Mark HCNI 533, Техническое руководство

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5.2 Refrigerant recharge
Adding the refrigerant if the piping length exceeds the chargeless pipe length:
[3]-3
Electronic scale
(Indoor unit)
(Liquid side)
(Gas side)
Charging cylinder
Check valve
OPEN CLOSE
2-way valve
Open
3-way valve
Open
(Outdoor unit)
Lo Hi
Procedure:
1. Close both 2-way and 3-way valves.
2. Slightly connect the Handle “Lo” charge hose to the 3-way service port.
3. Connect the charge hose to the valve at the bottom of the cylinder.
4. As the refrigerant is R32, invert the cylinder to ensure a complete liquid charge.
5. Open the valve at the bottom of the cylinder for 5 seconds to purge the air in the charge hose,
then fully tighten the charge hose with push pin Handle “Lo” to the service port of 3-way valve.
6. Place the charging cylinder onto an electronic scale and record the starting weight.
7. Fully open the Handle “Lo” manifold valve, 2-way and 3-way valves.
8. Operate the air conditioner in cooling mode to charge the system with liquid refrigerant.
9. When the electronic scale displays the correct weight (refer to the gauge and the pressure
of the low side to confirm, the value of pressure refers to the Appendix, turn off the air
conditioner, then disconnect the charge hose from the 3-way service port immediately.
10. Mount the caps of service port and 2-way and 3-way valves.
11. Use a torque wrench to tighten the caps to a torque of 18 N•m.
12. Check for gas leakage.