The mdp110 will be marked next to the terminals with : phase, N, load 1 & load 2.
Normal wiring would be Brown wire (power in) to phase terminal. Blue wire (neutral) to N. Two wires going to element (usually white or red) to load 1 & load 2. If you find the double element is the reverse of what it was before then swap load 1 & 2 wires around.
Lincoln Appliance NZ, August 2011