P266 Series Single-Phase Condenser Fan Speed Control Installation Instructions
5
Low Pressure Mode
Low Pressure Mode determines whether the fan motor
is either On (at start voltage/minimum speed) or Off
when the sensed pressure at the P266 transducer is
below the start pressure setpoint.
Start Pressure Value
Start pressure (psi or bar) is the pressure setpoint at
which the P266 Series control outputs the start voltage
and runs the fan motor at minimum speed.
Start
Pressure value
is a function of the start pressure
setpoint and the pressure range of the referenced
P266 transducer. Use the following formula to calculate
the Start Pressure value. See Table 3 for P266
transducer pressure ranges.
End Pressure Value
The end pressure setpoint is the pressure (bar or psi)
at which the P266 Series control outputs the End
Voltage and runs the fan motor at maximum speed.
End Pressure value
is a function of the end pressure
setpoint and the total pressure range of the referenced
transducer. Use the following formula to determine your
application End Pressure value. See Table 3 for P266
transducer pressure ranges.
Split Winding Mode
Some single-phase PSC motors have split motor
winding wire leads. Setting the Split Winding mode On
enables the M2 Triac to provide voltage to the main
windings (and not the auxiliary windings), which
increases motor efficiency (Figure 3A and Figure 4A).
Note:
Split Winding mode is available for
only
240 VAC single-phase PSC motors that have split
winding wire leads
. Refer to the motor manufacturer’s
installation instructions to determine if your fan motor
may be wired to enabled the Split Winding mode.
Copeland Digital Scroll™
Compressor Mode
Digital Scroll Compressor Mode allows you to use the
P266 Series control on a system that uses a digital
scroll compressor. Failure to enable the digital scroll
compressor mode when using a digital scroll
compressor may cause your condenser fan to oscillate.
End Voltage Mode
End voltage is the voltage output by the P266 Series
control (as a percentage of the full voltage) that is
maintained when the monitored pressure is equal to or
greater than the End Pressure. The End Voltage mode
can be set to either 95% or 97% of the total input
voltage. See Figure 5.
Start Voltage (VAC)
P266 Control
Input Line- Voltage (VAC)
Start Voltage
Value (%)
Start Pressure
Setpoint (bar or psi)
P266 Transducer Pressure
Range (bar or psi)
X 250
=
Start Pressure
Value
End Pressure
Setpoint (bar or psi)
P266 Transducer Pressure
Range (bar or psi)
X 250
=
End Pressure
Value
Figure 5: Relationship between
P266 Fan Speed Control Variables
Start
Pressure
End
Pressure
0
Start
Voltage
End
Voltage
Mode
Low Pressure Mode
Off
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Low
Pressure
Mode
On
Pressure at Sensor
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26
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