line
Nut 3/8 ORFS
Oil line
12.6 - Condenser coil
We recommend, that finned coils are inspected regularly to
check the degree of fouling. This depends on the environ-
ment where the unit is installed, and will be worse in urban
and industrial installations and near trees that shed their
leaves.
For coil cleaning, two maintenance levels are used, based
on the AFNOR X60-010 standard:
level 1
•
If the condensers are fouled, clean them gently in a
vertical direction, using a brush.
•
Only work on condensers with the fans switched off.
•
For this type of operation switch off the HVAC unit if
service considerations allow this.
•
Clean condensers guarantee optimal operation of
your HVAC unit. This cleaning is necessary when the
condensers begin to become fouled. The frequency of
cleaning depends on the season and location of the
HVAC unit (ventilated, wooded, dusty area, etc.).
•
With MCHX condensers it is preferable to clean them
with a vacuum cleaner or a high-pressure cleaner
(maximum 68 bar and with 300 mm distance between
the diffuser and the coil).
level 2
The two cleaning products can be used for any of the follow-
ing coil finishes: Cu/Cu, Cu/Al, Cu/Al with Polual, Blygold
and/or Heresite protection.
Clean the coil, using appropriate products.
We recommend TOTALINE products for coil cleaning:
Part No. P902 DT 05EE: traditional cleaning method
Part No. P902 CL 05EE: cleaning and degreasing.
These products have a neutral pH value, do not contain
phosphates, are not harmful to the human body, and can be
disposed of through the public drainage system.
Depending on the degree of fouling both products can be
used diluted or undiluted.
For normal maintenance routines we recommend using 1 kg
of the concentrated product, diluted to 10%, to treat a coil
surface of 2 m
. This process can either be carried out using
2
Value
a high-pressure spray gun in the low-pressure position. With
(Nm)
pressurised cleaning methods care should be taken not to
4.2
damage the coil fins. The spraying of the coil must be done:
18
30
•
in the direction of the fins
•
in the opposite direction of the air flow direction
7
•
with a large diffuser (25-30°)
12
•
at a minimum distance of 300 mm from the coil.
10
30
30
It is not necessary to rinse the coil, as the products used
40
are pH neutral. To ensure that the coil is perfectly clean, we
40
110
recommend rinsing with a low water flow rate. The pH
190
value of the water used should be between 7 and 8.
190
65
26
WARNING: Never use pressurised water without a large
diffuser. Do not use high-pressure cleaners for Cu/Cu and
Cu/Al coils! High pressure cleaners are only permitted
for MCHX coils (maximum permitted pressure 68 bar)
Concentrated and/or rotating water jets are strictly for-
bidden.
Never use a fluid with a temperature above 45°C to clean
the air heat exchangers.
Correct and frequent cleaning (approximately every three
months) will prevent 2/3 of the corrosion problems.
Protect the control box during cleaning operations.
12.7 - Evaporator maintenance
Check that:
•
the insulating foam is intact and securely in place.
•
the cooler heaters are operating, secure and correctly
positioned.
•
the water-side connections are clean and show no sign
of leakage.
43
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