Emerson E2 operation manual Appendix F Troubleshooting F-3

SYMPTOM	POSSIBLE PROBLEM	SOLUTION
Compressor will not Operate	Compressor is not programmed	Verify that E2 was programmed
	properly.	for correct number of compres-
		sor stages. Highlight the General
		tab (C1) in the Suction Group
		Setup screen. Is the correct num-
		ber of stages in the “Number of
		Stages” field?
	Compressor types are set up	Make sure that compressor
	incorrectly.	stages were properly set up as
		VS (variable speed), C (com-
		pressor), or U (unloader).
	Compressor programmed with	Verify that compressors were
	incorrect rating.	assigned the proper rating (HP/
		AMP, or BTU).
	Pressure setpoints are set up	Set proper pressure setpoints.
	incorrectly.	If you are controlling the rack
		using suction pressure, enter the
		pressure setpoint in the SUC
		PRES SETPT field. If you are
		controlling by temperature, enter
		the temperature setpoint in the
		CTRL TEMP SETPT field.
		Note: Pressure setpoints are
		located under the Setpoints tab
		(C2) in the Suction Group Setup
		screen.
	Board and point addresses are	Set proper board and point set-
	incorrect.	tings for input, output, and com-
		pressor outputs. Board and point
		settings are located under the
		Inputs tab (C4), Outputs tab
		(C5), and Comp Outs tab (C7) in
		the Suction Group Setup screen.

Appendix F: Troubleshooting • F-3