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Table 8 - LED Diagnostic Codes
Number
of LED
Flashes
Fault
1
High Discharge Pressure
2
Emergency Shutdown
3
Auxiliary Alarm
4
High Condensate Level Alarm
5
Low Control Voltage Alarm
6
High Control Voltage Alarm
7
Low Suction Pressure
8
Leaving Water Temperature
Alarm
9
Air Coil Low Temperature
Alarm
10
Entering Water Temperature
Alarm
Automatic Reset Alarms
The following alarms will automatically reset
themselves once the fault condition clears.
Low Control Voltage Alarm
The low voltage alarm will trigger when the
24VAC control voltage drops to 20VAC +/-
5%. Below this voltage the onboard normally
open relays are not guaranteed to close. The
low voltage alarm will release when the
voltage rises above 22VAC +/-5%. Once the
fault is cleared the controller will activate a
random start delay. This alarm will disable
the compressor, the supply fan, and the
reversing valve.
High Control Voltage Alarm
The high voltage alarm will trigger when the
24VAC control voltage increases to 30VAC
+/-5%. Any voltage higher than this risks
damaging components on the control board.
The alarm will release when the control
voltage decreases to 28VAC +/-5%. Once
the fault is cleared the controller will activate
a random start delay. This alarm will disable
the compressor, the supply fan, and the
reversing valve.
Leaving Water Temperature Alarm
To prevent freezing of the liquid heat
exchanger, the leaving water temperature
alarm will activate and turn the compressor
off if the refrigerant saturated suction
temperature during heating drops below the
freeze protection temperature setpoints in
Table 9 - Glycol Percentage Setpoints, based
on the glycol percentage that is input into the
controller. The alarm will deactivate
(allowing the compressor to run again) after
ten minutes have expired and the refrigerant
saturated suction temperature rises 5°F above
the freeze protection temperature. If the
alarm is activated again within two hours, the
refrigerant saturated suction temperature
must rise 5°F above the freeze protection
temperature and the unit power must be
cycled off and on or the compressor
activation call from the thermostat must be
removed and then restarted.
The glycol percentage DIP switch “SW1” is
used to set the glycol percentage that is used
in the system for freeze protection. This
switch is located in the center of the control
board. The freeze protection setpoints change
based on the glycol percentage that is input to
the controller. It is critical that this setting
matches the actual glycol percentage used in
the system to prevent damage caused from
freezing. Inputting a glycol percentage that
is higher than actually used in the system can
cause extensive damage from freezing.
Summary of Contents for ProFit WV Series
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