LG Multi V PRHR033 Installation Manual page 24

24
Level
Toward indoor unit
- Apply Oil Trap as shown below when the length of the pipe between
the outdoor units is more than 2 m [6.6 ft]. Otherwise, the unit may
not operate properly.
(Example 1)
≤ 2 m [6.6 ft]
Toward indoor unit
(Example 2)
≤ 2 m [6.6 ft]
Toward indoor unit
≥ 2 m [6.6 ft]
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.
=
Additional charge(kg) Total liquid pipe : Ø 25.4 mm (1.0 inch)
+
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)
Include only for +
Number of installed HR units
Heat Recovery
system
CF value of indoor unit
Amount refrigerant of Indoor units
Example) 4Way Ceiling Cassette 14.5 kW -1 ea, Ceiling concealed
Duct 7.3 kW-2 ea,
Wall Mounted 2.3 kW-4 ea
CF = 0.64 × 1 + 0.26 × 2 + 0.24 × 4 = 2.12 kg (4.67 lbs)
Level
Oil Trap
Toward indoor unit
Oil Trap
x 0.480 kg/m (0.323 (lbs/ft))
x 0.354 kg/m (0.238 (lbs/ft))
x 0.266 kg/m (0.179 (lbs/ft))
x 0.173 kg/m (0.116 (lbs/ft))
x 0.118 kg/m (0.079 (lbs/ft))
x 0.061 kg/m (0.041 (lbs/ft))
x 0.022 kg/m (0.015 (lbs/ft))
× 0.5 kg (1.1 lbs)
h 6 & 8 Branches
Model : 1.0 kg/EA
(2.2 lbs/EA)
Attach the additional refrigerant table of IDU.
WARNING
!
• Regulation for refrigerant leakage
: the amount of refrigerant leakage should satisfy the following
equation for human safety.
Total amount of refrigerant in the system
Volume of the room at which Indoor Unit of
the least capacity is installed
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 (6.56 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
Refrigerant charging
For Heat Recovery System Installation
Ⓐ Manifold Gauge
Ⓑ Low pressure side Handle
Ⓒ High pressure side Handle
Liquid pipe
Low Pressure Gas pipe
High Pressure Gas pipe
≤ 0.44 (kg/m
3
)
3
(0.028 (lbs/ft ))