Emerson AE8-1385 User Manual

AE8-1385

Application Engineering

INTRODUCTION
Overview
CoreSense

™

Diagnostics is a breakthrough innovation

for troubleshooting residential air conditioning and heat

pump systems. The CoreSense Diagnostics module

is easily installed in the unit electrical panel near the

compressor contactor. By using the compressor as

a sensor, CoreSense Diagnostics helps the service

technician more accurately troubleshoot system and

compressor fault conditions.

CoreSense Diagnostics also provides compressor

and system protection through its proprietary lockout

feature. Depending on the severity and frequency of

the fault that caused the trip condition, the CoreSense

Diagnostics module can lockout the compressor

contactor to prevent damage to the compressor and

system components. Less severe fault conditions

resulting in an occasional trip will not result in a lockout

condition.

Flashing LEDs communicate ALERT and LOCK codes

to the service technician.

Application Restrictions and Types
The CoreSense Diagnostics (571-0072-00) module

is designed and qualifi ed for use with ZPS*K5 single-

phase Copeland Scroll

UltraTech

™

compressors.

Product Specifi cations

Operating Temp: - 40° to 150°F (- 40° to 65°C)
Storage Temp: - 40° to 175°F (- 40° to 80°C)
Supply Voltage: 18 to 28VAC , 48 to 62Hz
Module Current Sensing Range: 2 to 30A
Maximum Power Consumption: 2.5 VA (Excluding
solenoid load)

INSTALLATION
Mounting
Four #8 or #10 self tapping or sheet metal screws are

required for installation of the module. The maximum

mounting screw torque is 20 in.lbs. Locate the

module near the compressor contactor (wire routing

for compressor run, common, and start wires will be

easier in this position). The module can be mounted

in any orientation and LEDs should be visible for ease

of service.

The compressor’s run (R), common (C), and start (S)

wires are routed through the holes in the CoreSense

module marked “R”,”C”, and “S”. See Figure 1.

Terminal Description
The terminals for the CoreSense Diagnostics module

are ¼” spade terminals.

• COMMON (C)

The 24 volt common terminal for module power.

• DEMAND (Y)

The demand terminal requires a 24VAC signal

measured with respect to the COMMON (C)

terminal when there is a call for heating or

cooling. A signal above 6VAC indicates the

thermostat wants the compressor to be on, while

0-6VAC signal indicates the thermostat wants

the compressor to be off.

• SECOND STAGE DEMAND (Y2)

The demand (Y) and second stage demand

(Y2) terminals require a 24VAC signal measured

with respect to the COMMON (C) terminal when

there is a call for heating or cooling. A signal

above 10VAC indicates the thermostat wants the

Ultratech solenoid to be energized, while 0-10VAC

signal indicates the thermostat wants the Ultratech

solenoid to be deenergized.

• PROTECTION (PROT)

The protection terminal is internally connected

to the COMMON terminal through a solid state

switch.

• POWER (R)

The module requires a constant 24VAC supply

power to this terminal. The module must receive

an independent power supply in order to operate

properly. See Figure 4.

• Thermostat Communication (L)

Provides a 24V signal to an indoor thermostat

indicating the number of ALERT fl ashes displayed

on the module. (Reference thermostat manual for

available capability)

• Solenoid (DC SOL)

Provides a connection to the Copeland Scroll

UltraTech second stage compressor solenoid. This

solenoid is internal to the compressor, and has

a voltage range of 18 to 28VDC. Please refer to

bulletin AE-1311 for information on the Copeland

Scroll

UltraTech

compressor.