EVCO c-pro micro SAVE - Manual (Page 43)

C-PRO MICRO SAVE APPLICATION MANUAL
Page 43
6.7.4.4 Heaters over temperature protection with automatic reset
By setting the parameter PA16=1(high temperature) it is possible to decide whether to use the
supply high temperature alarms or not. The following parameters must be configured in order to use
these alarms:
- PA17 = Automatic reset over temperature protection Set Point
- PA19 = Temperature alarm differential
- PA20 = Temperature alarm activation delay
The alarms are signalled after the PA20 delay time have automatic reset. The alarms are disabled in
case of alarm condition on the supply temperature probe. These alarms can only be activated with
the unit running.
6.7.5 Heat exchanger by-pass in summer mode (Free-Cooling)
During summer cycle, when the outside temperature is low enough it is possible to take advantage
of the outside air for cooling down the internal ambient by means of the by-pass damper. Set
PG08=1 to enable this function. This function uses the outside air temperature probe (TExt) and the
return temperature probe (TInt).
When TExt ≥ Tke (default 15 °C, it can be modified by parameter Pr04) and return temperature
TInt ≥ Tki (default 22 °C, it can be modified by parameter Pr05) and if TExt ≤ TInt the function is
active and opens the heat exchanger by-pass damper.
Note: To use this function the outside and return temperature probes must be enabled, respectively PH43=1 and
PH41=1. If one of the two probes is in error condition the function is disabled.
6.7.6 Modulation of the air flow with CO
2
probe
This function is enabled by setting PF01=3 and can be enabled only during COMFORT time
bands. In this configuration the fan speed control is based on the value sensed by the CO
2
probe.
The fans speed depend on the value set on parameters PF14, PF15 which indicate the set for CO
2
concentration for each of the three speeds. In this state the minimum speed is V1.
Example. Parameters default
CO2 probe
0V -> PH03 = 100 ppm
5V -> PH04 = 1100 ppm
Fans
PF14 = 500 and PF15 = 1500 ppm.
Speed 1 for measured value < 500 ppm
Speed 2 for measured value between 500 ppm (included) and 1500 ppm
Speed 3 for measured value ≥ 1500 ppm
Note: To use this function the CO
2
probe must be enabled (parameter PH42=1) along with the relevant linearisation
values (parameters PH03 and PH04). If the RTC clock is in error condition it is possible to set parameterPF05 which
defines the fans speed in this condition.
6.7.7 Heating control depending on Return Air Temperature
It is possible to decide whether to control the space heating (by means of hot water coil or electric
heaters) depending on the return ait temperature instead of on the supply air temperature (Pb01=0).
To use this function set Pb01=1 and also set the SPHR parameter indicating the value of the
regulation set point on the return air temperature. To use of this the return air temperature probe
must be enabled (PH41=1).