Emerson 3000/ITR User Manual

The system refrigerant level must be checked periodically. To do so:
1. Adjust temperature setpoint in the unit so that the compressor will run continuously.
2. The refrigerant level is visible through two sight glasses on the receiver and will vary with 

ambient temperature. 
a. 40°F (4.4°C) and lower — Midway on the bottom sight glass. 
b. 40 to 60°F (4.4 to 15.6°C) — Bottom sight glass should be clear with liquid. 
c. 60°F (15.6°C) and above — Midway on the top sight glass.

3. Return temperature setpoint to desired number.

Each water- or glycol-cooled module has a coaxial condenser that consists of a steel outside tube and a 

copper inside tube.
Coaxial condensers do not normally require maintenance or replacement if the water supply is clean. 

If your system operates at high head pressure with reduced capacity, and all other causes have been 

eliminated, the coaxial condenser may be obstructed and needs to be replaced.