Chapter 3 installation, Load resistor connection, Water line attachment – Bird Technologies 8750 Series User Manual

Page 15: Cooling water quality

Chapter 3

Installation

Load Resistor Connection

The compact design of the Models 8745/46 Termaline Load Resistor enables it

to be installed in very small spaces. It requires no ventilation and may be

placed at any attitude. Do not install it where the load may be subjected to

severe vibration or to physical shock.
The load is ready for connection as received from the factory. It is useful to

first check the 50 ohm input resistance of the load and record this data before

attachment (see “Maintenance” on page 9). Use the following procedure for RF

attachment.
1. Clean all conductor and insulator surfaces on the transmission line face

and, likewise, the RF input connector.

Note:

Use a dry cleaning solvent that does not leave a residue.

2. Attach the load resistor to the RF line.

Note:

Do not tighten the bolt and nut sets.

3. Use connector kits for respective models as follows:

a. Models 8755 - 3-1/8” EIA flanged, 50 ohm:

Use a 3-1/8 inch EIA coupling kit (Bird P/N 4600-020) which

includes six 3/8-16 x 1-1/2 inch bolt and nut sets, O-Ring, and

anchor bullet (center conductor).

b. Models 8756 - 3-1/8” unflanged, 50 ohm flush center conductor:

Use Bird coupling kit P/N 5-726 (RCA MI-27791K-4A) consisting of an

outer sleeve with two clamping bands and the center conductor cou-

pling bullet.

4. Rotate the load so that the warning label shows and the outlet water tube

is placed to the best advantage.

5. Secure the clamps or bolt set firmly and evenly around the RF connection.

Note:

Do not disturb the socket head cap screws that join the con-

nector section to the main housing.

Water Line Attachment

The RF Load comes supplied with standard 3/4 inch hose fittings for attaching

the water supply and drain lines. The water INLET, at the back on center and

water OUTLET, adjacent at 90°to the inlet, mate with 3/4 inch water hose con-

nectors. If the unit is supplied with the optional control system, the water flow

for alternate field installation. To connect to a rigid piping connection, replace

the water inlet and outlet hose adapters, Bird P/N 5-065-2, with ½ inch male

pipe or pipe fittings. Take special care when connecting the water lines. The

inside of the load is designed so that the water flows properly in only one direc-

tion - from the inlet to the outlet. The water flow must be kept in the proper

direction - opposite flow will cause resistor failure when power is applied.

Cooling Water Quality

explanation and description. In general, any potable water is satisfactory.

This would include purified, filtered, city supply, or soft water.