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Cut In Press and Cut Out Press
The Cut In setpoint determines the suction
pressure that, when exceeded, will cause the
compressor to turn ON. In this strategy, the com-
pressor will remain ON until the pressure falls
below the Cut Out setpoint, at which point the
compressor will turn OFF.
Minimum Suction Pressure
The Minimum Suction Pressure setpoint
serves two purposes. When the condensing unit
is operating in Refrigeration mode using the
Temperature strategy, the Minimum Suction
Pressure is the suction pressure at which the
compressor will be shut off regardless of the
case circuit temperature. This setpoint is neces-
sary as a safety feature since the CUB is control-
ling by temperature instead of by suction
pressure.
If you enabled the Pump Down feature for
this CUB, the Minimum Suction Pressure also
acts as the termination setpoint for the pump
down delay. The Pump Down period will end
when the suction pressure falls below this set-
point.
NOTE: The following screens are only for
CUB-II with Trad (Traditional) Strategy
(Condenser SPs, Condenser Fan 1 Setpoints,
and Condenser Fan 2 Setpoints).
8.2.4.6.
Condenser SPs
Condenser SPs
Strategy: Trad
Num Fans: 2
Condenser Setpoints
The two fields on this screen show the strat-
egy being used and the number of fans being
controlled. The two following screens are for the
strategy set to Traditional control. Traditional
control uses Cut In/Cut Out setpoints for con-
trol-based on discharge pressure. For TD setup,
see Section 8.2.4.1., Condenser Setpoints.
Altering CUB Configuration Using The Hand-Held Terminal
Strategy
Set the type of condenser strategy that will
be used to cycle fans ON and OFF.
Number of Fans
Set the number of fans to be turned ON and
OFF by the chosen strategy type. The maximum
number of fans that can be controlled is two.
8.2.4.7.
Condenser Fan 1 Setpoints
Cond Fan #1
CutIn Press: 160
CutOut Pres: 140
MinOnTime: 1 M
The fields underneath the Condenser Fan #1
heading are where the Cut In/Cut Out setpoints
for condenser fan #1 are programmed.
Cut In Pressure
When the discharge pressure rises above the
Cut In setpoint, the fan will turn ON.
Cut Out Pressure
When the discharge pressure falls below the
Cut Out setpoint, the fan will turn OFF.
Min ON Time
The minimum ON time is the smallest
amount of time the condenser fan must remain
ON after being activated.
If using two condenser fans, program fan #1
with a lower Cut In setpoint than fan #2, so that
the fans will come on in stages.
8.2.4.8.
Condenser Fan 2 Setpoints
Cond Fan #2
CutIn Press: 170
CutOut Pres: 150
MinOnTime: 1 M
The fields underneath the Condenser Fan #2
heading are where the Cut In/Cut Out setpoints
for condenser fan #2 are programmed.
Cut In Pressure
When the discharge pressure rises above the
Cut In setpoint, the fan will turn ON.
Cut Out Pressure
When the discharge pressure falls below the
Cut Out setpoint, the fan will turn OFF.
The MultiFlex CUB Hand-Held Interface • 51
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