Assortment / System Description

Fan coil application
Serial or parallel control strategy
17
92 | 275 A6V10866237_en--_b_08
17 Fan coil application
The fan coil application can be configured with a fan coil application type. Each
fan coil application type can also combine a heated/chilled ceiling (beam) or
radiator application. The image below provides an overview of the fan coil
application type with all possible HVAC components that can be configured for
a fan coil application. The configuration enabled the applicable (required)
aggregate on the DXR2.
Figure: Application types for fan coil applications
Key:
DXR2… Automation Station Q1 Fan
B1 Return air temperature sensor R1 Room operator unit
B2 Mixed air sensor YC Chilled water cooling coils
B3 Supply air sensor YH Hot water heating coils or electric
heating coils
D1 Presence
D2 Window contact YHC Heating/cooling coils
D3 Outside temperature sensor YM Damper actuator
17.1 Serial or parallel control strategy
You must select one of 2 different control strategies on all fan coil applications:
● Serial fan operation: The air volume is only increased if the valve's or
reheater's positioning signal is fully open and the room temperature
exceeds or breaches an additional offset.
● Parallel fan operation: The fan speed is increased in parallel to the valve's
or reheater's positioning signal.
The two strategies are illustrates in the following example using a modulating
fan and one heating and cooling valve. Both strategies can be used in the same
manner for staged fans.
Plant diagram