Installation
Calculation of System Refrigerant Charge (kg)
The system refrigerant charge can be calculated using the following equation:
SR = LR + IR + OR
Where:
SR = Total System Refrigerant Charge (kg)
LR = Total Liquid Line Refrigerant Charge. (As calculated from above)
IR = Indoor Unit Refrigerant Charge.
OR = Outdoor Unit Refrigerant Charge.
Example
Indoor Unit Model Ref. = LIR6042U-X250-0
Outdoor Unit Model Ref = CR80 Condenser
Interconnecting Pipework = 10 metres
From the Refrigerant Pipe Sizing Guide, the
liquid line size given for pipework length of 10
metres is:0.15kg/m
SR = LR + IR + OR
LR = L x m
Where:
LR = 1.5 kg. (As calculated from above)
IR = 4.2 kg
OR = 8.4 kg
Calculation of Liquid Line Refrigerant Charge (kg)
The liquid line refrigerant charge can be calculated using the following equation:
LR = L x m
Where:
LR = Total Liquid Line Refrigerant charge (kg)
L = Length of Interconnecting pipework (metres)
m = Liquid Line Refrigerant charge / metre. Refer to Liquid Line
Refrigerant Charge (kg/m), above.
Where:
L = 10 metres
m = 0.15 kg/m (Liquid
Line Size = 5/8”)
LR = 10 x 0.15 = 1.5kg
System Refrigerant Charge
SR = 1.5 + 4.2 + 8.4
Therefore System
Refrigerant Charge
= 4.2 kg / Circuit
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