Rotational speed of the rotary heat exchanger is controlled either via internal data bus or analog signal (in hardwired rotary drive option).


The table below shows a configuration example of the hardwired rotary exchanger control with alarm monitoring.



Variable

Available options & Selection

Note


Sequence selection

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

Sequence for exchanger

| SEQ-A | SEQ-B Exchanger |...|



Sequence settings

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

Type of sequence

|Cooling | Exchanger | Heating | Damper | Fan setpoint compensation |


Type of exchanger

| Rotary | Plate | Liquid |


Digital start output

| No | Yes |


Exchanger alarm

| No | Yes |


Type of defrosting

| None | Temperature monitoring |


Frost prevention rotating exchanger

| 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%



PID Settings

Configuration > PID controllers > Exchanger

P-band

10 oC

PID settings for the sequence

I-time

100 s

D-time

0 s


Hardwired interface to the Exchanger controller

Configuration > I/O allocation settings >

Digital inputs > Rotary exchanger alarm

Any available I/O

Alarm input from exchanger controller. AL-67 if DI is tripped

Analog outputs > Exchanger (SEQ-B)

Sequence output to the exchanger controller


Sequence control settings

Data & Settings > Temperature control > Exchanger

Start delay exchanger

0 s


100% exchanger at start up

2 s



Graphical representation

Flowchart


75% - indication of sequence output