Let's take a look at the fan coil maintenance and operation

Author : sherry

Update time : 2020-11-10 14:12:38

Electrical maintenance operation: electrical maintenance inspection is divided into thermostat inspection and unit power supply inspection。
1. Inspection of temperature controller: turn on the power supply of the temperature controller and check whether the key on-off reaction is sensitive. If it is normal, the next step of inspection will be carried out. If there is any abnormality, check the reason:
(1) Whether the input voltage of power supply incoming line is normal:
a. If the input voltage is abnormal, check the superior line and return to normal;
b. Input voltage is normal, output voltage is normal, check the lower level circuit;
c. If the lower level line is abnormal, replace the line;
d. If the lower level circuit is normal, check the motor (use the multimeter or megger to check the phase to phase resistance or ground resistance value of the motor);
e. If the motor is abnormal, replace the motor;
f. If the motor is normal, there is a problem with the output voltage of the thermostat panel. Replace the panel.
(2) If the input voltage is normal and the output voltage is abnormal, replace the panel directly.
(3) Whether the refrigeration and heating modes are normal, the panel, circuit and motor shall be confirmed according to the above inspection methods. After the problem is solved, check whether the wiring terminals are loose or discolored. If there is any abnormality, the terminal block shall be replaced.
2. Unit power supply inspection: check whether the terminal block is loose and discolored. If there is abnormal locking terminal or replace the terminal block.
Water filter maintenance operation:
1.Close the chilled (hot) water inlet and outlet valve of fan coil unit. Open the exhaust valve of fan coil unit to drain water
a. The exhaust valve water, and from large to small to no water, indicating that the chilled (hot) water in and out of the valve is in good condition, and the second step can be continued;
b. If the exhaust valve does not water out, the exhaust valve may be blocked. Open the chilled (hot) water inlet valve and drain the dirt by flushing water;
c. Exhaust valve water constantly, it is possible that the valve is not closed tightly, tighten the chilled (hot) water inlet and outlet valve. After tightening the chilled (hot) water inlet and outlet valve, the water still keeps flowing, indicating that the valve is broken, and report to the supervisor.
2. Cut the insulation layer of the Y-type filter, open the screw cover of the Y-type filter, connect the water with the container, and take out the filter screen. Open the chilled (hot) water outlet valve, use the return water pressure to backwash the fouling of the cooling coil until the water is discharged, then close the outlet valve, install the cleaned filter screen and close the screw cover.
3. First, open the chilled (hot) water inlet valve to exhaust the exhaust valve until the exhaust valve has a long time of water, and then tighten the vent screw of the exhaust valve to open the chilled (hot) water outlet valve.
4. Check the connection points of each valve for leakage. a. If there is no leakage, immediately restore the insulation of Y-type filter; B. if there is leakage, repair or treat the leakage point. And restore the insulation layer of Y-type filter.
5. When the insulation is restored, the depression should be filled. Where there is air, condensation water forms.
6. After completion, check that the inlet and outlet valves must be open, and do not forget.

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