AGL_Ref_ST_ZO_E_Rev00
9
2.6.5 Design features
The variable-speed scroll ZOV*AG has a number of design features that improve efficiency and
reliability. An HVE valve is part of ZOV*AG models for higher performance at high pressure ratio.
This valve prevents reverse rotation during shutdown; however, some shutdown sound may occur.
All ZOV*AG compressors are equipped with a positive displacement oil pump to ensure an adequate
supply of oil to the bearing system throughout the operating speed range of 1500 to 6000 rpm.
The motor in the variable-speed scroll is a three-phase, brushless permanent magnet (BPM) design
coupled with a rotor embedded with high energy magnets. The input voltage is a series of +DC pulses,
spaced in time to create an alternating current frequency.
ZO(V)*AG compressors use a shutdown valve located in the discharge fitting. This check valve is
not a low-leak-back check valve and will leak when pressure differential across the check valve is
low.
Figure 7: ZO*AG compressor cross sectional view
Figure 8: ZOV*AG compressor cross sectional view
