Bird Technologies 8640B Series - Manual (Page 19)

Bird 8640 Series Moduload RF Load Resistor
8
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. Make sure 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 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.
CAUTION
Operation without sufficient coolant can damage the unit.
Figure 3
Freezing Point of
Ethylene Glycol /
Distilled Water
Mixture
-60
-50
-40
-30
-20
-10
0
T
e
mperat
ure
, Degree
s
Ce
lsius
10 20 30 40 50 60
% Ethylene Glycol
Specifications for ethylene glycol
having: specific gravity 1.125 @
32°F; specific heat .575 @ 68°F