| Features | MW Jr. | MW Sn. | MW Sl. | WSI |
| Input | Temperature-sensor | Temperature-sensor | 1.5-9.5 V | 9.5-1.5 V (inversed) |
| Fan stop adjustment -6 to +2°C, normally -2°C |
No | Switch | Switch | No |
| Band-width, adjustment 2-10°C , normally 4°C |
Yes | Yes | No | No |
| User Button to control minimum ventilation |
Yes | Yes - controls fan and damper motors |
No | No |
| MIN-speed, adjustment normally 80 V |
Yes | Yes | Yes | Yes |
| MAX-speed, adjustment normally 210 V |
Yes | Yes | Yes | Yes |
| 0-10 V outputs, control- signals for actuators "SERVO1": inlet "SERVO2": exhaust Adjustment: SERVO2 = 0.5-2 x SERVO1, normally 1.6 |
No | Yes | No | No |
| Potentiometer for reducing control-signal in cool weather Reducing solely "SERVO1" Terminals for outside termostat |
No | Yes | No | No |
All models are available for either 5, 8 or 10 Amps of maximum power consumption of the fans.
Mw Sl. slave unit is used to control fans when power consumption exceeds the capability of one controller. More units can be controlled by the same control signal.
WSI slave unit is used to control fans which should operate inversed i. e. maximum speed when its cold, and minimum speed when its hot.
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