I/O Description
thermistor.
Run An internal N/O contact that is closed while the compressor is running. The speed at which the contact
closes is user-configurable via the monitor program. Circuit rated at 1A @ 30VDC/24VAC or 0.3A @
120VAC.
Analog Universal analog output manually controlled as a percentage of total voltage written through Modbus.
This can be configured for 0-5V or 0-10V via on board jumpers.
Entering Chilled Water
Temp
Analog input indicating water temperature. The temperature sensor must be an NTC type 10K @ 25°C
thermistor. Refer to the Service Manual for thermistor specification.
Leaving Chilled Water
Temp
Analog input indicating water temperature. The temperature sensor must be an NTC type 10K @ 25°C
thermistor. Refer to the Service Manual for thermistor specification.
Spare T +/- Optional input for monitoring temperature. The temperature sensor must be an NTC type 10K @ 25°C
thermistor.
Spare P +/- Can be connected to a 0-5V type pressure sensor.
Table 4-2 Jumper Details
Jumper Function and Setup
JP1 Determines the operating voltage range (0-5V or 0-10V) of the ANALOG output. If used, set the jumper to the
appropriate range.
JP2 Modbus termination jumper: install the jumper if Modbus is used and if the Modbus connection is at the end of a run.
ENTRY Install the jumper if there is no temperature sensor connected to the “Entering Chilled Water” analog input.
LEAVE Install the jumper if there is no temperature sensor connected to the “Leaving Chilled Water” analog input.
JP5/JP6 Jumpers J5 and J6 are used to match the characteristics of the liquid level sensors.
Voltage-type Level Sensor - If using a voltage-type sensor with 15V supply and 0-5V signal, install jumpers between
LVL pins 2a and 3a, and pins 2b and 3b. Connect the sensor leads to the +, S, and - terminals on the Interface module.
Consult vendor documentation for sensor lead identification.
Resistive-type Float Sensor - If using a resistive-type sensor, install jumpers between LVL pins 1a and 2a, and pins 1b
and 2b. Connect the sensor leads to the - and S terminals on the Interface module.
JP7 Supplies 5VDC to pin 1 on the 9-pin connector to power an optional Bluetooth adapter. Install if Bluetooth device is
being used in RS-232 connection (DB9).
*NO LONGER APPLIES*
4.1 Control Wiring Connection Guidelines
To ensure proper control wiring techniques, follow these guidelines:
1. The ground reference of the external circuit connected to the Compressor I/O Board must be at the
same potential as the ground reference on the Compressor I/O Board.
2. The Interlock circuit should be voltage-free. For instance, all external contractors/switches must not
introduce current into the circuit.
3. Analog outputs (such as Motor Speed) must be received by the external circuit without sending current
back to the Compressor I/O Board.
M-AP-001-EN Rev. S-9/8/2021 Page 37 of 136
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