EVCO EPK4BHQ1AH Installer manual - Manual (Page 75)

EVCO S.p.A. c-pro 3 NODE kilo AHU | Application manual ver. 1.0
page 75 of 114
6.12 Cooling and heating controls
When the primary control is based on the valve (PG04=1) it is possible to control the heating and cooling valves.
The control is based on a cascade controller, the discharge air temperature set point is adjusted by the room
temperature deviation. The valve is proportional algorithm (P) or a proportional integral (PI) controlled. The referenced
sensor is that of the flow temperature.
Note: with the unit running on a single coil, enabling the valve will depend on the type of primary control that is
chosen. If the parameter PG04=0, primary control on the fans, the valve remains disabled. In order to utilize you will
need to set PG04=1 (primary control on the valve).
PG04: primary control mode (fan, valve)
6.12.1 Floating set point floating from flow
If the discharge air temperature sensor is present it is preferable to use an algorithm which, in relation to the shifting
between set points and room temperatures, stabilizes the temperature value required for air supply and thus effects
the action of the control module on the valve. The discharge air temperature set point is calculated based on the set
point room temperature.
The Minimum Limit and the Maximum Limit are expressed as temperature offsets (Pb05) with respect to SEtC (SEtH, if
unique set point), environment regulation set point. The neutral zone is the same zone which is set for the control of
the coils on the flow temperature.
Note: setting Pb05=0.0 the function is as if it were disabled; in this case the discharge air set point is equal to the
room set point.
T. room
Minimum
Pb06:
Supply Setp
Maximum
Pb05: Diff.
Room Set Point
SEtC, SEtH
Pb05: Diff.
Pb06: Pb03: ZN
Room Set Point