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WHEN TO CHARGE?
Warm weather best
Can charge in colder weather
CHARGE METHOD? Determine by:
Metering device type
Outdoor ambient temperature
REQUIREMENTS:
Sufficient heat load in structure
Indoor temperature between 70-80ºF
(21−26ºC)
Manifold gauge set connected to unit
Thermometers:
− to measure outdoor ambient temperature
− to measure liquid line temperature
− to measure suction line temperature
TXV
FIXED
ORIFICE
APPROACH OR
SUBCOOLING
WEIGH-IN
SUPERHEAT
START: Determine how refrigerant is metered
39ºF
(3.8ºC) and
Below
Which indoor
metering
device?
WEIGH-IN
64ºF
(17.7ºC) and
Below
40ºF
(4.4ºC) and
Above
DETERMINING CHARGE METHOD
65ºF
(18.3ºC) and
Above
Figure 19. Determining Charge Method
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