Maintenance

Recovery and Recycle

Connections

To facilitate refrigerant removal and replacement, newer-design CDHF, CDHG units are provided with a 3/4- inch vapor fitting with shutoff valve on the chiller suction and with a 3/4- inch liquid connection with shutoff valve at the bottom of the evaporator shell. (Refer to Refrigerant Handling Guidelines)

Leak Testing

To leak-test a chiller containing full refrigerant charge, raise chiller pressure using a controlled hot water or electric-resistance system to a maximum of 8 psig. Do not use nitrogen, which will cause excessive refrigerant discharge by the purge system.

Cleaning the Condenser

CAUTION

Proper Water Treatment!

The use of untreated or improperly treated water in a CenTraVac may result in scaling, erosion, corrosion, algae or slime. It is recommended that the services of a qualified water treatment specialist be engaged to determine what water treatment, if any, is required. Trane assumes no responsibility for equipment failures which result from untreated or improperly treated water, or saline or brackish water.

See Figure 38 which shows a Typical Chemical Cleaning Setup.

Figure 38. Typical chemical cleaning setup

100

CDHF-SVU01C-EN

Page 100
Image 100
American Standard CH530 Proper Water Treatment, Recovery and Recycle Connections, Leak Testing, Cleaning the Condenser