EVCO S.p.A.
Vcolor 679/689
| Installer manual ver. 1.0 | Code 144VC679E104
page
36
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70
9
REGULATIONS
9.1
Pre-cooling (for retarding-proofing only)
The purpose of the pre-cooling cycle is to bring the cabinet to a certain temperature (set by parameter rC6) before selecting and
running a retarding-proofing cycle.
During a pre-cooling cycle, the compressor, condenser fans, pump-down solenoid valve (if enabled) and evaporator fan work to reach
the set temperature.
The pre-cooling setpoint can be changed at any time during the cycle and the new value set will be reused when the next cycle is
selected.
The pre-cooling cycle continues until the STOP key is pressed or until a retarding-proofing, cooling or heating cycle is started up by the
user. Once the pre-cooling temperature has been reached, the buzzer sounds intermittently, indicating that the machine is ready to run
the cycle. The buzzer is silenced when any key is pressed or after the time set by parameter E1.
N.B.:
the cycle cannot be run if there is a HIGH PRESSURE, HIGH EVAPORATOR TEMPERATURE, CABINET PROBE, CONDENSER
PROBE, HUMIDITY PROBE or THERMAL SWITCH alarm.
9.2
Temperature regulation
Temperature regulation for all phases of the equipment is in the neutral zone in which two relative values are set one above and one
below the temperature setpoint, thus creating a zone inside which the loads for heating and cooling are not activated.
When the temperature rises above the neutral zone value beyond the threshold set by rC0 (cooling differential), the cooling loads are
activated until the temperature returns to the neutral zone value.
Similarly, when the temperature falls below the neutral zone value beyond the threshold set by rH0 (heating differential), the heating
loads are activated until the temperature returns to the neutral zone value.
9.2.1
Generating cooling (for retarding-proofing only)
Cooling is generated by the refrigeration circuit installed in the equipment.
When cooling is required, the compressor output and the pump-down solenoid valve output (if enabled) are activated.
The evaporator fan operates continuously or in parallel with the compressor, according to how the parameters have been configured for
each phase and on the basis of the speed set for the phase in progress.
9.2.2
Generating heat
Heat is generated by a heater.
When heating is required, the heater output is activated, with the possibility of running a duty switch on/off cycle (set by parameters
rH6 and rH7), so as to limit the heating power if a very powerful heater is being used and thus avoid the cabinet overheating.
The evaporator fan operates continuously or in parallel with the heater output, on the basis of the speed set for the phase in progress.
