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

5
System Set Up
Outputs
Name Terminal block Connector Item
OUT3 TBO.1.1-2 — 2-way valve 2b output *1
OUT13 TBO.1.3-4 — 2-way valve 2a output *1
*1 For 2-zone valve ON/OFF control.
N L N L
1 2 3 4
TBO.1
OUT3 OUT13
How to use TBO.1
Wiring specifi cation and local supply parts
Item Name Model and specifi cations
External output function Outputs wire Use sheathed vinyl coated cord or cable.
Max. 30 m
Wire type: CV, CVS or equivalent
Wire size: Stranded wire 0.25 mm
Solid wire: ø0.57 mm² to ø1.2 mm
Tool
Tool
Conductor
Conductor
Outline view Top view
Connect them using either way as shown above.
<Figure 5.2.2>
Note:
*1. Stranded wire should be processed with insulation-covered bar terminal
(DIN46228-4 standard compatible type).
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OFF ON Signal/Max current Max. total current
OFF ON 230V AC 0.1A Max.
0.2A
OFF ON 230V AC 0.1A Max.
2 to 1.5 mm 2
2
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
Zone1
1
3
Zone2
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
● Wireless remote controller (option)
Room temp. control
● Room temperature thermistor (option)
(Auto adaptation) *2
● Wireless remote controller (option) *3
Compensation curve or fl ow temp. control
● Room temperature thermostat (local supply)
*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
● Check if the indoor unit power supply is OFF, and turn DIP switch 4-4 and 4-5 ON.
● Turn ON the indoor unit power supply.
2. To end operation*
● Turn OFF the indoor unit power supply.
● Turn DIP switch 4-4 and 4-5 OFF.
* 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.
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.
Therefore, ensure that anti-freeze solution is used to minimise
freezing risk. For anti-freeze instruction, see page 13.
Zone2
● Wireless remote controller (option)
● Wireless remote controller (option) *3
● Room temperature thermostat (local supply)
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