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Refrigerant Charge Review
Weigh-in Method (use of electronic scale)
Weigh-in method can be used the initial installation or anytime a system charge is being replaced.
This method can also be used when power is not available at the site, or when operating conditions
(indoor/outdoor temperature) are not in range to verify with the sub-cooling charging method.
Note: Factory charge in the outdoor unit is sufficient for 15 feet of standard size interconnecting
New installations - Calculation of additional charge for a line that is longer than 15 feet
1. Total line length (feet) = __________ (a)
2. Standard line (feet) = ____15______ (b)
3. (a) less (b) = _____________ (c)
4. Refrigerant multiplier = 0.6 or 0.4 oz/ft (d)
5. Additional refrigerant (c*d) = ____________(e)*
*If the line is shorter than 15 feet, (e) = 0
Sealed system repairs - Charge calculation
1. Total line length (feet) = __________ (a)
2. Standard line (feet) = ____15______ (b)
3. (a) less (b) = _____________ (c)
4. Refrigerant multiplier = 0.6 or 0.4 oz/ft (d)
5. Additional refrigerant (c*d) = ____________(e)*
6. Factory charge (unit nameplate) = ________(f)
7. Total system charge (e+f) =
*If the line is shorter than 15 feet, (e) = 0
Note: The only approved mode to validate the system charge during cooling mode, is employing
MS-SVN052E-EN
A
Model
Factory charge
All models
(see data on nameplate)
liquid line.
the weigh-in charge. Outdoor temperature must be established to be between 55ºF and
120ºF with indoor temperature to be between 70ºF and 80ºF .
B
Charge multiplier for interconnecting
refrigerant tube length
Liquido 5/16" 0.4 oz/ft
System Operation
C
Liquid 3/8" 0.6 oz/ft
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