Keeprite Refrigiration Condensing Unit KMS075M9

Compressor Superheat Measurement

Measure the suction pressure at the suction service valve of the compressor

Determine the saturated temperature from the Pressure-Temperature chart

Measure the suction temperature of the suction line

Calculate the actual superheat at the compressor

System Balancing and Adjustment

Is the superheat within the range of 20 to 45 °F (11.2 to 25.2 °C)?

Describe any adjustments made to the suction superheat

Disconnect and lock off the main power supply to avoid accidental start-up of the equipment.

Check electrical components and tighten any loose connections.

Check all wiring and electrical insulators.

Check contactors for proper operation and inspect contact points for wear.

Ensure fan blades are tight and all mounting bolts are secure.

Verify all connections are tight

Check compressor crankcase oil level (if equipped with sight glass)

Ensure compressor mounting is secure

Check that compressor discharge and suction shut-off valves are open

Ensure all pressure and safety controls are adjusted properly

Check room thermostat setting and adjust if required

Measure the suction pressure in the suction line at the bulb location using a gauge in the external equalizer line or directly in the suction line.

Measure the temperature of the suction line at the point where the thermostatic expansion valve bulb is clamped.

Temperature Conversion and Calculation

Convert the measured suction pressure to a saturated evaporator temperature using a Pressure-Temperature chart.

Subtract the saturated temperature from the actual suction line temperature to find the superheat at the evaporator.

Is the superheat within the recommended range for the system's design TD?

Enter the compressor discharge pressure

Enter the compressor suction pressure

Are the compressor pressures within allowable design limits?

Check the liquid line sight glass and expansion valve operation

Is the system low on refrigerant?

Check the level of oil in the compressor sight glass

Add oil to the compressor if necessary

Check thermostatic expansion valve for proper superheat settings