The air handling unit section with heat pump is a separate section, containing a fully integrated, complete standalone reversible heat pump system (heating and cooling). All refrigerant system components are fully integrated into the unit. The refrigerant is evaporated and condensed directly in the integrated coils, and the capacity is controlled automatically and steeples between 5 and 100 %.


The table below shows a configuration example of the single stage Reversible Heat pump.



Variable

Available options & Selection

Note


Sequence selection

Configuration > Functions > Function activation > Heating/Cooling sequence setup

Sequence for heating

|...| SEQ-G Heating 2 | SEQ-H |...|


Sequence for cooling

|...| SEQ-G | SEQ-H Cooling 2 |... |



Sequence settings

Configuration > Functions > Function activation > Heating/Cooling sequence setup > Heating 2

Type of sequence

|...| Heating |...|


Type of heater

| Water | Electric| DX | Combi coil |


Type of feedback

| None | Alarm | Run indication |


Digital start output

| No | Yes |


Sequence output when recirculation/support

| 0% | 100% | Auto |


Sequence output min limit

0%


Sequence output max limit

100%


Sequence output when the unit is stopped

0%


Configuration > Functions > Function activation > Heating/Cooling sequence setup > Cooling 2

Type of sequence

|Cooling |...|


Type of cooler

| Water | DX | DX with exchanger control |


Type of feedback

| None | Alarm | Run indication |


Digital start output

| No | Yes |


Sequence output when recirculation/support

| 0% | 100% | Auto |


Sequence output min limit

0%


Sequence output max limit

100%


Sequence output when the unit is stopped

0%



Changeover settings

Configuration > Functions > Function activation > Heating/Cooling sequence setup > Changeover settings

Changeover 1



Changeover sequence for heating

… | Heating 2 | …


Changeover sequence for cooling

… | Cooling 2 | …


Changeover 2



Changeover sequence for heating

… | Disabled | …


Changeover sequence for cooling

… | Disabled | …



PID Settings

Configuration > PID controllers > Heating 2

P-band

10 oC


I-time

100 s


D-time

0 s


Configuration > PID controllers > Cooling 2

P-band

10 oC


I-time

100 s


D-time

0 s



Hardwired interface to the pump & valve

Configuration > I/O allocation settings >

Digital inputs > Feedback cooling 2 (SEQ-H)

Any available I/O


Digital inputs > Lock PID controller supply


Digital outputs > Cooling 2 start (SEQ-H)


Digital outputs > Changeover 1


Analog outputs > Changeover 1



Heater starting and stopping

Data & Settings > Temperature control > Heating 2

Digital start output start point

10%

Output of the supply controller to start and stop the heater

Digital start output stop point

1%


Cooling control settings

Data & Settings > Temperature control > Cooling

Digital start output start point

10%

Output of the supply controller to start and stop the DX cooler

Digital start output stop point

1%

Block DX-cooling if outdoor temperature <

0 oC


Block DX-cooling if supply air fan output signal <

0%


Hysteresis if outdoor temperature block

1 oC


Reduction of min limit supply air is active DX-cooling

5 oC



Graphical representation

Flowchart


37% - indicates the output of either Heating 2 sequence or Cooling 2 sequence (depending if there is a demand for heating or cooling)