EVCO S.p.A.
Vcolor 869/879
| Installer manual ver. 2.2 | Code 144VC869E214
page 60 of 94
When regulating with 2 compressors, the differential set by parameter r0 will be halved: that means that the differential
for each compressor is “r0/2”.
When regulation requires the activation of both compressors, the second compressor will be activated with a delay set
by parameter C10.
11.4
Pump down solenoid valve management
This function is only available if one of the relays is configured as pump down
The pump down solenoid valve is activated in parallel with the compressor.
When the compressor is set to switch off, the pump down solenoid valve is deactivated first and after the number of
seconds set by the u12 parameter, the compressor is deactivated. This function is only available if parameter u2=0.
11.5
Evaporator fan management
The evaporator fan is managed in a modulating mode with the PWM analogue output (to be combined with the EVDFAN1
cutting-phase module) or in an On-Off mode if one of the relays is configured as evaporator fan. The two outputs (PWM
or relay) work independently one of another.
If the evaporator fan is managed through a PWM analogue output, the fan speed can be set for each phase. When the
fan is switched on, the controller will manage a speed (F21) and a start-up time (F22). After F22 time elapses, the fan
will modulate based on the speed set for the ongoing phase within the range set by parameters F19 and F20, which
determine the fan minimum and maximum speed respectively.
Calibration procedure for an evaporator fan managed by the cutting-phase module
In order to make the cutting-phase adjustment suitable to all 230 VAC single-phase motors, it is recommended to
perform a manual calibration of the evaporator fan.
1.
Set F19 to 0% and F20 to 100%
2.
Perform a manual cycle and, while modulating the fan speed, check the minimum percentage below which
the fan stops and the maximum percentage above which the fan runs at the maximum speed.
3.
The values obtained this way shall be set for F19 and F20 respectively..