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Pioneer Gold 3.00 Controller Technical Guide
Alarms
All alarms will be monitored and displayed through the Pioneer
A Status LED indicates the unit status. A green status light
indicates that the unit is powered up. A red “Alarm” relay LED
indicates that the controller has detected a fault condition and is
now in Alarm mode.
Automatic Reset Alarms
The following alarms will automatically reset themselves once
the fault condition clears.
Low Control Voltage Alarm
The Low Control Voltage Alarm will trigger when the 24 VAC
control voltage drops to 18 VAC +/-5%. Below this voltage,
the onboard normally open relays are not guaranteed to close.
This alarm will disable the compressor, the supply fan, and the
Reversing Valve. The low voltage alarm will release when the
voltage rises above 20 VAC +/-5%. Once the fault is cleared, the
controller will activate a random start delay.
High Control Voltage Alarm
The High Control Voltage Alarm will trigger when the 24 VAC
control voltage increases to 32 VAC +/-5%. Any voltage higher
than this risks damaging components on the control board.
This alarm will disable the compressor, the supply fan, and
the Reversing Valve. The alarm will release when the control
voltage decreases to 30 VAC +/-5%. Once the fault is cleared,
the controller will activate a random start delay.
Entering Water Temperature Alarm
The Entering Water Temperature Alarm will trigger if the entering
water temperature becomes too cold or becomes out of range.
The alarm will trigger if the entering water temperature drops
below 30°F for two minutes. This alarm will disable waterside
economizer operation but allow operation of the compressor
and supply fan. The alarm will release when the entering water
temperature rises above 35°F.
Evaporator Coil Temperature Alarm
The Evaporator Coil Temperature Alarm will trigger if the suction
line temperature drops below 30°F or becomes out of range. The
alarm will release when the coil temperature increases to 45°F.
This alarm will disable the compressor but allow operation of
the supply fan.
Space Sensor Alarm
The Space Sensor Alarm will trigger if the space temperature
or humidity sensor readings are out of range, or communication
is lost to the sensor. This alarm will disable the compressor
but allow operation of the supply fan. The alarm will release
when the space sensor reading is in the acceptable range (Space
Entering Hot Water Temperature Alarm
The Entering Hot Water Temperature Alarm will trigger if the
entering hot water temperature becomes too cold or becomes
out of range. The alarm will trigger if the entering hot water
temperature drops below the space temperature or hot water
temperature readings are out of range. This alarm will disable hot
water coil operation but will allow operation of the compressor
and supply fan. The alarm will release when the entering hot
water temperature rises above the space temperature. Acceptable
water temperature range is -10°F to 212°F.
CO
2
Override Alarm
The CO
2
Override Alarm will trigger if the space CO
2
level reads
above setpoint or becomes out of range. This alarm will allow
operation of all functions, and will output a signal through the
CO
2
Damper Override terminal. The alarm will release when the
CO
2
level drops below the setpoint minus deadband.
Emergency Shutdown Alarm
The Emergency Shutdown Input requires a constant connection to
24 VAC for normal operation. If the 24 VAC signal is removed,
then the controller will enter Emergency Shutdown Mode. This
alarm will disable the compressor and the supply fan. This alarm
will release when the 24 VAC input is restored.
WARNING: The Emergency Shutdown Alarm is not a
Fire/Life Safety Device.
High Supply Air Temperature (SAT) Cutoff
Alarm
the SAT is above 125°F for two minutes. The alarm will release
SEQUENCE OF OPERATION
Automatic Reset Alarms
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