SHH Swimming pool dehumidifiers
MTSHHGB REV.072008
9
TECHNICAL DESCRIPTION
SHH dehumidifiers series are high-performances units especially designed for swimming pool applications or where humidity level
should be controlled or water vapour condensation should be prevented.
Frame
All SHH 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. The drip tray is present
standard in all SHH units and it’s in stainless steel. The colour of the units is RAL 7035
Refrigerant circuit
The refrigerant gas used in these units is R407C. The refrigerant circuit is made by using international primary brands components
and according to ISO 97/23 concerning welding procedures. The refrigerant circuit includes:
sight glass,
filter drier,
thermal expansion valve with external equalizer,
Schrader valves form maintenance and control,
pressure safety device (according to PED regulation)
Compressors
The compressor is scroll type with crankcase heater and thermal overload protection by a klixon embedded in the motor winding. It’s
mounted on rubber vibration dampers and, by request, it can be supplied with some jackets to reduce the noise (accessory). The
crankcase heater, when present, is always powered when the compressor is in stand-by. The inspection is possible through the
frontal panel of the unit.
Condensers and evaporators
Condensers and evaporators are made of copper pipes and aluminium fins. All evaporators are painted with epoxy powders to
prevent corrosion problem due to their use in aggressive environments. The diameter of the copper pipes is 3/8” and the thickness of
the aluminium fins is 0,1 mm. The tubes are mechanically expanded into the aluminium fins to 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 Stainless steel drip tray and all evaporators are supplied with a temperature
sensor used as automatic defrost probe.
Fans
The fan is centrifugal type. It’s statically and dynamically balanced and supplied complete of the safety fan guard according to EN
294. It’s mounted on the unit frame by interposition of rubber vibration dampers. The electric motor is at 4 poles (about 1500 rpm).
Connected to the fan by belts and pulleys and it’s equipped of an integrated thermal overload protection. The protection class of the
motors is IP 54.
Air Filter
It’s supplied standard with the unit. It’s made of filtering material in synthetic fibre without electrostatic charge. It can be removed for
differential disposal, class G3, according to EN 779:2002
Electric box
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 moisture protection
degree is IP44. In all SHH units are installed, standard, the compressors sequence relay who disables the operation of the
compressor in case the power supply phase sequence is not the correct one (scroll compressors in fact, can be damaged if they
rotate reverse wise). The following components are also standard installed: main switch, magnetic-thermal switches (as a protection
of the fans), compressors fuses, control circuit automatic breakers, compressor contactors. The terminal board is also supplied with
voltage free contacts for remote ON-OFF.
Microprocessors
All SHH units are supplied standard with microprocessor controls. The microprocessor controls the following functions: compressor
timing, automatic defrost cycles, the management of fresh and exhaust air, post heating valve and alarms. An appropriate LCD
display shows the operation mode of the unit, set point and alarms
