APC ACPA4000 manual Alarm messages, Alarm Message, Action Required

Alarm messages

Alarm Message	Action Required
High head pressure	Ensure condenser exhaust air diverter is not blocked, facing a wall, or
	pointed at the condenser air inlet.
	Check the area above the ceiling where the condenser air is circulating
	for excessive heat buildup. Additional ventilation may be required.
	Check the condenser inlet filter for cleanliness.
Supply temperature	Alarm setpoint may be too low. Alarm should normally be set to 10° (C
high	or F) above the cool setpoint plus the dead band.
	Check that the unit is in cool mode and the compressor is running.
Supply temperature	Alarm setpoint may be too high.
low	Front airflow may be obstructed. Check the return air filter for
	cleanliness. Check the front discharge air grille for free air movement.
	Cooling setpoint may be too low to allow for at least an 11°C (20°F)
	temperature differential between return and supply temperatures.
	Example: A setpoint of 21.1°C (70°F) could have a supply temperature
	as low as 10°C (50°F).
Return temperature	Alarm setpoint may be too low.
high	Check that the unit is in cool mode and the compressor is running.
	Equipment capacity may be too small for room load.
	Ensure that return air (air coming back to the equipment) is not from a
	direct heat source, equipment discharge fan, or room supply duct.
	Alarm delay may be too short. Sufficient time must be allowed to let the
	equipment bring the temperature in the space under control. This is
	especially true at equipment start-up.
Return temperature	Alarm setpoint may be too high.
low	Verify that the return air is not coming from a cold air supply source such
	as a room discharge duct.
	There should not be any obstructions near the grill front that could divert
	supply air back to the return air grill.

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