Way Valve; Other Auxiliary Heat Sources - Gree Versati III GRS-CQ4.0Pd/NhG-K Owner's Manual

Air-to-water Heat Pump
• Normal Open type should be connected to wire (ON) and wire (N) for valve closing in cooling mode.
• Normal Closed type should be connected to wire (OFF) 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

11. 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
SPDT
230V 50Hz ~AC
3-wire
(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.
• 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

12. Other Auxiliary Heat Sources

Other auxiliary heat sources are 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 auxiliary heat source.
3
2-Way Valve 1
WARNING
Power
Selecting "Flow A" between "Flow A" and "Flow B"
Selecting "Flow B" between "Flow B" and "Flow A"
9
3-Way Valve 2
WARNING
4 5
Operating Mode
10 11
22
SPLIT TYPE
Supported
Yes
Yes