Mitsubishi MT300 User Manual

'10 • HM-T-149A
41
Gas
Function
Hydrolution engages additional heat source when the compressor
output is not sufcient 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 ow line. Hot water can be
produced with the addional heat source.
Max temp should be 65°C out from the gas red 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.
Alt 1: The gas boiler runs continuously. Indoor unit controls
the circulation pump.
Alt 2: Condensing gas boiler with internal circulation pump.
Indoor unit provides the gas boiler with start and stop signals.
NOTE
Maximum current on the terminal block X3 is 0.4A
↑ Connected to X3:2 and X3:4 with the jumper wire on X3:2-3 removed.
For details, see page 75.
External heat source
System description
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119
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Mitsubishi MT300 Specifications

General

Brand	Mitsubishi
Model	MT300
Category	Heat Pump
Language	English