AGL_HP_VS_YHV_RG_RT_EN_Rev00 11
2.7 Compressor design
2.7.1 Compressor features
The variable-speed scroll YHV*RG/RT compressors have a number of design features that improve
efficiency and reliability.
A HVE valve in the discharge port of the scroll is part of these models for higher performance at high
pressure ratio. This valve also prevents reverse rotation during shutdown; however, some shutdown
sound may occur.
All YHV*RG/RT 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.
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.
YHV*RG/RT compressors use a shutdown valve located in the discharge fitting. This check valve is a
low-leak check valve.
All the YHV*RG/RT models are fitted with a suction f unnel to guide the majority of the suction gas
internally directly to the scroll set.
2.7.2 Compressor dimensions
The external dimensions of YHV*RG/RT compressors are shown in Figures 10 & 11 below.
Figure 10: YHV029RG/RT & YHV046RG/RT
Figure 11: YHV072RG/RT
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