Mitsubishi HMA100V Technical Manual page 270

'10 • HM-T-149A
System description
External heat source
Oil
↑ Connected to X3:2 and X3:4 with the jumper wire on X3:2-3 removed.
For details, see page 75.
Function
Hydrolution engages additional heat source when the compressor
output is not sufficient for the house demand.
When the additional heat source is connected, valves QM 30
and QM31 shift to the heating system. Valve QN11 shunts in
the event of a heat demand on the flow line. Hot water can be
produced with the additional heat source.
Max temp should be 65°C out from the oil/pellet boiler.
Control signal for additional heat source taken from terminal
block X3.
Jumper wire between X3:2-3 must be removed.
The control signal input is connected to terminal block X3:2
(230V), X3:4 (N).
Temperature sensor BT19 should be replaced to the position
BT24 in order to control gas boiler appropriately.
Menu 9.2.8 set to External Line 1.
The oil fired boiler is started and stopped by external control.
Indoor unit controls the circulation pump.
NOTE
Maximum current on the terminal block X3 is 0.4A
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