Trenton Refrigeration Products Condensing Unit TEHA025L6

Enter the compressor discharge pressure

Enter the compressor suction pressure

Are the pressures within the allowable design limits?

Check the liquid line sight glass for refrigerant level

Check the expansion valve operation

Is there an indication of low refrigerant?

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?

Verify all connections are tight

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

Ensure proper installation of compressor components

Ensure compressor discharge and suction shut-off valves are open

Ensure all pressure and safety controls are adjusted properly

Is the room thermostat set for normal operation?

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 after 12 hours. Is the system leak free?

Disconnect and lock off the main power supply

Check electrical components and tighten any loose connections

Check all wiring and electrical insulators

Check contactors for proper operation and contact point wear