Min/max control by the VAV Compact Controller - Basic Documentation - GDB181.1E/BA - GDB181.1EMBA - GLB181.1E/BA

When setting the minimum / maximum air volume flow in the VAV Compact Controller, the supervisory controller must be set to V_min= 0% und V_max = 100 %. With this setting, the supervisory controller reference signal for both the supply air and extract air controller is the same. Thus, supply air / extract air control with a single reference signal is possible.

Setting example B1

VAV ratio control 1 : 1

Reference signal: Y_{supply_air} = Y_{extract_air} = 25 %

Result: V_{supply_air} = V_{extract_air} = 35 %

Setting example B2

VAV ratio control, 20 % constant excess supply air volume flow (positive pressure in the room)

Reference signal: Y_{supply_air} = Y_{extract_air} = 25 %

Result: V_{supply_air} = 35 %, V_{extract_air} = 15 %

Setting example B3

VAV ratio control, 20 % constant excess extract air volume flow (negative pressure in the room)

Reference signal: Y_{supply_air} = Y_{extract_air} = 25 %

Result: V_{supply_air} = 35 %, V_{supply_air} = 55 %