EVCO EPH4DXP1CT Installer manual - Manual (Page 62)

Evco S.p.A. c-pro 3 CLIMA sistema | Installer manual ver.1.1 | Code 144CP3CSE114
page 62 of 74
• Management of the water heater (boiler): correct operation of the boiler is controlled by a digital
input block heater that, if activated, will immediately block the user
• Management of the heat pump : the correct operation of the heat pump is controlled by a digital
input alarm chiller-heat pump that, when activated, will immediately block the user.
• Management of the water heater and the heat pump, the heat pump will always have priority with
respect to the activation of boiler, which will be activated in the following cases, simultaneously
with the deactivation of the heat pump:
1) Activation of digital input alarm chiller-heat pump
2) Outdoor temperature below the set value with the appropriate parameter (for then poor performance of the
heat pump due to low outdoor temperature)
3) Achieved number of hours of continuous activation of the heat pump
The correct operation of the boiler is always controlled via the digital input block heater that, if activated, will
immediately block the user.
In case N°3, the intervention of the digital input boiler block will cause the automatic reactivation of the heat pump
utility.
8.2.3 Management of the utility set-up for cooling delivery water: the
chiller (MCCT module)
During summer regulation, once water has been made to circulate in the system, whenever the delivery temperature
is above the Summer delivery work set-point of the hysteresis value, then a chiller activation request will be sent.
Correct chiller functioning is controlled via a chiller-heat pump digital input alarm which, whenever activated, will block
the utility immediately.
8.2.4 Delivery work set-point (MCCT module)
The working setpoint discharge summer/winter is set to manual mode during installation of the system by authorized
personnel.
The working setpoint flow corresponds to the actual setpoint adjustment only in the case in which there is no flow in
the mixing valve.
8.2.5 Output of the delivery mixing valve (MCCT module)
The thermal power plant controller can regulate a mixing valve for every delivery line, via two 0-10V proportional
analogue outputs.
If the mixing valve check is enabled, the regulation set-point of the delivery line will be given by the regulation set-
point calculated for the valve
The mixing valve control can be enabled individually for each delivery line.
Normally the mixing valve is used for low temperature delivery lines in high-low temperature systems.
It is possible to set the functioning mode of the mixing valve for the distinct summer and winter functioning mode
among the following possibilities:
- Valve forced closed: the valve remains always closed during the entire functioning independently from the
system functioning conditions.
- Valve forced open: the valve remains open at the percentage set until the regulation is active, with regulation
off the valve is closed.
- Valve in modulation: the opening of the mixing valve is controlled on the measurement of the delivery water
temperature with respect to the regulation set-point.