Rev. F 02-2021
12
MTEC.6500.GB-F-1 Operation and maintenance manual SDA series English
SDA
6ZLPPLQJSRROGHKXPLGL¿HUV
3.1 Unit description
The
GHKXPLGL¿HUVDUHH[SUHVVO\GHVLJQHGIRUXVHLQVZLPPLQJSRROVZKHUHKXPLGLW\VKRXOGEHFORVHO\FRQWUROOHGLQRUGHUWRJXDUDQWHH
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 5 basic models which cover
a capacity range from 50 to 240 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.
5HIULJHUDQWFLUFXLW
The refrigerant gas used in these units is R410A. The refrigerant circuit is made by using international primary brands components and ac-
FRUGLQJWR,62FRQFHUQLQJZHOGLQJSURFHGXUHV7KHUHIULJHUDQWFLUFXLWLQFOXGHVVLJKWJODVV¿OWHUGULHUWKHUPDOH[SDQVLRQYDOYHZLWK
external equalizer, Schrader valves form maintenance and control, pressure safety device (according to PED regulation).
3.1.3 Compressors
The compressors are rotative 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 pos-
sible through the frontal panel of the unit that allows the maintenance of the compressor.
3.1.4 Condenser and evaporator
Condensers
DQGHYDSRUDWRUVDUHPDGHRIFRSSHUSLSHVDQGDOXPLQLXP¿QV
All evaporators are painted with epoxy powders to prevent corrosion problem due to their use in aggressive environments. The diameter of
WKHFRSSHUSLSHVLV´DQGWKHWKLFNQHVVRIWKHDOXPLQLXP¿QVLVPP7KHWXEHVDUHPHFKDQLFDOO\H[SDQGHGLQWRWKHDOXPLQLXP¿QVWR
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 centrifugal type, double inlet with forward curved blades. They are made of galvanized steel, painted with epoxy powders
(RAL7030) with 120 micros thickness, for an excellent protection in aggressive environments. All screws used are made in stainless steel
AISI 316. All fans are statically and dynamically balanced and supplied complete of the safety fan guard according to EN 294, they are
mounted on the unit frame by interposition of rubber vibration dampers to reduce the noise emission. The electric motors are directly con-
nected to the fans, they are supplied with 3 speeds with integrated thermal protection. Protection degree IP55.
$LUÀOWHU
It i
VPDGHRIV\QWKHWLF¿OWHULQJPHGLDXQGXODWHGW\SHZLWKRXWHOHFWURVWDWLFFKDUJHWKH\DUHDOOUHPRYDEOHIRUGLIIHUHQWLDOGLVSRVDO(I¿FLHQF\
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. TECHNICAL CHARACTERISTICS
