Tightening Torques For The Main Bolts And Screws; Condenser Coil; Evaporator Maintenance - Carrier Aquaforce 30XAS Series Installation, Operation And Maintenance Instructions

11 - STANDARD MAINTENANCE
11.5 - Tightening torques for the main bolts and
screws
Screw type Used for
Metal screw D = 4.8 Condensing module, housing supports
Metal screw D = 6.3 Plastic Volute, grill
Condensing module, chassis - structure
Taptite screw M10 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 Hydraulic 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
Nut H M12/M16 Victaulic collars on suction piping

11.6 - 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:
Recommendations for maintenance and cleaning of round tube
plate fin (RTPF) condenser coils:
- Regular cleaning of the coil surface is essential for correct
unit operation. Eliminating contamination and removal of
harmful residue will increase the operating life of the coils
and the unit.
- The maintenance and cleaning procedures below are part of
the regular maintenance and will prolong the life of the coils.
Removal of fibres that obstruct the surfaces:
Fibres and dirt collected on the coil surface must be removed with
a vacuum cleaner. If you do not have a vacuum cleaner, a soft
Value
brush with non-metallic bristles can be used instead. In all cases
(N·m)
cleaning must be done in the direction of the fins, as the coil surface
4,2
is easily damaged. The fins bend easily and damage the protective
4,2
coating of the coil, if cleaning is done at right angles to the fins.
NOTE: Using a water jet from a spray hose on a polluted
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surface will result in fibres and dirt becoming trapped in the
coil, making cleaning more difficult. All fibres and dirt must
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be removed from the surface, before using a low-speed
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rinsing jet.
10
Periodical cleaning with clean water:
30
For coils installed in a coastal or industrial environment
30
periodical cleaning by rinsing with water is beneficial. It is
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however essential that rinsing is done with a low-speed water
40
jet to avoid damaging the fins. Monthly cleaning as described
110
below is recommended.
190
ATTENTION
190 - Chemical cleaning agents, water containing bleach,
acidic or basic cleaning agents must never be used to
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clean the coil exterior or interior. These cleaning agents
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may be difficult to rinse off and can accelerate corrosion
60/130
at the joint between tube and fins, where two different
materials come into contact.
- High-speed water from a high-pressure cleaner, spray
hose or compressed air cleaner must never be used for
coil cleaning. The force of the water or air jet will bend
the fins and increase the air-side pressure drop. This
can result in reduced performance or nuisance
shutdowns of the unit.
Recommendations for maintenance and cleaning of MCHE
(microchannel) condenser coils:
- Regular cleaning of the coil surface is essential for correct
unit operation. Eliminating contamination and removal of
harmful residue will increase the operating life of the coils
and the unit.
- The maintenance and cleaning procedures below are part of
the regular maintenance and will prolong the life of the coils.
- Remove foreign objects and debris attached to the coil
surface or wedged between the chassis and the supports.
- Provide personal protection equipment including safety
glasses and/or a face mask, waterproof clothing and safety
gloves. It is recommended to wear clothing that covers the
whole body.
IMPORTANT:
- 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 MCHE coils
(maximum permitted pressure 68 bar)
- Concentrated and/or rotating water jets are strictly
forbidden.
- 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.
- Clean and brush with a soft a soft Nylon, PolyPro
Tynex brush all the connection to remove any loose
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corrosion and debris with tap water at low pressure.

11.7 - 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.
or
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