Specifications

57
© 2012 Emerson Climate Technologies, Inc.
Printed in the U.S.A.
AE8-1368 R2
• 24VAC input power to the sensor module
• 24VAC output power to the control module
4. Remove the two retaining nuts securing the
sensor module to the terminal box and remove
the module.
5. Install the new module by reversing the steps
listed above. When re-connecting the compressor
voltage sensors be sure that the black lead
is connected to the compressor terminal
corresponding to the current sensor.
6. Once the new module has been secured to the
terminal box replace the terminal box cover and
secure in place.
7. Apply power to the compressor and module. Once
the unit has been powered up the control module
should display a message of Normal Running or
Normal OFF.
7.3 Installation Torque Values
Component Torque Value
Control Module Mounting Screws 85-105 in*lb
Control Module Mounting
Bracket Nuts
42-50 ft*lb
Sensor Module Mounting Nuts 26-31 in*lb
Pressure Cutouts
(585-0125-03/-04)
95-108 in*lb
Pressure Cutouts (Other) 160-180 in*lb
Temperature Probe 170-200 in*lb
Current Sensor Mounting Nuts 26-31 in*lb
Motor Terminal Nuts 75-85 in*lb
Solenoid Valve Nuts/Bolts 42-50 ft*lb
Schrader Fittings (1/8" NPT) 120-180 in*lb
7.4 Demand Cooling Service Procedures
The demand cooling valve injects liquid refrigerant
into the suction manifold to keep the discharge gas
temperature within a safe operating range. Excessive
discharge gas temperature will lead to ring and cylinder
wear, valve wear and oil coking. Each Copeland
Discus compressor with CoreSense Diagnostics
has a temperature probe in the head to continually
monitor the discharge gas temperature. The injection
valve is energized when the temperature of the probe
exceeds the “Injection Start” temperature. When
the probe temperature drops below the “Injection
Stop” temperature, the injection valve closes (is
de-energized). Refer to Table 7.0 for reference
temperatures by model.
Note that the temperatures shown for 2D and 3D
Copeland Discus compressors with CoreSense
Diagnostics are lower than for standard demand
cooling compressors. This is to compensate for the
updated probe location used on the Copeland Discus
compressors with CoreSense Diagnostics. The
actual peak gas temperatures inside the head are
correspondingly higher and will be at the standard
demand cooling levels during injection start, injection
stop and at the maximum trip temperature.
The following demand cooling service procedures are
covered below:
• Temperature probe inspection
• Coil inspection and replacement
• Injection valve replacement
Thermometer
Temp. (F°)
Calculated
Sensor
Resistance
(Ohms)
Thermometer
Temp. (F°)
Calculated
Sensor
Resistance
(Ohms)
59 141426 86 72504
60.8 135000 87.8 69480
62.6 128907 89.6 66609
64.4 123129 91.4 63864
66.2 117639 93.2 61254
68 112437 95 58770
69.8 107478 96.8 56394
71.6 102762 98.6 54126
73.4 98289 100.4 51966
75.2 94041 102.2 49914
77 90000 104 47943
78.8 86139 105.8 46053
80.6 82476 107.6 44262
82.4 78984 109.4 42543
84.2 75663
Table 7.1 Temperature Probe Resistance
Head
Temperature
(°F)
Standard
Demand
Cooling
2D/3D
CoreSense
Diagnostics
4D/6D
CoreSense
Diagnostics
Maximum (Trip) 310 290 310
Liquid Injection
Start
292 276 282
Liquid Injection
Stop
282 272 273
Table 7.0