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Mk2 Heat Pump Interface DIP switches

This article outlines how to set the DIP switches on the Mk2 HP Interface Unit.

The heat pump interface uses DIP switches to set a resistance that emulates the heat pump’s temperature sensor.

Once set the resistances can be checked by measuring between the COM to HOT or COM to COLD test points next to the large relay, while the unit is electrically isolated.

Note: When using the Heat Pump DHW temperature probe the Cold Dip switches must all be set to the off position.

Switch  number Mitsubishi LG Vaillant
Hot Cold Hot Cold Hot Cold
1* On On On On On On
2 Off On On On On Off
3 On Off On Off On Off
4 On Off Off Off Off Off
5 Off On On On Off On
6 Off On Off On On On
7 On On On On On Off
8 On Off On Off On On
9 On On On On On On
10 On On On On On On
11 On On On On On On
12 On On On On On On
13**   On   On   On
14**   On   On   On
Total resistance 1280 3600 1020 3600 610 1990
Switch  number Hitachi Nibe Samsung
Hot Cold Hot Cold Hot Cold
1* On On On On On On
2 On On Off Off Off On
3 Off On On Off On Off
4 Off On Off Off On On
5 On On Off On On On
6 On On On On On Off
7 On On On Off Off On
8 Off On On On Off Off
9 On On On On On Off
10 On Off On On On Off
11 On On On On On Off
12 On On On On Off On
13**   On   On   Off
14**   On   On   On
Total resistance            
Switch  number Daikin High Temp Daikin Low Temp PT1000
Hot Cold Hot Cold Hot Cold
1* On On On On On On
2 On Off Off Off On On
3 Off On On Off On Off
4 Off Off Off Off On Off
5 Off On On On Off On
6 On On Off On Off Off
7 On Off Off Off On On
8 Off Off Off On On On
9 On Off On On On On
10 On Off Off Off On On
11 On On Off Off On On
12 On On On Off On On
13**   On   On   On
14**   On   Off   On
Total resistance 4010 24990 45010 291990 1230 1120
Switch  number Midea Panasonic Ecoforest/Viessman
Hot Cold Hot Cold Hot Cold
1* On On On On On On
2 Off On On Off Off On
3 Off On Off On On On
4 Off Off Off Off On Off
5 Off On Off Off On On
6 Off On On Off Off On
7 Off On On On Off On
8 On On On On On On
9 Off Off On On On Off
10 On On On On On On
11 On Off On On On On
12 On On On On On On
13**   On       On
14**   On       On
Total resistance 10020 33000 710 1480 2510 7000
Switch  number ATAG Dimplex  
Hot Cold Hot Cold Hot Cold
1* On On On On    
2 Off On Off On    
3 On On Off On    
4 On Off On Off    
5 On On Off On    
6 Off On Off On    
7 Off On Off On    
8 On On On On    
9 On Off On Off    
10 On On On On    
11 On On On On    
12 On On On On    
13**   On   On    
14**   On   On    
Total resistance 2510 7000 3020 7000