Assortment / System Description

Heat pump application
Serial or parallel control strategy
20
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20 Heat pump application
The heat pump application can be configured using a heat pump application
type. Each heat pump application type can also combine a ceiling
heating/chilled ceiling (beam) or radiator application. The image below
provides an overview of the heat pump application type with all possible HVAC
components that can be configured for a heat pump application. The
configuration enabled the applicable (required) aggregate on the DXR2.
Figure: Application types for heat pump applications
Key:
DXR2… Automation Station D2 Window contact
B1 Return air temperature sensor HP Heat pump
B2 Mixed air sensor Q1 Fan
B3 Supply air sensor R1 Room operator unit
B9 Outside temperature sensor YH/YR Hot water heating coils or electric
heating coils
D1 Presence YM Damper actuator
20.1 Serial or parallel control strategy
You must select one of 2 different control strategies on all heat pump
applications:
● Serial fan operation: The air volume is only increased if the heat pump'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 heat
pump's or reheater's positioning signal.
The following examples illustrate the two strategies based on a modulating fan
and modulating heat pump. Both strategies can be used in the same manner for
staged fans/heat pumps.
Plant diagram