4
Chapter 3
Installation
The compact design of the Model 8792 Termaline Load Resistors enable them to be installed in very small spaces.
They require no ventilation and may be placed at any attitude. Do not install them where they 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
"RF Assembly Resistance Test" on page 9
Load Resistor Connection
Use the following procedure for RF attachment.
Note:
Use alcohol, freon, or any acceptable dry cleaning solvent on a cloth or cotton swab stick.
1.
Clean all conductor and insulator surfaces on the transmission line face and, likewise, the RF input connector.
Note:
Do not tighten the bolt and nut sets.
2.
Attach the load resistor to the RF line.
Use 6-1/8 inch EIA coupling kit, Bird P/N 4902-020, which includes 12 3/8-16 x 1-3/4 inch bolts, lockwashers,
and nut sets, O-Ring, and anchor bullet (center conductor).
3.
Rotate the load so that the warning label shows and the outlet water tube is placed to the best advantage.
4.
Tighten the RF connection by securing the clamps or bolt sets firmly and evenly.
Note:
Do not disturb the socket head cap screws that join the connector section to the main housing.
5.
Install water inlet and outlet connections. See
"Water Line Attachment" on page 4
.
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 a 90 degree angle to the inlet, mate with 3/4 inch
water hose connectors.
If the unit is factory equipped with the optional control system, the water flow switch is installed on the water inlet
line.
For field installation of the optional control system see
To connect to rigid piping, replace the water inlet and outlet hose adapters with 1/2 inch male pipe or pipe fittings,
Bird P/N 5-065-2. Take special care when connecting the water lines. The inside of the load is designed so that the
water flows properly in only one direction - 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
Water quality is important. See
"Cooling Water Quality" on page 4
for an explanation and description. In general,
most potable water is satisfactory. This would include purified, filtered, city supply, or soft water.
CAUTION
The water flow must be kept in the proper direction; incorrect flow will cause almost
immediate burnout.
