Specifications

58
© 2012 Emerson Climate Technologies, Inc.
Printed in the U.S.A.
AE8-1368 R2
7.5 Temperature Probe Inspection
Erroneous temperature probe readings may be due
to “sprung” connections at the harness, or corrosion
on the harness connector surfaces. A reading of
approximately 0F and a display code of “Fault Temp
Probe Trip” is indicative of an open circuit or poor
electrical connection. Unplug the temperature probe
from the harness and measure the probe resistance to
determine whether the probe itself is faulty.
Refer to Table 7.1 for expected resistance values based
on probe temperature.
Plug the connector back in and look at the head
temperature for this compressor on the E2 screen.
Agreement between the calculated probe temperature
based on resistance and the E2 temperature indicate the
harness connection is good. An extreme temperature
indicates the probe is faulty. A probe temperature based
on resistance that seems reasonable based on the
approximate temperature of the head indicates the probe
itself is not faulty. If the E2 shows a head temperature
that is obviously not correct, visually inspect the harness
connector to look for signs of corrosion or for “sprung”
female terminals in the harness. If the terminals appear
to be “sprung”, carefully squeezing the outside of the
plug to reconfi gure their shape may yield acceptable
contact. If the connections are not repairable, refer to
Appendix G for a list of service replacement parts.
Nyogel 760G lubricating grease is used in the connector
to prevent fretting and corrosion.
7.6 Coil Inspection and Replacement
Refer to fi gures in Appendix E for the location of the
injection coil. The coil may be removed by unplugging
the harness from the coil and lifting the coil. Coils used
on Copeland Discus compressors with CoreSense
Diagnostics are 24VAC.
7.7 Injection Valve Replacement (4D and 6D)
Reference Drawing of Enclosure and Accessories
Note: There are no unique injection valve service
procedures for the 2D/3D Copeland Discus
compressors with CoreSense Diagnostics. Use
conventional 2D/3D valve change-out procedures
and keep the torch fl ame away from the conduit
wire harness to avoid damage.
1. Disconnect power to the compressor and module.
2. After isolating the liquid line by closing the shutoff,
relieve trapped pressure by actuating the solenoid.
This is very important! When heated, pressures
generated by trapped refrigerant may lead to a
ruptured tube. Wear safety goggles when using
a torch. Evacuate the compressor per accepted
industry practice. Unsolder the injection tube
from the liquid line. A wet rag around the valve is
recommended for additional protection.
3. Unplug and remove the injection coil.
4. Loose the fl are fi tting that attaches the injection
valve to the compressor body (It may be necessary
to remove the sheetmetal enclosure on the 6D
compressor to gain access to this fi tting.)
5. Install a new valve and torque the fl are fi tting to
15 ft-lb.
6. Install the injection coil and reconnect the wiring
harness.
7. Reconnect the liquid line to the new valve. Note
that trimming the injection valve tube may damage
the internal strainer. Emerson recommends that
modifi cations not be made to the tube. Use the
same fl ame precautions as in step 2.
8. Use approved refrigeration service procedures to
evacuate the compressor and liquid line. Make
certain that liquid is available to the injection valve
by opening the supply valve.
8.0 Compressor Changeout Instructions
The following instructions assume that the same
control module and sensor module will be used on the
new compressor. If these modules are to be replaced,
refer to Section 7.0 of this document.
9.0 Removal of the Compressor (2D/3D)
1. Turn off power to the compressor, crankcase
heater, and CoreSense Diagnostics modules.
2. Isolate the compressor and evacuate per
accepted industry practice.
3. Inside the terminal box:
• Remove compressor power terminal lugs
• Disconnect/Unplug connections to the sensor
module including:
- voltage sensing leads
- crankcase heater output
- communication cable (to control module)
- 24VAC power output (to control module)
- Remove terminal box anchor screws
holding the box to the compressor (4x)
4. Remove screws that secure wiring harness
assembly to terminal box (2x)
5. Lift off terminal box.
6. Remove side cover screws to access pressure
controls (2x)
7. Unplug leads to high and low pressure switch,
temperature probe, and unloader (if present).