Mitsubishi MT300 User Manual

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Installation
'10 • HM-T-149
A current sensor should be installed on each incoming phase
conductor in to the distribution box to measure the current. The
distribution box is an appropriate installation point.
Connect the current sensor to a multi-core cable in an enclosure
next to the distribution box. Use unscreened multicore cable of
at least 0.50 mm
2
,fromtheenclosuretoindoorunit.
In indoor unit connect the cable to the PCB (AA22) on terminal
X1:8–11.
L1 connects on X1:8 and X1:11.
L2 connects on X1:9 and X1:11.
L3 connects on X1:10 and X1:11.
X1:11 is the common terminal block for the three current
sensors.
1
2
3
4
5 6
7
8
AA22-X1
L1
L2
L3
9
10 11
12 13 14 15
16
17
Connection of centralised demand control/tariff
In case centralised demand control or tariff control is used this
can be connected to the terminal block (X1) on the PCB
(AA22).
Tariff A prohibits energizing immersion heater. It is valid when
X1:5 and X1:7 is closed.
Tariff B prohibits heat pump operation. It is valid when X1:6
and X1:7 is closed.
Tariff A and B can be used in combination.
Connecting external contacts
MH-RG 10, sensor for changing the room temperature
Anexternalsensor(MH-RG10)canbe connectedto indoor
unit to change the flow temperature and the target room
temperature. Connect the sensor to the terminal block from
X4:1 to X4:3 on the PCB (AA22) according to wiring diagram.
Activated in Menu 9.3.6.
The target supply water temperature is adjusted according to the
gap between actual room temperature and set room temperature.
ThesetroomtemperatureissetusingtheknobonMH-RG10
and is shown in Menu 6.3.
Inaddition,theheatingsystemtowhichthecontrolisvalidcan
be chosen in Menu 6.2.
Iutdoor unit installation
PCB, terminal and wiring diagram
The following connections are made on the PCB (AA22).
See wiring diagram for complete wiring diagram of the PCB.
<HMA100V, HMA100VM>
AA22-X1
AA22-X4
AA22-X2
AA22-R24
AA22-R25
AA22-R26
<HMS140V>
Connecting the outdoor air sensor
Install the outdoor air temperature sensor in the shade on a wall
facingnorthornorth-west,soitisunaffectedbythemorning
sun. Connect the sensor to terminal block X1:1 and X1:2 on
the PCB (AA22) via cable gland UB2. Use a 2 core cable of at least
0.5 mm
2
.
If the outdoor air temperature sensor cable runs close to power
cables,shieldedcablemustbeused.
If a conduit is used it must be sealed to prevent condensation in
the sensor capsule.
Connecting the current limiter
When many electrical appliances are connected in the property
atthesametimeastheelectricheaterisoperating,thereis a
risk of the property’s main fuse tripping. Hydrolution is
equipped with an integrated current limiter that controls the
electricalstepsandthecompressor.Ifnecessary,theelectrical
steps are disengaged and/or the compressor frequency is
reduced.
AA22-X1
AA22-X4
AA22-X2
AA22-R24
AA22-R25
AA22-R26

Mitsubishi MT300 Specifications

General

Brand	Mitsubishi
Model	MT300
Category	Heat Pump
Language	English