Radiant panles
4-pipe heating and cooling
Function
The 6-Way Pressure Independent Control Valve (PICV) is used in 4-pipe water distribution systems with one single terminal unit for both cooling and heating. The room temperature is controlled by the BMS connected to the 6-Way PICV actuator. The switch over from cooling to heating and modulating control, can either be digital by Modbus and BACnet or analogue by 0-10 V or 4-20 mA.
Benefits
- The 6-Way PICV controls both cooling and heating in one single valve and ensures balancing of the flow and eliminates the use of static balancing valves and differential pressure control valves.
- Simple installation with only one 6-Way PICV valve and one actuator.
- Low total pressure loss in the system due to one single valve with high KV.
- The flow for both heating and cooling is set independently of each other, by the actuator, without the need of a manometer or a commissioning unit.
- The differential pressure only needs to be checked at the 6-Way PICV placed at the index point, or at the end of every branch.
Considerations
- The index valve will, in applications such as this with identical design and coil performance, be the one furthest from the pump, but it can be elsewhere in other layouts.
- In theory, PT-plugs are only needed on the index 6-Way PICV, but for commissioning and diagnostic purposes, it can be useful to have PT-plugs on every valve.
