LG ARUN50GS2A Quick Manual page 18

18
WARNING
!
• If the primary charging is not performed after vacuum, wet air
may go into the outdoor unit. If air is mixed with the refrigerant,
the refrigerant cycle may malfunction and the unit may be dam-
aged.
• Charging of refrigerant while the compressor is working is pro-
hibited. Otherwise, liquid may go into the compressor. It may
cause faults of the compressor.
• Use a gravimeter accurate to 0.1kg.
• If other refrigerants are mixed in the original refrigerant, a refrig-
erant cycle may cause malfunction or damage.
• Add accurate refrigerant quantity via calculation.
Too much or too little refrigerant may cause problems
• Repeated on and off of the indoor units without charging refrig-
erant may cause faults of EEV.
• Since R410A is a mixed refrigerant, the required additional refrig-
erant must be charged in its liquid state. If the refrigerant is
charged in its gaseous state, its composition changes and the
system will not work properly.
Refrigerant charging
Follow following procedure to charge the refrigerant.
- Open all service valves
- Run the unit with cooling mode
- Charging the refrigerant to gas service valve during operation.
Open
Refrigerant
cylinder
CAUTION
!
Never charge the refrigerant with service valves closed and unit
stopped.
If charging is carried out with service valves closed and unit
stopped, the compressor will be damaged. When unit starts to
run, and the unit will display ch26 error.
If trying to keep running under this condition, compressor will be
broken.
Thermal insulation of refrigerant piping
Be sure to give insulation work to refrigerant piping by covering liquid
pipe and gas pipe separately with enough thickness heat-resistant poly-
ethylene, so that no gap is observed in the joint between indoor unit
and insulating material, and insulating materials themselves. When in-
sulation work is insufficient, there is a possibility of condensation drip,
etc. Pay special attention to insulation work to ceiling plenum.
Ⓐ Heat insulation material
Ⓑ Pipe
Ⓒ Outer covering(Wind the connection part and cutting part of heat in-
sulation material with a finishing tape.)
When using polyethylene cover as covering material, asphalt roof-
ing shall not be required.
• Do not insulate gas or low pressure pipe and liquid or highpres-
Charging during
Open
cooling operation
Heat insulation
material
Outer
covering
NOTE
!
Bad example
sure pipe together.
A
C
D
E
• Be sure to fully insulate connecting portion.
A
Ⓐ These parts are not insulated.
Good example
C
Power lines Communication lines
D
D
A
B
E
Separation
Adhesive + Heat - resistant poly-
ethylene foam + Adhesive tape
Indoor Vinyl tape
Floor ex- Water-proof hemp cloth +
posed Bronze asphalt
Water-proof hemp cloth +
Outdoor
Zinc plate + Oily paint
Ⓐ Liquid pipe
Ⓑ Gas pipe
ⓒ Power lines
ⓓ Finishing tape
ⓔ Insulating material
ⓕ Communication lines
Ⓐ Liquid pipe
Ⓑ Gas pipe
ⓒ Power lines
ⓓ Insulating material
ⓔ Communication lines