Trenton Refrigeration Products Condensing Unit TEHA015L6

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

Select the method to measure suction pressure

Enter the suction pressure at the bulb location

Measure the temperature of the suction line at the thermostatic expansion valve bulb location

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

Calculate the actual superheat at the evaporator by subtracting the saturated temperature from the actual suction line temperature

Is the superheat within the range of 6 to 10 °F (3.4 to 5.6 °C) for systems with a 10 °F (5.6 °C) design TD?

Is the superheat within the range of 12 to 15 °F (6.7 to 8.4 °C) for systems with a higher operating TD?

Compressor Suction Superheat Measurement

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

Measure the suction temperature of the suction line about 6 inches (15 cm) back from the compressor suction valve using an accurate thermometer.

Calculate the actual superheat at the compressor

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

Describe any adjustments made to the suction superheat

System Capacity and Safety Notes

Review potential issues with incorrect superheat levels

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 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 after 12 hours. Is the system leak free?

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 tight.