Specifications

27
Unit operates but windows
have condensation
Poor air distribution
Ensure all exterior windows
see 3-5 CFM/ft² of glass over
their entire area
Airflow across evaporator is
too high. Coil only doing
sensible cooling
Check bypass damper
operation. Ensure fully open or
recalibrate in Service mode.
Unit is undersized
Re-evaluate unit sizing. Check
for initially neglected sources
of humidity
Air and/or pool water
temperature incorrect
Reset controller setpoints to
original design specifications
Pool Water Heating
(PH and PV Models)
Low water temperature rise
Solenoid valve not opening
Excessive water flow. This
erodes the water heater and
must be rectified.
High water temperature rise Insufficient water flow.
Compressor runs for short
periods and shuts off
Conditions are being satisfied
quickly
Check register locations for
short-circuiting of air
Unit oversized
Low Supply Air Temperature
rise in Dehumidification Mode
Too much airflow through unit.
Balance the system airflow as
directed in section 6.4
High Supply Air Temperature
rise in Dehumidification Mode
Too little airflow through unit.
Close bypass plugs until
desired target range reached.
Re-evaluate duct pressure
losses to ensure they are
within the parameters
indicated on the unit
nameplate.
6.3. Microprocessor Troubleshooting
Issue Possible Cause Remedy
Communication fault
Broken or loose wire between
controller and IO board
Repair any damaged or loose
wires.
Corrosion on pins or terminals Clean pins and terminals
Defective IO board – LED is
not on
Replace IO board
Defective controller Replace controller
Sensor fault
Sensor wires broken or
shorted to ground
Connect sensor directly to IO
board. If it functions replace
wire.
Sensor reading outside design
parameters
Replace sensor
Setpoint out of range
Setpoint parameters are
outside acceptable limits
Reenter setpoint. Replace
sensor if problem persists
Emergency operation mode on
Manually selected by user Replace controller