Keeprite Refrigiration Condensing Unit KMS090L6

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 acceptable range for the system's design TD?

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 to ensure proper operation and contact point for wear.

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

Verify all electrical and refrigeration connections are tight

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

Are compressor shipping spacers or hold down nuts properly in place?

Are compressor discharge and suction shut-off valves open?

Are all pressure controls and safety controls adjusted properly?

Is the room thermostat set for normal operation?

Enter the compressor discharge pressure

Enter the compressor suction pressure

Are the pressures within the allowable design limits?

Check the liquid line sight glass and expansion valve operation

Is there an indication that the system is low on refrigerant?

Describe any leaks found in the system