HIdRos SRH Series, Tecnical Manual

SRH 

Swimming Pools Dehumidifiers

MTSRHGB  

9 

REV.072008

TECHNICAL CHARACTERISTICS 

SRH dehumidifiers series are highly performances units designed for swimming pool applications where it is necessary to control 
humidity and to prevent condensation to guarantee optimal comfort.  

Frame 

All SRH 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 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. All units are supplied with two circuits, each refrigerant circuit is totally 

independent from the other. Any incorrect operation of one circuit does not influence the other circuit. The refrigerant circuit includes: 

SRH

liquid line manual shut-off valve, sight glass, filter drier, thermal expansion valve with external equalizer, Schrader valves 

form maintenance and control, pressure safety device (according to PED regulation). 

SRH/WZ 

 these versions are supplied with one refrigerant circuit identical to the SRH version, the second circuit includes: one way 

valves, solenoid valves, liquid receiver, water heat recovery, liquid line shut-off valve, sight glass, filter drier, thermal expansion valve 
with externalequalizer, Schrader valves formaintenance andcontrol,pressuresafety device. 

Compressors 

The compressors are scroll type with crankase heater and thermal overload protection by a klixon embedded in the motor winding. 
The compressors are mounted on rubber vibration dampers and they can be supplied wih sound attenuation jacket to reduce the 

noise emission (option). The compressor crankcase heater is always powered when the unit is in stand-by. The inspection on the 

compressors is possible only through the unit front panel. 

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. 

Heat recovery 

It is supplied on the SRH/WZ, factory mounted, it is composed by a plate heat exchanger in molibdenum alloy, suitable for operation 

with chlorine water; the heat recovery is designed to reject on water about 50% of the total thermal load generated by the unit. When 

the heat recovery is activated, the supply air temperature of the unit is, basically, the same of the return air. 
 

Fans 

The fans are made of galvanized steel, centrifugal type, double inlet with forward curved blades. They 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. The electric motors are 4 poles (about 1500 rpm), three-phase power supply. The motors are connected to 

the fans by pulleys and belts. The protection class of the motors is IP 54. 

Air Filter 

Supplied as standard with the unit, it is made of G3 class sysnthetic fibre filtering media (efficiency 85% by weight), 48 mm 

thickness. 

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 moisture protection 

degree is IP55. In all SRH 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 
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.