HIdRos SRH Series Tecnical Manual Download

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SRH

Swimming Pools Dehumidifiers

MTSRHGB

REV.072008

Controls during unit operation

•

Check the fans rotation. If the rotation is incorrect, disconnect the main switch and change over any two phases of the incoming

main supply to reverse motor rotation:

•

Check that the air speed through the evaporator ofthe unit should not exceed 1,5 / 2 m/s in order to guarantee a correct

dehumidification performance.

Refrigerant charge checking

•

After few hours the unit is working, check that sight glass shows a green colour core: if the core is yellow moisture would be
present in the circuit. In this case it is necessary circuit dehydration to be carried out by qualified people only. Check that

at the sight glass there is no continuous vapour bubbles presence. In this case additional refrigerant charge could be

required. It is however allowed the presence of few vapour bubbles.

•

Few minutes after the start up, working on summer operating mode (cooling), check that condensing temperature, is
approximately 15 °C higher than condenser inlet air temperature. Check moreover that evaporation temperature is bout 5

°C lower than the evaporator outlet temperature.

•

Check that refrigerant superheat on the evaporator is about 5-7 °C

•

Check if refrigerant sub-cooling on the condenser is about 5-7 °C.

Unit switch OFF

To stop the unit, the green led must be in OFF. Also the relative internal led will be switched off

WARNING: Never switch off the unit (for temporary stop), by opening the main switch: this component

should be used only to disconnect the unit from power supply when the current is not passing through,

i.e. when the unit is in OFF mode. Moreover, with no supply to crankcase heater, at the unit start up,
compressor could be seriously damaged.

MAINTENANCE AND PERIODIC CHECKS

It is a good rule to carry on periodic checks in order to verify the correct working of the unit:

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Check that safety and control devices work correctly as previously described (monthly).

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Check all the terminals on the electric board and on the compressor are properly fixed. Periodic cleaning of the sliding terminals
of the contactors should be done.

•

Verify refrigerant charge checking sight glass (monthly

•

Check there is no oil leakage from compressor (monthly

•

Check there is no water leakage in the hydraulic system (monthly).

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If the unit is to be expected to be stopped for a long period, unit hydraulic circuit should be emptied from all the tubes and heat

exchanger. This operation is compulsory if, during seasonal stop, ambient temperature is expected to go down below the
freezing point of employed mixture (typical seasonal operation).

•

Check crankcase heater proper supply and functioning (monthly).

•

Clean finned coils filters with compressed air in the opposite direction of the air flow (monthly)

•

Check the colour of the sight glass core (green=no moisture, yellow=moisture present): if it has a yellow colour, change the

refrigerant filter (every 4 months).