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4- COMMISSIONING
CWS Basic 121-161-201-251
4.4 Fan coil
Check that each fan coil is correctly fed with chilled water, measuring the inlet and out-
let temperatures. The difference between the two temperatures should be between 5°
C and 10° C. If the differential is higher, it normally means that there is still air in the
circuit and the circulation in that fan coil is poor.
In case of particularly long circuit, it might be necessary to adjust the fan coil flow clo-
sing the calibrating valves of the fan coils nearer to the manifold in order to let more
water to reach the ones, which are more distant.
Check that the thermostat sensor is correctly positioned in the air intake of each fan
coil. If the temperature control is "Fan only", the thermostat stops the fan when the
ambient temperature reaches the set point.
IMPORTANT: With the "Fan only" control, the thermostat sensor must be installed on
the air intake but not on the fan coil.
If the fan coil control is "Water valve" then the thermostat closes the special water
valve connected to the fan coil while the fan keeps running. In this case the thermo-
stat sensor must be installed on the fan coil fastened to the special thermostat bulb
holder.
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