Page 28
REFRIGERANT STAGES - 092, 102, 120, 150
1
2
(BOTH FANS ARE ENERGIZED
WITH A Y1 DEMAND)
CONDENSER COIL
KG/KC 092, 102 - Stage 2
KG/KC 120, 150 - Stage 1
EVAPORATOR
COIL STAGE 1
CONDENSER COIL
KG/KC 092, 102 - Stage 1
KG/KC 120, 150 - Stage 2
EVAPORATOR
COIL STAGE 2
FIGURE 14
REFRIGERANT STAGES - 150
TUBE/FIN OD COIL
1
2
(BOTH FANS ARE ENERGIZED
WITH A Y1 DEMAND)
CONDENSER COIL
STAGES 1 & 2
EVAPORATOR
COIL STAGE 1
EVAPORATOR
COIL STAGE 2
FIGURE 15
C-Safety or Emergency Shutdown
IV-CHARGING
A-All Aluminum Outdoor Coil
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.
any condition.
reclaim the chargeevacuate the systemadd 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.
IMPORTANT - Charge unit in standard cooling mode.
Make sure outdoor coil is clean. Attach gauge
mode with economizer disabled until system
all outdoor air dampers are closed.
Check each system separately with all stages
operating. Compare the normal operating pressures
Measure the outdoor ambient temperature and
circuit charging curve to determine a target liquid
temperature.
NOTE - Pressures are listed for sea level
applications.
Use the same thermometer to accurately measure
•
system.
•
Add or remove charge in increments. Allow the
or removed.
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.
in increments until measured liquid temperature
agrees with the target liquid temperature.
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