Danfoss Turbocor VTT Series, Service Manual, Page: 42 / 165

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M-SV-VT-001-EN Rev. A
3.2.6 Economizer Blank
The Economizer Blank is used when the economizer option is not being utilized. This is also used
anytime the Compressor is removed from the chiller to prevent contamination ingress.
Compressor Components
Figure 32 - Economizer Blank
3.2.6.1 Removal and
Installation
Economizer Blank Removal:
1. Isolate the Compressor power as described in the “Electrical Isolation of the Compressor/VFD”
section of this manual.
2. Isolate the Compressor and recover refrigerant.
3. Remove the four (4) Economizer screws.
Economizer Blank Installation:
1. Verify all contact surfaces are clean and dry. If not, clean with a lint-free cloth.
2. Lubricate the new O-ring and place it onto the Compressor housing O-ring groove.
3. Using the four (4) M16 screws, install the Economizer Blank. Finger-tighten and then tighten in a
crisscross pattern in two (2) stages.
• Stage 1: Tighten to 30 Nm (22 ft.lb.)
• Stage 2: Tighten to a final torque of 100 Nm (73 ft.lb.)
4. Leak test the Compressor to the appropriate pressure and industry standards.
5. Evacuate the Compressor to the appropriate pressure and industry accepted standards.
6. Charge the Compressor with refrigerant.
7. Restore power to the Compressor.
NOTE
The same torque would apply if the Economizer option is used and a pipe flange is attached to the
Compressor.
Description Nm Ft.Lb. In.Lb.
Economizer, SHCS, M16x40 100 73 -
Table 10 - Economizer
Torque Specifications
3.2.6.2 Torque
Specifications
Torque to 100 Nm (73
ft.lb.) (4 places)