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M-SV-VT-001-EN Rev. A
Compressor Components
3.2.1.3 Torque
Specications
Description Nm Ft.Lb. In.Lb.
IFV Set Screws 3 - 27
Industrial Control Motor (ICM) Body Bolts 100 74 885
SHCS to suction and discharge sides of IFV pipe 70 52 620
Table 6 - IFV Pipe Assembly
Torque Specications
3.2.2 IFV Actuator The Industrial Control Actuator with Display (ICAD) 1200A controls the IFV position based on signals
from the CCM.
Functional Details
• Opening the IFV enables internal flow recirculation and increases the Compressor turn-down
capability by aerodynamic incidence control of the 1st stage diffuser and increases the flow
through the 2nd stage of the Compressor.
• The IFV has 1000 steps from open to close with a speed of 80 steps per second.
• The valve position is monitored by an optical counter device (Encoder) in the ICAD, and the
position is then fed back to the Compressor as an analog signal. The ICAD will automatically
calibrate at every power cycle. It can also be manually calibrated through the VTT Service
Monitoring Tool (SMT).
3.2.1.2 IFV Pipe Assembly
Verication
1. When power is applied to the Compressor, the IFV Actuator drives the valve fully closed and then
to the start position.
2. A warning will be generated if the IFV Actuator is unable to adjust the IFV position.
IFV Pipe Installation:
1. Verify all contact surfaces are clean and dry. If not, clean with a lint-free cloth.
2. Lubricate the new O-rings and place them on the IFV suction and discharge side flanges.
3. Place the IFV pipe in its proper location.
4. Loosely install all eight (8) screws from the suction and discharge side of the IFV pipe assembly.
5. Tighten all eight (8) screws from the suction and discharge side of the IFV pipe assembly evenly
and torque to specification.
6. Install the IFV Actuator to the Bonnet/Function Module ensure the actuator is fully inserted with
the wire connection ports facing up.
7. Install the three (3) set screws to the Bonnet/Function Module and torque to specification.
8. Attach the wires to the color coded ports on the IFV Actuator by turning the collar, located on
the cable end, in a clockwise rotation.
9. Leak test the Compressor to the appropriate pressure and industry standards.
10. Evacuate the Compressor to the appropriate pressure and industry accepted standards.
11. Charge the Compressor with refrigerant.
12. Restore power to the Compressor.
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