APC NETWORKAIR ACPA4000 User Manual download pdf (Page 36)

Operation: Responding to Alarms

30 NetworkAIR

ACPA4000 User Manual

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 condenser inlet filter for cleanliness.

Supply temperature

high

Alarm set point may be too low.

Check to see if unit is cooling. Verify at least a 15° F (9.4° C)

temperature difference between the supply and return temperatures.

Supply temperature

low

Alarm set point may be too high.

Front airflow may be obstructed. Check return filter and front unit grills

for free air movement.

Cooling set point may be too low to allow for at least a 20° F (6.6°C)

temperature differential between return and supply temperatures, based

on the cooling set point. Example: A set point of 70°F (21.1°C) could

have a supply temperature as low as 50°F (10°C).

Return temperature

high

Alarm set point may be too low.

Unit capacity may be too small for room load.

Ensure that return air coming back to the unit 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

unit bring the temperature in the space under control. This is especially

true with new equipment start-ups.

Return temperature

low

Alarm set point may be too high.

Verify that the return air is not coming from a cold air supply source

like a room discharge duct.

There should not be any obstructions near the grill front that could re-

divert supply air back to the return air grill.

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APC NETWORKAIR ACPA4000 User Manual Page 36