Page 19
FIGURE 17
REFRIGERANT STAGES - 092, 102, 120
1
2
(BOTH FANS ARE ENERGIZED
WITH A Y1 DEMAND)
CONDENSER COIL
KG/KC 092 - Stage 2
KG/KC 102, 120 - Stage 1
EVAPORATOR
COIL STAGE 1
CONDENSER COIL
KG/KC 092 - Stage 1
KG/KC 102, 120 - Stage 2
EVAPORATOR
COIL STAGE 2
FIGURE 18
REFRIGERANT STAGES - 150
1
2
(Y1 ENERGIZES FAN 1 AND COMPRESSOR 1;
Y2 ENERGIZES FAN 2 AND COMPRESSOR 2)
EVAPORATOR
COIL STAGE 1
EVAPORATOR
COIL STAGE 2
CONDENSER
COIL STAGE 1
CONDENSER
COIL STAGE 2
CONDENSER
FAN STAGE 1
CONDENSER
FAN STAGE 2
B4
B5
2- Check each system separately with all stages
operating. Compare the normal operating pressures
(see tables 4 - 11) 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
refrigerant 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 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- Example KG/KC 092S Circuit 1: At 95°F outdoor
ambient and a measured suction pressure of
130psig, the target liquid temperature is 101°F. For a
measured liquid temperature of 112°F, add charge in
increments until measured liquid temperature agrees
with the target liquid temperature.
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