2-Zone Valve On/Off Control; Indoor Unit Only Operation (During Installation Work); Remote Controller Options - Mitsubishi Electric ecodan EHPT20Q-VM2EA Installation Manual

5
System Set Up

5.3 2-zone valve ON/OFF control

Opening /closing 2-way valve provides a simple 2-Zone control.
Flow temperature is common for Zone1 and 2.
1. Pipework
1
3
2
2. DIP switch
Turn DIP switch 3-6 ON.
3. 2-way valve 2a (for Zone1) / 2-way valve 2b (for Zone2)
Electrically wire 2-way valve 2a and 2b to the appropriate external output terminals. (Refer to "External outputs" in 5.2)
4. Room thermostat connection
Heating operation mode Zone1
Room temp. control
(Auto adaptation) *2
*2 Ensure to install the room thermostat for Zone1 in main room since the Room temp. control for Zone1 is prioritized.
*3 In this case, the wireless remote controller can be used as a thermostat.

5.4 Indoor unit only operation (during installation work)

In the case when DHW or heating operation is required prior to connection of the outdoor unit; i.e. during installation work, the booster heater in cylinder unit can feasibly
be engaged as the sole heat source (short - term operating condition).
For this scenario, the installer will have to form a temporary pipe loop connection across cylinder's heat pump connections.
1. To start operation
2. To end operation*
*When the indoor unit only operation is ended, ensure to check over the settings after outdoor unit is properly connected and ready for use.
Note:
1. Prolonged running of this mode of operation may affect the life of the booster heater.
2. When the indoor unit only operation is engaged, if the Water circulation pump 1 is set on low speed, DHW supply temperature may become higher
than the desired water temperature set on the main controller.
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Zone1 1. Zone1 2-way valve 2a (local supply)
2. Zone2 2-way valve 2b (local supply)
3. Auto by-pass valve (local supply) *1
*1 For safety protection, it is recommended to install an auto by-pass
valve.
Note: Freeze stat function is deactivated whilst this control is ON.
Zone2
Therefore, ensure that anti-freeze solution is used to minimise
freezing risk. For anti-freeze instruction, see page 11.
Zone2
*3 *3
5
System Set Up

5.5 Remote Controller Options

The cylinder unit comes factory fitted with a main controller. This incorporates a thermistor for
temperature monitoring and a graphical user interface to enable set-up, view current status
and input scheduling functions. The main controller is also used for servicing purposes.
This facility is accessed via password protected service menus.
To provide the best efficiency Mitsubishi Electric recommends using automatic adaptation
function based on room temperature. To use this function a room thermistor needs to be
present in a main living area. This can be done in a number of ways the most convenient are
detailed below.
Refer to heating section of this manual for instructions on how to set compensation
curve, Flow temp. or Room temp. (Auto adaptation).
For instructions on how to set the thermistor input for the FTC please refer to Initial
settings section.
The factory setting for space heating mode is set to Room temp. (auto adaptation). If there
is no room sensor present in the system, this setting MUST be changed to either Compen-
sation curve mode or Flow temp. mode.
1-zone temperature control
Control option A
This option features the main controller and the Mitsubishi Electric wireless remote
controller. The wireless remote controller is used to monitor room temperature and
can be used to make changes to the space heating settings, boost DHW and switch
to holiday mode without having to directly use the main controller.
If more than one wireless remote controller is used, the most recently requested
temperature setting will commonly be applied to all rooms by the central control
system regardless of which wireless remote controller was used. No hierarchy exists
across these remote controllers.
Wire the wireless receiver to FTC by referring to the wireless remote controller
instruction manual. Turn DIP SW1-8 to ON. Before operation configure the wireless
remote controller to transmit and receive data by referring to the wireless remote
controller installation manual.
Control option B
This option features the main controller and the Mitsubishi Electric thermistor wired
to FTC. The thermistor is used to monitor room temperature but can not make any
changes in control operation. Any changes to DHW MUST be made using the main
controller mounted on the cylinder unit.
Wire the thermistor to the TH1 connector on FTC.
The number of room temperature thermistors that can be connected to FTC is
always one.
Control option C (Flow temp. or compensation curve only)
This option features the main controller and a locally supplied thermostat wired to
FTC.The thermostat is used to set the maximum temperature for heating room. Any
changes to DHW MUST be made using main controller mounted on the cylinder
unit.
The thermostat is wired to IN1 in TBI.1 on FTC. The number of thermostats that can
be connected to FTC is always one.
A single wireless remote controller may also be used as a thermostat (rather
than a room thermostat).
In such a case, the system would also necessitate wireless receiver on cylinder unit
to receive the remote controller's signal / feedback.
Note:
2-zone temperature control is not available.
2-zone valve on/off control is available.
Factory supplied standard
FTC
Outdoor unit
Cylinder unit
Wireless receiver Wireless remote controller
(option)
(option)
20.0°C
FTC
20.0°C
Max. 8
Outdoor unit
20.0°C
Main controller
20.0°C
Cylinder unit Room
FTC
Room temperature
thermistor (option)
Outdoor unit
Main controller
Cylinder unit Room
FTC
20.0°C
Room temperature
thermostat
Outdoor unit
(local supply)
Main controller
Cylinder unit Room
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