Charging - Lennox KCC Series Unit Information

REFRIGERANT STAGES - 092, 102, 120, 150
CONDENSER COIL
KG/KC 092, 102 - Stage 1
KG/KC 120, 150 - Stage 2
CONDENSER COIL
KG/KC 092, 102 - Stage 2
KG/KC 120, 150 - Stage 1
EVAPORATOR
COIL STAGE 2
2
1
FIGURE 14
REFRIGERANT STAGES - 150
TUBE/FIN OD COIL
CONDENSER COIL
STAGES 1 & 2
EVAPORATOR
COIL STAGE 2
2
1
FIGURE 15
C-Safety or Emergency Shutdown
Turn off power to unit.
(BOTH FANS ARE ENERGIZED
WITH A Y1 DEMAND)
EVAPORATOR
COIL STAGE 1
(BOTH FANS ARE ENERGIZED
WITH A Y1 DEMAND)
EVAPORATOR
COIL STAGE 1
IV-CHARGING
A-All Aluminum Outdoor Coil
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.
WARNING - Do not exceed nameplate charge under
any condition.
This unit is factory charged and should require no further
adjustment. If the system requires additional refrigerant,
reclaim the charge, evacuate the system, and add required
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.
If weighing facilities are not available, or to check the
charge, use the following procedure:
IMPORTANT - Charge unit in standard cooling mode.
1 - Make sure outdoor coil is clean. Attach gauge
manifolds and operate unit at full CFM in cooling
mode with economizer disabled until system
stabilizes (approximately five minutes). Make sure
all outdoor air dampers are closed.
2 - Check each system separately with all stages
operating. Compare the normal operating pressures
(TABLE 6 to TABLE 9) to the pressures obtained
from the gauges. Check unit components if there
are significant differences.
3 - Measure the outdoor ambient temperature and
the suction pressure. Refer to the appropriate
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
the liquid temperature (in the outdoor section).
• If measured liquid temperature is higher than the
target liquid temperature, add refrigerant to the
system.
• If measured liquid temperature is lower than the
target liquid temperature, recover some refriger-
ant from the system.
5 - 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
temperature. Do not go below the target liquid
temperature when adjusting charge. Note that
suction pressure can change as charge is adjusted.
7 - Example KG/KC 092S Circuit 1: At 95°F outdoor
ambient and a measured suction pressure of
130psig, the target liquid temperature is 94.4°F. For
a measured liquid temperature of 112°F, add charge
in increments until measured liquid temperature
agrees with the target liquid temperature.
Page 28
WARNING
agrees with the target liquid