Rev. H 11-2021
12
MTEC.6800.GB-H-1 Operation and maintenance manual SMA series English
SMA
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3.1 Unit description
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optimal comfort. These units are intended to be installed in a technical room close to the swimming pool. A centrifugal fan with high available
static pressure allows unit connection to ductworks, both for air suction and discharge. This series comprises 6 basic models which cover
a capacity range from 263 to 940 l/24h.
3.1.1 Frame
All units are made from hot-galvanised thick sheet metal, painted with polyurethane powder enamel at 180°C to ensure the best resistance
against the atmospheric agents. The frame is self-supporting with removable panels. All screws and rivets are in stainless steel. The colour
of the units is RAL 9018.
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The refrigerant gas used in these units is R410A. The refrigerant circuit is made by using international primary brands components and ac-
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external equalizer, Schrader valves form maintenance and control, pressure safety device (according to PED regulation).
3.1.3 Compressors
The compressors are Scroll type, with thermal overload protection by a klixon embedded in the motor winding. The compressor is mounted
on rubber vibration dampers and it is supplied,standard, with sound-proof cover to reduce noise emission. The inspection is possible
through the frontal panel of the unit that allows the maintenance of the compressor.
3.1.4 Condenser and evaporator
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All evaporators are painted with epoxy powders to prevent corrosion problem due to their use in aggressive environments. The diameter of
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improve the heat exchange factor. The geometry of these heat exchangers guarantees a low air side pressure drop and then the use of low
rotation (and low noise emission) fans. All units are supplied, standard, with a powder coated steel drip tray and all evaporators are supplied
with a temperature sensor used as automatic defrost probe.
3.1.5 Supply fan
The fans are made of galvanized steel, centrifugal type. It is statically and dynamically balanced and supplied. The electric motors are
directly connected to the fan; they are all at 3 speeds, with integrated therma protection. The protection class of the motors is IP 54.
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class G5, according to EN 779:2002.
3.1.7 Microprocessors
All units are supplied standard with microprocessor controls. The microprocessor controls the following functions: regulation of the water
temperature, antifreeze protection, compressor timing, compressor automatic starting sequence, alarm reset, potential free contact for
remote general alarm, alarms and operation leds.
3.1.8 Electric enclosure
The electric switch board is made according to electromagnetic compatibility norms CEE 73/23 and 89/336. The accessibility to the board is
possible after removing the front panel of the unit and the OFF positioning of the main switch. The following components are also standard
installed: main switch, magnetic-thermal switches (as a protection fans and compressors), control circuit automatic breakers, compressor
contactors, fan contactors. The terminal board is supplied with voltage free contacts for remote ON-OFF and general alarm.
3.1.9 Control and protection devices
All units are supplied with the following control and protection devices: antifreeze protection sensor, high pressure switch with manual
reset, low pressure switch with automatic reset, high pressure safety valve, compressor thermal overload protection, fans thermal overload
protection.
3.1.10 Test
All the units are fully assembled and wired at the factory, carefully evacuated and dried after leak tests under pressure and then charged
with refrigerant R410A. They are all fully operational tested before shipment. They all conforms to European Directives and are individually
marked with the CE label and provided with Conformity Declaration.
3. TECHNICAL CHARACTERISTICS