EVCO EVFTFT618N7U - Manual (Page 34)

EVCO S.p.A. EVFTFT618 | Installer manual ver. 2.2 | Code 144FTFT618E224
Page 34 of 62
10.8 Dehumidification management
Dehumidification management is only active when the humidity management takes place via the use of the humidity
transducer (rU0 = 0).
The dehumidification can be managed in two different ways: via an extractor fan (parameter u3 = 0, utility associated to
output K4) or via the activation of the cooling plant (compressor and pump-down electrovalve if present).
10.8.1 Management via extractor fan/dehumidifier
In the case of management via extractor fan/dehumidifier, the output will activate when the humidity has exceeded the
dehumidification neutral area, (rU6) of the value of the differential value (rU5) and deactivates when the humidity has
returned within the dehumidification neutral area value.
10.8.2 Management via cooling plant activation
The compressor will behave in the same way whenever the management of the pump-down electrovalve is enabled.
If, instead, pump-down electrovalve management is enabled, there will first be a dehumidification attempt via activation
of the electrovalve (rU7, to try and make use of the high pressure generated during pump-down in compressor switch-off
mode), on the expiry of which, the compressor output will be activated.
Once the humidity returns within the dehumidification neutral area value, the pump-down electrovalve will be deactivated.
After which, the compressor will deactivate via the pump-down algorithm.
10.9 Management of the condenser fan
If parameter u3 has value 1, output K4 will assume condenser fan control function.
If the condenser probe is active (parameter P4 = 1), the condenser fan will activate when the condenser temperature is
over the value of parameter F16 of the differential value (F16 + 2.0 °C / 4 °F), independently from the status of the
compressor, while it will always be on with the compressor on.
The condenser fan will switch-off when the condenser temperature drops below the value of parameter F16.
With condenser probe disabled (parameter P4 = 0) the condenser fan will be activated in parallel to the compressor, while
deactivation will be delayed by the time established with parameter F17.
The condenser fan is always on during an overheated condenser alarm (label COH) or compressor blocked (label CSd)
alarm.
The fans are handled during the hot gas defrost.
10.10 Cabinet light management
Cabinet light switch-on is enabled/disabled by opening/closing the door.
Light on with door open, light off with door closed.