Coolant; Adding Coolant - BIRD Moduload 8640 Series Operation Manual

Moduload® RF Load Resistor

Coolant

Avoid contact with eyes, skin, and clothing. Avoid breathing vapor. Wash thoroughly
Use only distilled water or ethylene glycol as coolant. Do not use tap water,
automotive antifreeze, sealants, or leak stopping material. Use of these materials will
Distilled water is the primary coolant for the Bird 8640. Ethylene glycol should be added to prevent bacterial growth
and freezing; 10% to 35% ethylene glycol is recommended. Using at least 10% will prevent bacterial growth and at
least 35% will protect against freezing to – 20°C.
Note: When using both ethylene glycol and distilled water, add the water first, then the ethylene gly-
col, to ensure proper mixing.
shows the coolant's freezing point for a given percentage of ethylene glycol in the mix. The
Figure 3 on page 7
following example shows the weights to make a 65% distilled water to 35% ethylene glycol mixture in 5 and 55
gallon quantities.
Distilled Water
Ethylene Glycol

Adding Coolant

The Bird 8640 Moduload has a coolant capacity of about 9 quarts (8.5 L). To fill the coolant reservoir, follow these
steps:
1. Ensure that the drain plug is in place.
2. Remove the filler cap on top of the heat exchanger.
3. Add about 3 quarts (2.9 L) of coolant.
4. Turn the unit on for a few seconds to draw coolant into the system.
5. Repeat steps 3 and 4 twice more, until the coolant remains steady at or just below the high mark on the level
gauge.
6. Replace the filler cap.
7. Turn the unit on and run it for five minutes to remove any air trapped in the system.
6
WARNING
Ethylene glycol is toxic. Do not take internally.
after handling.
CAUTION
damage the instrument and void all warranties.
5 Gal. (18.9 L)
28.0 lb (12.7 kg)
15.2 lb (6.9 kg)
CAUTION
Operation without sufficient coolant can damage the unit.
55 Gal. (208.2 L)
310 lb (140.6 kg)
167 lb (75.7 kg)