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. = DF10X-EZRE
Outdoor Unit Model Ref = CR16 Condenser
Interconnecting Pipework = 10 metres
From the Refrigerant Pipe Sizing Guide, the
liquid line size given for pipework length of 10
metres is:0.05kg/m
SR = LR + IR + OR
Where:
LR = L x m
LR = 0.5 kg. (As calculated from above)
IR = 1.0 kg
OR = 2.7 kg
SR = 0.5 + 1.0 + 2.7
Therefore
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 = 0.05 kg/m (Liquid
Line Size = 3/8”)
LR = 10 x 0.05 = 0.5kg
System Refrigerant Charge
System Refrigerant
Charge
= 4.2 kg / Circuit
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