Emerson Fluid Chiller User Manual

The temperature setpoint for the chiller should be set by turning the potentiometer. To obtain an 

accurate setpoint, connect a voltmeter (millivolt) to TP1 and TP2. The readout will display tem-

perature in degrees Fahrenheit. Turn the potentiometer to the desired setpoint.
A “well” sensor is factory-piped and wired to accurately measure the temperature of the water 

leaving the chiller. This sensor provides input to the Electronic Hot Gas Bypass Controller. The 

sensor changes electrical resistance in response to temperature changes. To check or troubleshoot 

the sensor, disconnect it from the controller and measure the resistance. Figure 3E shows the 

relationship between temperature and resistance.

A circuit setter is factory-installed in the supply line and a ball valve is factory-installed in a 

bypass loop. The desired system flow to the load should be set by adjusting the circuit setter to the 

required flow rate. If a flow rate of less than 5 gpm is required, the ball valve should be adjusted 

to keep the overall system flow rate up. If low suction pressures are present, the circuit setter 

should be set to a higher flow, with the bypass valve used to control flow to the load.

Maintenance

18E