Trenton Refrigeration Products Condensing Unit TEHA008M8

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

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?

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

Record the suction pressure at the bulb location

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

Saturated Temperature Conversion

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

Subtract the saturated temperature from the actual suction line temperature to find the superheat

Ensure a qualified refrigeration mechanic is present

Verify all installations are complete

Monitor compressor performance during the first operating cycle

Check performance of all moving components during the first operating cycle

Periodic Checks During First Day

Is the compressor operating within expected parameters?

Are all moving components functioning correctly?