Johnson Controls P266 Serie Instrucciones De Instalación página 9

• a 24 VAC Class 2 power supply (only for P266
Series control models that require an external
24 VAC power supply)
• a Low-Speed Capacitor (LSC), sized for the fan
motor (only for P266 Series control applications
that use a low-speed capacitor)
Note: The LSC should be equal in both the
voltage range and the microfarad value to the
motor manufacturer's auxiliary capacitor, but the
LSC must not exceed 15 microfarads.
Setting up Test Voltage Mode
Before you power on a P266 Series control and enable
the Test Voltage mode on the control:
1. Read and follow the guidelines and procedures in
the Mounting and Wiring sections.
2. Mount and wire the P266 Series control in your
condenser application and observe these
additional guidelines:
• Refer to the label inside the P266 Series
control housing cover for model-specific wiring
details. See Wiring for some wiring options.
• Wire the auxiliary and main windings according
to the motor manufacturer's instructions and
your application requirements. Split the
windings (at the winding leads) and power
them separately, if your application and motor
allow for split-winding operation. See Figure 3
and Figure 4.
• If your application uses an optional low-speed
capacitor, wire the LSC to the M3 triac and
motor only after you have checked and
recorded the current draw at maximum. See
Determining Changeover Voltage Value.
• If your P266 Series control model requires an
external 24 VAC power supply for control
operation, wire that power supply to the
control. (Refer to the wiring label inside the
P266 Series control cover for external power
supply requirements.)
• You do not have to connect, wire, or power the
P266 transducer, or put a load on the
condenser to operate a P266 Series control in
the Test Voltage mode. Test Voltage mode
allows you to use the DIP switch to set the
voltage supplied to the motor by the P266
Series control.
8 P266 Series Single-Phase Condenser Fan Speed Control Installation Instructions
3. Set up the P266 Series control and the condenser
fan motor for the intended operation, by setting the
required values and modes of operation for your
condenser fan application. See Setup and
Adjustments for procedures.
Determining Changeover Voltage Value
In the Test Voltage mode, you can determine and set
the Changeover Voltage value for P266 Series control
applications that use an optional low-speed capacitor.
To determine and set the Changeover Voltage value:
1. Mount, wire, and set up the P266 Series control
and the condenser fan motor for operation in the
Test Voltage mode. See Setting up Test Voltage
Mode.
Note: Do not wire the low-speed capacitor until
Step 6 of this procedure.
2. Set all of the DIP switches except switch 1 to the
ON position; set switch 1 to OFF.
3. Apply line-voltage power to the P266 Series control
(and the external 24 VAC power supply on required
models), then, within the first 30 seconds after
applying power, press and release the push button
three times. The LED goes off and stays off, and
the fan motor accelerates to maximum speed (at
95 or 97% of maximum voltage) and stays at the
maximum voltage for up to 5 minutes.
4. At maximum voltage, use the clamp-on ampere
meter to check the current draw (in amperes) of the
fan motor auxiliary windings and record the
auxiliary windings current draw for the motor at
maximum voltage.
5. Disconnect line-voltage power to the P266 Series
control (and the external 24 VAC power supply on
required models).
6. Wire the low-speed capacitor to the M3 triac and
the motor auxiliary windings. (See Figure 3 and
Figure 4 for M3 triac wiring options.)
7. Set all of the DIP switches except switches 8 and
32 to the OFF position; set switches 8 and 32 to
the ON position. (8 + 32 = 40% of maximum
voltage value.)
8. Apply line-voltage power to the P266 Series control
(and the external 24 VAC power supply on required
models), then, within the first 30 seconds after
applying power, press and release the push button
three times. The LED goes off and stays off, and
the fan motor accelerates to the speed at 40% of
the maximum voltage (for up to 5 minutes).