1-14
Pioneer Gold 3.00 Controller Technical Guide
INPUTS AND OUTPUTS
Controller Input and Output Descriptions
COF - Condensate Overow 1
alarm will be generated any time the resistance between this
input and ground is less than 100K ohm. This Alarm disables the
compressor outputs as well as the main fan. This is a dry input
(contact closure to COM).
LLT - Liquid Line Temperature
This is a 10k ohm Type III thermistor input. It is the temperature
of the refrigerant liquid line. If the Liquid Line Temperature
(LLT) drops to a dangerous level, the Liquid Line Temperature
Alarm will be generated and the compressors will be disabled.
When the LLT rises above the safe limit again, this alarm will
be reset. The temperatures for triggering and clearing this alarm
are based on the glycol % programmed into the board. See Table
1-14, page 1-32.
UI1 - Leaving Water Temperature
This is a 10k ohm Type III thermistor input. It is the temperature
of the leaving water. If the Leaving Water Temperature (LWT)
drops to a dangerous level, the Low Leaving Water Temperature
Alarm will be generated and the compressors will be disabled.
When the LWT rises above the safe limit again, this alarm will
be reset. The temperatures for triggering and clearing this alarm
are based on the glycol % programmed into the board. See Table
1-10, page 1-36.
ECT - Evaporator Coil Temperature
This is a 10k ohm Type III thermistor input. It is the temperature
of the Suction Line. If the Suction Line Temperature drops
below 30ºF, a Low Evaporator Coil Temperature Alarm will be
generated. The compressors will be disabled and the fan will
remain energized. The alarm will clear when the Suction Line
Temperature rises above 45ºF
DI1 and DI2 - Compressor Interlock 1 and 2
These inputs provide generic status and alarms that can be used
switches, or water valve end switches. The compressor will not
be allowed to start until the input is energized. Once running,
the compressor will be disabled if the input is de-energized.
The compressor interlock option must be enabled using the
are status-only.
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