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IV-CHARGING
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in personal
injury or death.
REFRIGERANT CHARGE AND CHECK
any condition.
This unit is factory charged and should require no further
-
quired nameplate charge.
NOTE - System charging is not recommended below 60°F
(15°C). In temperatures below 60°F (15°C), the charge
must be weighed into the system.
IMPORTANT - Charge unit in standard cooling mode.
1 - Make sure outdoor coil is clean. Attach gauge
tubing routed outside of unit near bottom corner of
with economizer disabled until system stabilizes
air dampers are closed.
2 - Check each system separately with all stages
operating. Compare the normal operating pressures
the gauges. Check unit components if there are
3 - Measure the outdoor ambient temperature and
circuit charging curve to determine a target liquid
temperature.
Note - Pressures are listed for sea level applications.
4 - Use the same thermometer to accurately measure
• If measured liquid temperature is higher than the
-
tem.
• If measured liquid temperature is lower than the
from the system.
Add or remove charge in increments. Allow the
system to stabilize each time refrigerant is added
or removed.
6 - Continue the process until measured liquid
temperature agrees with the target liquid
temperature. Do not go below the target liquid
temperature when adjusting charge. Note that
suction pressure can change as charge is adjusted.
7 -
in increments until measured liquid temperature
agrees with the target liquid temperature.
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