Commissiong Operation; Preparation For Commissioning; Water System Commissioning; Leak Detection - Gree GMV-S120WL/A-S Service Manual

Function DIP switch S2 has 4 digits, which are "1", "2", "3" and "4", indicating "Gree water
tank", "floor heating", "solar power", "Self-made water tank" respectively. Each function can be set
according to this rule: Moving lever to "number" means "Connect" and moving lever to "ON"
means "Not connect". Digit "1" and "2" must be set based on actual engineering condition. Digit "3"
and "4" cannot be changed arbitrarily, otherwise unit will have temperature sensor malfunction or
fails to run.
Number of DIP switch
1
2
3
4
Example: S2 is as below:
Note: The black part indicates the lever.

4.1.2 Commissiong Operation

4.1.2.1 Preparation for Commissioning

(1) Check if unit is correctly installed.
(2) Check if the pipeline of water system and wires of electrical system are connected
properly.
(3) Check if the circulating water pipe adopts thermal insulation.
(4) Check if ground wire is connected.
(5) Check if the voltage is unit's rated voltage.
(6) Check if the check valves and relief valves of water inlet and water outlet are correctly
installed.
(7) Check if the pipeline of water system is evacuated and check if the air outlet valve and
blow down valve are closed.
(8) Water inlet pressure must be above 0.15MPa.
4.1.2.2 Water System Commissioning (Leak Detection and Evacuation)

4.1.2.2.1 Leak Detection

After the pipeline of water system is connected, perform leak detection. After confirming that
there is no leak, adopt thermal insulation to the pipeline of water system. Pay attention that the
valves and pipe joints also need thermal insulation. We recommend you to use thermal insulation
cotton that is more than 15mm's thick.
4.1.2.2.2 Water Filling and Air Discharge between Hydro Box and Water Tank and
Floor Heating Pipe
（1）Make sure that each pipe of water system is well connected. Close the air outlet valve
that connects with hydro box in exit pipe engineering construction and make sure that the blow
down valve is closed completely.
（2）Open the water replenishing valve and fill wter in. open the air outlet valve that is
connected in engineering construction.
（3） When there is water coming out from the air outlet valve, open the manual air outlet valve
A.
GMV5 Home DC Inverter Multi VRF Units
Meaning
Gree water tank
Floor heating
Solar power
Self-made water tank
203
DIP switch
Not connect Connect
ON OFF
ON OFF
ON OFF
ON OFF
Factory setting
OFF
OFF
ON
ON