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II-PLACEMENT AND INSTALLATION
Make sure the unit is installed in accordance with the in-
stallation instructions and all applicable codes. See ac-
cessories section for conditions requiring use of the op-
III-CHARGING
A-Refrigerant Charge and Check
WARNING-Do not exceed nameplate charge under
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
at full load..
1 - Make sure outdoor coil is clean. Attach gauge
mode with economizer disabled until system
all outdoor air dampers are closed.
-
2 - Check each system separately with all stages
operating. Compare the normal operating pressures
to the pressures obtained from the gauges. Check
.
3 - Measure the outdoor ambient temperature and
the suction pressure. Refer to the charging curve to
determine a target liquid temperature
NOTE - Pressures are listed for sea level
applications.
4 - Use the same thermometer to accurately measure
the liquid temperature (in the outdoor section).
• 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.
measured liquid temperature agrees with the target
liquid temperature.
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