© 2017 Emerson Climate Technologies, Inc.
8
AE21-1355 R4
For three phase Copeland Discus digital compressors:
the compressor’s T1, T2 and T3 wires must be routed
through the holes in the Digital Compressor Controller
module marked “T1,” “T2” and “T3.” The Digital
Compressor Controller module is phase insensitive and
will NOT detect reverse phasing of the compressor.
NOTE:
Do not bundle low voltage wires with
compressor power or high voltage wires.
NOTE:
Attach cable ties through loops on side of the
housing for wire strain relief.
Control Requirements with CoreSense
Diagnostics
Discus Digital compressors are also compatible with
CoreSense
™
Diagnostics and newer technology. Using
CoreSense Diagnostics eliminates the need for the
separate Copeland Digital Compressor Controller in
system wiring.
NOTE: Discus digital is not
compatible with Intelligent Store Discus 1.0.
Master Controller
The Copeland Discus digital compressor is approved for
use with E2 v2.3 facility management system and
higher. The compressor should be specifically identified
as digital in the E2 in the staging setup. For any other
system controllers please check with your Application
Engineer. If using a Discus
™
digital compressor with
CoreSense Diagnostics with the E2 system controller,
E2 v 2.6 or newer is required. You do not need the
Digital Compressor Controller when using CoreSense
Diagnostics. For more information on the E2 system
controller access the E2 user manual at:
http://www.emersonclimate.com/en-
us/Products/Controls/Facility_Controls/E2/Pages/e2.as
px
For additional information on CoreSense Diagnostics
refer to the application guidelines in
CoreSense Diagnostics v2.11
.
Recommended Application Settings for the
Modulation on Copeland Discus Digital
Compressors
The system design should follow the required and
recommended guidelines as detailed in the various
Application Engineering bulletins, which can be found
on
the
website
at
The
compressor motor should only be restarted after an
appropriate time delay. The digital modulation cycle
time recommended is 20 seconds; for other values,
check with your Application Engineer.
The minimum load and unload times should be limited
to 2 seconds. These described load and unload times
will give the compressor an operating range during a 20
second cycle from 10% load up to 90% load (on 3D only
– 4D and 6D minimum percent capacity would be 50%,
33% or 67% depending on compressor configuration).
The compressor can also operate at a 100% load for the
full modulation sequence. The 2 second minimum times
will give the unloader piston assembly time to both load
and unload fully.
If the load required is less than 10% minimum percent
capacity of the digital compressor (10% for 3D, 50% for
4D or 33% or 67% for 6D) the compressor motor should
be shut down. Restarting of the compressor will be
governed by the capacity rising above the10% minimum
percent capacity or more based on a modulation time of
20 seconds, and by the motor starting logic.
Solenoid Valve/Gaskets
Due to the high life cycle requirements in a hot gas
environment, a special valve has been developed. Due
to reliability requirements, only Emerson solenoid
valves may be used. All compressor warranties are null
and void if the Emerson valve is not used. Solenoid coils
will be sold separately for all non-CoreSense
Diagnostics orders. See
solenoid kit number for your application.
Furthermore,
Discus digital compressors use special head and valve
plate gaskets which have modifications to ensure gas
flow for proper digital modulation. Only Emerson
approved gaskets may be used. All compressor
warranties are null and void if the Emerson gaskets are
not used.
Table 1
Solenoid Coil Voltage
Kit Part Number
24V
923-0084-00
120V
923-0084-01
240V
923-0084-02
Thermistor
The thermistor must conform to the curve characteristics
outlined in
. The table expresses the ratio of the
resistance at the indicated temperature and the
resistance at 25°C (77°F). The resistance at 25°C
(77°F) is 86K ohms nominal. The curve fit is: Ratio =
