EVCO c-pro kilo AHU - Manual (Page 76)

C-PRO KILO AHU APPLICATION MANUAL
Pag. 76
6.14 Unit at single coil (seasonal)
In this type of unit (PG01=1) there is only one dedicated valve for heating and cooling and, if
enabled, there is a single circulation pump; the operating mode (parameter MOdE)
determines which behavior to utilize. In the same way all the regulations (fans, free-
cooling/free-heating, regulations of set-point, alarms, etc..) are distinguished based on the
operating mode. The heating function is guaranteed when the parameter MOdE=1;
meanwhile the cooling function is guaranteed when MOdE=0.
The correct software configuration is obtained considering all the resources (parameters and
operating states) normally utilized for heating the machine when using more than one coil,
which, in these particular centers, are considered mixed resources commanded univocally
based on operating mode (summer/winter). The “mixed” hardware parameters to consider
for the unit at single coil with circulation pump are the following:
PG01=1 (single coil)
PG10: enable circulation pump (heating)
HP01: position of circulation pump digital output (heating)
Hd10: position of circulation pump alarm (heating)
HA04: position of heating/cooling valve analogue output (heating)
For units using a single coil it is not possible to manage dehumidification and post-
heating. The resources normally managed for cooling and post-heating are not piloted; it is
therefore recommended to reset all the configuration parameters in order to avoid
malfunctions.
16.14.1 Primary regulation
For these types of units it makes sense to also set the primary regulation parameter PG04;
using the appropriate constructor parameter, PG04, it is possible to choose the organ on
which the primary regulation will be made from the central unit: fans or valves.
- If PG04 = 0, the primary regulation is made on the fans which, at the appropriate
time, will be regulated in different ways (parameter PF01). This type of configuration
excludes utilization of the valve and therefore the controller does not provide any
commands on the analogue/digital outputs for controlling the single heating/cooling
valve.
- If PG04=1, the primary regulation is made on the valve. The intake of hot/cold air is
modulated by the heating/cooling coil, meanwhile the fans are working to recirculate
the air of the central unit. Fan regulation can be set with the appropriate parameter
PF01. In this configuration it is necessary to determine the position of the analogue
output which will be connected to the single valve of regulation.
In units with more than one coil the parameter PG04 does not condition any regulation.