Thrush Pressurizer-VS PB-VSI Series - Manual (Page 11)

4.1 Piping Installation (Continued)
4. Suction piping directly affects the overall operation of the Pressurizer-VS and is
critical to performance. The pipe size should be sized to allow adequate flow at a
minimal head loss, and be, at minimum, the same size as the Pressurizer-VS
connections. The use of fittings (elbows, tees and couplings) should be kept to a
minimum as well. The same considerations should be applied when sizing and
laying out the discharge piping.
5. Isolation valves are required to allow mechanical seal changes and other
maintenance operations. A by-pass line is recommended to allow service of the
Pressurizer-VS without system shutdown during maintenance operations.
4.2 Electrical Installation
There is a potential for severe personal injury or death if proper electrical
installation procedures are not followed. A qualified electrician should make
all electrical connections.
Before installation and or servicing electricity to the VFD, refer to the VFD
manufacturers’ user manual supplied with the Pressurizer-VS for all safety
warnings and cautions.
Do not connect and or operate the Pressurizer-VS with volts, hertz, or phase
other than that specified on the VFD. This may cause damage to the VFD
and will VOID the product warranty
1. Each Pressurizer-VS model has a specific (voltage/hertz/phase) ‘supply power’
requirement. This information can be found on the side of the VFD on the tag.
Verify that the on-site power being ‘supplied’ to the VFD is as stated on the tag
located on the VFD. The motor on the Pressurizer-VS will always be a 3 phase
motor regardless of the VFD ‘supply power’ phase requirements of your model.
For example, if your specific model has been ordered to hook up to single phase
‘supply power’ to the VFD it will still be equipped with a 3 phase motor.
Always verify that the VFD is being supplied with the correct (voltage/hertz/phase)
‘supply power’.
2. Check the VFD and all electrical devices for any loose or damaged connections.
See figures in Section 6.1 (ABB Drive) or 6.2 (Yaskawa Drive). Do not operate the
Pressurizer-VS until all loose or damaged connections have been repaired.
3. All electrical components are wired at the factory. Only main power connections to
the VFD are required. The main power wires should be brought into the bottom
side of the VFD and connected to the power input terminal lugs, see Figure 6.1.1
or 6.1.2. An additional disconnect panel located near the VFD may be required to
meet et local electrical codes. All electrical wiring should meet standard and local
code requirements.
Thrush Co.
Manual #9636-1400
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