Trenton Refrigeration Products Condensing Unit TEHA009M8

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 acceptable range for the system's design TD?

Verify the superheat range based on application

Ensure a qualified refrigeration mechanic is present

Verify all installations are complete

Start the compressor and observe performance

Monitor the following components during the first operating cycle

Periodic Checks During First Day

Is the compressor performance satisfactory?

Are all moving components functioning correctly?

Compressor Suction Superheat Measurement

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

Determine the saturated temperature corresponding to the measured pressure using a Pressure-Temperature chart.

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 by subtracting the saturated temperature from the actual suction line temperature.

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

If the superheat is not within the desired range, describe the adjustments made to the thermostatic expansion valve, liquid to suction heat exchanger, or suction line insulation.

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

Was the pressure held for a minimum of 12 hours and then rechecked?

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