Heat Pump
Unitherm 3 R32
27
N(1)
2 3
NO valve
N
2-Way
valve 1
XT2
N(1)
2 3
NC valve
N
2-Way
valve 1
XT2
N(1)
2 3
L2(ON)
2-Way
valve 1
N
L1
(OFF
)
XT2
WARNING
•
Normal Open type should be connected to wire (OFF) and wire (N) for valve closing in cooling mode.
•
Normal Closed type should be connected to wire (ON) and wire (N) for valve closing in cooling mode.
(ON) : Line signal (for Normal Open type) from PCB to 2-way valve
(OFF) : Line signal (for Normal Closed type) from PCB to 2-way valve
(N) : Neutral signal from PCB to 2-way valve
12. 3-Way Valve
The 3-way valve 2 is required for the sanitary water tank. Its role is flow switching between the under floor
heating loop and the water tank heating loop.
General Information
Type
Power
Operating Mode
Supported
SPDT
3-wire
230V 50Hz ~AC
Selecting “Flow A” between “Flow A” and “Flow B”
Yes
Selecting “Flow B” between “Flow B” and “Flow A”
Yes
(1) SPDT = Single Pole Double Throw. Three wires consist of Live1 (for selecting Flow B), and Neutral (for
common).
(2)
Flow A means 'water flow from the indoor unit to under floor water circuit'.
(3)
Flow B means 'water flow from the indoor unit to sanitary water tank'.
Follow steps below to wire the 3-way valve:
Follow below procedures Step 1 ~ Step 2.
Step 1. Uncover front cover of the unit and open the control box.
Step 2. Find terminal block and connect wires as below.
BN(7)
BK(6)
XT1
X34
AP1
YV1
BU(8)
WARNING
•
The 3-way valve should select water tank loop when electric power is supplied to wire (OFF) and wire (N).
• The 3-way valve should select under floor loop when electric power is supplied to wire (ON) and wire (N).
•
(ON): Line signal (Water tank heating) from the main board to the 3-way valve
• (OFF): Line signal (Under floor heating) from the main board to the 3-way valve
•
(N): Neutral signal from the main board to the 3-way valve
13. Other Auxiliary Heat Sources
Other thermal is allowed for the equipment and controlled in such a way that the mainboard will output 230V
when outdoor temperature is lower than the set point for startup of the aother thermaluxiliary heat source.
Note: Other thermal and Optional Electric Heater CANNOT be installed at the same time.
L
N
