Coolant; Changing Coolant - BIRD Moduload 8640 Series Operation Manual

Moduload® RF Load Resistor
Figure 6 Measuring DC Resistance

Coolant

Ethylene glycol is toxic. Do not take internally. Avoid contact with eyes, skin, and
Use only distilled water or the supplied ethylene glycol as coolant. Do not use tap
water, automotive antifreeze, sealants, or leak stopping material. Use of these

Changing Coolant

Note: Follow these instructions to change the coolant.

To just add coolant, go to step 5.

To just drain the coolant, follow steps 1 – 4.
1. Get a clean container, with a capacity of 3 gal. (11 L), to hold the old coolant.
2. Remove the filler cap on top of the heat exchanger.
Note: This will allow the coolant to drain faster.
3. Unscrew and remove the drain plug on the rear of the load. Drain the coolant into the container.
Note: If the coolant has no contaminants it may be reused.
4. Replace the drain plug and screw it tightly into place.
5. Remove the filler cap on top of the heat exchanger.
6. Add about 3 quarts (2.9 L) of coolant.
7. Turn the unit on for a few seconds to draw coolant into the system.
8. Repeat steps 6 and 7 twice more, until the coolant remains steady at or just below the high mark on the level
gauge.
9. Replace the filler cap.
10. Turn the unit on and run it for five minutes to remove any air trapped in the system.
12
clothing. Avoid breathing vapor. Wash thoroughly after handling.
materials will damage the instrument and void all warranties.
Operation without sufficient coolant can damage the unit.
WARNING
CAUTION
CAUTION