Table 2: Matched pairs ED3 with YHV*2P
The YHV*2P compressors with protection code "X" (see chapter 2.3) listed in Table 3 are sold as
unprotected compressors. They are dedicated for use with a third-party drive. The motor protection
is under the responsibility of the system manufacturer/installer.
Table 3: Unprotected YHV*2P compressors
A third-party control system must include discharge temperature
protection, current overload
protection, and a soft
start and stopping routine. Stator heat control is also recommended for optimal
performance and reliability. It should also include the operating map parameters. Contact the
Application Engineering department at Emerson for compressor motor
specifications and speed
adjustment requirements.
It is important to ensure correct wiring at both the
compressor and drive connections prior to
starting the compressor to avoid miswiring or powered reverse situation. Both situations could
potentially cause compressor damage.
NOTE: For the latest list of matched pairs ED3 with YHV*2P please refer to the ED3 User
Manual (June 2019 version) or contact the Application Engineering department at Emerson.
2.2 Variable speed advantages
The variable speed scroll is a key component in the variable capacity system. A variable capacity
system will use less electrical energy by minimizing on-off cyclical losses, maximizing heat
exchanger efficiency by operating at part load during a majority of the total operating hours, and by
operating with reduced airflow rates and blower power.
The variable speed scroll and drive are suitable for a variety of "best-in-class" applications. Both may
be used in other types of applications provided that the envelope and other operating restrictions are
met. The primary benefit of this product is to substantially reduce electrical energy consumption and
associated expenses.
Additionally, a variable speed scroll offers the capability of controlling space and domestic hot water
temperature to ranges exceeding simple on-off control, improving overall comfort levels inside the
building. The onboard electronics embedded in the drive greatly reduce the possibility of operation
outside the designed parameters which in turn increases overall system reliability.
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