Installation
Liquid Line
If the system is congured with the InRak higher than the condenser unit it may be required to increase the degree of
sub cooling to prevent ashing gas occurring in the liquid line. This ashing is due to excess pressure drop caused by
the static head of liquid refrigerant and can result in poor operation of the evaporator and expansion device.
Careful pipe sizing is recommended to ensure that the liquid line does not have excessive pressure drop
Increasing the liquid line tube size can minimize pipe pressure drop.
However as a fail safe it is recommended that the condenser is installed above the indoor unit to allow for correct liquid
drain.
Pipe insulation
The liquid line of the system must be insulated if passing through extremely warm places (boiler houses etc). Ensuring
that the refrigerant does not become ash gas.
Refrigerant Charging Guide
The following information can be used to estimate the refrigerant quantity required in a typical split system installation.
Charging should be carried out with the compressors at 50% inverter speed (X1) or with a tandem compressor set (X2)
100% xed speed and 50% variable inverter compressor operation.
Unit Refrigerant Charge
(kg / Circuit)
The following table shows the refrigerant charge/circuit for the indoor and outdoor units based on nominal capacity
conditions.
Liquid Line Refrigerant
The following table shows the refrigerant charge/metre for the liquid line, using R410A and assuming a liquid line
temperature of 40°C.
Liquid Line (m)
kg/m
3/8”
0.05
1/2”
0.09
5/8”
0.15
3/4”
0.21
7/8”
0.30
1 1/8”
0.53
Indoor Unit
Outdoor Unit
InRak
kg/circuit Standard CR Match kg/circuit
LIR6042U-X250-0
4.2 CR80 8.4
LIR6042U-X240-0
4.2 CR65 9.8
LIR6042U-X130-0
3.8 CR50 4.9
LIR6042U-X123-0
3.8 CR50 4.9
LIR6042U-X130-1
3.8 CR50 4.9
LIR6042U-X123-1
3.8 CR50 4.9
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