AGL_HP_VS_YHV2P_E_Rev0 9
NOTE: For matched pairs with smaller drives, please check the application envelopes in
Copeland™ brand products Select software at www.climate.emerson.com/en-gb.
Please note the following about operating envelopes:
▪ Before compressor start with the matched pair of YHV*2P and ED3, the pressure difference in
the system has to be below 10 bar. If the pressure difference is reduced by opening the
expansion valve, care must be taken to avoid liquid flood back to the compressor – also see
chapter 3.3 "Accumulators" and Figure 16.
▪ An oil return test for the system must be performed. If required, the system design should be
improved to ensure sufficient oil return from the system to the compressor – also see chapter
5.14 "Oil level".
▪ At start-up the system should be able to bring the compressor to a point inside the envelope as
fast as possible and to keep the compressor running there. Running outside the envelope is not
allowed. Emerson’s recommendation is to start with a speed of 3000 rpm and to freeze the
speed for minimum 30 seconds or longer until the system is in stable operation – see Figure 8
"Ramp up".
▪ Running/oscillating the compressor in and out of the envelope borders is not allowed and should
be avoided.
▪ Running the compressor below the envelope at low condensing temperatures is possible for no
longer than 30 minutes but the user must be aware that unloading noise from the compressor
can occur. In this area the speed limits according to the evaporating temperatures in the
envelope should be respected.
▪ The qualified application envelopes will change with the compressor speed. At all operating
conditions the minimum and maximum speed limits according to Figures 4 to 7 have to be
respected. With changing operating conditions the speed limits have to be determined by linear
interpolation between the limits given in Figures 4 to 7 – also see speed limits animation in
Select software available at www.climate.emerson.com/en-gb.
▪ Fast speed changes can cause instable control, eg, on the superheat control. Per Emerson
experience speed changes should be in the range of 10 to 60 rpm/s depending on the system
reaction.
▪ The user should adequately take care of controlling the envelope.
▪ To stop the compressor, reduce the speed to 3000 rpm then stop the compressor – see Figure 8
"Controlled shutdown".
Figure 8: Ramp-up and controlled shutdown
NOTE: Before first start, each drive has to be configured according to the compressor model.
NOTE: The ED3 drive overload protection aims at protecting the drive and the compressor. It
cannot be used in the system as an operating envelope limitation. For more details on the
overload protection refer to the ED3 User Manual (June 2019 version).
To Next Page
Loading...
