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Access 5.x |
Boost heater for the Reversible heat pump |
For heat pump options a boost heater is available when re-heaters are not possible to use.
This heater is an electric heating-coil mounted between rotor exchanger and supply-air coil for heat pump.
Boost heater is configured in separate sequence SEQ-J External Heating/cooling capacity in sequence order after heat pump.
When the maximum capacity is limited (e.g., frost limitation on rotary exchanger, risk of low pressure etc.), the boost heater increase heats up the incoming air into the condensing coil (supply air coil on heat pump) and helps heat pump to reach the necessary supply air setpoint (normally 20°C) without a re-heater.
Adding boost heater to the heat pump |
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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 the boost heater |
|...| SEQ-J External Heating/cooling capacity | |
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Sequence settings |
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Configuration > Functions > Function activation > Heating/Cooling sequence setup > External Heating/cooling capacity |
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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 | |
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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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Configuration of Modbus connected Heat pump |
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Configuration > System settings > Communication Devices > Device 20 |
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Type |
| Disabled | ... | Heat pump (Modbus) | |
Select type of the connected device (Heat pump) |
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Brand |
| 1 Circuit | | 1 Circuit with Boost heater | | 2 Circuit | | 2 Circuit with Boost heater | |
Select type of the Heat pump with a boost heater |
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... |
... |
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Hardwired interface to the boost heater |
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Configuration > I/O allocation settings > |
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Input / Output |
Device |
Position |
Assign Input/output connection of the boost heater |
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Digital inputs > Feedback external heat/cool (SEQ-J) |
RHP-DF (Device 20) |
U7 |
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Analog outputs > External heating/cooling (SEQ-J) |
RHP-DF (Device 20) |
Y1 |
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Digital outputs > External heating/cooling start (SEQ-J) |
RHP-DF (Device 20) |
NO4 |
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Flowchart Settings |
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Configuration > Functions > Flow chart setup |
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... |
... |
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Position Exchanger-Supply air |
| None | | Reversible heat pump Supply air - Extract air | |
Boost heater icon appears in the flowchart
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