Trenton Refrigeration Products Condensing Unit TEHA006M8

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

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 and enter 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

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

Check that all electrical and refrigeration connections are tight

Check compressor crankcase oil level (if equipped with sight glass). It should be from 1/8 to 1/2 full in the 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 the high and low pressure controls, pressure regulating valves, oil pressure safety controls, Compressor Time Delay and any other safety controls are adjusted properly

Is the room thermostat set for normal operation? Adjust if required.

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

Check that fan motors are operational