ValveSixWay (FB)¶

FUNCTION_BLOCK ValveSixWay

Control a 6-way-valve with a heat / cool sequence.

Application example¶

6-way-valves has been developed and are used for heating / cooling ceilings control.

Device examples¶

Danfoss ChangeOver6 003Z3155 https://assets.danfoss.com/documents/152688/AI162886480177en-020605.pdf
Belimo EP015R-R6 https://www.belimo.com/mam/Datasheets/en-gb/belimo_EP..R-R6_BAC_datasheet_en-gb.pdf

Functionality¶

By construction 6-way-valves work in operation modes heat / cool / closed. Setpoints of the heat / cool sequence (0..100%) are scaled to the setting range of ValveSixWay (r*Begin..r*End - default 0..100%). The valve operation mode eModeIn can eventually provided by a specifc temperatur controller algorithm - in this case eModeOut follows the eModeIn. In case eModeIn is UNUSED, eModeOut is computed comparing rHeatSetpt / rCoolSetpt > 0.

Some controller algorithms may apply control range constraints - eventually a lower limit > 0%. In this case the setpoints of the heat / cool sequences will become inconsistent to determine the valve operation mode from. If the controller algorithm doesnt provides a valve operation mode, but inconsistent heat / cool sequences ValveSixWay falls back to heat.

Some real world 6-way-valves provide an operation mode input. Others 6-way-valves eventually miss such an operation mode input but require to map the tuple operation mode / valve setpoint to an “change over” control signal 2..10V / 0..10V according to datasheet (for an example see Belimo EP015R-R6 “conventional control”). To address this you can connect a HeatCool2Linear converter to ValveSixWay outputs.

InOut:

Scope	Name	Type	Initial	Comment
Input	`xEnable`	`BOOL`	TRUE	Enable
	`rHeat`	`REAL`		Heat control signal (0..100%).
	`rHeatBegin`	`REAL`	0.0	Heat control range begin (0..100%).
	`rHeatEnd`	`REAL`	100.0	Heat control range end (0..100%).
	`rCool`	`REAL`		Cool control signal (0..100%).
	`rCoolBegin`	`REAL`	0.0	Cool control range begin (0..100%).
	`rCoolEnd`	`REAL`	100.0	Cool control range end (0..100%).
	`eModeIn`	HeatCoolOperationMode	HeatCoolOperationMode.UNUSED	Controller operation mode.
Output	`rOut`	`REAL`		Valve control signal (0..100%).
	`eModeOut`	HeatCoolOperationMode	HeatCoolOperationMode.INACTIVE	Operation mode.
	`xError`	`BOOL`		Error - rEnd = rBegin or rSetpt out of range 0..100%.
	`eErrorID`	Error		Error ID