18/28
2015/12 - Indice de révision : B - Code : 33491
Operating principle
FAIRLAND console dehumidifiers are used to limit the relative humidity in an enclosed space containing a
pool or spa to a value selected by the user (between 30% and 99%). They should be installed inside the
room to be dehumidified.
This dehumidifier is designed to operate with an ambient temperature between 10°C and 38°C. Performance
data is not guaranteed outside this range.
If the dehumidifier is fitted with the heating option, it may be used to increase the room temperature to a
value selected by the user (between 18°C and 32°C). As soon as the room temperature drops below this
value, the heating system will be activated to raise the temperature to the set point. Should the temperature
spontaneously rise above the set point, heating will remain stopped.
This paragraph will help explain how a FAIRLAND dehumidifier works and provide a better understanding
of the importance of the provisions concerning installation, use and maintenance set out in this document.
•
A heat transfer fluid travels in a loop in a copper circuit, as it travels it experiences the following
cycle:
•
Step 1: warm, humid ambient air from the room to be dehumidified is drawn at a high flow rate over
a fin-type radiator in which cold fluid is circulating, this is the evaporator. Upon contact with the
evaporator, the air temperature falls until it reaches the condensation point of water vapour, which
causes the water to condense in fine droplets. At the same time, the heat transfer fluid recovers
the calories given up by the ambient air.
•
Step 2: the fluid enters the compressor where it experiences a high increase in pressure and an
increase in temperature.
•
Step 3: the cold, dehumidified air then passes over a second fin-type radiator located behind
the evaporator, the condenser, through which the hot heat transfer fluid from the compressor is
circulating, this heats the cold, dehumidified air before it is returned to the pool room.
•
Step 4: the heat transfer fluid passes into the expansion chamber where it is returned to its initial
temperature and pressure, before returning to step 1 to restart the cycle.
Thus, the compressor and the expansion chamber is composed of two half-loops:
•
the half-loop on the condenser side is called the HP (High Pressure) loop.
•
the half-loop on the evaporator side is called the LP (Low Pressure) loop.
Start up of the compressor is slaved to the dehumidification demand.
The user may choose to allow the fan to run continuously or for the fan to stop when there is no
dehumidification or heating demand (refer to setting of parameter C8 in paragraph VI.11). Running the fan
at low speed in the absence of a dehumidification or heating demand creates continuous movement that
homogenises the air in the room and allows more precise control of these two parameters.
