Test Operation & Troubleshooting & Maintenance
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It is used to keep stable pressure of the water system. The
tank is charged with a certain volume of nitrogen which is
separated from the water side with a gasbag. When pressure of
the water side exceeds the nitrogen pressure, the gasbag will
expand and water enters into the tank so as to lower the
pressure of the water system. In contract, when pressure of the
water system goes down, nitrogen in the tank will expel water
out to the water system.
It is used to prevent the heat exchanger from being frozen
owing to reduced water flow rate. When the flow rate goes down
to the point at which the flow switch will act, the switch will trip
off and the unit will raise an alarm and shut down.
It is used to prevent the pressure of circulation water from
increasing unusually. When the pressure is larger than the set
point (0.6MPa), this valve will open to relieve water pressure.
It is used to expel air trapped inside the water system to
make sure normal operation of the system. It is usually installed
at the highest point of the system.
5.3.2 Charging and Discharging of Refrigerant
(1)
Before shipped out from manufacturer, the outdoor unit has been filled with refrigerant. Additional
refrigerant may be filled when carrying out site connection of pipelines.
(2) Check the liquid valve and the gas valve of the outdoor unit. The valves shall be completely shut
off.
(3) Connect a vacuum pump to the liquid valve and the gas valve of the outdoor unit to remove air
from the inside of the indoor unit and the connecting pipe. Refer to the following figure:
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