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Open the automatic exhaust valve first and close the valve at the inlet of the expansion tank. Connect the outlet of
the liquid filling pump to valve 1 and ensure that the water flows in the same directions for mounting check valve.
Connect the suction nozzle of the pump and water-return pipe to the liquid filling tank. Close valve 2 and open the
valve below the highest automatic exhaust valve on the array of the collector. Allow the liquid filling pump to fill
water into the system. Observe the water flowing back and close the water return valve 3 (marking it) when you
find that the returned water is clean and flows evenly, and there are no more bubbles. Pressurize it at the pressure
which is 1.5 times the pressure for opening the relief valve. Observe the connection points carefully to find out if
there is any leakage or oozing. It passes the test when there is no leakage or oozing, and the pressure drop is less
than 0.02MPa in 10 minutes.
Attention:
a. The test pressure is 1.5 times of the pressure for opening the relief valve;
b. Notice the relative positions of the relief valve and manometer.
3. Pipe cleaning:
Pipes shall be cleaned before and after testing the pressure of the system by flushing them and cleaning the filter.
Then drain the liquid from the pipe so as to fill antifreeze; if the liquid is not drained up from the system, you can
blow the liquid out with a blower; blow it until it is dried up.
4. Antifreeze filling:
The process for filling antifreeze is same as the above. The different work is that the valve connecting to the
expansion tank must be opened before filling the antifreeze; it should also be noticed that the pressure for filling
the liquid must be consistent to pre-filling pressure of the expansion tank, 0.15MPa to 0.2MPa in general;
5. Close valve 4 below the automatic exhaust valve when antifreeze is fully filled to prevent the medium
vaporizing when the system operates;
Requirements on maintenance and notices:
1. If it will stay idle for long time, cover the plate collector with a nontransparent object and disconnect it from the
power supply to prevent overheating of the collector.
2. Check the system regularly to find out if it operates properly; check the manometer to look at if the pressure
valve on it is normal; if the pressure value is under standard, check if there is any leakage on the pipes; if not,
antifreeze shall be refilled into the system.
3. If the system needs the antifreeze to be replaced, it shall be emptied first. The liquids in the pipes shall be
drained up so as to fill antifreeze into it. If liquid cannot be drained up from the system, dry it by blowing the
system with a blower; don't stop blowing until the system is completely dry （Attention, the replacement should be
assisted by the local after-service providers）.
4. Check the low temperature resistibility of the antifreeze regularly（For the detailed interval, consult the local
antifreeze supplier）.
5. Pull the lever of the relief valve monthly to flush the valve seat and valve clack; keep dirt and scaling off its
sealing surface since they would cause leakage or Open/Close failing. Check if the valve can be opened or closed
normally.
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