LED Diagnostic Indicators

		562156-UIM-A-0610
TABLE 2: TEST Input Functionality

Duration of	Control Behavior with no system	Control behavior with system
connection (seconds)	master signals present	master signals present

< 2	No response	No response
	Display compressor type TS, Ultratech, or	Bypass ASCD (Reduce timer to zero immediately).
	Display compressor type TS, Ultratech, or	If Y1 (thermostat or communication) is present and the
	single stage compressor, Ignore LPS	If Y1 (thermostat or communication) is present and the
	single stage compressor, Ignore LPS	high-pressure switch is closed, contactors will be energized.


	Clear soft lockout	Clear soft lockout
2 <
2 <	Clear hard lockout	Clear hard lockout

	Reset TS anticipation mode counter	Reset TS anticipation mode counter
	to zero for TS systems.	to zero for TS systems.

		Reduce TS staging delays for TS
		systems as described below.

Connection removed	Resume normal LED display
Connection not removed	Nothing more than previously explained

The control includes two LED’s that display diagnostic information. LED1 is red and LED2 is green. These LED’s are used to display oper- ational mode, fault information. A third LED, LED3 is used to display status information. LED3 is yellow. These LED’s are used to display operational mode, status, and fault information.

OPERATIONAL MODE DETECTION

The control can be used in a variety of applications including AC units with multistage compressors. The control uses various inputs to deter- mine the proper mode of operation.

The control senses the connections that are made to M, M1, and M2 terminals and determines the correct operational mode for the control. This is done each time power to the control is cycled. Therefore, it is important that no loads be attached to the M1 or M2 terminals of the control for single-stage compressors, and no loads be attached to the M1 terminal of the control for a scroll two-stage compressor.

Do not connect any loads to the M1 or M2 terminals of the control for single-stage compressors, and no loads should be attached to the M1 terminal of the control for scroll two-stage compressor. Incorrect system behavior could result.

OPERATIONAL MODE DISPLAY

The control will display its active operational mode using the onboard LED’s when the TEST pins are connected while no thermostat signals are energized. Table 3 "Operational Mode Display" describes the oper- ational modes. The control will display the operational mode as long as the TEST pins are shorted and no thermostat signals are energized. When the TEST pin short is removed, the control will return to normal LED displays.

TABLE 3: Operational Mode Display

Compressor Type	LED1 (Red)	LED2 (Green)

Single Stage Compressor	1 flash	---

TS Compressor	2 flashes	---

UltraTech Compressor	3 flashes	---

STATUS CODE DISPLAY

The control also provides status codes using the LED’s. Status codes indicate the state of the operation of the unit but do not represent a fault. Tables 4 & 5 describes the LED displays during status codes. Sta- tus codes will not be displayed when a fault code is present.

TABLE 4: Status Code Display

Description	Required Condition		LED1 (Red)	LED2 (Green)

No power to control	No power to control		OFF	OFF
	TS – M & M1 energized,
First-stage compressor operation – TS or UltraTech	UltraTech – M energized,		OFF	ON
	Single Stage - NA

Second-stage compressor operation - TS, UltraTech, or	TS and UltraTech – M & M2 energized,		ON	ON
Single Stage	Single Stage – M energized		ON	ON
Single Stage	Single Stage – M energized

Control normal operation – no communication or call for	No faults active, Y1 or Y2 not present		OFF	2s ON / 2s OFF
compressor present	No faults active, Y1 or Y2 not present		OFF	2s ON / 2s OFF
compressor present

Control normal operation – in ASCD period	No faults active, Y1 or Y2 present,		OFF	0.1 sec ON /
Control normal operation – in ASCD period	ASCD timer not expired		OFF	0.1 sec OFF
	ASCD timer not expired			0.1 sec OFF

TABLE 5: Status Code Display

Description		Required Condition		LED3 (Yellow)

Control normal operation – with active communication present		System is active and presently communicating successfully.		0.1 sec ON /
		System is active and presently communicating successfully.		0.1 sec OFF
				0.1 sec OFF

Control powered – without active communication present		System has 24 VAC present and the microprocessor is active.		2s ON / 2s OFF

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TABLE 2: TEST Input Functionality

Clear hard lockout