Johnson SUIT Serie Manual De Instrucciones página 29

2-1 Arrival of goods and unpacking inspection
1) When the machine is received, check if there is any damage in transportation. If any
surface or internal damage is found, please inform the transportation agency in a written form.
2) After the machine is received, check if the device type, specification and quantity are
complying with the contract.
3) When unpacking the product, please well keep the instruction manual and check all
accessories.
2-2 Refrigerant pipe
1) The refrigerant pipe installation must be performed by the special refrigerant dispenser (separately
ordered) for the central air conditioner.
2) The refrigerant pipe must be of the specified pipe diameter and pipe wall thickness.
3) Copper pipe welding must be performed with nitrogen filled protection, and the pipe must
be filled with nitrogen gas of 0.2kgf/cm² which cannot be cut off until welding is completed and the
copper pipe is thoroughly cooled down.
4) The refrigerant pipe must be treated with thermal insulation.
5) After the refrigerant pipe is installed and before gas tightness test and vacuumization, the
indoor unit cannot be electrified.
2-3 Air tightness test
After the refrigerant pipe is installed, nitrogen gas of 40kgf/cm² (4.0MPa) must be filled from
the gas side and liquid side at the same time for 24 hour gas tightness test.
2-4 Vacuumizations
After the gas tightness test, vacuumization (vacuum degree -0.1MPa) must be performed from
both the gas side and the liquid side at the same time.
2-5 Refrigerant refilling
1) The volume of refrigerant to be refilled is calculated on the diameter and length (actual
length) of the pipes at the outdoor unit and indoor unit liquid side.
2) The volume of refrigerant to be refilled, liquid pipe diameter, pipe length and height
difference between the outdoor unit and indoor unit shall be recorded on the confirmation table (on
the cover of the electrical box) for future reference.
2-6 Electrical wiring
1) The selection of power supply capacity and wire diameter shall be complying with the
design manual. The diameter of power supply cable for an air conditioner is usually larger than the
diameter of motor cable.
2) To prevent any disoperation of the air conditioner, the power supply cable (220～240V/ 380～415V
3N) cannot be twisted with any connecting cable of outdoor unit and indoor unit (low voltage cable).
3) The indoor unit can be electrified after gas tightness test and vacuumization.
2-7 Trial running
1) Trial running cannot be started unless the outdoor unit is electrified and preheated for more than
12h, or the system may be damaged.
2.Key points in installation inspection
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