Data Aire dap4 - Alarms Overview; Humidity and Heat Inhibition Alarms

119
Alarm Screen
Description &
Classification
Possible Causes
Corrective Actions
• Return duct damaged
• Sensing Bulb is loose
• Over charge of
refrigerant
• Expansion valve
Overfeed
• Faulty high-pressure
switch. Cut out:
R410A at 575 PSI or
R407 at 450PSI.
• High indoor temperature, check
blower speed, and check
equipment selection
• Check return duct for leakage
and check temperature entering
evaporator coil
• Tighten bulb bracket
• Check sub-cooling (8-10) and
adjust charge if necessary.
Recover charge, evacuate, then
re-charge system
• Adjust and check expansion
valve operations
• Replace high pressure switch
Compressor
Short Cycle
Compressor
has started
more than 10
times in an
hour.
** Urgent
• Not enough Heat Load
or Oversized System
• Temperature Dead
Band is set too low
• Humidity Dead Band
is too low (causing
frequent dehum
cycles).
• No electric reheat
• Lack of vapor barrier
• Unusual high rate of
building heat gain
• Check for heat load
• Check and raise Temperature
Dead Band
• Check and raise Humidity Dead
Band
• Check reheat elements for
proper operation
• Seal room with the proper vapor
barrier
• Check room infiltration
Hi Humidity
The return air
humidity is
higher than the
high humidity
alarm limit.
*Warning
• Humidity is too High
• Humidity alarm set
point needs to be
adjusted
• Check humidity in the room
• Check High humidity alarm set
point (range 35%-90%)
• Check water vapor infiltration