EVCO EPU2LXP1CH Installer manual - Manual (Page 53)

EVCO S.p.A. c-pro 3 micro CHIL | Application manual ver. 1.0 | Codice 144CP3CHE104
page 53 of 120
CAUTION! When the machine type is changed, it is necessary to switch OFF and then back ON the plant, to enable the unit to
reconfigure itself correctly; to allow the card to assign all affected parameters, it is advisable to wait for a few seconds (3 seconds are
more than ample time), before interrupting the unit’s power supply.
8.3 Configuration of Circuits
In case of dual refrigerant circuits (PG01=2), some basic features need to be defined:
1. Single or dual condensing units (parameter PG11)
This configuration has an effect:
• On condenser control, in case of a single fan, the control is based on the highest value of the condenser
pressure/temperature.
• On heat pump units during defrost control, in case of a single fan it is not possible to carry out separate defrosting of
each circuit.
2. In case of ZERO ENERGY BAND control (PC11=1), compressor control is based on the average value of the two evaporate
leaving temperature sensors. Via parameter PC02, it is possible to select the distribution of the chilling steps required by
controlling the two compressor circuits;
a. PC02=0 the 2 circuits are balanced
b. PC02=1 saturates the steps of one circuit, before requesting any of the other.
3. In case no compressor is running, the 2 evaporate temperature sensors will decide which compressor circuit must be started
first
a. In case of mode=Cool (chiller), the circuit with the highest evaporate leaving temperature will start first
b. In case of mode=Heat (heat pump), the circuit with the lowest evaporate leaving temperature will start first
4. Evaporating single or separated (PG12)
In case of evaporating single (PG12=1), the management, the resistors and the alarm of anti-frost are single. Control is
carried out by reading the highest of the temperature value from water leaving temperature sensor.
With evaporating single the activated resistors and anti-frost alarm are always that related to Circuit # 1, Circuit # 2 is not
controlled.