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Access 5.x |
Electric heater configuration example |
The electric heater is activated by the start output of the Access controller. The electric heater is activated when demand for heating arises or with additional condition of minimal airflow - "flow interlock".
Flow interlock - the heater is only started if the fan has reached the minimal airflow required for fan run indication.
It is recommended to use heater with internal overheat protection. The output of the thermostat is captured by the input of the controller and is interpreted as an overheat alarm in case of tripping.
The table below shows a configuration example of the single stage electric heater with an alarm feedback.
Variable |
Available options & Selection |
Note |
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Sequence selection |
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Configuration > Functions > Function activation > Heating/Cooling sequence setup |
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Sequence for heating |
| SEQ-A Heating |...| |
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Sequence settings |
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Configuration > Functions > Function activation > Heating/Cooling sequence setup > Heating |
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Type of sequence |
|Cooling | Exchanger | Heating | Damper | Fan setpoint compensation | |
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Type of heater |
| Water | Electric | DX | Combi coil | |
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Type of feedback |
| None | Alarm | Run indication | |
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Digital start output |
| No | Yes | Yes with flow interlock* | |
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Sequence output when recirculation/support |
| 0% | 100% | Auto | |
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Sequence output min limit |
0% |
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Sequence output max limit |
100% |
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Sequence output when the unit is stopped |
0% |
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PID Settings |
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Configuration > PID controllers > Heating |
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P-band |
10 oC |
PID settings for the sequence |
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I-time |
100 s |
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D-time |
0 s |
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Hardwired interface to the heater |
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Configuration > I/O allocation settings > |
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Digital inputs > Overheated electric heater |
Any available I/O |
Overheat thermostat of the heater. Alarm 1075 Overheated electric heater is activated on DI tripping |
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Digital inputs > Feedback sequence |
Input for the pressure guard to give alarm if the airflow is insufficient (Topvex units) |
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Digital outputs > Heating start (SEQ-A) |
Start and capacity control signal outputs |
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Analog outputs > Heating (SEQ-A) |
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Heater starting and stopping |
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Data & Settings > Temperature control > Heating |
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Digital start output start point |
10% |
Output of the sequence to start and stop the heater (switching points for DO: Heating start) |
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Digital start output stop point |
1% |
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Graphical representation |
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Flowchart |
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90% - indication of sequence output |
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*Yes with flow interlock - The electric heater can only be activated if supply air fan is running (min flow for indication is reached) |
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