York YUHC 18, Service Manual, Page: 37 / 49

(4) Additional charge
When the length of the one-way pipe is less than 5m, additional refrigerant charge after vacuuming is not
necessary.
When the length of one-way pipe is over 5m, the quantity to be added is as follows (unit in gram):
Connective pipe length Air purging method Additional amount of refrigerant to be charged
Less than 5m Use refrigerant of outdoor unit
Over 5m Use vacuum pump or refrigerant
cylinder
30g(length-5m) (capacity
≤
20000btu/h.)
65g(length-5m) (capacity
≥
24000btu/h.)
3. Connect the drain pipe
4. Wiring
Please refer to the Wiring Diagram.
5. Test operation
(1) The test operation must be carried out after the entire installation has been completed.
(2) Please confirm the following points before the test operation.
The indoor unit and outdoor unit are installed properly.
Tubing and wiring are correctly completed.
The refrigerant pipe system is leakage-checked.
The drainage is unimpeded.
The ground wiring is connected correctly.
The length of the tubing and the added stow capacity of the refrigerant have been recorded.
The power voltage fits the rated voltage of the air conditioner.
There is no obstacle at the outlet and inlet of the outdoor and indoor units.
The gas-side and liquid-side stop values are both opened.
The air conditioner is pre-heated by turning on the power.
(3) According to the user's requirement, install the remote controller when the remote controller's signal can reach
the indoor unit smoothly.
(4) Test operation
Indoor unit
Whether the switch on the remote controller works well.
Whether the buttons on the remote controller works well.
Whether the air flow louver moves normally.
Whether the room temperature is adjusted well.
Whether the indicator lights normally.
Whether the drainage is normal.
Whether there is vibration or abnormal noise during operation.
Outdoor unit
Whether there is vibration or abnormal noise during operation.
Whether the generated wind, noise, or condensed of by the air conditioner have influenced your neighborhood.
Whether any of the refrigerant is leaked.