Mitsubishi MT300 User Manual

Installation
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73
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'10 • HM-T-149
Contact for changing the room temperature
An external contact such as a room thermostat or a timer can
beconnectedtoindoorunittochangetheowtemperatureand
consequently the room temperature. The contact must be
potential free and non-locking.
Whenthecontactisclosed,theheatingcurveoffsetischanged
by the number of steps shown here. The value is adjustable
between -10 and +10. It is possible to set the offset value on
system 1 and 2 independently.
Terminals to be connected
Heating system 1: X1:3 and X1:4 on the PCB AA22
Heating system 2: X1:14 and X1:15 on the PCB AA22
Menu to change the offset value
Heatingsystem1:Menu2.4“Externaladjustment”
Heatingsystem2:Menu3.5“Externaladjust.2”
Contact for activation of “Extra hot water”
An external contact can be connected to HM270V for activation
ofthe“Temporaryextrahotwater”function.Thecontactmust
be potential free and non-locking and connected to terminal
block X6:1 and X6:2 on PCB (AA22).
When the contact makes for at least one second, the
“Temporary Extra hot water” function is activated. The
function is cancelled automatically after 3 hours.
Alarm outputs
External indication of common alarms is possible through the
relayfunctiononthePCB(AA22),terminalblockX2:1–2.
Whenswitch(SF1)isinthe“0”or“
”positiontherelayis
in the alarm position.
Docking specific connection
Hydrolution is prepared to control an external circulation pump
(GP10andEP21−GP10),externalmixingvalve(EP21−QN11),
shuttle valve for cooling (QN12), as well as external heat
sourcee.g.oil,gasorpellets.
External circulation pump (GP10, accessory)
Connect external circulation pump (GP10) to terminal block
X3:1(230V),X3:4(N)andX3:5(PE).Maxoutputis50W
Thecirculationpump(GP10andEP21−GP10)isactivewhen
the circulation pump (GP1) in indoor unit is active.
External mixing valve (EP21-QN11, accessory)
Connection and function are described in the Installation
instructions for accessory ESV 22.
Shuttle valve, cooling (QN12, accessory)
Connection and function are described in the Installation
instructions for accessory VCC 22.
External heat source control
Hydrolution can control an external heat source.
ON/OFF control of the external heat source can be done by
following settings.
1. RemovethestraponterminalblockX3:2andX3:3.
2. Connect the signal input line to terminal block X3:2 (230 V)
and X3:4 (N) (max 0.2 A).
3. Set“Ext.1step”inMenu9.2.8.
Indoor unit installation
NOTE
Be sure to install ow relief valve when an external
circulation pump is installed.
The circulation pump may become damaged.

Mitsubishi MT300 Specifications

General

Brand	Mitsubishi
Model	MT300
Category	Heat Pump
Language	English