AAON LC-054 - Manual (Page 18)

18
Condenser Flooding
In order to maintain head pressure in the
refrigeration system, liquid refrigerant is
kept in the condenser to reduce condenser
surface. The following chart shows the
percentage that a condenser must be flooded
in order to function properly at the given
ambient temperature.
Table 1 - Condenser Flooding
PERCENTAGE OF CONDENSER TO BE
FLOODED
Ambient
Temperature
( ° F)
Evaporating Temperature ( ° F)
0 ° 10 ° 20 ° 30 ° 35 ° 40 ° 45 ° 50 °
70
° 40 24 0 0 0 0 0 0
60 ° 60 47 33 17 26 20 10 4
50 ° 70 60 50 38 45 40 33 28
40 ° 76 68 60 50 56 52 46 42
30 ° 80 73 66 59 64 60 55 51
20 ° 86 77 72 65 69 66 62 59
0 ° 87 83 78 73 76 73 70 68
During higher ambient temperatures the
entire condenser is required to condense
refrigerant. During these higher ambient
temperatures, a receiver tank is used to
contain the refrigerant that was required to
flood the condenser during low ambient
operation. The receiver must be sized to
contain all of the flooded volume otherwise
there will be high head pressures during
higher ambient conditions.
Electrical
The single point electrical power
connections are made in the electrical
control compartment. The microprocessor
control furnished with the unit is supplied
with its own power supply factory wired to
the main power of the chiller.
Check the unit nameplate voltage to make
sure it agrees with the power supply.
Connect power to the unit according to the
wiring diagram provided with the unit.
Note: Units are factory wired for 208V,
230V, 460V, or 575V. In some units, the
208V and 230V options may also be
provided in single or three phase
configurations. The transformer
configuration must be checked by a
qualified technician prior to startup.
The power and control wiring may be
brought up through the utility entry. Protect
the branch circuit in accordance with code
requirements. Control wires and power
should not be run inside the same conduit.
The unit must be electrically grounded in
accordance with the current National
Electric Code.
Power wiring is to the unit terminal block or
main disconnect. All wiring beyond this
point has been done by the manufacturer and
cannot be modified without effecting the
unit’s agency/safety certification.
Note: Startup technician must check motor
amperage to ensure that the amperage listed
on the motor nameplate is not exceeded.
Electric shock hazard. Before
attempting to perform any installation,
service, or maintenance, shut off all
electrical power to the unit at the
disconnect switches. Unit may have
multiple power supplies. Failure to
disconnect power could result in
dangerous operation, serious injury,
death or property damage.
WARNING