|
Access 4.x |
Liquid exchanger configuration example |
A mixing valve in the exchanger circulation system is controlled by the sequence.
The functionality of the pump control includes periodic pump exercise.
The Access also monitors if the pump is functional (run indication) when it is expected to run or if the pump has active alarms.
The table below shows a configuration example of the hardwired liquid exchanger.
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 | |
||
Pump control |
| No | Yes | |
||
Pump running mode |
| Always running | Auto | |
||
Type of feedback |
| None | Alarm | Run indication | |
||
Digital start output |
| No | Yes | |
||
Exchanger alarm |
| No | Yes | |
||
Type of defrosting |
| None | Temperature monitoring | |
||
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's pump & valve |
|||
Configuration > I/O allocation settings > |
|||
Digital inputs > Feedback exchanger (SEQ-B) |
Any available I/O |
Alarm input from exchanger pump. AL-37 if the digital input is tripped |
|
Digital outputs > Exchanger pump (SEQ-B) |
Pump start signal |
||
Analog outputs > Exchanger (SEQ-B) |
Exchanger sequence output (input for valve) |
||
Pump & Sequence control settings |
|||
Data & Settings > Temperature control > Exchanger |
|||
Pump stop delay |
5 min |
Delay for switching off the digital output: Exchanger pump (SEQ-B) |
|
Pump-kick hour |
15 h |
Daily exercise run of the pump starts at 15h |
|
Start delay exchanger |
0 s |
||
100% exchanger at start up |
2 s |
||
Graphical representation |
|||
Flowchart |
|||
|
"On" - indication of pump status 75% - indication of sequence output |
||
