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ENGLISH
The amount of Refrigerant
The calculation of the additional charge should take into account the
length of pipe and CF(correction Factor) value of indoor unit.
Total liquid pipe : Ø 25.4 mm (1.0 inch)
Additional charge(kg)
Total liquid pipe : Ø 22.2 mm (7/8 inch)
Total liquid pipe : Ø 19.05 mm (3/4 inch)
Total liquid pipe : Ø 15.88 mm (5/8 inch)
Total liquid pipe : Ø 12.7 mm (1/2 inch)
Total liquid pipe : Ø 9.52 mm (3/8 inch)
Total liquid pipe : Ø 6.35 mm (1/4 inch)
CF value of indoor unit
=
+
+
+
+
+
+
× 0.480 kg/m (0.323 lbs/ft)
× 0.354 kg/m (0.238 lbs/ft)
× 0.266 kg/m (0.179 lbs/ft)
× 0.173 kg/m (0.116 lbs/ft)
× 0.118 kg/m (0.079 lbs/ft)
× 0.061 kg/m (0.041 lbs/ft)
× 0.022 kg/m (0.015 lbs/ft)
Amount refrigerant of Indoor units
Example) 4 Way Ceiling Cassette 14.5 kW -1ea, Ceiling concealed
Duct 7.3 kW-2 ea,
Wall Mounted 2.3 kW-4 ea
CF = [0.64 kg (1.411 lbs)×1 EA] + [0.26 kg (0.573 lbs)×2
EA] + [0.26 kg (0.529 lbs)×4 EA]
= 2.12 kg (4.67 lbs)
• Regulation for refrigerant leakage
: the amount of refrigerant leakage should satisfy the following
equation for human safety.
If the above equation can not be satisfied, then follow the
following steps.
• Selection of air conditioning system: select one of the next
- Installation of effective opening part
- Reconfirmation of Outdoor Unit capacity and piping length
- Reduction of the amount of refrigerant
- Installation of 2 or more security device (alarm for gas leakage)
• Change Indoor Unit type
: installation position should be over 2 m (6.6 ft) from the floor (Wall
mounted type
’
Cassette type)
• Adoption of ventilation system
: choose ordinary ventilation system or building ventilation
system
• Limitation in piping work
: Prepare for earthquake and thermal stress
Volume of the room at which Indoor Unit of
the least capacity is installed
Total amount of refrigerant in the system
≤
0.44 kg/m
3
(0.028 lbs/ft
3
)
Attach the additional refrigerant table of IDU.
Bad example
• Do not insulate gas or low pressure pipe and liquid or
highpressure pipe together.
• Be sure to fully insulate connecting portion.
Ⓐ
These parts are not insulated.
Ⓐ
Liquid pipe
Ⓑ
Gas pipe
ⓒ
Power lines
ⓓ
Finishing tape
ⓔ
Insulating material
ⓕ
Communication lines
A
C
D
E
B
F
A
Be sure to give insulation work to refrigerant piping by covering liquid
pipe and gas pipe separately with enough thickness heat-resistant
polyethylene, so that no gap is observed in the joint between indoor
unit and insulating material, and insulating materials themselves. When
insulation 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
insulation material with a finishing tape.)
Heat insulation
material
Ad Heat - resistant
polyethylene foam + Adhesive tape
Outer
covering
Indoor
Vinyl tape
Floor
exposed
Water-proof hemp cloth +
Bronze asphalt
Outdoor
Water-proof hemp cloth +
Zinc plate + Oily paint
NOTE
!
When using polyethylene cover as covering material, asphalt
roofing shall not be required.
Thermal insulation of refrigerant piping
Good example
Ⓐ
Liquid pipe
Ⓑ
Gas pipe
ⓒ
Power lines
ⓓ
Insulating material
ⓔ
Communication lines
Communication lines
Separation
Power lines
E
D
D
B
A
C
WARNING
!
1,MFL67221443,영영 19. 1. 31. 영영 11:48 Page 20