Keeprite Refrigiration Condensing Unit KMS220L6

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

Recheck the system for leaks after 12 hours

Enter the compressor discharge pressure

Enter the compressor suction pressure

Is the liquid line sight glass clear and expansion valve operating correctly?

Enter the oil level in the compressor sight glass

Is the thermostatic expansion valve set for proper superheat?

Enter the voltage reading at the compressor terminals

Enter the amperage reading at the compressor terminals

Is the high pressure control setting correct?

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

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.

Check that fan motors are operational.

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?