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Injecting Water to Expel Gas
Prerequisites
- Nitrogen must be expelled before injecting water.
- To avoid blockage of the heat exchanger in the smart cooling product due to foreign matter from the main pipe during the construction, you are advised to clean the main pipe before water is supplied to the smart cooling product. Turn off the isolation valves on the water inlet and outlet pipes before the cleaning and turn them on afterwards.
The water supply quality shall meet the requirements in Table 4-4.
Table 4-4 Water quality requirements
Check Item |
Unit |
Makeup Water |
Circulating Water |
|---|---|---|---|
pH (25°C) |
- |
7.5–9.5 |
7.5–10.0 |
Turbidity |
NTU |
≤ 5 |
≤ 10 |
Conductivity (25°C) |
µs/cm |
≤ 600 |
≤ 2000 |
CI |
mg/L |
≤ 250 |
≤ 250 |
Total Fe |
mg/L |
≤ 0.3 |
≤ 1.0 |
Calcium hardness (in CaCO3) |
mg/L |
≤ 300 |
≤ 300 |
Total alkalinity (in CaCO3) |
mg/L |
≤ 200 |
≤ 500 |
Dissolved oxygen |
mg/L |
- |
≤ 0.1 |
Organic phosphorus (in P) |
mg/L |
- |
≤ 0.5 |
Procedure
- Open the main water inlet valve of the unit.
- Ensure that the needle valve and exhaust valve on the pipe are closed and the chilled water valve is in the 100% state.
- Gradually open the exhaust valve, as shown in Checking the Nitrogen Pressure. Gas and chilled water flow out of the exhaust hose together.
- Adjust the exhausting speed until no bubble flows out of the hose.
- After gas is expelled, manually turn the chilled water valve to the 0 state.
- Close the exhaust valve.