Trimming refrigerant charge, Initial start-up, Preparation – Carrier 19XL User Manual

Page 169

Trimming Refrigerant Charge

The 19XL is shipped with the correct charge for the design duty of the machine. Trimming the

charge can be best accomplished when design load is available. To trim, check the temperature

difference between leaving chilled water temperature and cooler refrigerant temperature at full

load design conditions. If necessary, add or remove refrigerant to bring the temperature

difference to design conditions or minimum differential.

Initial Start-up

Preparation

Before starting the machine, check that the:

1. Power is on to the main starter, oil pump relay, tower fan starter, oil heater relay, and the

machine control center.

2. Cooling tower water is at proper level, and at or below design entering temperature.

3. Machine is charged with refrigerant and all refrigerant and oil valves are in their proper

operating position.

4. Oil is at the proper level in the reservoir sight glasses.