his High altitude control unit is suitable for air heaters AUTOTERM Air 4D with a specific serial number.
Suitable for heaters with the following serial numbers:
This 12V control unit is compatible with AUTOTERM Air 4D heaters equipped with the following air pumps (assy numbers):
Heater equipped with this control unit can work at altitude up to 2500 meters above sea level (MASL).
Interchangeable control units.
| Heater |
serial number |
control unit |
Glow plug |
HA control unit |
HA Glow plug |
| 4D12 |
4142…. |
Assy.4144 |
Assy.3333 |
Assy.4002 |
Assy.3333 |
| 4D24 |
4137…. |
Assy.4139 |
Assy.3333 |
Assy.4188 |
Assy.3333 |
| 4D12 |
3046…. |
Assy.3048 |
Assy.2288 |
Assy.4002 |
Assy.3333 |
| 4D24 |
3031…. |
Assy.3033 |
Assy.2253 |
Assy.4188 |
Assy.3333 |
In order to change the control unit for 4D with control units assy.3048 and assy.3033, you have to change the Glow plug as well.
