EVCO EVFTFT618N7U - Manual (Page 32)

EVCO S.p.A. EVFTFT618 | Installer manual ver. 2.2 | Code 144FTFT618E224
Page 32 of 62
With pump-down managed from LP digital input (parameter u1 = 0 and i6 = 2):
On activation of the compressor in parallel, the pump-down electrovalve will also be activated.
Compressor deactivation will be advanced by the deactivation of the pump-down electrovalve; the compressor will be
switched off successively via the intervention of the LP digital input.
Whenever the LP digital input does not intervene within maximum time U2, the compressor will be deactivated and the PD
alarm activated; an alarm turns off the high-pressure compressor regardless of the management of the pump-down.
If the pump-down is managed by the LP digital input, at every compressor output and electrovalve switch-on, a LP digital
input rearm time will be loaded (parameter i9). When the compressor is off, the status of the LP digital input will not be
considered.
10.3 Management of the evaporator fan
The evaporator fan is managed via the PWM analogue output and the phase cut module EVDFAN1 or via the digital output
K8 in On/Off mode if the parameter u1 = 1.
The evaporator fan can be configured for every phase of the cycle to operate continuously or in parallel to the adjustment
output, i.e. in parallel with the compressor, heating element, humidification and dehumidification. The definition of the
behaviour is given by the parameters from F0 to F4.
It will also be possible to establish a delay time for deactivation of the fan with respect to the adjustment output through
parameter F13 and a duty-cycle with a cycle time and an On time given by parameters F14 and F 15 during deactivation
of the main utility. If parameters F14 and F15 are at zero, there will be no activation.
In the event of evaporator fan management via PWM analogue output, it will also be possible to establish the speed of the
fan itself for every phase.
O fan switch-on the controller manages a speed (F21) and a peak time (F22) of the same. On conclusion of the ramp-up
phase, the fan will modulate according to the speed set for the phase in progress, compensated via parameters F23 and
F24, which respectively establish the minimum and maximum speed of the fan itself.
The fan is OFF during defrosting cycle. At the end of a defrosting cycle the evaporator fan will remain at a standstill for the
dripping time given by parameter d7 and for the successive evaporator fans standstill time given by parameter F12.
Evaporator fan calibration procedure managed via TDF module:
To adapt the TDF adjustment to all types of single-phase 230 Vac motors, it is recommended to perform manually
calibrate the evaporator fan.
1. Set F23 at 0% and F24 at 100%
2. Carry out a manual cycle and varying the fan speed, check the minimum percentage below which the fan
switches off and the maximum percentage above which the fan goes to maximum.
3. Set these values respectively for F23 and F24.
10.4 Defrosting management
Defrosting is active during the automatic LOCK and STORAGE phases and during the MANUAL COOLING phase and can be
automatic (at time intervals) or manual. Manual defrosting can be activated from the PRE-SELECTION, MANUAL CYCLE
RUN OPTIONS and AUTOMATIC CYCLE RUN OPTIONS menu.
Depending on the value of parameter d1, the machine will perform electric or hot gas defrosting cycles.
Defrosting will end on reaching the defrosting end temperature given by the parameter d2, if the evaporator probe is
enabled (parameter P3=1) or for maximum duration given by parameter d3. If the evaporator probe is enabled but
broken, defrosting ends due to maximum duration.
At the end of defrosting, the controller will perform a dripping time (d7) during which, all adjustment outputs will be
switched off. After dripping time, the cooling plant will start to operate again but the activation of the evaporator fan will
be delayed further by the time given by the parameter F12.
In the event of hot gas defrosting, the compressor must be activated for at least time d15 for the compressor to start.