Lennox Elite XC14−018−230 Installation Instructions Manual page 24

DETERMINING CHARGE METHOD
START: Determine how refrigerant is metered
WHEN TO CHARGE?
S
Warm weather best
S
Can charge in colder weather
CHARGE METHOD? Determine by:
S
Metering device type
S
Outdoor ambient temperature
REQUIREMENTS:
S
Sufficient heat load in structure
S
Indoor temperature between 70-80ºF
(21−26ºC)
S
Manifold gauge set connected to unit
S
Thermometers:
− to measure outdoor ambient temperature
− to measure liquid line temperature
− to measure suction line temperature
506636−01
TXV
64ºF
(18.3ºC) and
(17.7ºC) and
Above
Below
APPROACH OR
WEIGH-IN
SUBCOOLING
Figure 19. Determining Charge Method
Page 24
Which indoor
metering
device?
40ºF
65ºF
(4.4ºC) and
Above
SUPERHEAT
FIXED
ORIFICE
39ºF
(3.8ºC) and
Below
WEIGH-IN