Keeprite Refrigiration Condensing Unit KMS130L6

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

Pressurize the system to a maximum of 150 psig (1136 kPa) with dry nitrogen

Is the system free of major leaks?

Detailed Leak Testing for A1 Refrigerants

Discharge the initial dry nitrogen charge and add refrigerant to raise the system pressure up to 10 psig (170 kPa)

Add dry nitrogen to increase the system pressure to a maximum of 150 psig (1136 kPa)

Use an electronic leak detector to check for leaks

Hold the pressure for a minimum of 12 hours and recheck for leaks

Is the system leak free after 12 hours?

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 Considerations

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

Adjust the suction superheat if necessary

System Capacity and Safety Notes

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 contact point wear.

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

Check that all electrical and refrigeration connections are tight

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

Ensure compressor shipping spacers or hold down nut are properly in place

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

Ensure that all safety controls are adjusted properly

Is the room thermostat set for normal operation?

Check all motors, fans, and pump bearings in the condenser and evaporator